/[cvs]/ccvs/lib/regex.c
ViewVC logotype

Diff of /ccvs/lib/regex.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 1.19 by dprice, Mon May 23 17:44:32 2005 UTC revision 1.20 by dprice, Fri Aug 12 20:58:10 2005 UTC
# Line 1  Line 1 
1  /* Extended regular expression matching and search library,  /* Extended regular expression matching and search library.
2     version 0.12.     Copyright (C) 2002, 2003 Free Software Foundation, Inc.
3     (Implements POSIX draft P1003.2/D11.2, except for some of the     This file is part of the GNU C Library.
4     internationalization features.)     Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
   
    Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,  
    2002, 2003, 2004, 2005 Free Software Foundation, Inc.  
5    
6     This program is free software; you can redistribute it and/or modify     This program is free software; you can redistribute it and/or modify
7     it under the terms of the GNU General Public License as published by     it under the terms of the GNU General Public License as published by
# Line 18  Line 15 
15    
16     You should have received a copy of the GNU General Public License along     You should have received a copy of the GNU General Public License along
17     with this program; if not, write to the Free Software Foundation,     with this program; if not, write to the Free Software Foundation,
18     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
   
 /* AIX requires this to be the first thing in the file. */  
 #if defined _AIX && !defined REGEX_MALLOC  
   #pragma alloca  
 #endif  
   
 #undef  _GNU_SOURCE  
 #define _GNU_SOURCE  
19    
20  #ifdef HAVE_CONFIG_H  #ifdef HAVE_CONFIG_H
21  # include <config.h>  #include "config.h"
22  #endif  #endif
23    
24  #ifndef INSIDE_RECURSION  #ifdef _AIX
25    #pragma alloca
26  # include <stddef.h>  #else
27    # ifndef allocax           /* predefined by HP cc +Olibcalls */
28  # define WIDE_CHAR_SUPPORT (HAVE_WCTYPE_H && HAVE_WCHAR_H && HAVE_BTOWC)  #  ifdef __GNUC__
29    #   define alloca(size) __builtin_alloca (size)
30  /* For platform which support the ISO C amendement 1 functionality we  #  else
31     support user defined character classes.  */  #   if HAVE_ALLOCA_H
32  # if defined _LIBC || WIDE_CHAR_SUPPORT  #    include <alloca.h>
33  /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included  #   else
34     before <wchar.h>. */  #    ifdef __hpux
35  #  include <stdio.h>          void *alloca ();
36  /* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>.  */  #    else
37  #  include <wchar.h>  #     if !defined __OS2__ && !defined WIN32
38  #  include <wctype.h>          char *alloca ();
39    #     else
40    #      include <malloc.h>       /* OS/2 defines alloca in here */
41    #     endif
42    #    endif
43    #   endif
44    #  endif
45  # endif  # endif
46    #endif
47    
48  # ifdef _LIBC  #ifdef _LIBC
49  /* We have to keep the namespace clean.  */  /* We have to keep the namespace clean.  */
50  #  define regfree(preg) __regfree (preg)  # define regfree(preg) __regfree (preg)
51  #  define regexec(pr, st, nm, pm, ef) __regexec (pr, st, nm, pm, ef)  # define regexec(pr, st, nm, pm, ef) __regexec (pr, st, nm, pm, ef)
52  #  define regcomp(preg, pattern, cflags) __regcomp (preg, pattern, cflags)  # define regcomp(preg, pattern, cflags) __regcomp (preg, pattern, cflags)
53  #  define regerror(errcode, preg, errbuf, errbuf_size) \  # define regerror(errcode, preg, errbuf, errbuf_size) \
54          __regerror(errcode, preg, errbuf, errbuf_size)          __regerror(errcode, preg, errbuf, errbuf_size)
55  #  define re_set_registers(bu, re, nu, st, en) \  # define re_set_registers(bu, re, nu, st, en) \
56          __re_set_registers (bu, re, nu, st, en)          __re_set_registers (bu, re, nu, st, en)
57  #  define re_match_2(bufp, string1, size1, string2, size2, pos, regs, stop) \  # define re_match_2(bufp, string1, size1, string2, size2, pos, regs, stop) \
58          __re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop)          __re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop)
59  #  define re_match(bufp, string, size, pos, regs) \  # define re_match(bufp, string, size, pos, regs) \
60          __re_match (bufp, string, size, pos, regs)          __re_match (bufp, string, size, pos, regs)
61  #  define re_search(bufp, string, size, startpos, range, regs) \  # define re_search(bufp, string, size, startpos, range, regs) \
62          __re_search (bufp, string, size, startpos, range, regs)          __re_search (bufp, string, size, startpos, range, regs)
63  #  define re_compile_pattern(pattern, length, bufp) \  # define re_compile_pattern(pattern, length, bufp) \
64          __re_compile_pattern (pattern, length, bufp)          __re_compile_pattern (pattern, length, bufp)
65  #  define re_set_syntax(syntax) __re_set_syntax (syntax)  # define re_set_syntax(syntax) __re_set_syntax (syntax)
66  #  define re_search_2(bufp, st1, s1, st2, s2, startpos, range, regs, stop) \  # define re_search_2(bufp, st1, s1, st2, s2, startpos, range, regs, stop) \
67          __re_search_2 (bufp, st1, s1, st2, s2, startpos, range, regs, stop)          __re_search_2 (bufp, st1, s1, st2, s2, startpos, range, regs, stop)
68  #  define re_compile_fastmap(bufp) __re_compile_fastmap (bufp)  # define re_compile_fastmap(bufp) __re_compile_fastmap (bufp)
   
 #  define btowc __btowc  
 #  define iswctype __iswctype  
 #  define mbrtowc __mbrtowc  
 #  define wcslen __wcslen  
 #  define wcscoll __wcscoll  
 #  define wcrtomb __wcrtomb  
   
 /* We are also using some library internals.  */  
 #  include <locale/localeinfo.h>  
 #  include <locale/elem-hash.h>  
 #  include <langinfo.h>  
 #  include <locale/coll-lookup.h>  
 # endif  
   
 # ifdef _LIBC  
 #  include <libintl.h>  
 #  undef gettext  
 #  define gettext(msgid) __dcgettext ("libc", msgid, LC_MESSAGES)  
    /* This define is so xgettext can find the internationalizable strings.  */  
 #  define gettext_noop(msgid) msgid  
 # else  
 /* This is for other GNU distributions with internationalized messages.  */  
 #  include "gettext.h"  
 # endif  
   
 /* Support for bounded pointers.  */  
 # if !defined _LIBC && !defined __BOUNDED_POINTERS__  
 #  define __bounded     /* nothing */  
 #  define __unbounded   /* nothing */  
 #  define __ptrvalue    /* nothing */  
 # endif  
   
 /* The `emacs' switch turns on certain matching commands  
    that make sense only in Emacs. */  
 # ifdef emacs  
   
 #  include "lisp.h"  
 #  include "buffer.h"  
 #  include "syntax.h"  
   
 # else  /* not emacs */  
   
 /* If we are not linking with Emacs proper,  
    we can't use the relocating allocator  
    even if config.h says that we can.  */  
 #  undef REL_ALLOC  
   
 #  include <stdlib.h>  
   
 /* When used in Emacs's lib-src, we need to get bzero and bcopy somehow.  
    If nothing else has been done, use the method below.  */  
 #  ifdef INHIBIT_STRING_HEADER  
 #   if !(defined HAVE_BZERO && defined HAVE_BCOPY)  
 #    if !defined bzero && !defined bcopy  
 #     undef INHIBIT_STRING_HEADER  
 #    endif  
 #   endif  
 #  endif  
   
 /* This is the normal way of making sure we have a bcopy and a bzero.  
    This is used in most programs--a few other programs avoid this  
    by defining INHIBIT_STRING_HEADER.  */  
 #  ifndef INHIBIT_STRING_HEADER  
 #   include <string.h>  
 #   ifndef bzero  
 #    ifndef _LIBC  
 #     define bzero(s, n)        (memset (s, '\0', n), (s))  
 #    else  
 #     define bzero(s, n)        __bzero (s, n)  
 #    endif  
 #   endif  
 #  endif  
   
 /* Define the syntax stuff for \<, \>, etc.  */  
   
 /* This must be nonzero for the wordchar and notwordchar pattern  
    commands in re_match_2.  */  
 #  ifndef Sword  
 #   define Sword 1  
 #  endif  
   
 #  ifdef SWITCH_ENUM_BUG  
 #   define SWITCH_ENUM_CAST(x) ((int)(x))  
 #  else  
 #   define SWITCH_ENUM_CAST(x) (x)  
 #  endif  
   
 # endif /* not emacs */  
   
 # include <limits.h>  
   
 # ifndef MB_LEN_MAX  
 #  define MB_LEN_MAX 1  
 # endif  
   
 /* Get the interface, including the syntax bits.  */  
 # include <regex.h>  
   
 /* isalpha etc. are used for the character classes.  */  
 # include <ctype.h>  
   
 /* Jim Meyering writes:  
   
    "... Some ctype macros are valid only for character codes that  
    isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when  
    using /bin/cc or gcc but without giving an ansi option).  So, all  
    ctype uses should be through macros like ISPRINT...  If  
    STDC_HEADERS is defined, then autoconf has verified that the ctype  
    macros don't need to be guarded with references to isascii. ...  
    Defining isascii to 1 should let any compiler worth its salt  
    eliminate the && through constant folding."  
    Solaris defines some of these symbols so we must undefine them first.  */  
   
 # if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)  
 #  define IN_CTYPE_DOMAIN(c) 1  
 # else  
 #  define IN_CTYPE_DOMAIN(c) isascii(c)  
 # endif  
   
 # ifdef isblank  
 #  define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank (c))  
 # else  
 #  define ISBLANK(c) ((c) == ' ' || (c) == '\t')  
 # endif  
 # ifdef isgraph  
 #  define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isgraph (c))  
 # else  
 #  define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isprint (c) && !isspace (c))  
 # endif  
   
 # undef ISPRINT  
 # define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))  
 # define ISDIGIT(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))  
 # define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum (c))  
 # define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))  
 # define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))  
 # define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))  
 # define ISPUNCT(c) (IN_CTYPE_DOMAIN (c) && ispunct (c))  
 # define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))  
 # define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))  
 # define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (c))  
   
 # ifdef _tolower  
 #  define TOLOWER(c) _tolower(c)  
 # else  
 #  define TOLOWER(c) tolower(c)  
 # endif  
   
 # ifndef emacs  
 /* How many characters in the character set.  */  
 #  define CHAR_SET_SIZE 256  
   
 #  ifdef SYNTAX_TABLE  
   
 extern char *re_syntax_table;  
   
 #  else /* not SYNTAX_TABLE */  
   
 static char re_syntax_table[CHAR_SET_SIZE];  
   
 static void  
 init_syntax_once (void)  
 {  
    register int c;  
    static int done = 0;  
   
    if (done)  
      return;  
    bzero (re_syntax_table, sizeof re_syntax_table);  
   
    for (c = 0; c < CHAR_SET_SIZE; ++c)  
      if (ISALNUM (c))  
         re_syntax_table[c] = Sword;  
   
    re_syntax_table['_'] = Sword;  
   
    done = 1;  
 }  
   
 #  endif /* not SYNTAX_TABLE */  
   
 #  define SYNTAX(c) re_syntax_table[(unsigned char) (c)]  
   
 # endif /* emacs */  
   
 /* Should we use malloc or alloca?  If REGEX_MALLOC is not defined, we  
    use `alloca' instead of `malloc'.  This is because using malloc in  
    re_search* or re_match* could cause memory leaks when C-g is used in  
    Emacs; also, malloc is slower and causes storage fragmentation.  On  
    the other hand, malloc is more portable, and easier to debug.  
   
    Because we sometimes use alloca, some routines have to be macros,  
    not functions -- `alloca'-allocated space disappears at the end of the  
    function it is called in.  */  
   
 # ifdef REGEX_MALLOC  
   
 #  define REGEX_ALLOCATE malloc  
 #  define REGEX_REALLOCATE(source, osize, nsize) realloc (source, nsize)  
 #  define REGEX_FREE free  
   
 # else /* not REGEX_MALLOC  */  
   
 /* Emacs already defines alloca, sometimes.  */  
 #  ifndef alloca  
   
 /* Make alloca work the best possible way.  */  
 #   include <alloca.h>  
   
 #  endif /* not alloca */  
   
 #  define REGEX_ALLOCATE alloca  
   
 /* Assumes a `char *destination' variable.  */  
 #  define REGEX_REALLOCATE(source, osize, nsize)                        \  
   (destination = (char *) alloca (nsize),                               \  
    memcpy (destination, source, osize))  
   
 /* No need to do anything to free, after alloca.  */  
 #  define REGEX_FREE(arg) ((void)0) /* Do nothing!  But inhibit gcc warning.  */  
   
 # endif /* not REGEX_MALLOC */  
   
 /* Define how to allocate the failure stack.  */  
   
 # if defined REL_ALLOC && defined REGEX_MALLOC  
   
 #  define REGEX_ALLOCATE_STACK(size)                            \  
   r_alloc (&failure_stack_ptr, (size))  
 #  define REGEX_REALLOCATE_STACK(source, osize, nsize)          \  
   r_re_alloc (&failure_stack_ptr, (nsize))  
 #  define REGEX_FREE_STACK(ptr)                                 \  
   r_alloc_free (&failure_stack_ptr)  
   
 # else /* not using relocating allocator */  
   
 #  ifdef REGEX_MALLOC  
   
 #   define REGEX_ALLOCATE_STACK malloc  
 #   define REGEX_REALLOCATE_STACK(source, osize, nsize) realloc (source, nsize)  
 #   define REGEX_FREE_STACK free  
   
 #  else /* not REGEX_MALLOC */  
   
 #   define REGEX_ALLOCATE_STACK alloca  
69    
70  #   define REGEX_REALLOCATE_STACK(source, osize, nsize)                 \  # include "../locale/localeinfo.h"
    REGEX_REALLOCATE (source, osize, nsize)  
 /* No need to explicitly free anything.  */  
 #   define REGEX_FREE_STACK(arg)  
   
 #  endif /* not REGEX_MALLOC */  
 # endif /* not using relocating allocator */  
   
   
 /* True if `size1' is non-NULL and PTR is pointing anywhere inside  
    `string1' or just past its end.  This works if PTR is NULL, which is  
    a good thing.  */  
 # define FIRST_STRING_P(ptr)                                    \  
   (size1 && string1 <= (ptr) && (ptr) <= string1 + size1)  
   
 /* (Re)Allocate N items of type T using malloc, or fail.  */  
 # define TALLOC(n, t) ((t *) malloc ((n) * sizeof (t)))  
 # define RETALLOC(addr, n, t) ((addr) = (t *) realloc (addr, (n) * sizeof (t)))  
 # define RETALLOC_IF(addr, n, t) \  
   if (addr) RETALLOC((addr), (n), t); else (addr) = TALLOC ((n), t)  
 # define REGEX_TALLOC(n, t) ((t *) REGEX_ALLOCATE ((n) * sizeof (t)))  
   
 # define BYTEWIDTH 8 /* In bits.  */  
   
 # define STREQ(s1, s2) ((strcmp (s1, s2) == 0))  
   
 # undef MAX  
 # undef MIN  
 # define MAX(a, b) ((a) > (b) ? (a) : (b))  
 # define MIN(a, b) ((a) < (b) ? (a) : (b))  
   
 typedef char boolean;  
 # define false 0  
 # define true 1  
   
 static reg_errcode_t byte_regex_compile (const char *pattern, size_t size,  
                                          reg_syntax_t syntax,  
                                          struct re_pattern_buffer *bufp);  
   
 static int byte_re_match_2_internal (struct re_pattern_buffer *bufp,  
                                      const char *string1, int size1,  
                                      const char *string2, int size2,  
                                      int pos,  
                                      struct re_registers *regs,  
                                      int stop);  
 static int byte_re_search_2 (struct re_pattern_buffer *bufp,  
                              const char *string1, int size1,  
                              const char *string2, int size2,  
                              int startpos, int range,  
                              struct re_registers *regs, int stop);  
 static int byte_re_compile_fastmap (struct re_pattern_buffer *bufp);  
   
 #ifdef MBS_SUPPORT  
 static reg_errcode_t wcs_regex_compile (const char *pattern, size_t size,  
                                         reg_syntax_t syntax,  
                                         struct re_pattern_buffer *bufp);  
   
   
 static int wcs_re_match_2_internal (struct re_pattern_buffer *bufp,  
                                     const char *cstring1, int csize1,  
                                     const char *cstring2, int csize2,  
                                     int pos,  
                                     struct re_registers *regs,  
                                     int stop,  
                                     wchar_t *string1, int size1,  
                                     wchar_t *string2, int size2,  
                                     int *mbs_offset1, int *mbs_offset2);  
 static int wcs_re_search_2 (struct re_pattern_buffer *bufp,  
                             const char *string1, int size1,  
                             const char *string2, int size2,  
                             int startpos, int range,  
                             struct re_registers *regs, int stop);  
 static int wcs_re_compile_fastmap (struct re_pattern_buffer *bufp);  
 #endif  
   
 /* These are the command codes that appear in compiled regular  
    expressions.  Some opcodes are followed by argument bytes.  A  
    command code can specify any interpretation whatsoever for its  
    arguments.  Zero bytes may appear in the compiled regular expression.  */  
   
 typedef enum  
 {  
   no_op = 0,  
   
   /* Succeed right away--no more backtracking.  */  
   succeed,  
   
         /* Followed by one byte giving n, then by n literal bytes.  */  
   exactn,  
   
 # ifdef MBS_SUPPORT  
         /* Same as exactn, but contains binary data.  */  
   exactn_bin,  
 # endif  
   
         /* Matches any (more or less) character.  */  
   anychar,  
   
         /* Matches any one char belonging to specified set.  First  
            following byte is number of bitmap bytes.  Then come bytes  
            for a bitmap saying which chars are in.  Bits in each byte  
            are ordered low-bit-first.  A character is in the set if its  
            bit is 1.  A character too large to have a bit in the map is  
            automatically not in the set.  */  
         /* ifdef MBS_SUPPORT, following element is length of character  
            classes, length of collating symbols, length of equivalence  
            classes, length of character ranges, and length of characters.  
            Next, character class element, collating symbols elements,  
            equivalence class elements, range elements, and character  
            elements follow.  
            See regex_compile function.  */  
   charset,  
   
         /* Same parameters as charset, but match any character that is  
            not one of those specified.  */  
   charset_not,  
   
         /* Start remembering the text that is matched, for storing in a  
            register.  Followed by one byte with the register number, in  
            the range 0 to one less than the pattern buffer's re_nsub  
            field.  Then followed by one byte with the number of groups  
            inner to this one.  (This last has to be part of the  
            start_memory only because we need it in the on_failure_jump  
            of re_match_2.)  */  
   start_memory,  
   
         /* Stop remembering the text that is matched and store it in a  
            memory register.  Followed by one byte with the register  
            number, in the range 0 to one less than `re_nsub' in the  
            pattern buffer, and one byte with the number of inner groups,  
            just like `start_memory'.  (We need the number of inner  
            groups here because we don't have any easy way of finding the  
            corresponding start_memory when we're at a stop_memory.)  */  
   stop_memory,  
   
         /* Match a duplicate of something remembered. Followed by one  
            byte containing the register number.  */  
   duplicate,  
   
         /* Fail unless at beginning of line.  */  
   begline,  
   
         /* Fail unless at end of line.  */  
   endline,  
   
         /* Succeeds if at beginning of buffer (if emacs) or at beginning  
            of string to be matched (if not).  */  
   begbuf,  
   
         /* Analogously, for end of buffer/string.  */  
   endbuf,  
   
         /* Followed by two byte relative address to which to jump.  */  
   jump,  
   
         /* Same as jump, but marks the end of an alternative.  */  
   jump_past_alt,  
   
         /* Followed by two-byte relative address of place to resume at  
            in case of failure.  */  
         /* ifdef MBS_SUPPORT, the size of address is 1.  */  
   on_failure_jump,  
   
         /* Like on_failure_jump, but pushes a placeholder instead of the  
            current string position when executed.  */  
   on_failure_keep_string_jump,  
   
         /* Throw away latest failure point and then jump to following  
            two-byte relative address.  */  
         /* ifdef MBS_SUPPORT, the size of address is 1.  */  
   pop_failure_jump,  
   
         /* Change to pop_failure_jump if know won't have to backtrack to  
            match; otherwise change to jump.  This is used to jump  
            back to the beginning of a repeat.  If what follows this jump  
            clearly won't match what the repeat does, such that we can be  
            sure that there is no use backtracking out of repetitions  
            already matched, then we change it to a pop_failure_jump.  
            Followed by two-byte address.  */  
         /* ifdef MBS_SUPPORT, the size of address is 1.  */  
   maybe_pop_jump,  
   
         /* Jump to following two-byte address, and push a dummy failure  
            point. This failure point will be thrown away if an attempt  
            is made to use it for a failure.  A `+' construct makes this  
            before the first repeat.  Also used as an intermediary kind  
            of jump when compiling an alternative.  */  
         /* ifdef MBS_SUPPORT, the size of address is 1.  */  
   dummy_failure_jump,  
   
         /* Push a dummy failure point and continue.  Used at the end of  
            alternatives.  */  
   push_dummy_failure,  
   
         /* Followed by two-byte relative address and two-byte number n.  
            After matching N times, jump to the address upon failure.  */  
         /* ifdef MBS_SUPPORT, the size of address is 1.  */  
   succeed_n,  
   
         /* Followed by two-byte relative address, and two-byte number n.  
            Jump to the address N times, then fail.  */  
         /* ifdef MBS_SUPPORT, the size of address is 1.  */  
   jump_n,  
   
         /* Set the following two-byte relative address to the  
            subsequent two-byte number.  The address *includes* the two  
            bytes of number.  */  
         /* ifdef MBS_SUPPORT, the size of address is 1.  */  
   set_number_at,  
   
   wordchar,     /* Matches any word-constituent character.  */  
   notwordchar,  /* Matches any char that is not a word-constituent.  */  
   
   wordbeg,      /* Succeeds if at word beginning.  */  
   wordend,      /* Succeeds if at word end.  */  
   
   wordbound,    /* Succeeds if at a word boundary.  */  
   notwordbound  /* Succeeds if not at a word boundary.  */  
   
 # ifdef emacs  
   ,before_dot,  /* Succeeds if before point.  */  
   at_dot,       /* Succeeds if at point.  */  
   after_dot,    /* Succeeds if after point.  */  
   
         /* Matches any character whose syntax is specified.  Followed by  
            a byte which contains a syntax code, e.g., Sword.  */  
   syntaxspec,  
   
         /* Matches any character whose syntax is not that specified.  */  
   notsyntaxspec  
 # endif /* emacs */  
 } re_opcode_t;  
 #endif /* not INSIDE_RECURSION */  
   
   
 #ifdef BYTE  
 # define CHAR_T char  
 # define UCHAR_T unsigned char  
 # define COMPILED_BUFFER_VAR bufp->buffer  
 # define OFFSET_ADDRESS_SIZE 2  
 # define PREFIX(name) byte_##name  
 # define ARG_PREFIX(name) name  
 # define PUT_CHAR(c) putchar (c)  
 #else  
 # ifdef WCHAR  
 #  define CHAR_T wchar_t  
 #  define UCHAR_T wchar_t  
 #  define COMPILED_BUFFER_VAR wc_buffer  
 #  define OFFSET_ADDRESS_SIZE 1 /* the size which STORE_NUMBER macro use */  
 #  define CHAR_CLASS_SIZE ((__alignof__(wctype_t)+sizeof(wctype_t))/sizeof(CHAR_T)+1)  
 #  define PREFIX(name) wcs_##name  
 #  define ARG_PREFIX(name) c##name  
 /* Should we use wide stream??  */  
 #  define PUT_CHAR(c) printf ("%C", c);  
 #  define TRUE 1  
 #  define FALSE 0  
 # else  
 #  ifdef MBS_SUPPORT  
 #   define WCHAR  
 #   define INSIDE_RECURSION  
 #   include "regex.c"  
 #   undef INSIDE_RECURSION  
 #  endif  
 #  define BYTE  
 #  define INSIDE_RECURSION  
 #  include "regex.c"  
 #  undef INSIDE_RECURSION  
 # endif  
71  #endif  #endif
72    
73  #if USE_UNLOCKED_IO  /* POSIX says that <sys/types.h> must be included (by the caller) before
74  # include "unlocked-io.h"     <regex.h>.  */
75  #endif  #include <sys/types.h>
   
 #ifdef INSIDE_RECURSION  
 /* Common operations on the compiled pattern.  */  
   
 /* Store NUMBER in two contiguous bytes starting at DESTINATION.  */  
 /* ifdef MBS_SUPPORT, we store NUMBER in 1 element.  */  
   
 # ifdef WCHAR  
 #  define STORE_NUMBER(destination, number)                             \  
   do {                                                                  \  
     *(destination) = (UCHAR_T)(number);                         \  
   } while (0)  
 # else /* BYTE */  
 #  define STORE_NUMBER(destination, number)                             \  
   do {                                                                  \  
     (destination)[0] = (number) & 0377;                                 \  
     (destination)[1] = (number) >> 8;                                   \  
   } while (0)  
 # endif /* WCHAR */  
   
 /* Same as STORE_NUMBER, except increment DESTINATION to  
    the byte after where the number is stored.  Therefore, DESTINATION  
    must be an lvalue.  */  
 /* ifdef MBS_SUPPORT, we store NUMBER in 1 element.  */  
   
 # define STORE_NUMBER_AND_INCR(destination, number)                     \  
   do {                                                                  \  
     STORE_NUMBER (destination, number);                                 \  
     (destination) += OFFSET_ADDRESS_SIZE;                               \  
   } while (0)  
   
 /* Put into DESTINATION a number stored in two contiguous bytes starting  
    at SOURCE.  */  
 /* ifdef MBS_SUPPORT, we store NUMBER in 1 element.  */  
   
 # ifdef WCHAR  
 #  define EXTRACT_NUMBER(destination, source)                           \  
   do {                                                                  \  
     (destination) = *(source);                                          \  
   } while (0)  
 # else /* BYTE */  
 #  define EXTRACT_NUMBER(destination, source)                           \  
   do {                                                                  \  
     (destination) = *(source) & 0377;                                   \  
     (destination) += (signed char) (*((source) + 1)) << 8;              \  
   } while (0)  
 # endif  
   
 # ifdef DEBUG  
 static void  
 PREFIX(extract_number) (int *dest, UCHAR_T *source)  
 {  
 #  ifdef WCHAR  
   *dest = *source;  
 #  else /* BYTE */  
   signed char temp = source[1];  
   *dest = *source & 0377;  
   *dest += temp << 8;  
 #  endif  
 }  
   
 #  ifndef EXTRACT_MACROS /* To debug the macros.  */  
 #   undef EXTRACT_NUMBER  
 #   define EXTRACT_NUMBER(dest, src) PREFIX(extract_number) (&dest, src)  
 #  endif /* not EXTRACT_MACROS */  
   
 # endif /* DEBUG */  
   
 /* Same as EXTRACT_NUMBER, except increment SOURCE to after the number.  
    SOURCE must be an lvalue.  */  
   
 # define EXTRACT_NUMBER_AND_INCR(destination, source)                   \  
   do {                                                                  \  
     EXTRACT_NUMBER (destination, source);                               \  
     (source) += OFFSET_ADDRESS_SIZE;                                    \  
   } while (0)  
   
 # ifdef DEBUG  
 static void  
 PREFIX(extract_number_and_incr) (int *destination, UCHAR_T **source)  
 {  
   PREFIX(extract_number) (destination, *source);  
   *source += OFFSET_ADDRESS_SIZE;  
 }  
   
 #  ifndef EXTRACT_MACROS  
 #   undef EXTRACT_NUMBER_AND_INCR  
 #   define EXTRACT_NUMBER_AND_INCR(dest, src) \  
   PREFIX(extract_number_and_incr) (&dest, &src)  
 #  endif /* not EXTRACT_MACROS */  
   
 # endif /* DEBUG */  
   
   
   
 /* If DEBUG is defined, Regex prints many voluminous messages about what  
    it is doing (if the variable `debug' is nonzero).  If linked with the  
    main program in `iregex.c', you can enter patterns and strings  
    interactively.  And if linked with the main program in `main.c' and  
    the other test files, you can run the already-written tests.  */  
   
 # ifdef DEBUG  
   
 #  ifndef DEFINED_ONCE  
   
 /* We use standard I/O for debugging.  */  
 #   include <stdio.h>  
   
 /* It is useful to test things that ``must'' be true when debugging.  */  
 #   include <assert.h>  
   
 static int debug;  
   
 #   define DEBUG_STATEMENT(e) e  
 #   define DEBUG_PRINT1(x) if (debug) printf (x)  
 #   define DEBUG_PRINT2(x1, x2) if (debug) printf (x1, x2)  
 #   define DEBUG_PRINT3(x1, x2, x3) if (debug) printf (x1, x2, x3)  
 #   define DEBUG_PRINT4(x1, x2, x3, x4) if (debug) printf (x1, x2, x3, x4)  
 #  endif /* not DEFINED_ONCE */  
   
 #  define DEBUG_PRINT_COMPILED_PATTERN(p, s, e)                         \  
   if (debug) PREFIX(print_partial_compiled_pattern) (s, e)  
 #  define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2)                \  
   if (debug) PREFIX(print_double_string) (w, s1, sz1, s2, sz2)  
   
   
 /* Print the fastmap in human-readable form.  */  
   
 #  ifndef DEFINED_ONCE  
 void  
 print_fastmap (char *fastmap)  
 {  
   unsigned was_a_range = 0;  
   unsigned i = 0;  
   
   while (i < (1 << BYTEWIDTH))  
     {  
       if (fastmap[i++])  
         {  
           was_a_range = 0;  
           putchar (i - 1);  
           while (i < (1 << BYTEWIDTH)  &&  fastmap[i])  
             {  
               was_a_range = 1;  
               i++;  
             }  
           if (was_a_range)  
             {  
               printf ("-");  
               putchar (i - 1);  
             }  
         }  
     }  
   putchar ('\n');  
 }  
 #  endif /* not DEFINED_ONCE */  
   
   
 /* Print a compiled pattern string in human-readable form, starting at  
    the START pointer into it and ending just before the pointer END.  */  
   
 void  
 PREFIX(print_partial_compiled_pattern) (UCHAR_T *start, UCHAR_T *end)  
 {  
   int mcnt, mcnt2;  
   UCHAR_T *p1;  
   UCHAR_T *p = start;  
   UCHAR_T *pend = end;  
   
   if (start == NULL)  
     {  
       printf ("(null)\n");  
       return;  
     }  
   
   /* Loop over pattern commands.  */  
   while (p < pend)  
     {  
 #  ifdef _LIBC  
       printf ("%td:\t", p - start);  
 #  else  
       printf ("%ld:\t", (long int) (p - start));  
 #  endif  
   
       switch ((re_opcode_t) *p++)  
         {  
         case no_op:  
           printf ("/no_op");  
           break;  
   
         case exactn:  
           mcnt = *p++;  
           printf ("/exactn/%d", mcnt);  
           do  
             {  
               putchar ('/');  
               PUT_CHAR (*p++);  
             }  
           while (--mcnt);  
           break;  
   
 #  ifdef MBS_SUPPORT  
         case exactn_bin:  
           mcnt = *p++;  
           printf ("/exactn_bin/%d", mcnt);  
           do  
             {  
               printf("/%lx", (long int) *p++);  
             }  
           while (--mcnt);  
           break;  
 #  endif /* MBS_SUPPORT */  
   
         case start_memory:  
           mcnt = *p++;  
           printf ("/start_memory/%d/%ld", mcnt, (long int) *p++);  
           break;  
   
         case stop_memory:  
           mcnt = *p++;  
           printf ("/stop_memory/%d/%ld", mcnt, (long int) *p++);  
           break;  
   
         case duplicate:  
           printf ("/duplicate/%ld", (long int) *p++);  
           break;  
   
         case anychar:  
           printf ("/anychar");  
           break;  
   
         case charset:  
         case charset_not:  
           {  
 #  ifdef WCHAR  
             int i, length;  
             wchar_t *workp = p;  
             printf ("/charset [%s",  
                     (re_opcode_t) *(workp - 1) == charset_not ? "^" : "");  
             p += 5;  
             length = *workp++; /* the length of char_classes */  
             for (i=0 ; i<length ; i++)  
               printf("[:%lx:]", (long int) *p++);  
             length = *workp++; /* the length of collating_symbol */  
             for (i=0 ; i<length ;)  
               {  
                 printf("[.");  
                 while(*p != 0)  
                   PUT_CHAR((i++,*p++));  
                 i++,p++;  
                 printf(".]");  
               }  
             length = *workp++; /* the length of equivalence_class */  
             for (i=0 ; i<length ;)  
               {  
                 printf("[=");  
                 while(*p != 0)  
                   PUT_CHAR((i++,*p++));  
                 i++,p++;  
                 printf("=]");  
               }  
             length = *workp++; /* the length of char_range */  
             for (i=0 ; i<length ; i++)  
               {  
                 wchar_t range_start = *p++;  
                 wchar_t range_end = *p++;  
                 printf("%C-%C", range_start, range_end);  
               }  
             length = *workp++; /* the length of char */  
             for (i=0 ; i<length ; i++)  
               printf("%C", *p++);  
             putchar (']');  
 #  else  
             register int c, last = -100;  
             register int in_range = 0;  
   
             printf ("/charset [%s",  
                     (re_opcode_t) *(p - 1) == charset_not ? "^" : "");  
   
             assert (p + *p < pend);  
   
             for (c = 0; c < 256; c++)  
               if (c / 8 < *p  
                   && (p[1 + (c/8)] & (1 << (c % 8))))  
                 {  
                   /* Are we starting a range?  */  
                   if (last + 1 == c && ! in_range)  
                     {  
                       putchar ('-');  
                       in_range = 1;  
                     }  
                   /* Have we broken a range?  */  
                   else if (last + 1 != c && in_range)  
               {  
                       putchar (last);  
                       in_range = 0;  
                     }  
   
                   if (! in_range)  
                     putchar (c);  
   
                   last = c;  
               }  
   
             if (in_range)  
               putchar (last);  
   
             putchar (']');  
   
             p += 1 + *p;  
 #  endif /* WCHAR */  
           }  
           break;  
   
         case begline:  
           printf ("/begline");  
           break;  
   
         case endline:  
           printf ("/endline");  
           break;  
   
         case on_failure_jump:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
 #  ifdef _LIBC  
           printf ("/on_failure_jump to %td", p + mcnt - start);  
 #  else  
           printf ("/on_failure_jump to %ld", (long int) (p + mcnt - start));  
 #  endif  
           break;  
   
         case on_failure_keep_string_jump:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
 #  ifdef _LIBC  
           printf ("/on_failure_keep_string_jump to %td", p + mcnt - start);  
 #  else  
           printf ("/on_failure_keep_string_jump to %ld",  
                   (long int) (p + mcnt - start));  
 #  endif  
           break;  
   
         case dummy_failure_jump:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
 #  ifdef _LIBC  
           printf ("/dummy_failure_jump to %td", p + mcnt - start);  
 #  else  
           printf ("/dummy_failure_jump to %ld", (long int) (p + mcnt - start));  
 #  endif  
           break;  
   
         case push_dummy_failure:  
           printf ("/push_dummy_failure");  
           break;  
   
         case maybe_pop_jump:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
 #  ifdef _LIBC  
           printf ("/maybe_pop_jump to %td", p + mcnt - start);  
 #  else  
           printf ("/maybe_pop_jump to %ld", (long int) (p + mcnt - start));  
 #  endif  
           break;  
   
         case pop_failure_jump:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
 #  ifdef _LIBC  
           printf ("/pop_failure_jump to %td", p + mcnt - start);  
 #  else  
           printf ("/pop_failure_jump to %ld", (long int) (p + mcnt - start));  
 #  endif  
           break;  
   
         case jump_past_alt:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
 #  ifdef _LIBC  
           printf ("/jump_past_alt to %td", p + mcnt - start);  
 #  else  
           printf ("/jump_past_alt to %ld", (long int) (p + mcnt - start));  
 #  endif  
           break;  
   
         case jump:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
 #  ifdef _LIBC  
           printf ("/jump to %td", p + mcnt - start);  
 #  else  
           printf ("/jump to %ld", (long int) (p + mcnt - start));  
 #  endif  
           break;  
   
         case succeed_n:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
           p1 = p + mcnt;  
           PREFIX(extract_number_and_incr) (&mcnt2, &p);  
 #  ifdef _LIBC  
           printf ("/succeed_n to %td, %d times", p1 - start, mcnt2);  
 #  else  
           printf ("/succeed_n to %ld, %d times",  
                   (long int) (p1 - start), mcnt2);  
 #  endif  
           break;  
   
         case jump_n:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
           p1 = p + mcnt;  
           PREFIX(extract_number_and_incr) (&mcnt2, &p);  
           printf ("/jump_n to %d, %d times", p1 - start, mcnt2);  
           break;  
   
         case set_number_at:  
           PREFIX(extract_number_and_incr) (&mcnt, &p);  
           p1 = p + mcnt;  
           PREFIX(extract_number_and_incr) (&mcnt2, &p);  
 #  ifdef _LIBC  
           printf ("/set_number_at location %td to %d", p1 - start, mcnt2);  
 #  else  
           printf ("/set_number_at location %ld to %d",  
                   (long int) (p1 - start), mcnt2);  
 #  endif  
           break;  
   
         case wordbound:  
           printf ("/wordbound");  
           break;  
   
         case notwordbound:  
           printf ("/notwordbound");  
           break;  
   
         case wordbeg:  
           printf ("/wordbeg");  
           break;  
   
         case wordend:  
           printf ("/wordend");  
           break;  
   
 #  ifdef emacs  
         case before_dot:  
           printf ("/before_dot");  
           break;  
   
         case at_dot:  
           printf ("/at_dot");  
           break;  
   
         case after_dot:  
           printf ("/after_dot");  
           break;  
   
         case syntaxspec:  
           printf ("/syntaxspec");  
           mcnt = *p++;  
           printf ("/%d", mcnt);  
           break;  
   
         case notsyntaxspec:  
           printf ("/notsyntaxspec");  
           mcnt = *p++;  
           printf ("/%d", mcnt);  
           break;  
 #  endif /* emacs */  
   
         case wordchar:  
           printf ("/wordchar");  
           break;  
   
         case notwordchar:  
           printf ("/notwordchar");  
           break;  
   
         case begbuf:  
           printf ("/begbuf");  
           break;  
   
         case endbuf:  
           printf ("/endbuf");  
           break;  
   
         default:  
           printf ("?%ld", (long int) *(p-1));  
         }  
   
       putchar ('\n');  
     }  
   
 #  ifdef _LIBC  
   printf ("%td:\tend of pattern.\n", p - start);  
 #  else  
   printf ("%ld:\tend of pattern.\n", (long int) (p - start));  
 #  endif  
 }  
   
   
 void  
 PREFIX(print_compiled_pattern) (struct re_pattern_buffer *bufp)  
 {  
   UCHAR_T *buffer = (UCHAR_T*) bufp->buffer;  
   
   PREFIX(print_partial_compiled_pattern) (buffer, buffer  
                                   + bufp->used / sizeof(UCHAR_T));  
   printf ("%ld bytes used/%ld bytes allocated.\n",  
           bufp->used, bufp->allocated);  
   
   if (bufp->fastmap_accurate && bufp->fastmap)  
     {  
       printf ("fastmap: ");  
       print_fastmap (bufp->fastmap);  
     }  
   
 #  ifdef _LIBC  
   printf ("re_nsub: %Zd\t", bufp->re_nsub);  
 #  else  
   printf ("re_nsub: %ld\t", (long int) bufp->re_nsub);  
 #  endif  
   printf ("regs_alloc: %d\t", bufp->regs_allocated);  
   printf ("can_be_null: %d\t", bufp->can_be_null);  
   printf ("newline_anchor: %d\n", bufp->newline_anchor);  
   printf ("no_sub: %d\t", bufp->no_sub);  
   printf ("not_bol: %d\t", bufp->not_bol);  
   printf ("not_eol: %d\t", bufp->not_eol);  
   printf ("syntax: %lx\n", bufp->syntax);  
   /* Perhaps we should print the translate table?  */  
 }  
   
   
 void  
 PREFIX(print_double_string) (const CHAR_T *where,  
                              const CHAR_T *string1,  
                              const CHAR_T *string2,  
                              int size1,  
                              int size2)  
 {  
   int this_char;  
   
   if (where == NULL)  
     printf ("(null)");  
   else  
     {  
       int cnt;  
   
       if (FIRST_STRING_P (where))  
         {  
           for (this_char = where - string1; this_char < size1; this_char++)  
             PUT_CHAR (string1[this_char]);  
   
           where = string2;  
         }  
   
       cnt = 0;  
       for (this_char = where - string2; this_char < size2; this_char++)  
         {  
           PUT_CHAR (string2[this_char]);  
           if (++cnt > 100)  
             {  
               fputs ("...", stdout);  
               break;  
             }  
         }  
     }  
 }  
   
 #  ifndef DEFINED_ONCE  
 void  
 printchar (c)  
      int c;  
 {  
   putc (c, stderr);  
 }  
 #  endif  
   
 # else /* not DEBUG */  
   
 #  ifndef DEFINED_ONCE  
 #   undef assert  
 #   define assert(e)  
   
 #   define DEBUG_STATEMENT(e)  
 #   define DEBUG_PRINT1(x)  
 #   define DEBUG_PRINT2(x1, x2)  
 #   define DEBUG_PRINT3(x1, x2, x3)  
 #   define DEBUG_PRINT4(x1, x2, x3, x4)  
 #  endif /* not DEFINED_ONCE */  
 #  define DEBUG_PRINT_COMPILED_PATTERN(p, s, e)  
 #  define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2)  
   
 # endif /* not DEBUG */  
   
   
   
 # ifdef WCHAR  
 /* This  convert a multibyte string to a wide character string.  
    And write their correspondances to offset_buffer(see below)  
    and write whether each wchar_t is binary data to is_binary.  
    This assume invalid multibyte sequences as binary data.  
    We assume offset_buffer and is_binary is already allocated  
    enough space.  */  
   
 static size_t  
 convert_mbs_to_wcs (CHAR_T *dest,  
                     const unsigned char* src,  
   
                     /* The length of multibyte string.  */  
                     size_t len,  
76    
77                      /* Correspondences between src(char string) and  /* On some systems, limits.h sets RE_DUP_MAX to a lower value than
78                         dest(wchar_t string) for optimization.  E.g.:     GNU regex allows.  Include it before <regex.h>, which correctly
79                         src  = "xxxyzz"     #undefs RE_DUP_MAX and sets it to the right value.  */
80                         dest = {'X', 'Y', 'Z'}  #include <limits.h>
                          (each "xxx", "y" and "zz" represent one  
                           multibyte character corresponding to 'X',  
                           'Y' and 'Z'.)  
                        offset_buffer = {0, 0+3("xxx"), 0+3+1("y"),  
                                         0+3+1+2("zz")}  
                                      = {0, 3, 4, 6} */  
                     int *offset_buffer,  
81    
82                      char *is_binary)  #include <regex.h>
83  {  #include "regex_internal.h"
   wchar_t *pdest = dest;  
   const unsigned char *psrc = src;  
   size_t wc_count = 0;  
84    
85    mbstate_t mbs;  #include "regex_internal.c"
86    int i, consumed;  #include "regcomp.c"
87    size_t mb_remain = len;  #include "regexec.c"
   size_t mb_count = 0;  
88    
89    /* Initialize the conversion state.  */  /* Binary backward compatibility.  */
90    memset (&mbs, 0, sizeof (mbstate_t));  #if _LIBC
91    # include <shlib-compat.h>
92    offset_buffer[0] = 0;  # if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3)
93    for( ; mb_remain > 0 ; ++wc_count, ++pdest, mb_remain -= consumed,  link_warning (re_max_failures, "the 're_max_failures' variable is obsolete and will go away.")
          psrc += consumed)  
     {  
       consumed = mbrtowc (pdest, psrc, mb_remain, &mbs);  
   
       if (consumed <= 0)  
         /* failed to convert. maybe src contains binary data.  
            So we consume 1 byte manualy.  */  
         {  
           *pdest = *psrc;  
           consumed = 1;  
           is_binary[wc_count] = TRUE;  
         }  
       else  
         is_binary[wc_count] = FALSE;  
       /* In sjis encoding, we use yen sign as escape character in  
          place of reverse solidus. So we convert 0x5c(yen sign in  
          sjis) to not 0xa5(yen sign in UCS2) but 0x5c(reverse  
          solidus in UCS2).  */  
       if (consumed == 1 && (int) *psrc == 0x5c && (int) *pdest == 0xa5)  
         *pdest = (wchar_t) *psrc;  
   
       offset_buffer[wc_count + 1] = mb_count += consumed;  
     }  
   
   /* Fill remain of the buffer with sentinel.  */  
   for (i = wc_count + 1 ; i <= len ; i++)  
     offset_buffer[i] = mb_count + 1;  
   
   return wc_count;  
 }  
   
 # endif /* WCHAR */  
   
 #else /* not INSIDE_RECURSION */  
   
 /* Set by `re_set_syntax' to the current regexp syntax to recognize.  Can  
    also be assigned to arbitrarily: each pattern buffer stores its own  
    syntax, so it can be changed between regex compilations.  */  
 /* This has no initializer because initialized variables in Emacs  
    become read-only after dumping.  */  
 reg_syntax_t re_syntax_options;  
   
   
 /* Specify the precise syntax of regexps for compilation.  This provides  
    for compatibility for various utilities which historically have  
    different, incompatible syntaxes.  
   
    The argument SYNTAX is a bit mask comprised of the various bits  
    defined in regex.h.  We return the old syntax.  */  
   
 reg_syntax_t  
 re_set_syntax (reg_syntax_t syntax)  
 {  
   reg_syntax_t ret = re_syntax_options;  
   
   re_syntax_options = syntax;  
 # ifdef DEBUG  
   if (syntax & RE_DEBUG)  
     debug = 1;  
   else if (debug) /* was on but now is not */  
     debug = 0;  
 # endif /* DEBUG */  
   return ret;  
 }  
 # ifdef _LIBC  
 weak_alias (__re_set_syntax, re_set_syntax)  
 # endif  
   
 /* This table gives an error message for each of the error codes listed  
    in regex.h.  Obviously the order here has to be same as there.  
    POSIX doesn't require that we do anything for REG_NOERROR,  
    but why not be nice?  */  
   
 static const char re_error_msgid[] =  
   {  
 # define REG_NOERROR_IDX        0  
     gettext_noop ("Success")    /* REG_NOERROR */  
     "\0"  
 # define REG_NOMATCH_IDX (REG_NOERROR_IDX + sizeof "Success")  
     gettext_noop ("No match")   /* REG_NOMATCH */  
     "\0"  
 # define REG_BADPAT_IDX (REG_NOMATCH_IDX + sizeof "No match")  
     gettext_noop ("Invalid regular expression") /* REG_BADPAT */  
     "\0"  
 # define REG_ECOLLATE_IDX (REG_BADPAT_IDX + sizeof "Invalid regular expression")  
     gettext_noop ("Invalid collation character") /* REG_ECOLLATE */  
     "\0"  
 # define REG_ECTYPE_IDX (REG_ECOLLATE_IDX + sizeof "Invalid collation character")  
     gettext_noop ("Invalid character class name") /* REG_ECTYPE */  
     "\0"  
 # define REG_EESCAPE_IDX        (REG_ECTYPE_IDX + sizeof "Invalid character class name")  
     gettext_noop ("Trailing backslash") /* REG_EESCAPE */  
     "\0"  
 # define REG_ESUBREG_IDX        (REG_EESCAPE_IDX + sizeof "Trailing backslash")  
     gettext_noop ("Invalid back reference") /* REG_ESUBREG */  
     "\0"  
 # define REG_EBRACK_IDX (REG_ESUBREG_IDX + sizeof "Invalid back reference")  
     gettext_noop ("Unmatched [ or [^")  /* REG_EBRACK */  
     "\0"  
 # define REG_EPAREN_IDX (REG_EBRACK_IDX + sizeof "Unmatched [ or [^")  
     gettext_noop ("Unmatched ( or \\(") /* REG_EPAREN */  
     "\0"  
 # define REG_EBRACE_IDX (REG_EPAREN_IDX + sizeof "Unmatched ( or \\(")  
     gettext_noop ("Unmatched \\{") /* REG_EBRACE */  
     "\0"  
 # define REG_BADBR_IDX  (REG_EBRACE_IDX + sizeof "Unmatched \\{")  
     gettext_noop ("Invalid content of \\{\\}") /* REG_BADBR */  
     "\0"  
 # define REG_ERANGE_IDX (REG_BADBR_IDX + sizeof "Invalid content of \\{\\}")  
     gettext_noop ("Invalid range end")  /* REG_ERANGE */  
     "\0"  
 # define REG_ESPACE_IDX (REG_ERANGE_IDX + sizeof "Invalid range end")  
     gettext_noop ("Memory exhausted") /* REG_ESPACE */  
     "\0"  
 # define REG_BADRPT_IDX (REG_ESPACE_IDX + sizeof "Memory exhausted")  
     gettext_noop ("Invalid preceding regular expression") /* REG_BADRPT */  
     "\0"  
 # define REG_EEND_IDX   (REG_BADRPT_IDX + sizeof "Invalid preceding regular expression")  
     gettext_noop ("Premature end of regular expression") /* REG_EEND */  
     "\0"  
 # define REG_ESIZE_IDX  (REG_EEND_IDX + sizeof "Premature end of regular expression")  
     gettext_noop ("Regular expression too big") /* REG_ESIZE */  
     "\0"  
 # define REG_ERPAREN_IDX        (REG_ESIZE_IDX + sizeof "Regular expression too big")  
     gettext_noop ("Unmatched ) or \\)") /* REG_ERPAREN */  
   };  
   
 static const size_t re_error_msgid_idx[] =  
   {  
     REG_NOERROR_IDX,  
     REG_NOMATCH_IDX,  
     REG_BADPAT_IDX,  
     REG_ECOLLATE_IDX,  
     REG_ECTYPE_IDX,  
     REG_EESCAPE_IDX,  
     REG_ESUBREG_IDX,  
     REG_EBRACK_IDX,  
     REG_EPAREN_IDX,  
     REG_EBRACE_IDX,  
     REG_BADBR_IDX,  
     REG_ERANGE_IDX,  
     REG_ESPACE_IDX,  
     REG_BADRPT_IDX,  
     REG_EEND_IDX,  
     REG_ESIZE_IDX,  
     REG_ERPAREN_IDX  
   };  
   
 #endif /* INSIDE_RECURSION */  
   
 #ifndef DEFINED_ONCE  
 /* Avoiding alloca during matching, to placate r_alloc.  */  
   
 /* Define MATCH_MAY_ALLOCATE unless we need to make sure that the  
    searching and matching functions should not call alloca.  On some  
    systems, alloca is implemented in terms of malloc, and if we're  
    using the relocating allocator routines, then malloc could cause a  
    relocation, which might (if the strings being searched are in the  
    ralloc heap) shift the data out from underneath the regexp  
    routines.  
   
    Here's another reason to avoid allocation: Emacs  
    processes input from X in a signal handler; processing X input may  
    call malloc; if input arrives while a matching routine is calling  
    malloc, then we're scrod.  But Emacs can't just block input while  
    calling matching routines; then we don't notice interrupts when  
    they come in.  So, Emacs blocks input around all regexp calls  
    except the matching calls, which it leaves unprotected, in the  
    faith that they will not malloc.  */  
   
 /* Normally, this is fine.  */  
 # define MATCH_MAY_ALLOCATE  
   
 /* When using GNU C, we are not REALLY using the C alloca, no matter  
    what config.h may say.  So don't take precautions for it.  */  
 # ifdef __GNUC__  
 #  undef C_ALLOCA  
 # endif  
   
 /* The match routines may not allocate if (1) they would do it with malloc  
    and (2) it's not safe for them to use malloc.  
    Note that if REL_ALLOC is defined, matching would not use malloc for the  
    failure stack, but we would still use it for the register vectors;  
    so REL_ALLOC should not affect this.  */  
 # if (defined C_ALLOCA || defined REGEX_MALLOC) && defined emacs  
 #  undef MATCH_MAY_ALLOCATE  
 # endif  
 #endif /* not DEFINED_ONCE */  
   
 #ifdef INSIDE_RECURSION  
 /* Failure stack declarations and macros; both re_compile_fastmap and  
    re_match_2 use a failure stack.  These have to be macros because of  
    REGEX_ALLOCATE_STACK.  */  
   
   
 /* Number of failure points for which to initially allocate space  
    when matching.  If this number is exceeded, we allocate more  
    space, so it is not a hard limit.  */  
 # ifndef INIT_FAILURE_ALLOC  
 #  define INIT_FAILURE_ALLOC 5  
 # endif  
   
 /* Roughly the maximum number of failure points on the stack.  Would be  
    exactly that if always used MAX_FAILURE_ITEMS items each time we failed.  
    This is a variable only so users of regex can assign to it; we never  
    change it ourselves.  */  
   
 # ifdef INT_IS_16BIT  
   
 #  ifndef DEFINED_ONCE  
 #   if defined MATCH_MAY_ALLOCATE  
 /* 4400 was enough to cause a crash on Alpha OSF/1,  
    whose default stack limit is 2mb.  */  
 long int re_max_failures = 4000;  
 #   else  
 long int re_max_failures = 2000;  
 #   endif  
 #  endif  
   
 union PREFIX(fail_stack_elt)  
 {  
   UCHAR_T *pointer;  
   long int integer;  
 };  
   
 typedef union PREFIX(fail_stack_elt) PREFIX(fail_stack_elt_t);  
   
 typedef struct  
 {  
   PREFIX(fail_stack_elt_t) *stack;  
   unsigned long int size;  
   unsigned long int avail;              /* Offset of next open position.  */  
 } PREFIX(fail_stack_type);  
   
 # else /* not INT_IS_16BIT */  
   
 #  ifndef DEFINED_ONCE  
 #   if defined MATCH_MAY_ALLOCATE  
 /* 4400 was enough to cause a crash on Alpha OSF/1,  
    whose default stack limit is 2mb.  */  
 int re_max_failures = 4000;  
 #   else  
94  int re_max_failures = 2000;  int re_max_failures = 2000;
 #   endif  
 #  endif  
   
 union PREFIX(fail_stack_elt)  
 {  
   UCHAR_T *pointer;  
   int integer;  
 };  
   
 typedef union PREFIX(fail_stack_elt) PREFIX(fail_stack_elt_t);  
   
 typedef struct  
 {  
   PREFIX(fail_stack_elt_t) *stack;  
   unsigned size;  
   unsigned avail;                       /* Offset of next open position.  */  
 } PREFIX(fail_stack_type);  
   
 # endif /* INT_IS_16BIT */  
   
 # ifndef DEFINED_ONCE  
 #  define FAIL_STACK_EMPTY()     (fail_stack.avail == 0)  
 #  define FAIL_STACK_PTR_EMPTY() (fail_stack_ptr->avail == 0)  
 #  define FAIL_STACK_FULL()      (fail_stack.avail == fail_stack.size)  
 # endif  
   
   
 /* Define macros to initialize and free the failure stack.  
    Do `return -2' if the alloc fails.  */  
   
 # ifdef MATCH_MAY_ALLOCATE  
 #  define INIT_FAIL_STACK()                                             \  
   do {                                                                  \  
     fail_stack.stack = (PREFIX(fail_stack_elt_t) *)             \  
       REGEX_ALLOCATE_STACK (INIT_FAILURE_ALLOC * sizeof (PREFIX(fail_stack_elt_t))); \  
                                                                         \  
     if (fail_stack.stack == NULL)                               \  
       return -2;                                                        \  
                                                                         \  
     fail_stack.size = INIT_FAILURE_ALLOC;                       \  
     fail_stack.avail = 0;                                       \  
   } while (0)  
   
 #  define RESET_FAIL_STACK()  REGEX_FREE_STACK (fail_stack.stack)  
 # else  
 #  define INIT_FAIL_STACK()                                             \  
   do {                                                                  \  
     fail_stack.avail = 0;                                       \  
   } while (0)  
   
 #  define RESET_FAIL_STACK()  
 # endif  
   
   
 /* Double the size of FAIL_STACK, up to approximately `re_max_failures' items.  
   
    Return 1 if succeeds, and 0 if either ran out of memory  
    allocating space for it or it was already too large.  
   
    REGEX_REALLOCATE_STACK requires `destination' be declared.   */  
   
 # define DOUBLE_FAIL_STACK(fail_stack)                                  \  
   ((fail_stack).size > (unsigned) (re_max_failures * MAX_FAILURE_ITEMS) \  
    ? 0                                                                  \  
    : ((fail_stack).stack = (PREFIX(fail_stack_elt_t) *)                 \  
         REGEX_REALLOCATE_STACK ((fail_stack).stack,                     \  
           (fail_stack).size * sizeof (PREFIX(fail_stack_elt_t)),        \  
           ((fail_stack).size << 1) * sizeof (PREFIX(fail_stack_elt_t))),\  
                                                                         \  
       (fail_stack).stack == NULL                                        \  
       ? 0                                                               \  
       : ((fail_stack).size <<= 1,                                       \  
          1)))  
   
   
 /* Push pointer POINTER on FAIL_STACK.  
    Return 1 if was able to do so and 0 if ran out of memory allocating  
    space to do so.  */  
 # define PUSH_PATTERN_OP(POINTER, FAIL_STACK)                           \  
   ((FAIL_STACK_FULL ()                                                  \  
     && !DOUBLE_FAIL_STACK (FAIL_STACK))                                 \  
    ? 0                                                                  \  
    : ((FAIL_STACK).stack[(FAIL_STACK).avail++].pointer = POINTER,       \  
       1))  
   
 /* Push a pointer value onto the failure stack.  
    Assumes the variable `fail_stack'.  Probably should only  
    be called from within `PUSH_FAILURE_POINT'.  */  
 # define PUSH_FAILURE_POINTER(item)                                     \  
   fail_stack.stack[fail_stack.avail++].pointer = (UCHAR_T *) (item)  
   
 /* This pushes an integer-valued item onto the failure stack.  
    Assumes the variable `fail_stack'.  Probably should only  
    be called from within `PUSH_FAILURE_POINT'.  */  
 # define PUSH_FAILURE_INT(item)                                 \  
   fail_stack.stack[fail_stack.avail++].integer = (item)  
   
 /* Push a fail_stack_elt_t value onto the failure stack.  
    Assumes the variable `fail_stack'.  Probably should only  
    be called from within `PUSH_FAILURE_POINT'.  */  
 # define PUSH_FAILURE_ELT(item)                                 \  
   fail_stack.stack[fail_stack.avail++] =  (item)  
   
 /* These three POP... operations complement the three PUSH... operations.  
    All assume that `fail_stack' is nonempty.  */  
 # define POP_FAILURE_POINTER() fail_stack.stack[--fail_stack.avail].pointer  
 # define POP_FAILURE_INT() fail_stack.stack[--fail_stack.avail].integer  
 # define POP_FAILURE_ELT() fail_stack.stack[--fail_stack.avail]  
   
 /* Used to omit pushing failure point id's when we're not debugging.  */  
 # ifdef DEBUG  
 #  define DEBUG_PUSH PUSH_FAILURE_INT  
 #  define DEBUG_POP(item_addr) *(item_addr) = POP_FAILURE_INT ()  
 # else  
 #  define DEBUG_PUSH(item)  
 #  define DEBUG_POP(item_addr)  
 # endif  
   
   
 /* Push the information about the state we will need  
    if we ever fail back to it.  
   
    Requires variables fail_stack, regstart, regend, reg_info, and  
    num_regs_pushed be declared.  DOUBLE_FAIL_STACK requires `destination'  
    be declared.  
   
    Does `return FAILURE_CODE' if runs out of memory.  */  
   
 # define PUSH_FAILURE_POINT(pattern_place, string_place, failure_code)  \  
   do {                                                                  \  
     char *destination;                                                  \  
     /* Must be int, so when we don't save any registers, the arithmetic \  
        of 0 + -1 isn't done as unsigned.  */                            \  
     /* Can't be int, since there is not a shred of a guarantee that int \  
        is wide enough to hold a value of something to which pointer can \  
        be assigned */                                                   \  
     active_reg_t this_reg;                                              \  
                                                                         \  
     DEBUG_STATEMENT (failure_id++);                                     \  
     DEBUG_STATEMENT (nfailure_points_pushed++);                         \  
     DEBUG_PRINT2 ("\nPUSH_FAILURE_POINT #%u:\n", failure_id);           \  
     DEBUG_PRINT2 ("  Before push, next avail: %d\n", (fail_stack).avail);\  
     DEBUG_PRINT2 ("                     size: %d\n", (fail_stack).size);\  
                                                                         \  
     DEBUG_PRINT2 ("  slots needed: %ld\n", NUM_FAILURE_ITEMS);          \  
     DEBUG_PRINT2 ("     available: %d\n", REMAINING_AVAIL_SLOTS);       \  
                                                                         \  
     /* Ensure we have enough space allocated for what we will push.  */ \  
     while (REMAINING_AVAIL_SLOTS < NUM_FAILURE_ITEMS)                   \  
       {                                                                 \  
         if (!DOUBLE_FAIL_STACK (fail_stack))                            \  
           return failure_code;                                          \  
                                                                         \  
         DEBUG_PRINT2 ("\n  Doubled stack; size now: %d\n",              \  
                        (fail_stack).size);                              \  
         DEBUG_PRINT2 ("  slots available: %d\n", REMAINING_AVAIL_SLOTS);\  
       }                                                                 \  
                                                                         \  
     /* Push the info, starting with the registers.  */                  \  
     DEBUG_PRINT1 ("\n");                                                \  
                                                                         \  
     if (1)                                                              \  
       for (this_reg = lowest_active_reg; this_reg <= highest_active_reg; \  
            this_reg++)                                                  \  
         {                                                               \  
           DEBUG_PRINT2 ("  Pushing reg: %lu\n", this_reg);              \  
           DEBUG_STATEMENT (num_regs_pushed++);                          \  
                                                                         \  
           DEBUG_PRINT2 ("    start: %p\n", regstart[this_reg]);         \  
           PUSH_FAILURE_POINTER (regstart[this_reg]);                    \  
                                                                         \  
           DEBUG_PRINT2 ("    end: %p\n", regend[this_reg]);             \  
           PUSH_FAILURE_POINTER (regend[this_reg]);                      \  
                                                                         \  
           DEBUG_PRINT2 ("    info: %p\n      ",                         \  
                         reg_info[this_reg].word.pointer);               \  
           DEBUG_PRINT2 (" match_null=%d",                               \  
                         REG_MATCH_NULL_STRING_P (reg_info[this_reg]));  \  
           DEBUG_PRINT2 (" active=%d", IS_ACTIVE (reg_info[this_reg]));  \  
           DEBUG_PRINT2 (" matched_something=%d",                        \  
                         MATCHED_SOMETHING (reg_info[this_reg]));        \  
           DEBUG_PRINT2 (" ever_matched=%d",                             \  
                         EVER_MATCHED_SOMETHING (reg_info[this_reg]));   \  
           DEBUG_PRINT1 ("\n");                                          \  
           PUSH_FAILURE_ELT (reg_info[this_reg].word);                   \  
         }                                                               \  
                                                                         \  
     DEBUG_PRINT2 ("  Pushing  low active reg: %ld\n", lowest_active_reg);\  
     PUSH_FAILURE_INT (lowest_active_reg);                               \  
                                                                         \  
     DEBUG_PRINT2 ("  Pushing high active reg: %ld\n", highest_active_reg);\  
     PUSH_FAILURE_INT (highest_active_reg);                              \  
                                                                         \  
     DEBUG_PRINT2 ("  Pushing pattern %p:\n", pattern_place);            \  
     DEBUG_PRINT_COMPILED_PATTERN (bufp, pattern_place, pend);           \  
     PUSH_FAILURE_POINTER (pattern_place);                               \  
                                                                         \  
     DEBUG_PRINT2 ("  Pushing string %p: `", string_place);              \  
     DEBUG_PRINT_DOUBLE_STRING (string_place, string1, size1, string2,   \  
                                  size2);                                \  
     DEBUG_PRINT1 ("'\n");                                               \  
     PUSH_FAILURE_POINTER (string_place);                                \  
                                                                         \  
     DEBUG_PRINT2 ("  Pushing failure id: %u\n", failure_id);            \  
     DEBUG_PUSH (failure_id);                                            \  
   } while (0)  
   
 # ifndef DEFINED_ONCE  
 /* This is the number of items that are pushed and popped on the stack  
    for each register.  */  
 #  define NUM_REG_ITEMS  3  
   
 /* Individual items aside from the registers.  */  
 #  ifdef DEBUG  
 #   define NUM_NONREG_ITEMS 5 /* Includes failure point id.  */  
 #  else  
 #   define NUM_NONREG_ITEMS 4  
 #  endif  
   
 /* We push at most this many items on the stack.  */  
 /* We used to use (num_regs - 1), which is the number of registers  
    this regexp will save; but that was changed to 5  
    to avoid stack overflow for a regexp with lots of parens.  */  
 #  define MAX_FAILURE_ITEMS (5 * NUM_REG_ITEMS + NUM_NONREG_ITEMS)  
   
 /* We actually push this many items.  */  
 #  define NUM_FAILURE_ITEMS                             \  
   (((0                                                  \  
      ? 0 : highest_active_reg - lowest_active_reg + 1)  \  
     * NUM_REG_ITEMS)                                    \  
    + NUM_NONREG_ITEMS)  
   
 /* How many items can still be added to the stack without overflowing it.  */  
 #  define REMAINING_AVAIL_SLOTS ((fail_stack).size - (fail_stack).avail)  
 # endif /* not DEFINED_ONCE */  
   
   
 /* Pops what PUSH_FAIL_STACK pushes.  
   
    We restore into the parameters, all of which should be lvalues:  
      STR -- the saved data position.  
      PAT -- the saved pattern position.  
      LOW_REG, HIGH_REG -- the highest and lowest active registers.  
      REGSTART, REGEND -- arrays of string positions.  
      REG_INFO -- array of information about each subexpression.  
   
    Also assumes the variables `fail_stack' and (if debugging), `bufp',  
    `pend', `string1', `size1', `string2', and `size2'.  */  
 # define POP_FAILURE_POINT(str, pat, low_reg, high_reg, regstart, regend, reg_info)\  
 {                                                                       \  
   DEBUG_STATEMENT (unsigned failure_id;)                                \  
   active_reg_t this_reg;                                                \  
   const UCHAR_T *string_temp;                                           \  
                                                                         \  
   assert (!FAIL_STACK_EMPTY ());                                        \  
                                                                         \  
   /* Remove failure points and point to how many regs pushed.  */       \  
   DEBUG_PRINT1 ("POP_FAILURE_POINT:\n");                                \  
   DEBUG_PRINT2 ("  Before pop, next avail: %d\n", fail_stack.avail);    \  
   DEBUG_PRINT2 ("                    size: %d\n", fail_stack.size);     \  
                                                                         \  
   assert (fail_stack.avail >= NUM_NONREG_ITEMS);                        \  
                                                                         \  
   DEBUG_POP (&failure_id);                                              \  
   DEBUG_PRINT2 ("  Popping failure id: %u\n", failure_id);              \  
                                                                         \  
   /* If the saved string location is NULL, it came from an              \  
      on_failure_keep_string_jump opcode, and we want to throw away the  \  
      saved NULL, thus retaining our current position in the string.  */ \  
   string_temp = POP_FAILURE_POINTER ();                                 \  
   if (string_temp != NULL)                                              \  
     str = (const CHAR_T *) string_temp;                                 \  
                                                                         \  
   DEBUG_PRINT2 ("  Popping string %p: `", str);                         \  
   DEBUG_PRINT_DOUBLE_STRING (str, string1, size1, string2, size2);      \  
   DEBUG_PRINT1 ("'\n");                                                 \  
                                                                         \  
   pat = (UCHAR_T *) POP_FAILURE_POINTER ();                             \  
   DEBUG_PRINT2 ("  Popping pattern %p:\n", pat);                        \  
   DEBUG_PRINT_COMPILED_PATTERN (bufp, pat, pend);                       \  
                                                                         \  
   /* Restore register info.  */                                         \  
   high_reg = (active_reg_t) POP_FAILURE_INT ();                         \  
   DEBUG_PRINT2 ("  Popping high active reg: %ld\n", high_reg);          \  
                                                                         \  
   low_reg = (active_reg_t) POP_FAILURE_INT ();                          \  
   DEBUG_PRINT2 ("  Popping  low active reg: %ld\n", low_reg);           \  
                                                                         \  
   if (1)                                                                \  
     for (this_reg = high_reg; this_reg >= low_reg; this_reg--)          \  
       {                                                                 \  
         DEBUG_PRINT2 ("    Popping reg: %ld\n", this_reg);              \  
                                                                         \  
         reg_info[this_reg].word = POP_FAILURE_ELT ();                   \  
         DEBUG_PRINT2 ("      info: %p\n",                               \  
                       reg_info[this_reg].word.pointer);                 \  
                                                                         \  
         regend[this_reg] = (const CHAR_T *) POP_FAILURE_POINTER ();     \  
         DEBUG_PRINT2 ("      end: %p\n", regend[this_reg]);             \  
                                                                         \  
         regstart[this_reg] = (const CHAR_T *) POP_FAILURE_POINTER ();   \  
         DEBUG_PRINT2 ("      start: %p\n", regstart[this_reg]);         \  
       }                                                                 \  
   else                                                                  \  
     {                                                                   \  
       for (this_reg = highest_active_reg; this_reg > high_reg; this_reg--) \  
         {                                                               \  
           reg_info[this_reg].word.integer = 0;                          \  
           regend[this_reg] = 0;                                         \  
           regstart[this_reg] = 0;                                       \  
         }                                                               \  
       highest_active_reg = high_reg;                                    \  
     }                                                                   \  
                                                                         \  
   set_regs_matched_done = 0;                                            \  
   DEBUG_STATEMENT (nfailure_points_popped++);                           \  
 } /* POP_FAILURE_POINT */  
   
 /* Structure for per-register (a.k.a. per-group) information.  
    Other register information, such as the  
    starting and ending positions (which are addresses), and the list of  
    inner groups (which is a bits list) are maintained in separate  
    variables.  
   
    We are making a (strictly speaking) nonportable assumption here: that  
    the compiler will pack our bit fields into something that fits into  
    the type of `word', i.e., is something that fits into one item on the  
    failure stack.  */  
   
   
 /* Declarations and macros for re_match_2.  */  
   
 typedef union  
 {  
   PREFIX(fail_stack_elt_t) word;  
   struct  
   {  
       /* This field is one if this group can match the empty string,  
          zero if not.  If not yet determined,  `MATCH_NULL_UNSET_VALUE'.  */  
 # define MATCH_NULL_UNSET_VALUE 3  
     unsigned match_null_string_p : 2;  
     unsigned is_active : 1;  
     unsigned matched_something : 1;  
     unsigned ever_matched_something : 1;  
   } bits;  
 } PREFIX(register_info_type);  
   
 # ifndef DEFINED_ONCE  
 #  define REG_MATCH_NULL_STRING_P(R)  ((R).bits.match_null_string_p)  
 #  define IS_ACTIVE(R)  ((R).bits.is_active)  
 #  define MATCHED_SOMETHING(R)  ((R).bits.matched_something)  
 #  define EVER_MATCHED_SOMETHING(R)  ((R).bits.ever_matched_something)  
   
   
 /* Call this when have matched a real character; it sets `matched' flags  
    for the subexpressions which we are currently inside.  Also records  
    that those subexprs have matched.  */  
 #  define SET_REGS_MATCHED()                                            \  
   do                                                                    \  
     {                                                                   \  
       if (!set_regs_matched_done)                                       \  
         {                                                               \  
           active_reg_t r;                                               \  
           set_regs_matched_done = 1;                                    \  
           for (r = lowest_active_reg; r <= highest_active_reg; r++)     \  
             {                                                           \  
               MATCHED_SOMETHING (reg_info[r])                           \  
                 = EVER_MATCHED_SOMETHING (reg_info[r])                  \  
                 = 1;                                                    \  
             }                                                           \  
         }                                                               \  
     }                                                                   \  
   while (0)  
 # endif /* not DEFINED_ONCE */  
   
 /* Registers are set to a sentinel when they haven't yet matched.  */  
 static CHAR_T PREFIX(reg_unset_dummy);  
 # define REG_UNSET_VALUE (&PREFIX(reg_unset_dummy))  
 # define REG_UNSET(e) ((e) == REG_UNSET_VALUE)  
   
 /* Subroutine declarations and macros for regex_compile.  */  
 static void PREFIX(store_op1) (re_opcode_t op, UCHAR_T *loc, int arg);  
 static void PREFIX(store_op2) (re_opcode_t op, UCHAR_T *loc,  
                                int arg1, int arg2);  
 static void PREFIX(insert_op1) (re_opcode_t op, UCHAR_T *loc,  
                                 int arg, UCHAR_T *end);  
 static void PREFIX(insert_op2) (re_opcode_t op, UCHAR_T *loc,  
                                 int arg1, int arg2, UCHAR_T *end);  
 static boolean PREFIX(at_begline_loc_p) (const CHAR_T *pattern,  
                                          const CHAR_T *p,  
                                          reg_syntax_t syntax);  
 static boolean PREFIX(at_endline_loc_p) (const CHAR_T *p,  
                                          const CHAR_T *pend,  
                                          reg_syntax_t syntax);  
 # ifdef WCHAR  
 static reg_errcode_t wcs_compile_range (CHAR_T range_start,  
                                         const CHAR_T **p_ptr,  
                                         const CHAR_T *pend,  
                                         char *translate,  
                                         reg_syntax_t syntax,  
                                         UCHAR_T *b,  
                                         CHAR_T *char_set);  
 static void insert_space (int num, CHAR_T *loc, CHAR_T *end);  
 # else /* BYTE */  
 static reg_errcode_t byte_compile_range (unsigned int range_start,  
                                          const char **p_ptr,  
                                          const char *pend,  
                                          char *translate,  
                                          reg_syntax_t syntax,  
                                          unsigned char *b);  
 # endif /* WCHAR */  
   
 /* Fetch the next character in the uncompiled pattern---translating it  
    if necessary.  Also cast from a signed character in the constant  
    string passed to us by the user to an unsigned char that we can use  
    as an array index (in, e.g., `translate').  */  
 /* ifdef MBS_SUPPORT, we translate only if character <= 0xff,  
    because it is impossible to allocate 4GB array for some encodings  
    which have 4 byte character_set like UCS4.  */  
 # ifndef PATFETCH  
 #  ifdef WCHAR  
 #   define PATFETCH(c)                                                  \  
   do {if (p == pend) return REG_EEND;                                   \  
     c = (UCHAR_T) *p++;                                                 \  
     if (translate && (c <= 0xff)) c = (UCHAR_T) translate[c];           \  
   } while (0)  
 #  else /* BYTE */  
 #   define PATFETCH(c)                                                  \  
   do {if (p == pend) return REG_EEND;                                   \  
     c = (unsigned char) *p++;                                           \  
     if (translate) c = (unsigned char) translate[c];                    \  
   } while (0)  
 #  endif /* WCHAR */  
 # endif  
   
 /* Fetch the next character in the uncompiled pattern, with no  
    translation.  */  
 # define PATFETCH_RAW(c)                                                \  
   do {if (p == pend) return REG_EEND;                                   \  
     c = (UCHAR_T) *p++;                                                 \  
   } while (0)  
   
 /* Go backwards one character in the pattern.  */  
 # define PATUNFETCH p--  
   
   
 /* If `translate' is non-null, return translate[D], else just D.  We  
    cast the subscript to translate because some data is declared as  
    `char *', to avoid warnings when a string constant is passed.  But  
    when we use a character as a subscript we must make it unsigned.  */  
 /* ifdef MBS_SUPPORT, we translate only if character <= 0xff,  
    because it is impossible to allocate 4GB array for some encodings  
    which have 4 byte character_set like UCS4.  */  
   
 # ifndef TRANSLATE  
 #  ifdef WCHAR  
 #   define TRANSLATE(d) \  
   ((translate && ((UCHAR_T) (d)) <= 0xff) \  
    ? (char) translate[(unsigned char) (d)] : (d))  
 # else /* BYTE */  
 #   define TRANSLATE(d) \  
   (translate ? (char) translate[(unsigned char) (d)] : (d))  
 #  endif /* WCHAR */  
 # endif  
   
   
 /* Macros for outputting the compiled pattern into `buffer'.  */  
   
 /* If the buffer isn't allocated when it comes in, use this.  */  
 # define INIT_BUF_SIZE  (32 * sizeof(UCHAR_T))  
   
 /* Make sure we have at least N more bytes of space in buffer.  */  
 # ifdef WCHAR  
 #  define GET_BUFFER_SPACE(n)                                           \  
     while (((unsigned long)b - (unsigned long)COMPILED_BUFFER_VAR       \  
             + (n)*sizeof(CHAR_T)) > bufp->allocated)                    \  
       EXTEND_BUFFER ()  
 # else /* BYTE */  
 #  define GET_BUFFER_SPACE(n)                                           \  
     while ((unsigned long) (b - bufp->buffer + (n)) > bufp->allocated)  \  
       EXTEND_BUFFER ()  
 # endif /* WCHAR */  
   
 /* Make sure we have one more byte of buffer space and then add C to it.  */  
 # define BUF_PUSH(c)                                                    \  
   do {                                                                  \  
     GET_BUFFER_SPACE (1);                                               \  
     *b++ = (UCHAR_T) (c);                                               \  
   } while (0)  
   
   
 /* Ensure we have two more bytes of buffer space and then append C1 and C2.  */  
 # define BUF_PUSH_2(c1, c2)                                             \  
   do {                                                                  \  
     GET_BUFFER_SPACE (2);                                               \  
     *b++ = (UCHAR_T) (c1);                                              \  
     *b++ = (UCHAR_T) (c2);                                              \  
   } while (0)  
   
   
 /* As with BUF_PUSH_2, except for three bytes.  */  
 # define BUF_PUSH_3(c1, c2, c3)                                         \  
   do {                                                                  \  
     GET_BUFFER_SPACE (3);                                               \  
     *b++ = (UCHAR_T) (c1);                                              \  
     *b++ = (UCHAR_T) (c2);                                              \  
     *b++ = (UCHAR_T) (c3);                                              \  
   } while (0)  
   
 /* Store a jump with opcode OP at LOC to location TO.  We store a  
    relative address offset by the three bytes the jump itself occupies.  */  
 # define STORE_JUMP(op, loc, to) \  
  PREFIX(store_op1) (op, loc, (int) ((to) - (loc) - (1 + OFFSET_ADDRESS_SIZE)))  
   
 /* Likewise, for a two-argument jump.  */  
 # define STORE_JUMP2(op, loc, to, arg) \  
   PREFIX(store_op2) (op, loc, (int) ((to) - (loc) - (1 + OFFSET_ADDRESS_SIZE)), arg)  
   
 /* Like `STORE_JUMP', but for inserting.  Assume `b' is the buffer end.  */  
 # define INSERT_JUMP(op, loc, to) \  
   PREFIX(insert_op1) (op, loc, (int) ((to) - (loc) - (1 + OFFSET_ADDRESS_SIZE)), b)  
   
 /* Like `STORE_JUMP2', but for inserting.  Assume `b' is the buffer end.  */  
 # define INSERT_JUMP2(op, loc, to, arg) \  
   PREFIX(insert_op2) (op, loc, (int) ((to) - (loc) - (1 + OFFSET_ADDRESS_SIZE)),\  
               arg, b)  
   
 /* This is not an arbitrary limit: the arguments which represent offsets  
    into the pattern are two bytes long.  So if 2^16 bytes turns out to  
    be too small, many things would have to change.  */  
 /* Any other compiler which, like MSC, has allocation limit below 2^16  
    bytes will have to use approach similar to what was done below for  
    MSC and drop MAX_BUF_SIZE a bit.  Otherwise you may end up  
    reallocating to 0 bytes.  Such thing is not going to work too well.  
    You have been warned!!  */  
 # ifndef DEFINED_ONCE  
 #  if defined _MSC_VER  && !defined WIN32  
 /* Microsoft C 16-bit versions limit malloc to approx 65512 bytes.  
    The REALLOC define eliminates a flurry of conversion warnings,  
    but is not required. */  
 #   define MAX_BUF_SIZE  65500L  
 #   define REALLOC(p,s) realloc ((p), (size_t) (s))  
 #  else  
 #   define MAX_BUF_SIZE (1L << 16)  
 #   define REALLOC(p,s) realloc ((p), (s))  
 #  endif  
   
 /* Extend the buffer by twice its current size via realloc and  
    reset the pointers that pointed into the old block to point to the  
    correct places in the new one.  If extending the buffer results in it  
    being larger than MAX_BUF_SIZE, then flag memory exhausted.  */  
 #  if __BOUNDED_POINTERS__  
 #   define SET_HIGH_BOUND(P) (__ptrhigh (P) = __ptrlow (P) + bufp->allocated)  
 #   define MOVE_BUFFER_POINTER(P) \  
   (__ptrlow (P) += incr, SET_HIGH_BOUND (P), __ptrvalue (P) += incr)  
 #   define ELSE_EXTEND_BUFFER_HIGH_BOUND        \  
   else                                          \  
     {                                           \  
       SET_HIGH_BOUND (b);                       \  
       SET_HIGH_BOUND (begalt);                  \  
       if (fixup_alt_jump)                       \  
         SET_HIGH_BOUND (fixup_alt_jump);        \  
       if (laststart)                            \  
         SET_HIGH_BOUND (laststart);             \  
       if (pending_exact)                        \  
         SET_HIGH_BOUND (pending_exact);         \  
     }  
 #  else  
 #   define MOVE_BUFFER_POINTER(P) (P) += incr  
 #   define ELSE_EXTEND_BUFFER_HIGH_BOUND  
 #  endif  
 # endif /* not DEFINED_ONCE */  
   
 # ifdef WCHAR  
 #  define EXTEND_BUFFER()                                               \  
   do {                                                                  \  
     UCHAR_T *old_buffer = COMPILED_BUFFER_VAR;                          \  
     int wchar_count;                                                    \  
     if (bufp->allocated + sizeof(UCHAR_T) > MAX_BUF_SIZE)               \  
       return REG_ESIZE;                                                 \  
     bufp->allocated <<= 1;                                              \  
     if (bufp->allocated > MAX_BUF_SIZE)                                 \  
       bufp->allocated = MAX_BUF_SIZE;                                   \  
     /* How many characters the new buffer can have?  */                 \  
     wchar_count = bufp->allocated / sizeof(UCHAR_T);                    \  
     if (wchar_count == 0) wchar_count = 1;                              \  
     /* Truncate the buffer to CHAR_T align.  */                 \  
     bufp->allocated = wchar_count * sizeof(UCHAR_T);                    \  
     RETALLOC (COMPILED_BUFFER_VAR, wchar_count, UCHAR_T);               \  
     bufp->buffer = (char*)COMPILED_BUFFER_VAR;                          \  
     if (COMPILED_BUFFER_VAR == NULL)                                    \  
       return REG_ESPACE;                                                \  
     /* If the buffer moved, move all the pointers into it.  */          \  
     if (old_buffer != COMPILED_BUFFER_VAR)                              \  
       {                                                                 \  
         int incr = COMPILED_BUFFER_VAR - old_buffer;                    \  
         MOVE_BUFFER_POINTER (b);                                        \  
         MOVE_BUFFER_POINTER (begalt);                                   \  
         if (fixup_alt_jump)                                             \  
           MOVE_BUFFER_POINTER (fixup_alt_jump);                         \  
         if (laststart)                                                  \  
           MOVE_BUFFER_POINTER (laststart);                              \  
         if (pending_exact)                                              \  
           MOVE_BUFFER_POINTER (pending_exact);                          \  
       }                                                                 \  
     ELSE_EXTEND_BUFFER_HIGH_BOUND                                       \  
   } while (0)  
 # else /* BYTE */  
 #  define EXTEND_BUFFER()                                               \  
   do {                                                                  \  
     UCHAR_T *old_buffer = COMPILED_BUFFER_VAR;                          \  
     if (bufp->allocated == MAX_BUF_SIZE)                                \  
       return REG_ESIZE;                                                 \  
     bufp->allocated <<= 1;                                              \  
     if (bufp->allocated > MAX_BUF_SIZE)                                 \  
       bufp->allocated = MAX_BUF_SIZE;                                   \  
     bufp->buffer                                                        \  
       = (UCHAR_T *) REALLOC (COMPILED_BUFFER_VAR, bufp->allocated);     \  
     if (COMPILED_BUFFER_VAR == NULL)                                    \  
       return REG_ESPACE;                                                \  
     /* If the buffer moved, move all the pointers into it.  */          \  
     if (old_buffer != COMPILED_BUFFER_VAR)                              \  
       {                                                                 \  
         int incr = COMPILED_BUFFER_VAR - old_buffer;                    \  
         MOVE_BUFFER_POINTER (b);                                        \  
         MOVE_BUFFER_POINTER (begalt);                                   \  
         if (fixup_alt_jump)                                             \  
           MOVE_BUFFER_POINTER (fixup_alt_jump);                         \  
         if (laststart)                                                  \  
           MOVE_BUFFER_POINTER (laststart);                              \  
         if (pending_exact)                                              \  
           MOVE_BUFFER_POINTER (pending_exact);                          \  
       }                                                                 \  
     ELSE_EXTEND_BUFFER_HIGH_BOUND                                       \  
   } while (0)  
 # endif /* WCHAR */  
   
 # ifndef DEFINED_ONCE  
 /* Since we have one byte reserved for the register number argument to  
    {start,stop}_memory, the maximum number of groups we can report  
    things about is what fits in that byte.  */  
 #  define MAX_REGNUM 255  
   
 /* But patterns can have more than `MAX_REGNUM' registers.  We just  
    ignore the excess.  */  
 typedef unsigned regnum_t;  
   
   
 /* Macros for the compile stack.  */  
   
 /* Since offsets can go either forwards or backwards, this type needs to  
    be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1.  */  
 /* int may be not enough when sizeof(int) == 2.  */  
 typedef long pattern_offset_t;  
   
 typedef struct  
 {  
   pattern_offset_t begalt_offset;  
   pattern_offset_t fixup_alt_jump;  
   pattern_offset_t inner_group_offset;  
   pattern_offset_t laststart_offset;  
   regnum_t regnum;  
 } compile_stack_elt_t;  
   
   
 typedef struct  
 {  
   compile_stack_elt_t *stack;  
   unsigned size;  
   unsigned avail;                       /* Offset of next open position.  */  
 } compile_stack_type;  
   
   
 #  define INIT_COMPILE_STACK_SIZE 32  
   
 #  define COMPILE_STACK_EMPTY  (compile_stack.avail == 0)  
 #  define COMPILE_STACK_FULL  (compile_stack.avail == compile_stack.size)  
   
 /* The next available element.  */  
 #  define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail])  
   
 # endif /* not DEFINED_ONCE */  
   
 /* Set the bit for character C in a list.  */  
 # ifndef DEFINED_ONCE  
 #  define SET_LIST_BIT(c)                               \  
   (b[((unsigned char) (c)) / BYTEWIDTH]               \  
    |= 1 << (((unsigned char) c) % BYTEWIDTH))  
 # endif /* DEFINED_ONCE */  
   
 /* Get the next unsigned number in the uncompiled pattern.  */  
 # define GET_UNSIGNED_NUMBER(num) \  
   {                                                                     \  
     while (p != pend)                                                   \  
       {                                                                 \  
         PATFETCH (c);                                                   \  
         if (c < '0' || c > '9')                                         \  
           break;                                                        \  
         if (num <= RE_DUP_MAX)                                          \  
           {                                                             \  
             if (num < 0)                                                \  
               num = 0;                                                  \  
             num = num * 10 + c - '0';                                   \  
           }                                                             \  
       }                                                                 \  
   }  
   
 # ifndef DEFINED_ONCE  
 #  if defined _LIBC || WIDE_CHAR_SUPPORT  
 /* The GNU C library provides support for user-defined character classes  
    and the functions from ISO C amendement 1.  */  
 #   ifdef CHARCLASS_NAME_MAX  
 #    define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX  
 #   else  
 /* This shouldn't happen but some implementation might still have this  
    problem.  Use a reasonable default value.  */  
 #    define CHAR_CLASS_MAX_LENGTH 256  
 #   endif  
   
 #   ifdef _LIBC  
 #    define IS_CHAR_CLASS(string) __wctype (string)  
 #   else  
 #    define IS_CHAR_CLASS(string) wctype (string)  
 #   endif  
 #  else  
 #   define CHAR_CLASS_MAX_LENGTH  6 /* Namely, `xdigit'.  */  
   
 #   define IS_CHAR_CLASS(string)                                        \  
    (STREQ (string, "alpha") || STREQ (string, "upper")                  \  
     || STREQ (string, "lower") || STREQ (string, "digit")               \  
     || STREQ (string, "alnum") || STREQ (string, "xdigit")              \  
     || STREQ (string, "space") || STREQ (string, "print")               \  
     || STREQ (string, "punct") || STREQ (string, "graph")               \  
     || STREQ (string, "cntrl") || STREQ (string, "blank"))  
 #  endif  
 # endif /* DEFINED_ONCE */  
   
 # ifndef MATCH_MAY_ALLOCATE  
   
 /* If we cannot allocate large objects within re_match_2_internal,  
    we make the fail stack and register vectors global.  
    The fail stack, we grow to the maximum size when a regexp  
    is compiled.  
    The register vectors, we adjust in size each time we  
    compile a regexp, according to the number of registers it needs.  */  
   
 static PREFIX(fail_stack_type) fail_stack;  
   
 /* Size with which the following vectors are currently allocated.  
    That is so we can make them bigger as needed,  
    but never make them smaller.  */  
 #  ifdef DEFINED_ONCE  
 static int regs_allocated_size;  
   
 static const char **     regstart, **     regend;  
 static const char ** old_regstart, ** old_regend;  
 static const char **best_regstart, **best_regend;  
 static const char **reg_dummy;  
 #  endif /* DEFINED_ONCE */  
   
 static PREFIX(register_info_type) *PREFIX(reg_info);  
 static PREFIX(register_info_type) *PREFIX(reg_info_dummy);  
   
 /* Make the register vectors big enough for NUM_REGS registers,  
    but don't make them smaller.  */  
   
 static void  
 PREFIX(regex_grow_registers) (int num_regs)  
 {  
   if (num_regs > regs_allocated_size)  
     {  
       RETALLOC_IF (regstart,     num_regs, const char *);  
       RETALLOC_IF (regend,       num_regs, const char *);  
       RETALLOC_IF (old_regstart, num_regs, const char *);  
       RETALLOC_IF (old_regend,   num_regs, const char *);  
       RETALLOC_IF (best_regstart, num_regs, const char *);  
       RETALLOC_IF (best_regend,  num_regs, const char *);  
       RETALLOC_IF (PREFIX(reg_info), num_regs, PREFIX(register_info_type));  
       RETALLOC_IF (reg_dummy,    num_regs, const char *);  
       RETALLOC_IF (PREFIX(reg_info_dummy), num_regs, PREFIX(register_info_type));  
   
       regs_allocated_size = num_regs;  
     }  
 }  
   
 # endif /* not MATCH_MAY_ALLOCATE */  
   
 # ifndef DEFINED_ONCE  
 static boolean group_in_compile_stack (compile_stack_type  
                                        compile_stack,  
                                        regnum_t regnum);  
 # endif /* not DEFINED_ONCE */  
   
 /* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX.  
    Returns one of error codes defined in `regex.h', or zero for success.  
   
    Assumes the `allocated' (and perhaps `buffer') and `translate'  
    fields are set in BUFP on entry.  
   
    If it succeeds, results are put in BUFP (if it returns an error, the  
    contents of BUFP are undefined):  
      `buffer' is the compiled pattern;  
      `syntax' is set to SYNTAX;  
      `used' is set to the length of the compiled pattern;  
      `fastmap_accurate' is zero;  
      `re_nsub' is the number of subexpressions in PATTERN;  
      `not_bol' and `not_eol' are zero;  
   
    The `fastmap' and `newline_anchor' fields are neither  
    examined nor set.  */  
   
 /* Return, freeing storage we allocated.  */  
 # ifdef WCHAR  
 #  define FREE_STACK_RETURN(value)              \  
   return (free(pattern), free(mbs_offset), free(is_binary), free (compile_stack.stack), value)  
 # else  
 #  define FREE_STACK_RETURN(value)              \  
   return (free (compile_stack.stack), value)  
 # endif /* WCHAR */  
   
 static reg_errcode_t  
 PREFIX(regex_compile) (const char *ARG_PREFIX(pattern),  
                        size_t ARG_PREFIX(size),  
                        reg_syntax_t syntax,  
                        struct re_pattern_buffer *bufp)  
 {  
   /* We fetch characters from PATTERN here.  Even though PATTERN is  
      `char *' (i.e., signed), we declare these variables as unsigned, so  
      they can be reliably used as array indices.  */  
   register UCHAR_T c, c1;  
   
 #ifdef WCHAR  
   /* A temporary space to keep wchar_t pattern and compiled pattern.  */  
   CHAR_T *pattern, *COMPILED_BUFFER_VAR;  
   size_t size;  
   /* offset buffer for optimization. See convert_mbs_to_wc.  */  
   int *mbs_offset = NULL;  
   /* It hold whether each wchar_t is binary data or not.  */  
   char *is_binary = NULL;  
   /* A flag whether exactn is handling binary data or not.  */  
   char is_exactn_bin = FALSE;  
 #endif /* WCHAR */  
   
   /* A random temporary spot in PATTERN.  */  
   const CHAR_T *p1;  
   
   /* Points to the end of the buffer, where we should append.  */  
   register UCHAR_T *b;  
   
   /* Keeps track of unclosed groups.  */  
   compile_stack_type compile_stack;  
   
   /* Points to the current (ending) position in the pattern.  */  
 #ifdef WCHAR  
   const CHAR_T *p;  
   const CHAR_T *pend;  
 #else /* BYTE */  
   const CHAR_T *p = pattern;  
   const CHAR_T *pend = pattern + size;  
 #endif /* WCHAR */  
   
   /* How to translate the characters in the pattern.  */  
   RE_TRANSLATE_TYPE translate = bufp->translate;  
   
   /* Address of the count-byte of the most recently inserted `exactn'  
      command.  This makes it possible to tell if a new exact-match  
      character can be added to that command or if the character requires  
      a new `exactn' command.  */  
   UCHAR_T *pending_exact = 0;  
   
   /* Address of start of the most recently finished expression.  
      This tells, e.g., postfix * where to find the start of its  
      operand.  Reset at the beginning of groups and alternatives.  */  
   UCHAR_T *laststart = 0;  
   
   /* Address of beginning of regexp, or inside of last group.  */  
   UCHAR_T *begalt;  
   
   /* Address of the place where a forward jump should go to the end of  
      the containing expression.  Each alternative of an `or' -- except the  
      last -- ends with a forward jump of this sort.  */  
   UCHAR_T *fixup_alt_jump = 0;  
   
   /* Counts open-groups as they are encountered.  Remembered for the  
      matching close-group on the compile stack, so the same register  
      number is put in the stop_memory as the start_memory.  */  
   regnum_t regnum = 0;  
   
 #ifdef WCHAR  
   /* Initialize the wchar_t PATTERN and offset_buffer.  */  
   p = pend = pattern = TALLOC(csize + 1, CHAR_T);  
   mbs_offset = TALLOC(csize + 1, int);  
   is_binary = TALLOC(csize + 1, char);  
   if (pattern == NULL || mbs_offset == NULL || is_binary == NULL)  
     {  
       free(pattern);  
       free(mbs_offset);  
       free(is_binary);  
       return REG_ESPACE;  
     }  
   pattern[csize] = L'\0';       /* sentinel */  
   size = convert_mbs_to_wcs(pattern, cpattern, csize, mbs_offset, is_binary);  
   pend = p + size;  
   if (size < 0)  
     {  
       free(pattern);  
       free(mbs_offset);  
       free(is_binary);  
       return REG_BADPAT;  
     }  
 #endif  
   
 #ifdef DEBUG  
   DEBUG_PRINT1 ("\nCompiling pattern: ");  
   if (debug)  
     {  
       unsigned debug_count;  
   
       for (debug_count = 0; debug_count < size; debug_count++)  
         PUT_CHAR (pattern[debug_count]);  
       putchar ('\n');  
     }  
 #endif /* DEBUG */  
   
   /* Initialize the compile stack.  */  
   compile_stack.stack = TALLOC (INIT_COMPILE_STACK_SIZE, compile_stack_elt_t);  
   if (compile_stack.stack == NULL)  
     {  
 #ifdef WCHAR  
       free(pattern);  
       free(mbs_offset);  
       free(is_binary);  
 #endif  
       return REG_ESPACE;  
     }  
   
   compile_stack.size = INIT_COMPILE_STACK_SIZE;  
   compile_stack.avail = 0;  
   
   /* Initialize the pattern buffer.  */  
   bufp->syntax = syntax;  
   bufp->fastmap_accurate = 0;  
   bufp->not_bol = bufp->not_eol = 0;  
   
   /* Set `used' to zero, so that if we return an error, the pattern  
      printer (for debugging) will think there's no pattern.  We reset it  
      at the end.  */  
   bufp->used = 0;  
   
   /* Always count groups, whether or not bufp->no_sub is set.  */  
   bufp->re_nsub = 0;  
   
 #if !defined emacs && !defined SYNTAX_TABLE  
   /* Initialize the syntax table.  */  
    init_syntax_once ();  
 #endif  
   
   if (bufp->allocated == 0)  
     {  
       if (bufp->buffer)  
         { /* If zero allocated, but buffer is non-null, try to realloc  
              enough space.  This loses if buffer's address is bogus, but  
              that is the user's responsibility.  */  
 #ifdef WCHAR  
           /* Free bufp->buffer and allocate an array for wchar_t pattern  
              buffer.  */  
           free(bufp->buffer);  
           COMPILED_BUFFER_VAR = TALLOC (INIT_BUF_SIZE/sizeof(UCHAR_T),  
                                         UCHAR_T);  
 #else  
           RETALLOC (COMPILED_BUFFER_VAR, INIT_BUF_SIZE, UCHAR_T);  
 #endif /* WCHAR */  
         }  
       else  
         { /* Caller did not allocate a buffer.  Do it for them.  */  
           COMPILED_BUFFER_VAR = TALLOC (INIT_BUF_SIZE / sizeof(UCHAR_T),  
                                         UCHAR_T);  
         }  
   
       if (!COMPILED_BUFFER_VAR) FREE_STACK_RETURN (REG_ESPACE);  
 #ifdef WCHAR  
       bufp->buffer = (char*)COMPILED_BUFFER_VAR;  
 #endif /* WCHAR */  
       bufp->allocated = INIT_BUF_SIZE;  
     }  
 #ifdef WCHAR  
   else  
     COMPILED_BUFFER_VAR = (UCHAR_T*) bufp->buffer;  
 #endif  
   
   begalt = b = COMPILED_BUFFER_VAR;  
   
   /* Loop through the uncompiled pattern until we're at the end.  */  
   while (p != pend)  
     {  
       PATFETCH (c);  
   
       switch (c)  
         {  
         case '^':  
           {  
             if (   /* If at start of pattern, it's an operator.  */  
                    p == pattern + 1  
                    /* If context independent, it's an operator.  */  
                 || syntax & RE_CONTEXT_INDEP_ANCHORS  
                    /* Otherwise, depends on what's come before.  */  
                 || PREFIX(at_begline_loc_p) (pattern, p, syntax))  
               BUF_PUSH (begline);  
             else  
               goto normal_char;  
           }  
           break;  
   
   
         case '$':  
           {  
             if (   /* If at end of pattern, it's an operator.  */  
                    p == pend  
                    /* If context independent, it's an operator.  */  
                 || syntax & RE_CONTEXT_INDEP_ANCHORS  
                    /* Otherwise, depends on what's next.  */  
                 || PREFIX(at_endline_loc_p) (p, pend, syntax))  
                BUF_PUSH (endline);  
              else  
                goto normal_char;  
            }  
            break;  
   
   
         case '+':  
         case '?':  
           if ((syntax & RE_BK_PLUS_QM)  
               || (syntax & RE_LIMITED_OPS))  
             goto normal_char;  
         handle_plus:  
         case '*':  
           /* If there is no previous pattern... */  
           if (!laststart)  
             {  
               if (syntax & RE_CONTEXT_INVALID_OPS)  
                 FREE_STACK_RETURN (REG_BADRPT);  
               else if (!(syntax & RE_CONTEXT_INDEP_OPS))  
                 goto normal_char;  
             }  
   
           {  
             /* Are we optimizing this jump?  */  
             boolean keep_string_p = false;  
   
             /* 1 means zero (many) matches is allowed.  */  
             char zero_times_ok = 0, many_times_ok = 0;  
   
             /* If there is a sequence of repetition chars, collapse it  
                down to just one (the right one).  We can't combine  
                interval operators with these because of, e.g., `a{2}*',  
                which should only match an even number of `a's.  */  
   
             for (;;)  
               {  
                 zero_times_ok |= c != '+';  
                 many_times_ok |= c != '?';  
   
                 if (p == pend)  
                   break;  
   
                 PATFETCH (c);  
   
                 if (c == '*'  
                     || (!(syntax & RE_BK_PLUS_QM) && (c == '+' || c == '?')))  
                   ;  
   
                 else if (syntax & RE_BK_PLUS_QM  &&  c == '\\')  
                   {  
                     if (p == pend) FREE_STACK_RETURN (REG_EESCAPE);  
   
                     PATFETCH (c1);  
                     if (!(c1 == '+' || c1 == '?'))  
                       {  
                         PATUNFETCH;  
                         PATUNFETCH;  
                         break;  
                       }  
   
                     c = c1;  
                   }  
                 else  
                   {  
                     PATUNFETCH;  
                     break;  
                   }  
   
                 /* If we get here, we found another repeat character.  */  
                }  
   
             /* Star, etc. applied to an empty pattern is equivalent  
                to an empty pattern.  */  
             if (!laststart)  
               break;  
   
             /* Now we know whether or not zero matches is allowed  
                and also whether or not two or more matches is allowed.  */  
             if (many_times_ok)  
               { /* More than one repetition is allowed, so put in at the  
                    end a backward relative jump from `b' to before the next  
                    jump we're going to put in below (which jumps from  
                    laststart to after this jump).  
   
                    But if we are at the `*' in the exact sequence `.*\n',  
                    insert an unconditional jump backwards to the .,  
                    instead of the beginning of the loop.  This way we only  
                    push a failure point once, instead of every time  
                    through the loop.  */  
                 assert (p - 1 > pattern);  
   
                 /* Allocate the space for the jump.  */  
                 GET_BUFFER_SPACE (1 + OFFSET_ADDRESS_SIZE);  
   
                 /* We know we are not at the first character of the pattern,  
                    because laststart was nonzero.  And we've already  
                    incremented `p', by the way, to be the character after  
                    the `*'.  Do we have to do something analogous here  
                    for null bytes, because of RE_DOT_NOT_NULL?  */  
                 if (TRANSLATE (*(p - 2)) == TRANSLATE ('.')  
                     && zero_times_ok  
                     && p < pend && TRANSLATE (*p) == TRANSLATE ('\n')  
                     && !(syntax & RE_DOT_NEWLINE))  
                   { /* We have .*\n.  */  
                     STORE_JUMP (jump, b, laststart);  
                     keep_string_p = true;  
                   }  
                 else  
                   /* Anything else.  */  
                   STORE_JUMP (maybe_pop_jump, b, laststart -  
                               (1 + OFFSET_ADDRESS_SIZE));  
   
                 /* We've added more stuff to the buffer.  */  
                 b += 1 + OFFSET_ADDRESS_SIZE;  
               }  
   
             /* On failure, jump from laststart to b + 3, which will be the  
                end of the buffer after this jump is inserted.  */  
             /* ifdef WCHAR, 'b + 1 + OFFSET_ADDRESS_SIZE' instead of  
                'b + 3'.  */  
             GET_BUFFER_SPACE (1 + OFFSET_ADDRESS_SIZE);  
             INSERT_JUMP (keep_string_p ? on_failure_keep_string_jump  
                                        : on_failure_jump,  
                          laststart, b + 1 + OFFSET_ADDRESS_SIZE);  
             pending_exact = 0;  
             b += 1 + OFFSET_ADDRESS_SIZE;  
   
             if (!zero_times_ok)  
               {  
                 /* At least one repetition is required, so insert a  
                    `dummy_failure_jump' before the initial  
                    `on_failure_jump' instruction of the loop. This  
                    effects a skip over that instruction the first time  
                    we hit that loop.  */  
                 GET_BUFFER_SPACE (1 + OFFSET_ADDRESS_SIZE);  
                 INSERT_JUMP (dummy_failure_jump, laststart, laststart +  
                              2 + 2 * OFFSET_ADDRESS_SIZE);  
                 b += 1 + OFFSET_ADDRESS_SIZE;  
               }  
             }  
           break;  
   
   
         case '.':  
           laststart = b;  
           BUF_PUSH (anychar);  
           break;  
   
   
         case '[':  
           {  
             boolean had_char_class = false;  
 #ifdef WCHAR  
             CHAR_T range_start = 0xffffffff;  
 #else  
             unsigned int range_start = 0xffffffff;  
 #endif  
             if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
 #ifdef WCHAR  
             /* We assume a charset(_not) structure as a wchar_t array.  
                charset[0] = (re_opcode_t) charset(_not)  
                charset[1] = l (= length of char_classes)  
                charset[2] = m (= length of collating_symbols)  
                charset[3] = n (= length of equivalence_classes)  
                charset[4] = o (= length of char_ranges)  
                charset[5] = p (= length of chars)  
   
                charset[6] = char_class (wctype_t)  
                charset[6+CHAR_CLASS_SIZE] = char_class (wctype_t)  
                          ...  
                charset[l+5]  = char_class (wctype_t)  
   
                charset[l+6]  = collating_symbol (wchar_t)  
                             ...  
                charset[l+m+5]  = collating_symbol (wchar_t)  
                                         ifdef _LIBC we use the index if  
                                         _NL_COLLATE_SYMB_EXTRAMB instead of  
                                         wchar_t string.  
   
                charset[l+m+6]  = equivalence_classes (wchar_t)  
                               ...  
                charset[l+m+n+5]  = equivalence_classes (wchar_t)  
                                         ifdef _LIBC we use the index in  
                                         _NL_COLLATE_WEIGHT instead of  
                                         wchar_t string.  
   
                charset[l+m+n+6] = range_start  
                charset[l+m+n+7] = range_end  
                                ...  
                charset[l+m+n+2o+4] = range_start  
                charset[l+m+n+2o+5] = range_end  
                                         ifdef _LIBC we use the value looked up  
                                         in _NL_COLLATE_COLLSEQ instead of  
                                         wchar_t character.  
   
                charset[l+m+n+2o+6] = char  
                                   ...  
                charset[l+m+n+2o+p+5] = char  
   
              */  
   
             /* We need at least 6 spaces: the opcode, the length of  
                char_classes, the length of collating_symbols, the length of  
                equivalence_classes, the length of char_ranges, the length of  
                chars.  */  
             GET_BUFFER_SPACE (6);  
   
             /* Save b as laststart. And We use laststart as the pointer  
                to the first element of the charset here.  
                In other words, laststart[i] indicates charset[i].  */  
             laststart = b;  
   
             /* We test `*p == '^' twice, instead of using an if  
                statement, so we only need one BUF_PUSH.  */  
             BUF_PUSH (*p == '^' ? charset_not : charset);  
             if (*p == '^')  
               p++;  
   
             /* Push the length of char_classes, the length of  
                collating_symbols, the length of equivalence_classes, the  
                length of char_ranges and the length of chars.  */  
             BUF_PUSH_3 (0, 0, 0);  
             BUF_PUSH_2 (0, 0);  
   
             /* Remember the first position in the bracket expression.  */  
             p1 = p;  
   
             /* charset_not matches newline according to a syntax bit.  */  
             if ((re_opcode_t) b[-6] == charset_not  
                 && (syntax & RE_HAT_LISTS_NOT_NEWLINE))  
               {  
                 BUF_PUSH('\n');  
                 laststart[5]++; /* Update the length of characters  */  
               }  
   
             /* Read in characters and ranges, setting map bits.  */  
             for (;;)  
               {  
                 if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                 PATFETCH (c);  
   
                 /* \ might escape characters inside [...] and [^...].  */  
                 if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\')  
                   {  
                     if (p == pend) FREE_STACK_RETURN (REG_EESCAPE);  
   
                     PATFETCH (c1);  
                     BUF_PUSH(c1);  
                     laststart[5]++; /* Update the length of chars  */  
                     range_start = c1;  
                     continue;  
                   }  
   
                 /* Could be the end of the bracket expression.  If it's  
                    not (i.e., when the bracket expression is `[]' so  
                    far), the ']' character bit gets set way below.  */  
                 if (c == ']' && p != p1 + 1)  
                   break;  
   
                 /* Look ahead to see if it's a range when the last thing  
                    was a character class.  */  
                 if (had_char_class && c == '-' && *p != ']')  
                   FREE_STACK_RETURN (REG_ERANGE);  
   
                 /* Look ahead to see if it's a range when the last thing  
                    was a character: if this is a hyphen not at the  
                    beginning or the end of a list, then it's the range  
                    operator.  */  
                 if (c == '-'  
                     && !(p - 2 >= pattern && p[-2] == '[')  
                     && !(p - 3 >= pattern && p[-3] == '[' && p[-2] == '^')  
                     && *p != ']')  
                   {  
                     reg_errcode_t ret;  
                     /* Allocate the space for range_start and range_end.  */  
                     GET_BUFFER_SPACE (2);  
                     /* Update the pointer to indicate end of buffer.  */  
                     b += 2;  
                     ret = wcs_compile_range (range_start, &p, pend, translate,  
                                          syntax, b, laststart);  
                     if (ret != REG_NOERROR) FREE_STACK_RETURN (ret);  
                     range_start = 0xffffffff;  
                   }  
                 else if (p[0] == '-' && p[1] != ']')  
                   { /* This handles ranges made up of characters only.  */  
                     reg_errcode_t ret;  
   
                     /* Move past the `-'.  */  
                     PATFETCH (c1);  
                     /* Allocate the space for range_start and range_end.  */  
                     GET_BUFFER_SPACE (2);  
                     /* Update the pointer to indicate end of buffer.  */  
                     b += 2;  
                     ret = wcs_compile_range (c, &p, pend, translate, syntax, b,  
                                          laststart);  
                     if (ret != REG_NOERROR) FREE_STACK_RETURN (ret);  
                     range_start = 0xffffffff;  
                   }  
   
                 /* See if we're at the beginning of a possible character  
                    class.  */  
                 else if (syntax & RE_CHAR_CLASSES && c == '[' && *p == ':')  
                   { /* Leave room for the null.  */  
                     char str[CHAR_CLASS_MAX_LENGTH + 1];  
   
                     PATFETCH (c);  
                     c1 = 0;  
   
                     /* If pattern is `[[:'.  */  
                     if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                     for (;;)  
                       {  
                         PATFETCH (c);  
                         if ((c == ':' && *p == ']') || p == pend)  
                           break;  
                         if (c1 < CHAR_CLASS_MAX_LENGTH)  
                           str[c1++] = c;  
                         else  
                           /* This is in any case an invalid class name.  */  
                           str[0] = '\0';  
                       }  
                     str[c1] = '\0';  
   
                     /* If isn't a word bracketed by `[:' and `:]':  
                        undo the ending character, the letters, and leave  
                        the leading `:' and `[' (but store them as character).  */  
                     if (c == ':' && *p == ']')  
                       {  
                         wctype_t wt;  
                         uintptr_t alignedp;  
   
                         /* Query the character class as wctype_t.  */  
                         wt = IS_CHAR_CLASS (str);  
                         if (wt == 0)  
                           FREE_STACK_RETURN (REG_ECTYPE);  
   
                         /* Throw away the ] at the end of the character  
                            class.  */  
                         PATFETCH (c);  
   
                         if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                         /* Allocate the space for character class.  */  
                         GET_BUFFER_SPACE(CHAR_CLASS_SIZE);  
                         /* Update the pointer to indicate end of buffer.  */  
                         b += CHAR_CLASS_SIZE;  
                         /* Move data which follow character classes  
                             not to violate the data.  */  
                         insert_space(CHAR_CLASS_SIZE,  
                                      laststart + 6 + laststart[1],  
                                      b - 1);  
                         alignedp = ((uintptr_t)(laststart + 6 + laststart[1])  
                                     + __alignof__(wctype_t) - 1)  
                                     & ~(uintptr_t)(__alignof__(wctype_t) - 1);  
                         /* Store the character class.  */  
                         *((wctype_t*)alignedp) = wt;  
                         /* Update length of char_classes */  
                         laststart[1] += CHAR_CLASS_SIZE;  
   
                         had_char_class = true;  
                       }  
                     else  
                       {  
                         c1++;  
                         while (c1--)  
                           PATUNFETCH;  
                         BUF_PUSH ('[');  
                         BUF_PUSH (':');  
                         laststart[5] += 2; /* Update the length of characters  */  
                         range_start = ':';  
                         had_char_class = false;  
                       }  
                   }  
                 else if (syntax & RE_CHAR_CLASSES && c == '[' && (*p == '='  
                                                           || *p == '.'))  
                   {  
                     CHAR_T str[128];    /* Should be large enough.  */  
                     CHAR_T delim = *p; /* '=' or '.'  */  
 # ifdef _LIBC  
                     uint32_t nrules =  
                       _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);  
 # endif  
                     PATFETCH (c);  
                     c1 = 0;  
   
                     /* If pattern is `[[=' or '[[.'.  */  
                     if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                     for (;;)  
                       {  
                         PATFETCH (c);  
                         if ((c == delim && *p == ']') || p == pend)  
                           break;  
                         if (c1 < sizeof (str) - 1)  
                           str[c1++] = c;  
                         else  
                           /* This is in any case an invalid class name.  */  
                           str[0] = '\0';  
                       }  
                     str[c1] = '\0';  
   
                     if (c == delim && *p == ']' && str[0] != '\0')  
                       {  
                         unsigned int i, offset;  
                         /* If we have no collation data we use the default  
                            collation in which each character is in a class  
                            by itself.  It also means that ASCII is the  
                            character set and therefore we cannot have character  
                            with more than one byte in the multibyte  
                            representation.  */  
   
                         /* If not defined _LIBC, we push the name and  
                            `\0' for the sake of matching performance.  */  
                         int datasize = c1 + 1;  
   
 # ifdef _LIBC  
                         int32_t idx = 0;  
                         if (nrules == 0)  
 # endif  
                           {  
                             if (c1 != 1)  
                               FREE_STACK_RETURN (REG_ECOLLATE);  
                           }  
 # ifdef _LIBC  
                         else  
                           {  
                             const int32_t *table;  
                             const int32_t *weights;  
                             const int32_t *extra;  
                             const int32_t *indirect;  
                             wint_t *cp;  
   
                             /* This #include defines a local function!  */  
 #  include <locale/weightwc.h>  
   
                             if(delim == '=')  
                               {  
                                 /* We push the index for equivalence class.  */  
                                 cp = (wint_t*)str;  
   
                                 table = (const int32_t *)  
                                   _NL_CURRENT (LC_COLLATE,  
                                                _NL_COLLATE_TABLEWC);  
                                 weights = (const int32_t *)  
                                   _NL_CURRENT (LC_COLLATE,  
                                                _NL_COLLATE_WEIGHTWC);  
                                 extra = (const int32_t *)  
                                   _NL_CURRENT (LC_COLLATE,  
                                                _NL_COLLATE_EXTRAWC);  
                                 indirect = (const int32_t *)  
                                   _NL_CURRENT (LC_COLLATE,  
                                                _NL_COLLATE_INDIRECTWC);  
   
                                 idx = findidx ((const wint_t**)&cp);  
                                 if (idx == 0 || cp < (wint_t*) str + c1)  
                                   /* This is no valid character.  */  
                                   FREE_STACK_RETURN (REG_ECOLLATE);  
   
                                 str[0] = (wchar_t)idx;  
                               }  
                             else /* delim == '.' */  
                               {  
                                 /* We push collation sequence value  
                                    for collating symbol.  */  
                                 int32_t table_size;  
                                 const int32_t *symb_table;  
                                 const unsigned char *extra;  
                                 int32_t idx;  
                                 int32_t elem;  
                                 int32_t second;  
                                 int32_t hash;  
                                 char char_str[c1];  
   
                                 /* We have to convert the name to a single-byte  
                                    string.  This is possible since the names  
                                    consist of ASCII characters and the internal  
                                    representation is UCS4.  */  
                                 for (i = 0; i < c1; ++i)  
                                   char_str[i] = str[i];  
   
                                 table_size =  
                                   _NL_CURRENT_WORD (LC_COLLATE,  
                                                     _NL_COLLATE_SYMB_HASH_SIZEMB);  
                                 symb_table = (const int32_t *)  
                                   _NL_CURRENT (LC_COLLATE,  
                                                _NL_COLLATE_SYMB_TABLEMB);  
                                 extra = (const unsigned char *)  
                                   _NL_CURRENT (LC_COLLATE,  
                                                _NL_COLLATE_SYMB_EXTRAMB);  
   
                                 /* Locate the character in the hashing table.  */  
                                 hash = elem_hash (char_str, c1);  
   
                                 idx = 0;  
                                 elem = hash % table_size;  
                                 second = hash % (table_size - 2);  
                                 while (symb_table[2 * elem] != 0)  
                                   {  
                                     /* First compare the hashing value.  */  
                                     if (symb_table[2 * elem] == hash  
                                         && c1 == extra[symb_table[2 * elem + 1]]  
                                         && memcmp (char_str,  
                                                    &extra[symb_table[2 * elem + 1]  
                                                          + 1], c1) == 0)  
                                       {  
                                         /* Yep, this is the entry.  */  
                                         idx = symb_table[2 * elem + 1];  
                                         idx += 1 + extra[idx];  
                                         break;  
                                       }  
   
                                     /* Next entry.  */  
                                     elem += second;  
                                   }  
   
                                 if (symb_table[2 * elem] != 0)  
                                   {  
                                     /* Compute the index of the byte sequence  
                                        in the table.  */  
                                     idx += 1 + extra[idx];  
                                     /* Adjust for the alignment.  */  
                                     idx = (idx + 3) & ~3;  
   
                                     str[0] = (wchar_t) idx + 4;  
                                   }  
                                 else if (symb_table[2 * elem] == 0 && c1 == 1)  
                                   {  
                                     /* No valid character.  Match it as a  
                                        single byte character.  */  
                                     had_char_class = false;  
                                     BUF_PUSH(str[0]);  
                                     /* Update the length of characters  */  
                                     laststart[5]++;  
                                     range_start = str[0];  
   
                                     /* Throw away the ] at the end of the  
                                        collating symbol.  */  
                                     PATFETCH (c);  
                                     /* exit from the switch block.  */  
                                     continue;  
                                   }  
                                 else  
                                   FREE_STACK_RETURN (REG_ECOLLATE);  
                               }  
                             datasize = 1;  
                           }  
95  # endif  # endif
                         /* Throw away the ] at the end of the equivalence  
                            class (or collating symbol).  */  
                         PATFETCH (c);  
   
                         /* Allocate the space for the equivalence class  
                            (or collating symbol) (and '\0' if needed).  */  
                         GET_BUFFER_SPACE(datasize);  
                         /* Update the pointer to indicate end of buffer.  */  
                         b += datasize;  
   
                         if (delim == '=')  
                           { /* equivalence class  */  
                             /* Calculate the offset of char_ranges,  
                                which is next to equivalence_classes.  */  
                             offset = laststart[1] + laststart[2]  
                               + laststart[3] +6;  
                             /* Insert space.  */  
                             insert_space(datasize, laststart + offset, b - 1);  
   
                             /* Write the equivalence_class and \0.  */  
                             for (i = 0 ; i < datasize ; i++)  
                               laststart[offset + i] = str[i];  
   
                             /* Update the length of equivalence_classes.  */  
                             laststart[3] += datasize;  
                             had_char_class = true;  
                           }  
                         else /* delim == '.' */  
                           { /* collating symbol  */  
                             /* Calculate the offset of the equivalence_classes,  
                                which is next to collating_symbols.  */  
                             offset = laststart[1] + laststart[2] + 6;  
                             /* Insert space and write the collationg_symbol  
                                and \0.  */  
                             insert_space(datasize, laststart + offset, b-1);  
                             for (i = 0 ; i < datasize ; i++)  
                               laststart[offset + i] = str[i];  
   
                             /* In re_match_2_internal if range_start < -1, we  
                                assume -range_start is the offset of the  
                                collating symbol which is specified as  
                                the character of the range start.  So we assign  
                                -(laststart[1] + laststart[2] + 6) to  
                                range_start.  */  
                             range_start = -(laststart[1] + laststart[2] + 6);  
                             /* Update the length of collating_symbol.  */  
                             laststart[2] += datasize;  
                             had_char_class = false;  
                           }  
                       }  
                     else  
                       {  
                         c1++;  
                         while (c1--)  
                           PATUNFETCH;  
                         BUF_PUSH ('[');  
                         BUF_PUSH (delim);  
                         laststart[5] += 2; /* Update the length of characters  */  
                         range_start = delim;  
                         had_char_class = false;  
                       }  
                   }  
                 else  
                   {  
                     had_char_class = false;  
                     BUF_PUSH(c);  
                     laststart[5]++;  /* Update the length of characters  */  
                     range_start = c;  
                   }  
               }  
   
 #else /* BYTE */  
             /* Ensure that we have enough space to push a charset: the  
                opcode, the length count, and the bitset; 34 bytes in all.  */  
             GET_BUFFER_SPACE (34);  
   
             laststart = b;  
   
             /* We test `*p == '^' twice, instead of using an if  
                statement, so we only need one BUF_PUSH.  */  
             BUF_PUSH (*p == '^' ? charset_not : charset);  
             if (*p == '^')  
               p++;  
   
             /* Remember the first position in the bracket expression.  */  
             p1 = p;  
   
             /* Push the number of bytes in the bitmap.  */  
             BUF_PUSH ((1 << BYTEWIDTH) / BYTEWIDTH);  
   
             /* Clear the whole map.  */  
             bzero (b, (1 << BYTEWIDTH) / BYTEWIDTH);  
   
             /* charset_not matches newline according to a syntax bit.  */  
             if ((re_opcode_t) b[-2] == charset_not  
                 && (syntax & RE_HAT_LISTS_NOT_NEWLINE))  
               SET_LIST_BIT ('\n');  
   
             /* Read in characters and ranges, setting map bits.  */  
             for (;;)  
               {  
                 if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                 PATFETCH (c);  
   
                 /* \ might escape characters inside [...] and [^...].  */  
                 if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\')  
                   {  
                     if (p == pend) FREE_STACK_RETURN (REG_EESCAPE);  
   
                     PATFETCH (c1);  
                     SET_LIST_BIT (c1);  
                     range_start = c1;  
                     continue;  
                   }  
   
                 /* Could be the end of the bracket expression.  If it's  
                    not (i.e., when the bracket expression is `[]' so  
                    far), the ']' character bit gets set way below.  */  
                 if (c == ']' && p != p1 + 1)  
                   break;  
   
                 /* Look ahead to see if it's a range when the last thing  
                    was a character class.  */  
                 if (had_char_class && c == '-' && *p != ']')  
                   FREE_STACK_RETURN (REG_ERANGE);  
   
                 /* Look ahead to see if it's a range when the last thing  
                    was a character: if this is a hyphen not at the  
                    beginning or the end of a list, then it's the range  
                    operator.  */  
                 if (c == '-'  
                     && !(p - 2 >= pattern && p[-2] == '[')  
                     && !(p - 3 >= pattern && p[-3] == '[' && p[-2] == '^')  
                     && *p != ']')  
                   {  
                     reg_errcode_t ret  
                       = byte_compile_range (range_start, &p, pend, translate,  
                                             syntax, b);  
                     if (ret != REG_NOERROR) FREE_STACK_RETURN (ret);  
                     range_start = 0xffffffff;  
                   }  
   
                 else if (p[0] == '-' && p[1] != ']')  
                   { /* This handles ranges made up of characters only.  */  
                     reg_errcode_t ret;  
   
                     /* Move past the `-'.  */  
                     PATFETCH (c1);  
   
                     ret = byte_compile_range (c, &p, pend, translate, syntax, b);  
                     if (ret != REG_NOERROR) FREE_STACK_RETURN (ret);  
                     range_start = 0xffffffff;  
                   }  
   
                 /* See if we're at the beginning of a possible character  
                    class.  */  
   
                 else if (syntax & RE_CHAR_CLASSES && c == '[' && *p == ':')  
                   { /* Leave room for the null.  */  
                     char str[CHAR_CLASS_MAX_LENGTH + 1];  
   
                     PATFETCH (c);  
                     c1 = 0;  
   
                     /* If pattern is `[[:'.  */  
                     if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                     for (;;)  
                       {  
                         PATFETCH (c);  
                         if ((c == ':' && *p == ']') || p == pend)  
                           break;  
                         if (c1 < CHAR_CLASS_MAX_LENGTH)  
                           str[c1++] = c;  
                         else  
                           /* This is in any case an invalid class name.  */  
                           str[0] = '\0';  
                       }  
                     str[c1] = '\0';  
   
                     /* If isn't a word bracketed by `[:' and `:]':  
                        undo the ending character, the letters, and leave  
                        the leading `:' and `[' (but set bits for them).  */  
                     if (c == ':' && *p == ']')  
                       {  
 # if defined _LIBC || WIDE_CHAR_SUPPORT  
                         boolean is_lower = STREQ (str, "lower");  
                         boolean is_upper = STREQ (str, "upper");  
                         wctype_t wt;  
                         int ch;  
   
                         wt = IS_CHAR_CLASS (str);  
                         if (wt == 0)  
                           FREE_STACK_RETURN (REG_ECTYPE);  
   
                         /* Throw away the ] at the end of the character  
                            class.  */  
                         PATFETCH (c);  
   
                         if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                         for (ch = 0; ch < 1 << BYTEWIDTH; ++ch)  
                           {  
                             if (iswctype (btowc (ch), wt))  
                               SET_LIST_BIT (ch);  
   
                             if (translate && (is_upper || is_lower)  
                                 && (ISUPPER (ch) || ISLOWER (ch)))  
                               SET_LIST_BIT (ch);  
                           }  
   
                         had_char_class = true;  
 # else  
                         int ch;  
                         boolean is_alnum = STREQ (str, "alnum");  
                         boolean is_alpha = STREQ (str, "alpha");  
                         boolean is_blank = STREQ (str, "blank");  
                         boolean is_cntrl = STREQ (str, "cntrl");  
                         boolean is_digit = STREQ (str, "digit");  
                         boolean is_graph = STREQ (str, "graph");  
                         boolean is_lower = STREQ (str, "lower");  
                         boolean is_print = STREQ (str, "print");  
                         boolean is_punct = STREQ (str, "punct");  
                         boolean is_space = STREQ (str, "space");  
                         boolean is_upper = STREQ (str, "upper");  
                         boolean is_xdigit = STREQ (str, "xdigit");  
   
                         if (!IS_CHAR_CLASS (str))  
                           FREE_STACK_RETURN (REG_ECTYPE);  
   
                         /* Throw away the ] at the end of the character  
                            class.  */  
                         PATFETCH (c);  
   
                         if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                         for (ch = 0; ch < 1 << BYTEWIDTH; ch++)  
                           {  
                             /* This was split into 3 if's to  
                                avoid an arbitrary limit in some compiler.  */  
                             if (   (is_alnum  && ISALNUM (ch))  
                                 || (is_alpha  && ISALPHA (ch))  
                                 || (is_blank  && ISBLANK (ch))  
                                 || (is_cntrl  && ISCNTRL (ch)))  
                               SET_LIST_BIT (ch);  
                             if (   (is_digit  && ISDIGIT (ch))  
                                 || (is_graph  && ISGRAPH (ch))  
                                 || (is_lower  && ISLOWER (ch))  
                                 || (is_print  && ISPRINT (ch)))  
                               SET_LIST_BIT (ch);  
                             if (   (is_punct  && ISPUNCT (ch))  
                                 || (is_space  && ISSPACE (ch))  
                                 || (is_upper  && ISUPPER (ch))  
                                 || (is_xdigit && ISXDIGIT (ch)))  
                               SET_LIST_BIT (ch);  
                             if (   translate && (is_upper || is_lower)  
                                 && (ISUPPER (ch) || ISLOWER (ch)))  
                               SET_LIST_BIT (ch);  
                           }  
                         had_char_class = true;  
 # endif /* libc || wctype.h */  
                       }  
                     else  
                       {  
                         c1++;  
                         while (c1--)  
                           PATUNFETCH;  
                         SET_LIST_BIT ('[');  
                         SET_LIST_BIT (':');  
                         range_start = ':';  
                         had_char_class = false;  
                       }  
                   }  
                 else if (syntax & RE_CHAR_CLASSES && c == '[' && *p == '=')  
                   {  
                     unsigned char str[MB_LEN_MAX + 1];  
 # ifdef _LIBC  
                     uint32_t nrules =  
                       _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);  
 # endif  
   
                     PATFETCH (c);  
                     c1 = 0;  
   
                     /* If pattern is `[[='.  */  
                     if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                     for (;;)  
                       {  
                         PATFETCH (c);  
                         if ((c == '=' && *p == ']') || p == pend)  
                           break;  
                         if (c1 < MB_LEN_MAX)  
                           str[c1++] = c;  
                         else  
                           /* This is in any case an invalid class name.  */  
                           str[0] = '\0';  
                       }  
                     str[c1] = '\0';  
   
                     if (c == '=' && *p == ']' && str[0] != '\0')  
                       {  
                         /* If we have no collation data we use the default  
                            collation in which each character is in a class  
                            by itself.  It also means that ASCII is the  
                            character set and therefore we cannot have character  
                            with more than one byte in the multibyte  
                            representation.  */  
 # ifdef _LIBC  
                         if (nrules == 0)  
 # endif  
                           {  
                             if (c1 != 1)  
                               FREE_STACK_RETURN (REG_ECOLLATE);  
   
                             /* Throw away the ] at the end of the equivalence  
                                class.  */  
                             PATFETCH (c);  
   
                             /* Set the bit for the character.  */  
                             SET_LIST_BIT (str[0]);  
                           }  
 # ifdef _LIBC  
                         else  
                           {  
                             /* Try to match the byte sequence in `str' against  
                                those known to the collate implementation.  
                                First find out whether the bytes in `str' are  
                                actually from exactly one character.  */  
                             const int32_t *table;  
                             const unsigned char *weights;  
                             const unsigned char *extra;  
                             const int32_t *indirect;  
                             int32_t idx;  
                             const unsigned char *cp = str;  
                             int ch;  
   
                             /* This #include defines a local function!  */  
 #  include <locale/weight.h>  
   
                             table = (const int32_t *)  
                               _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);  
                             weights = (const unsigned char *)  
                               _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTMB);  
                             extra = (const unsigned char *)  
                               _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);  
                             indirect = (const int32_t *)  
                               _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTMB);  
   
                             idx = findidx (&cp);  
                             if (idx == 0 || cp < str + c1)  
                               /* This is no valid character.  */  
                               FREE_STACK_RETURN (REG_ECOLLATE);  
   
                             /* Throw away the ] at the end of the equivalence  
                                class.  */  
                             PATFETCH (c);  
   
                             /* Now we have to go throught the whole table  
                                and find all characters which have the same  
                                first level weight.  
   
                                XXX Note that this is not entirely correct.  
                                we would have to match multibyte sequences  
                                but this is not possible with the current  
                                implementation.  */  
                             for (ch = 1; ch < 256; ++ch)  
                               /* XXX This test would have to be changed if we  
                                  would allow matching multibyte sequences.  */  
                               if (table[ch] > 0)  
                                 {  
                                   int32_t idx2 = table[ch];  
                                   size_t len = weights[idx2];  
   
                                   /* Test whether the lenghts match.  */  
                                   if (weights[idx] == len)  
                                     {  
                                       /* They do.  New compare the bytes of  
                                          the weight.  */  
                                       size_t cnt = 0;  
   
                                       while (cnt < len  
                                              && (weights[idx + 1 + cnt]  
                                                  == weights[idx2 + 1 + cnt]))  
                                         ++cnt;  
   
                                       if (cnt == len)  
                                         /* They match.  Mark the character as  
                                            acceptable.  */  
                                         SET_LIST_BIT (ch);  
                                     }  
                                 }  
                           }  
 # endif  
                         had_char_class = true;  
                       }  
                     else  
                       {  
                         c1++;  
                         while (c1--)  
                           PATUNFETCH;  
                         SET_LIST_BIT ('[');  
                         SET_LIST_BIT ('=');  
                         range_start = '=';  
                         had_char_class = false;  
                       }  
                   }  
                 else if (syntax & RE_CHAR_CLASSES && c == '[' && *p == '.')  
                   {  
                     unsigned char str[128];     /* Should be large enough.  */  
 # ifdef _LIBC  
                     uint32_t nrules =  
                       _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);  
 # endif  
   
                     PATFETCH (c);  
                     c1 = 0;  
   
                     /* If pattern is `[[.'.  */  
                     if (p == pend) FREE_STACK_RETURN (REG_EBRACK);  
   
                     for (;;)  
                       {  
                         PATFETCH (c);  
                         if ((c == '.' && *p == ']') || p == pend)  
                           break;  
                         if (c1 < sizeof (str))  
                           str[c1++] = c;  
                         else  
                           /* This is in any case an invalid class name.  */  
                           str[0] = '\0';  
                       }  
                     str[c1] = '\0';  
   
                     if (c == '.' && *p == ']' && str[0] != '\0')  
                       {  
                         /* If we have no collation data we use the default  
                            collation in which each character is the name  
                            for its own class which contains only the one  
                            character.  It also means that ASCII is the  
                            character set and therefore we cannot have character  
                            with more than one byte in the multibyte  
                            representation.  */  
 # ifdef _LIBC  
                         if (nrules == 0)  
 # endif  
                           {  
                             if (c1 != 1)  
                               FREE_STACK_RETURN (REG_ECOLLATE);  
   
                             /* Throw away the ] at the end of the equivalence  
                                class.  */  
                             PATFETCH (c);  
   
                             /* Set the bit for the character.  */  
                             SET_LIST_BIT (str[0]);  
                             range_start = ((const unsigned char *) str)[0];  
                           }  
 # ifdef _LIBC  
                         else  
                           {  
                             /* Try to match the byte sequence in `str' against  
                                those known to the collate implementation.  
                                First find out whether the bytes in `str' are  
                                actually from exactly one character.  */  
                             int32_t table_size;  
                             const int32_t *symb_table;  
                             const unsigned char *extra;  
                             int32_t idx;  
                             int32_t elem;  
                             int32_t second;  
                             int32_t hash;  
   
                             table_size =  
                               _NL_CURRENT_WORD (LC_COLLATE,  
                                                 _NL_COLLATE_SYMB_HASH_SIZEMB);  
                             symb_table = (const int32_t *)  
                               _NL_CURRENT (LC_COLLATE,  
                                            _NL_COLLATE_SYMB_TABLEMB);  
                             extra = (const unsigned char *)  
                               _NL_CURRENT (LC_COLLATE,  
                                            _NL_COLLATE_SYMB_EXTRAMB);  
   
                             /* Locate the character in the hashing table.  */  
                             hash = elem_hash (str, c1);  
   
                             idx = 0;  
                             elem = hash % table_size;  
                             second = hash % (table_size - 2);  
                             while (symb_table[2 * elem] != 0)  
                               {  
                                 /* First compare the hashing value.  */  
                                 if (symb_table[2 * elem] == hash  
                                     && c1 == extra[symb_table[2 * elem + 1]]  
                                     && memcmp (str,  
                                                &extra[symb_table[2 * elem + 1]  
                                                      + 1],  
                                                c1) == 0)  
                                   {  
                                     /* Yep, this is the entry.  */  
                                     idx = symb_table[2 * elem + 1];  
                                     idx += 1 + extra[idx];  
                                     break;  
                                   }  
   
                                 /* Next entry.  */  
                                 elem += second;  
                               }  
   
                             if (symb_table[2 * elem] == 0)  
                               /* This is no valid character.  */  
                               FREE_STACK_RETURN (REG_ECOLLATE);  
   
                             /* Throw away the ] at the end of the equivalence  
                                class.  */  
                             PATFETCH (c);  
   
                             /* Now add the multibyte character(s) we found  
                                to the accept list.  
   
                                XXX Note that this is not entirely correct.  
                                we would have to match multibyte sequences  
                                but this is not possible with the current  
                                implementation.  Also, we have to match  
                                collating symbols, which expand to more than  
                                one file, as a whole and not allow the  
                                individual bytes.  */  
                             c1 = extra[idx++];  
                             if (c1 == 1)  
                               range_start = extra[idx];  
                             while (c1-- > 0)  
                               {  
                                 SET_LIST_BIT (extra[idx]);  
                                 ++idx;  
                               }  
                           }  
 # endif  
                         had_char_class = false;  
                       }  
                     else  
                       {  
                         c1++;  
                         while (c1--)  
                           PATUNFETCH;  
                         SET_LIST_BIT ('[');  
                         SET_LIST_BIT ('.');  
                         range_start = '.';  
                         had_char_class = false;  
                       }  
                   }  
                 else  
                   {  
                     had_char_class = false;  
                     SET_LIST_BIT (c);  
                     range_start = c;  
                   }  
               }  
   
             /* Discard any (non)matching list bytes that are all 0 at the  
                end of the map.  Decrease the map-length byte too.  */  
             while ((int) b[-1] > 0 && b[b[-1] - 1] == 0)  
               b[-1]--;  
             b += b[-1];  
 #endif /* WCHAR */  
           }  
           break;  
   
   
         case '(':  
           if (syntax & RE_NO_BK_PARENS)  
             goto handle_open;  
           else  
             goto normal_char;  
   
   
         case ')':  
           if (syntax & RE_NO_BK_PARENS)  
             goto handle_close;  
           else  
             goto normal_char;  
   
   
         case '\n':  
           if (syntax & RE_NEWLINE_ALT)  
             goto handle_alt;  
           else  
             goto normal_char;  
   
   
         case '|':  
           if (syntax & RE_NO_BK_VBAR)  
             goto handle_alt;  
           else  
             goto normal_char;  
   
   
         case '{':  
            if (syntax & RE_INTERVALS && syntax & RE_NO_BK_BRACES)  
              goto handle_interval;  
            else  
              goto normal_char;  
   
   
         case '\\':  
           if (p == pend) FREE_STACK_RETURN (REG_EESCAPE);  
   
           /* Do not translate the character after the \, so that we can  
              distinguish, e.g., \B from \b, even if we normally would  
              translate, e.g., B to b.  */  
           PATFETCH_RAW (c);  
   
           switch (c)  
             {  
             case '(':  
               if (syntax & RE_NO_BK_PARENS)  
                 goto normal_backslash;  
   
             handle_open:  
               bufp->re_nsub++;  
               regnum++;  
   
               if (COMPILE_STACK_FULL)  
                 {  
                   RETALLOC (compile_stack.stack, compile_stack.size << 1,  
                             compile_stack_elt_t);  
                   if (compile_stack.stack == NULL) return REG_ESPACE;  
   
                   compile_stack.size <<= 1;  
                 }  
   
               /* These are the values to restore when we hit end of this  
                  group.  They are all relative offsets, so that if the  
                  whole pattern moves because of realloc, they will still  
                  be valid.  */  
               COMPILE_STACK_TOP.begalt_offset = begalt - COMPILED_BUFFER_VAR;  
               COMPILE_STACK_TOP.fixup_alt_jump  
                 = fixup_alt_jump ? fixup_alt_jump - COMPILED_BUFFER_VAR + 1 : 0;  
               COMPILE_STACK_TOP.laststart_offset = b - COMPILED_BUFFER_VAR;  
               COMPILE_STACK_TOP.regnum = regnum;  
   
               /* We will eventually replace the 0 with the number of  
                  groups inner to this one.  But do not push a  
                  start_memory for groups beyond the last one we can  
                  represent in the compiled pattern.  */  
               if (regnum <= MAX_REGNUM)  
                 {  
                   COMPILE_STACK_TOP.inner_group_offset = b  
                     - COMPILED_BUFFER_VAR + 2;  
                   BUF_PUSH_3 (start_memory, regnum, 0);  
                 }  
   
               compile_stack.avail++;  
   
               fixup_alt_jump = 0;  
               laststart = 0;  
               begalt = b;  
               /* If we've reached MAX_REGNUM groups, then this open  
                  won't actually generate any code, so we'll have to  
                  clear pending_exact explicitly.  */  
               pending_exact = 0;  
               break;  
   
   
             case ')':  
               if (syntax & RE_NO_BK_PARENS) goto normal_backslash;  
   
               if (COMPILE_STACK_EMPTY)  
                 {  
                   if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD)  
                     goto normal_backslash;  
                   else  
                     FREE_STACK_RETURN (REG_ERPAREN);  
                 }  
   
             handle_close:  
               if (fixup_alt_jump)  
                 { /* Push a dummy failure point at the end of the  
                      alternative for a possible future  
                      `pop_failure_jump' to pop.  See comments at  
                      `push_dummy_failure' in `re_match_2'.  */  
                   BUF_PUSH (push_dummy_failure);  
   
                   /* We allocated space for this jump when we assigned  
                      to `fixup_alt_jump', in the `handle_alt' case below.  */  
                   STORE_JUMP (jump_past_alt, fixup_alt_jump, b - 1);  
                 }  
   
               /* See similar code for backslashed left paren above.  */  
               if (COMPILE_STACK_EMPTY)  
                 {  
                   if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD)  
                     goto normal_char;  
                   else  
                     FREE_STACK_RETURN (REG_ERPAREN);  
                 }  
   
               /* Since we just checked for an empty stack above, this  
                  ``can't happen''.  */  
               assert (compile_stack.avail != 0);  
               {  
                 /* We don't just want to restore into `regnum', because  
                    later groups should continue to be numbered higher,  
                    as in `(ab)c(de)' -- the second group is #2.  */  
                 regnum_t this_group_regnum;  
   
                 compile_stack.avail--;  
                 begalt = COMPILED_BUFFER_VAR + COMPILE_STACK_TOP.begalt_offset;  
                 fixup_alt_jump  
                   = COMPILE_STACK_TOP.fixup_alt_jump  
                     ? COMPILED_BUFFER_VAR + COMPILE_STACK_TOP.fixup_alt_jump - 1  
                     : 0;  
                 laststart = COMPILED_BUFFER_VAR + COMPILE_STACK_TOP.laststart_offset;  
                 this_group_regnum = COMPILE_STACK_TOP.regnum;  
                 /* If we've reached MAX_REGNUM groups, then this open  
                    won't actually generate any code, so we'll have to  
                    clear pending_exact explicitly.  */  
                 pending_exact = 0;  
   
                 /* We're at the end of the group, so now we know how many  
                    groups were inside this one.  */  
                 if (this_group_regnum <= MAX_REGNUM)  
                   {  
                     UCHAR_T *inner_group_loc  
                       = COMPILED_BUFFER_VAR + COMPILE_STACK_TOP.inner_group_offset;  
   
                     *inner_group_loc = regnum - this_group_regnum;  
                     BUF_PUSH_3 (stop_memory, this_group_regnum,  
                                 regnum - this_group_regnum);  
                   }  
               }  
               break;  
   
   
             case '|':                                   /* `\|'.  */  
               if (syntax & RE_LIMITED_OPS || syntax & RE_NO_BK_VBAR)  
                 goto normal_backslash;  
             handle_alt:  
               if (syntax & RE_LIMITED_OPS)  
                 goto normal_char;  
   
               /* Insert before the previous alternative a jump which  
                  jumps to this alternative if the former fails.  */  
               GET_BUFFER_SPACE (1 + OFFSET_ADDRESS_SIZE);  
               INSERT_JUMP (on_failure_jump, begalt,  
                            b + 2 + 2 * OFFSET_ADDRESS_SIZE);  
               pending_exact = 0;  
               b += 1 + OFFSET_ADDRESS_SIZE;  
   
               /* The alternative before this one has a jump after it  
                  which gets executed if it gets matched.  Adjust that  
                  jump so it will jump to this alternative's analogous  
                  jump (put in below, which in turn will jump to the next  
                  (if any) alternative's such jump, etc.).  The last such  
                  jump jumps to the correct final destination.  A picture:  
                           _____ _____  
                           |   | |   |  
                           |   v |   v  
                          a | b   | c  
   
                  If we are at `b', then fixup_alt_jump right now points to a  
                  three-byte space after `a'.  We'll put in the jump, set  
                  fixup_alt_jump to right after `b', and leave behind three  
                  bytes which we'll fill in when we get to after `c'.  */  
   
               if (fixup_alt_jump)  
                 STORE_JUMP (jump_past_alt, fixup_alt_jump, b);  
   
               /* Mark and leave space for a jump after this alternative,  
                  to be filled in later either by next alternative or  
                  when know we're at the end of a series of alternatives.  */  
               fixup_alt_jump = b;  
               GET_BUFFER_SPACE (1 + OFFSET_ADDRESS_SIZE);  
               b += 1 + OFFSET_ADDRESS_SIZE;  
   
               laststart = 0;  
               begalt = b;  
               break;  
   
   
             case '{':  
               /* If \{ is a literal.  */  
               if (!(syntax & RE_INTERVALS)  
                      /* If we're at `\{' and it's not the open-interval  
                         operator.  */  
                   || (syntax & RE_NO_BK_BRACES))  
                 goto normal_backslash;  
   
             handle_interval:  
               {  
                 /* If got here, then the syntax allows intervals.  */  
   
                 /* At least (most) this many matches must be made.  */  
                 int lower_bound = -1, upper_bound = -1;  
   
                 /* Place in the uncompiled pattern (i.e., just after  
                    the '{') to go back to if the interval is invalid.  */  
                 const CHAR_T *beg_interval = p;  
   
                 if (p == pend)  
                   goto invalid_interval;  
   
                 GET_UNSIGNED_NUMBER (lower_bound);  
   
                 if (c == ',')  
                   {  
                     GET_UNSIGNED_NUMBER (upper_bound);  
                     if (upper_bound < 0)  
                       upper_bound = RE_DUP_MAX;  
                   }  
                 else  
                   /* Interval such as `{1}' => match exactly once. */  
                   upper_bound = lower_bound;  
   
                 if (! (0 <= lower_bound && lower_bound <= upper_bound))  
                   goto invalid_interval;  
   
                 if (!(syntax & RE_NO_BK_BRACES))  
                   {  
                     if (c != '\\' || p == pend)  
                       goto invalid_interval;  
                     PATFETCH (c);  
                   }  
   
                 if (c != '}')  
                   goto invalid_interval;  
   
                 /* If it's invalid to have no preceding re.  */  
                 if (!laststart)  
                   {  
                     if (syntax & RE_CONTEXT_INVALID_OPS  
                         && !(syntax & RE_INVALID_INTERVAL_ORD))  
                       FREE_STACK_RETURN (REG_BADRPT);  
                     else if (syntax & RE_CONTEXT_INDEP_OPS)  
                       laststart = b;  
                     else  
                       goto unfetch_interval;  
                   }  
   
                 /* We just parsed a valid interval.  */  
   
                 if (RE_DUP_MAX < upper_bound)  
                   FREE_STACK_RETURN (REG_BADBR);  
   
                 /* If the upper bound is zero, don't want to succeed at  
                    all; jump from `laststart' to `b + 3', which will be  
                    the end of the buffer after we insert the jump.  */  
                 /* ifdef WCHAR, 'b + 1 + OFFSET_ADDRESS_SIZE'  
                    instead of 'b + 3'.  */  
                  if (upper_bound == 0)  
                    {  
                      GET_BUFFER_SPACE (1 + OFFSET_ADDRESS_SIZE);  
                      INSERT_JUMP (jump, laststart, b + 1  
                                   + OFFSET_ADDRESS_SIZE);  
                      b += 1 + OFFSET_ADDRESS_SIZE;  
                    }  
   
                  /* Otherwise, we have a nontrivial interval.  When  
                     we're all done, the pattern will look like:  
                       set_number_at <jump count> <upper bound>  
                       set_number_at <succeed_n count> <lower bound>  
                       succeed_n <after jump addr> <succeed_n count>  
                       <body of loop>  
                       jump_n <succeed_n addr> <jump count>  
                     (The upper bound and `jump_n' are omitted if  
                     `upper_bound' is 1, though.)  */  
                  else  
                    { /* If the upper bound is > 1, we need to insert  
                         more at the end of the loop.  */  
                      unsigned nbytes = 2 + 4 * OFFSET_ADDRESS_SIZE +  
                        (upper_bound > 1) * (2 + 4 * OFFSET_ADDRESS_SIZE);  
   
                      GET_BUFFER_SPACE (nbytes);  
   
                      /* Initialize lower bound of the `succeed_n', even  
                         though it will be set during matching by its  
                         attendant `set_number_at' (inserted next),  
                         because `re_compile_fastmap' needs to know.  
                         Jump to the `jump_n' we might insert below.  */  
                      INSERT_JUMP2 (succeed_n, laststart,  
                                    b + 1 + 2 * OFFSET_ADDRESS_SIZE  
                                    + (upper_bound > 1) * (1 + 2 * OFFSET_ADDRESS_SIZE)  
                                    , lower_bound);  
                      b += 1 + 2 * OFFSET_ADDRESS_SIZE;  
   
                      /* Code to initialize the lower bound.  Insert  
                         before the `succeed_n'.  The `5' is the last two  
                         bytes of this `set_number_at', plus 3 bytes of  
                         the following `succeed_n'.  */  
                      /* ifdef WCHAR, The '1+2*OFFSET_ADDRESS_SIZE'  
                         is the 'set_number_at', plus '1+OFFSET_ADDRESS_SIZE'  
                         of the following `succeed_n'.  */  
                      PREFIX(insert_op2) (set_number_at, laststart, 1  
                                  + 2 * OFFSET_ADDRESS_SIZE, lower_bound, b);  
                      b += 1 + 2 * OFFSET_ADDRESS_SIZE;  
   
                      if (upper_bound > 1)  
                        { /* More than one repetition is allowed, so  
                             append a backward jump to the `succeed_n'  
                             that starts this interval.  
   
                             When we've reached this during matching,  
                             we'll have matched the interval once, so  
                             jump back only `upper_bound - 1' times.  */  
                          STORE_JUMP2 (jump_n, b, laststart  
                                       + 2 * OFFSET_ADDRESS_SIZE + 1,  
                                       upper_bound - 1);  
                          b += 1 + 2 * OFFSET_ADDRESS_SIZE;  
   
                          /* The location we want to set is the second  
                             parameter of the `jump_n'; that is `b-2' as  
                             an absolute address.  `laststart' will be  
                             the `set_number_at' we're about to insert;  
                             `laststart+3' the number to set, the source  
                             for the relative address.  But we are  
                             inserting into the middle of the pattern --  
                             so everything is getting moved up by 5.  
                             Conclusion: (b - 2) - (laststart + 3) + 5,  
                             i.e., b - laststart.  
   
                             We insert this at the beginning of the loop  
                             so that if we fail during matching, we'll  
                             reinitialize the bounds.  */  
                          PREFIX(insert_op2) (set_number_at, laststart,  
                                              b - laststart,  
                                              upper_bound - 1, b);  
                          b += 1 + 2 * OFFSET_ADDRESS_SIZE;  
                        }  
                    }  
                 pending_exact = 0;  
                 break;  
   
               invalid_interval:  
                 if (!(syntax & RE_INVALID_INTERVAL_ORD))  
                   FREE_STACK_RETURN (p == pend ? REG_EBRACE : REG_BADBR);  
               unfetch_interval:  
                 /* Match the characters as literals.  */  
                 p = beg_interval;  
                 c = '{';  
                 if (syntax & RE_NO_BK_BRACES)  
                   goto normal_char;  
                 else  
                   goto normal_backslash;  
               }  
   
 #ifdef emacs  
             /* There is no way to specify the before_dot and after_dot  
                operators.  rms says this is ok.  --karl  */  
             case '=':  
               BUF_PUSH (at_dot);  
               break;  
   
             case 's':  
               laststart = b;  
               PATFETCH (c);  
               BUF_PUSH_2 (syntaxspec, syntax_spec_code[c]);  
               break;  
   
             case 'S':  
               laststart = b;  
               PATFETCH (c);  
               BUF_PUSH_2 (notsyntaxspec, syntax_spec_code[c]);  
               break;  
 #endif /* emacs */  
   
   
             case 'w':  
               if (syntax & RE_NO_GNU_OPS)  
                 goto normal_char;  
               laststart = b;  
               BUF_PUSH (wordchar);  
               break;  
   
   
             case 'W':  
               if (syntax & RE_NO_GNU_OPS)  
                 goto normal_char;  
               laststart = b;  
               BUF_PUSH (notwordchar);  
               break;  
   
   
             case '<':  
               if (syntax & RE_NO_GNU_OPS)  
                 goto normal_char;  
               BUF_PUSH (wordbeg);  
               break;  
   
             case '>':  
               if (syntax & RE_NO_GNU_OPS)  
                 goto normal_char;  
               BUF_PUSH (wordend);  
               break;  
   
             case 'b':  
               if (syntax & RE_NO_GNU_OPS)  
                 goto normal_char;  
               BUF_PUSH (wordbound);  
               break;  
   
             case 'B':  
               if (syntax & RE_NO_GNU_OPS)  
                 goto normal_char;  
               BUF_PUSH (notwordbound);  
               break;  
   
             case '`':  
               if (syntax & RE_NO_GNU_OPS)  
                 goto normal_char;  
               BUF_PUSH (begbuf);  
               break;  
   
             case '\'':  
               if (syntax & RE_NO_GNU_OPS)  
                 goto normal_char;  
               BUF_PUSH (endbuf);  
               break;  
   
             case '1': case '2': case '3': case '4': case '5':  
             case '6': case '7': case '8': case '9':  
               if (syntax & RE_NO_BK_REFS)  
                 goto normal_char;  
   
               c1 = c - '0';  
   
               if (c1 > regnum)  
                 FREE_STACK_RETURN (REG_ESUBREG);  
   
               /* Can't back reference to a subexpression if inside of it.  */  
               if (group_in_compile_stack (compile_stack, (regnum_t) c1))  
                 goto normal_char;  
   
               laststart = b;  
               BUF_PUSH_2 (duplicate, c1);  
               break;  
   
   
             case '+':  
             case '?':  
               if (syntax & RE_BK_PLUS_QM)  
                 goto handle_plus;  
               else  
                 goto normal_backslash;  
   
             default:  
             normal_backslash:  
               /* You might think it would be useful for \ to mean  
                  not to translate; but if we don't translate it  
                  it will never match anything.  */  
               c = TRANSLATE (c);  
               goto normal_char;  
             }  
           break;  
   
   
         default:  
         /* Expects the character in `c'.  */  
         normal_char:  
               /* If no exactn currently being built.  */  
           if (!pending_exact  
 #ifdef WCHAR  
               /* If last exactn handle binary(or character) and  
                  new exactn handle character(or binary).  */  
               || is_exactn_bin != is_binary[p - 1 - pattern]  
 #endif /* WCHAR */  
   
               /* If last exactn not at current position.  */  
               || pending_exact + *pending_exact + 1 != b  
   
               /* We have only one byte following the exactn for the count.  */  
               || *pending_exact == (1 << BYTEWIDTH) - 1  
   
               /* If followed by a repetition operator.  */  
               || *p == '*' || *p == '^'  
               || ((syntax & RE_BK_PLUS_QM)  
                   ? *p == '\\' && (p[1] == '+' || p[1] == '?')  
                   : (*p == '+' || *p == '?'))  
               || ((syntax & RE_INTERVALS)  
                   && ((syntax & RE_NO_BK_BRACES)  
                       ? *p == '{'  
                       : (p[0] == '\\' && p[1] == '{'))))  
             {  
               /* Start building a new exactn.  */  
   
               laststart = b;  
   
 #ifdef WCHAR  
               /* Is this exactn binary data or character? */  
               is_exactn_bin = is_binary[p - 1 - pattern];  
               if (is_exactn_bin)  
                   BUF_PUSH_2 (exactn_bin, 0);  
               else  
                   BUF_PUSH_2 (exactn, 0);  
 #else  
               BUF_PUSH_2 (exactn, 0);  
 #endif /* WCHAR */  
               pending_exact = b - 1;  
             }  
   
           BUF_PUSH (c);  
           (*pending_exact)++;  
           break;  
         } /* switch (c) */  
     } /* while p != pend */  
   
   
   /* Through the pattern now.  */  
   
   if (fixup_alt_jump)  
     STORE_JUMP (jump_past_alt, fixup_alt_jump, b);  
   
   if (!COMPILE_STACK_EMPTY)  
     FREE_STACK_RETURN (REG_EPAREN);  
   
   /* If we don't want backtracking, force success  
      the first time we reach the end of the compiled pattern.  */  
   if (syntax & RE_NO_POSIX_BACKTRACKING)  
     BUF_PUSH (succeed);  
   
 #ifdef WCHAR  
   free (pattern);  
   free (mbs_offset);  
   free (is_binary);  
96  #endif  #endif
   free (compile_stack.stack);  
   
   /* We have succeeded; set the length of the buffer.  */  
 #ifdef WCHAR  
   bufp->used = (uintptr_t) b - (uintptr_t) COMPILED_BUFFER_VAR;  
 #else  
   bufp->used = b - bufp->buffer;  
 #endif  
   
 #ifdef DEBUG  
   if (debug)  
     {  
       DEBUG_PRINT1 ("\nCompiled pattern: \n");  
       PREFIX(print_compiled_pattern) (bufp);  
     }  
 #endif /* DEBUG */  
   
 #ifndef MATCH_MAY_ALLOCATE  
   /* Initialize the failure stack to the largest possible stack.  This  
      isn't necessary unless we're trying to avoid calling alloca in  
      the search and match routines.  */  
   {  
     int num_regs = bufp->re_nsub + 1;  
   
     /* Since DOUBLE_FAIL_STACK refuses to double only if the current size  
        is strictly greater than re_max_failures, the largest possible stack  
        is 2 * re_max_failures failure points.  */  
     if (fail_stack.size < (2 * re_max_failures * MAX_FAILURE_ITEMS))  
       {  
         fail_stack.size = (2 * re_max_failures * MAX_FAILURE_ITEMS);  
   
 # ifdef emacs  
         if (! fail_stack.stack)  
           fail_stack.stack  
             = (PREFIX(fail_stack_elt_t) *) xmalloc (fail_stack.size  
                                     * sizeof (PREFIX(fail_stack_elt_t)));  
         else  
           fail_stack.stack  
             = (PREFIX(fail_stack_elt_t) *) xrealloc (fail_stack.stack,  
                                      (fail_stack.size  
                                       * sizeof (PREFIX(fail_stack_elt_t))));  
 # else /* not emacs */  
         if (! fail_stack.stack)  
           fail_stack.stack  
             = malloc (fail_stack.size * sizeof (PREFIX(fail_stack_elt_t)));  
         else  
           fail_stack.stack  
             = realloc (fail_stack.stack,  
                        fail_stack.size * sizeof (PREFIX(fail_stack_elt_t)));  
 # endif /* not emacs */  
       }  
   
    PREFIX(regex_grow_registers) (num_regs);  
   }  
 #endif /* not MATCH_MAY_ALLOCATE */  
   
   return REG_NOERROR;  
 } /* regex_compile */  
   
 /* Subroutines for `regex_compile'.  */  
   
 /* Store OP at LOC followed by two-byte integer parameter ARG.  */  
 /* ifdef WCHAR, integer parameter is 1 wchar_t.  */  
   
 static void  
 PREFIX(store_op1) (re_opcode_t op, UCHAR_T *loc, int arg)  
 {  
   *loc = (UCHAR_T) op;  
   STORE_NUMBER (loc + 1, arg);  
 }  
   
   
 /* Like `store_op1', but for two two-byte parameters ARG1 and ARG2.  */  
 /* ifdef WCHAR, integer parameter is 1 wchar_t.  */  
   
 static void  
 PREFIX(store_op2) (re_opcode_t op, UCHAR_T *loc, int arg1, int arg2)  
 {  
   *loc = (UCHAR_T) op;  
   STORE_NUMBER (loc + 1, arg1);  
   STORE_NUMBER (loc + 1 + OFFSET_ADDRESS_SIZE, arg2);  
 }  
   
   
 /* Copy the bytes from LOC to END to open up three bytes of space at LOC  
    for OP followed by two-byte integer parameter ARG.  */  
 /* ifdef WCHAR, integer parameter is 1 wchar_t.  */  
   
 static void  
 PREFIX(insert_op1) (re_opcode_t op, UCHAR_T *loc, int arg, UCHAR_T *end)  
 {  
   register UCHAR_T *pfrom = end;  
   register UCHAR_T *pto = end + 1 + OFFSET_ADDRESS_SIZE;  
   
   while (pfrom != loc)  
     *--pto = *--pfrom;  
   
   PREFIX(store_op1) (op, loc, arg);  
 }  
   
   
 /* Like `insert_op1', but for two two-byte parameters ARG1 and ARG2.  */  
 /* ifdef WCHAR, integer parameter is 1 wchar_t.  */  
   
 static void  
 PREFIX(insert_op2) (re_opcode_t op, UCHAR_T *loc, int arg1, int arg2,  
                     UCHAR_T *end)  
 {  
   register UCHAR_T *pfrom = end;  
   register UCHAR_T *pto = end + 1 + 2 * OFFSET_ADDRESS_SIZE;  
   
   while (pfrom != loc)  
     *--pto = *--pfrom;  
   
   PREFIX(store_op2) (op, loc, arg1, arg2);  
 }  
   
   
 /* P points to just after a ^ in PATTERN.  Return true if that ^ comes  
    after an alternative or a begin-subexpression.  We assume there is at  
    least one character before the ^.  */  
   
 static boolean  
 PREFIX(at_begline_loc_p) (const CHAR_T *pattern, const CHAR_T *p,  
                           reg_syntax_t syntax)  
 {  
   const CHAR_T *prev = p - 2;  
   boolean prev_prev_backslash = prev > pattern && prev[-1] == '\\';  
   
   return  
        /* After a subexpression?  */  
        (*prev == '(' && (syntax & RE_NO_BK_PARENS || prev_prev_backslash))  
        /* After an alternative?  */  
     || (*prev == '|' && (syntax & RE_NO_BK_VBAR || prev_prev_backslash));  
 }  
   
   
 /* The dual of at_begline_loc_p.  This one is for $.  We assume there is  
    at least one character after the $, i.e., `P < PEND'.  */  
   
 static boolean  
 PREFIX(at_endline_loc_p) (const CHAR_T *p, const CHAR_T *pend,  
                           reg_syntax_t syntax)  
 {  
   const CHAR_T *next = p;  
   boolean next_backslash = *next == '\\';  
   const CHAR_T *next_next = p + 1 < pend ? p + 1 : 0;  
   
   return  
        /* Before a subexpression?  */  
        (syntax & RE_NO_BK_PARENS ? *next == ')'  
         : next_backslash && next_next && *next_next == ')')  
        /* Before an alternative?  */  
     || (syntax & RE_NO_BK_VBAR ? *next == '|'  
         : next_backslash && next_next && *next_next == '|');  
 }  
   
 #else /* not INSIDE_RECURSION */  
   
 /* Returns true if REGNUM is in one of COMPILE_STACK's elements and  
    false if it's not.  */  
   
 static boolean  
 group_in_compile_stack (compile_stack_type compile_stack,  
                         regnum_t regnum)  
 {  
   int this_element;  
   
   for (this_element = compile_stack.avail - 1;  
        this_element >= 0;  
        this_element--)  
     if (compile_stack.stack[this_element].regnum == regnum)  
       return true;  
   
   return false;  
 }  
 #endif /* not INSIDE_RECURSION */  
   
 #ifdef INSIDE_RECURSION  
   
 #ifdef WCHAR  
 /* This insert space, which size is "num", into the pattern at "loc".  
    "end" must point the end of the allocated buffer.  */  
 static void  
 insert_space (int num, CHAR_T *loc, CHAR_T *end)  
 {  
   register CHAR_T *pto = end;  
   register CHAR_T *pfrom = end - num;  
   
   while (pfrom >= loc)  
     *pto-- = *pfrom--;  
 }  
 #endif /* WCHAR */  
   
 #ifdef WCHAR  
 static reg_errcode_t  
 wcs_compile_range (CHAR_T range_start_char,  
                    const CHAR_T **p_ptr, const CHAR_T *pend,  
                    RE_TRANSLATE_TYPE translate, reg_syntax_t syntax,  
                    CHAR_T *b, CHAR_T *char_set)  
 {  
   const CHAR_T *p = *p_ptr;  
   CHAR_T range_start, range_end;  
   reg_errcode_t ret;  
 # ifdef _LIBC  
   uint32_t nrules;  
   uint32_t start_val, end_val;  
 # endif  
   if (p == pend)  
     return REG_ERANGE;  
   
 # ifdef _LIBC  
   nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);  
   if (nrules != 0)  
     {  
       const char *collseq = (const char *) _NL_CURRENT(LC_COLLATE,  
                                                        _NL_COLLATE_COLLSEQWC);  
       const unsigned char *extra = (const unsigned char *)  
         _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB);  
   
       if (range_start_char < -1)  
         {  
           /* range_start is a collating symbol.  */  
           int32_t *wextra;  
           /* Retreive the index and get collation sequence value.  */  
           wextra = (int32_t*)(extra + char_set[-range_start_char]);  
           start_val = wextra[1 + *wextra];  
         }  
       else  
         start_val = collseq_table_lookup(collseq, TRANSLATE(range_start_char));  
   
       end_val = collseq_table_lookup (collseq, TRANSLATE (p[0]));  
   
       /* Report an error if the range is empty and the syntax prohibits  
          this.  */  
       ret = ((syntax & RE_NO_EMPTY_RANGES)  
              && (start_val > end_val))? REG_ERANGE : REG_NOERROR;  
   
       /* Insert space to the end of the char_ranges.  */  
       insert_space(2, b - char_set[5] - 2, b - 1);  
       *(b - char_set[5] - 2) = (wchar_t)start_val;  
       *(b - char_set[5] - 1) = (wchar_t)end_val;  
       char_set[4]++; /* ranges_index */  
     }  
   else  
 # endif  
     {  
       range_start = (range_start_char >= 0)? TRANSLATE (range_start_char):  
         range_start_char;  
       range_end = TRANSLATE (p[0]);  
       /* Report an error if the range is empty and the syntax prohibits  
          this.  */  
       ret = ((syntax & RE_NO_EMPTY_RANGES)  
              && (range_start > range_end))? REG_ERANGE : REG_NOERROR;  
   
       /* Insert space to the end of the char_ranges.  */  
       insert_space(2, b - char_set[5] - 2, b - 1);  
       *(b - char_set[5] - 2) = range_start;  
       *(b - char_set[5] - 1) = range_end;  
       char_set[4]++; /* ranges_index */  
     }  
   /* Have to increment the pointer into the pattern string, so the  
      caller isn't still at the ending character.  */  
   (*p_ptr)++;  
   
   return ret;  
 }  
 #else /* BYTE */  
 /* Read the ending character of a range (in a bracket expression) from the  
    uncompiled pattern *P_PTR (which ends at PEND).  We assume the  
    starting character is in `P[-2]'.  (`P[-1]' is the character `-'.)  
    Then we set the translation of all bits between the starting and  
    ending characters (inclusive) in the compiled pattern B.  
   
    Return an error code.  
   
    We use these short variable names so we can use the same macros as  
    `regex_compile' itself.  */  
   
 static reg_errcode_t  
 byte_compile_range (unsigned int range_start_char,  
                     const char **p_ptr, const char *pend,  
                     RE_TRANSLATE_TYPE translate, reg_syntax_t syntax,  
                     unsigned char *b)  
 {  
   unsigned this_char;  
   const char *p = *p_ptr;  
   reg_errcode_t ret;  
 # if _LIBC  
   const unsigned char *collseq;  
   unsigned int start_colseq;  
   unsigned int end_colseq;  
 # else  
   unsigned end_char;  
 # endif  
   
   if (p == pend)  
     return REG_ERANGE;  
   
   /* Have to increment the pointer into the pattern string, so the  
      caller isn't still at the ending character.  */  
   (*p_ptr)++;  
   
   /* Report an error if the range is empty and the syntax prohibits this.  */  
   ret = syntax & RE_NO_EMPTY_RANGES ? REG_ERANGE : REG_NOERROR;  
   
 # if _LIBC  
   collseq = (const unsigned char *) _NL_CURRENT (LC_COLLATE,  
                                                  _NL_COLLATE_COLLSEQMB);  
   
   start_colseq = collseq[(unsigned char) TRANSLATE (range_start_char)];  
   end_colseq = collseq[(unsigned char) TRANSLATE (p[0])];  
   for (this_char = 0; this_char <= (unsigned char) -1; ++this_char)  
     {  
       unsigned int this_colseq = collseq[(unsigned char) TRANSLATE (this_char)];  
   
       if (start_colseq <= this_colseq && this_colseq <= end_colseq)  
         {  
           SET_LIST_BIT (TRANSLATE (this_char));  
           ret = REG_NOERROR;  
         }  
     }  
 # else  
   /* Here we see why `this_char' has to be larger than an `unsigned  
      char' -- we would otherwise go into an infinite loop, since all  
      characters <= 0xff.  */  
   range_start_char = TRANSLATE (range_start_char);  
   /* TRANSLATE(p[0]) is casted to char (not unsigned char) in TRANSLATE,  
      and some compilers cast it to int implicitly, so following for_loop  
      may fall to (almost) infinite loop.  
      e.g. If translate[p[0]] = 0xff, end_char may equals to 0xffffffff.  
      To avoid this, we cast p[0] to unsigned int and truncate it.  */  
   end_char = ((unsigned)TRANSLATE(p[0]) & ((1 << BYTEWIDTH) - 1));  
   
   for (this_char = range_start_char; this_char <= end_char; ++this_char)  
     {  
       SET_LIST_BIT (TRANSLATE (this_char));  
       ret = REG_NOERROR;  
     }  
 # endif  
   
   return ret;  
 }  
 #endif /* WCHAR */  
   
 /* re_compile_fastmap computes a ``fastmap'' for the compiled pattern in  
    BUFP.  A fastmap records which of the (1 << BYTEWIDTH) possible  
    characters can start a string that matches the pattern.  This fastmap  
    is used by re_search to skip quickly over impossible starting points.  
   
    The caller must supply the address of a (1 << BYTEWIDTH)-byte data  
    area as BUFP->fastmap.  
   
    We set the `fastmap', `fastmap_accurate', and `can_be_null' fields in  
    the pattern buffer.  
   
    Returns 0 if we succeed, -2 if an internal error.   */  
   
 #ifdef WCHAR  
 /* local function for re_compile_fastmap.  
    truncate wchar_t character to char.  */  
   
 static unsigned char  
 truncate_wchar (CHAR_T c)  
 {  
   unsigned char buf[MB_CUR_MAX];  
   mbstate_t state;  
   int retval;  
   memset (&state, '\0', sizeof (state));  
   retval = wcrtomb (buf, c, &state);  
   return retval > 0 ? buf[0] : (unsigned char) c;  
 }  
 #endif /* WCHAR */  
   
 static int  
 PREFIX(re_compile_fastmap) (struct re_pattern_buffer *bufp)  
 {  
   int j, k;  
 #ifdef MATCH_MAY_ALLOCATE  
   PREFIX(fail_stack_type) fail_stack;  
 #endif  
 #ifndef REGEX_MALLOC  
   char *destination;  
 #endif  
   
   register char *fastmap = bufp->fastmap;  
   
 #ifdef WCHAR  
   /* We need to cast pattern to (wchar_t*), because we casted this compiled  
      pattern to (char*) in regex_compile.  */  
   UCHAR_T *pattern = (UCHAR_T*)bufp->buffer;  
   register UCHAR_T *pend = (UCHAR_T*) (bufp->buffer + bufp->used);  
 #else /* BYTE */  
   UCHAR_T *pattern = bufp->buffer;  
   register UCHAR_T *pend = pattern + bufp->used;  
 #endif /* WCHAR */  
   UCHAR_T *p = pattern;  
   
 #ifdef REL_ALLOC  
   /* This holds the pointer to the failure stack, when  
      it is allocated relocatably.  */  
   fail_stack_elt_t *failure_stack_ptr;  
 #endif  
   
   /* Assume that each path through the pattern can be null until  
      proven otherwise.  We set this false at the bottom of switch  
      statement, to which we get only if a particular path doesn't  
      match the empty string.  */  
   boolean path_can_be_null = true;  
   
   /* We aren't doing a `succeed_n' to begin with.  */  
   boolean succeed_n_p = false;  
   
   assert (fastmap != NULL && p != NULL);  
   
   INIT_FAIL_STACK ();  
   bzero (fastmap, 1 << BYTEWIDTH);  /* Assume nothing's valid.  */  
   bufp->fastmap_accurate = 1;       /* It will be when we're done.  */  
   bufp->can_be_null = 0;  
   
   while (1)  
     {  
       if (p == pend || *p == succeed)  
         {  
           /* We have reached the (effective) end of pattern.  */  
           if (!FAIL_STACK_EMPTY ())  
             {  
               bufp->can_be_null |= path_can_be_null;  
   
               /* Reset for next path.  */  
               path_can_be_null = true;  
   
               p = fail_stack.stack[--fail_stack.avail].pointer;  
   
               continue;  
             }  
           else  
             break;  
         }  
   
       /* We should never be about to go beyond the end of the pattern.  */  
       assert (p < pend);  
   
       switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++))  
         {  
   
         /* I guess the idea here is to simply not bother with a fastmap  
            if a backreference is used, since it's too hard to figure out  
            the fastmap for the corresponding group.  Setting  
            `can_be_null' stops `re_search_2' from using the fastmap, so  
            that is all we do.  */  
         case duplicate:  
           bufp->can_be_null = 1;  
           goto done;  
   
   
       /* Following are the cases which match a character.  These end  
          with `break'.  */  
   
 #ifdef WCHAR  
         case exactn:  
           fastmap[truncate_wchar(p[1])] = 1;  
           break;  
 #else /* BYTE */  
         case exactn:  
           fastmap[p[1]] = 1;  
           break;  
 #endif /* WCHAR */  
 #ifdef MBS_SUPPORT  
         case exactn_bin:  
           fastmap[p[1]] = 1;  
           break;  
 #endif  
   
 #ifdef WCHAR  
         /* It is hard to distinguish fastmap from (multi byte) characters  
            which depends on current locale.  */  
         case charset:  
         case charset_not:  
         case wordchar:  
         case notwordchar:  
           bufp->can_be_null = 1;  
           goto done;  
 #else /* BYTE */  
         case charset:  
           for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--)  
             if (p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH)))  
               fastmap[j] = 1;  
           break;  
   
   
         case charset_not:  
           /* Chars beyond end of map must be allowed.  */  
           for (j = *p * BYTEWIDTH; j < (1 << BYTEWIDTH); j++)  
             fastmap[j] = 1;  
   
           for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--)  
             if (!(p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH))))  
               fastmap[j] = 1;  
           break;  
   
   
         case wordchar:  
           for (j = 0; j < (1 << BYTEWIDTH); j++)  
             if (SYNTAX (j) == Sword)  
               fastmap[j] = 1;  
           break;  
   
   
         case notwordchar:  
           for (j = 0; j < (1 << BYTEWIDTH); j++)  
             if (SYNTAX (j) != Sword)  
               fastmap[j] = 1;  
           break;  
 #endif /* WCHAR */  
   
         case anychar:  
           {  
             int fastmap_newline = fastmap['\n'];  
   
             /* `.' matches anything ...  */  
             for (j = 0; j < (1 << BYTEWIDTH); j++)  
               fastmap[j] = 1;  
   
             /* ... except perhaps newline.  */  
             if (!(bufp->syntax & RE_DOT_NEWLINE))  
               fastmap['\n'] = fastmap_newline;  
   
             /* Return if we have already set `can_be_null'; if we have,  
                then the fastmap is irrelevant.  Something's wrong here.  */  
             else if (bufp->can_be_null)  
               goto done;  
   
             /* Otherwise, have to check alternative paths.  */  
             break;  
           }  
   
 #ifdef emacs  
         case syntaxspec:  
           k = *p++;  
           for (j = 0; j < (1 << BYTEWIDTH); j++)  
             if (SYNTAX (j) == (enum syntaxcode) k)  
               fastmap[j] = 1;  
           break;  
   
   
         case notsyntaxspec:  
           k = *p++;  
           for (j = 0; j < (1 << BYTEWIDTH); j++)  
             if (SYNTAX (j) != (enum syntaxcode) k)  
               fastmap[j] = 1;  
           break;  
   
   
       /* All cases after this match the empty string.  These end with  
          `continue'.  */  
   
   
         case before_dot:  
         case at_dot:  
         case after_dot:  
           continue;  
 #endif /* emacs */  
   
   
         case no_op:  
         case begline:  
         case endline:  
         case begbuf:  
         case endbuf:  
         case wordbound:  
         case notwordbound:  
         case wordbeg:  
         case wordend:  
         case push_dummy_failure:  
           continue;  
   
   
         case jump_n:  
         case pop_failure_jump:  
         case maybe_pop_jump:  
         case jump:  
         case jump_past_alt:  
         case dummy_failure_jump:  
           EXTRACT_NUMBER_AND_INCR (j, p);  
           p += j;  
           if (j > 0)  
             continue;  
   
           /* Jump backward implies we just went through the body of a  
              loop and matched nothing.  Opcode jumped to should be  
              `on_failure_jump' or `succeed_n'.  Just treat it like an  
              ordinary jump.  For a * loop, it has pushed its failure  
              point already; if so, discard that as redundant.  */  
           if ((re_opcode_t) *p != on_failure_jump  
               && (re_opcode_t) *p != succeed_n)  
             continue;  
   
           p++;  
           EXTRACT_NUMBER_AND_INCR (j, p);  
           p += j;  
   
           /* If what's on the stack is where we are now, pop it.  */  
           if (!FAIL_STACK_EMPTY ()  
               && fail_stack.stack[fail_stack.avail - 1].pointer == p)  
             fail_stack.avail--;  
   
           continue;  
   
   
         case on_failure_jump:  
         case on_failure_keep_string_jump:  
         handle_on_failure_jump:  
           EXTRACT_NUMBER_AND_INCR (j, p);  
   
           /* For some patterns, e.g., `(a?)?', `p+j' here points to the  
              end of the pattern.  We don't want to push such a point,  
              since when we restore it above, entering the switch will  
              increment `p' past the end of the pattern.  We don't need  
              to push such a point since we obviously won't find any more  
              fastmap entries beyond `pend'.  Such a pattern can match  
              the null string, though.  */  
           if (p + j < pend)  
             {  
               if (!PUSH_PATTERN_OP (p + j, fail_stack))  
                 {  
                   RESET_FAIL_STACK ();  
                   return -2;  
                 }  
             }  
           else  
             bufp->can_be_null = 1;  
   
           if (succeed_n_p)  
             {  
               EXTRACT_NUMBER_AND_INCR (k, p);   /* Skip the n.  */  
               succeed_n_p = false;  
             }  
   
           continue;  
   
   
         case succeed_n:  
           /* Get to the number of times to succeed.  */  
           p += OFFSET_ADDRESS_SIZE;  
   
           /* Increment p past the n for when k != 0.  */  
           EXTRACT_NUMBER_AND_INCR (k, p);  
           if (k == 0)  
             {  
               p -= 2 * OFFSET_ADDRESS_SIZE;  
               succeed_n_p = true;  /* Spaghetti code alert.  */  
               goto handle_on_failure_jump;  
             }  
           continue;  
   
   
         case set_number_at:  
           p += 2 * OFFSET_ADDRESS_SIZE;  
           continue;  
   
   
         case start_memory:  
         case stop_memory:  
           p += 2;  
           continue;  
   
   
         default:  
           abort (); /* We have listed all the cases.  */  
         } /* switch *p++ */  
   
       /* Getting here means we have found the possible starting  
          characters for one path of the pattern -- and that the empty  
          string does not match.  We need not follow this path further.  
          Instead, look at the next alternative (remembered on the  
          stack), or quit if no more.  The test at the top of the loop  
          does these things.  */  
       path_can_be_null = false;  
       p = pend;  
     } /* while p */  
   
   /* Set `can_be_null' for the last path (also the first path, if the  
      pattern is empty).  */  
   bufp->can_be_null |= path_can_be_null;  
   
  done:  
   RESET_FAIL_STACK ();  
   return 0;  
 }  
   
 #else /* not INSIDE_RECURSION */  
   
 int  
 re_compile_fastmap (struct re_pattern_buffer *bufp)  
 {  
 # ifdef MBS_SUPPORT  
   if (MB_CUR_MAX != 1)  
     return wcs_re_compile_fastmap(bufp);  
   else  
 # endif  
     return byte_re_compile_fastmap(bufp);  
 } /* re_compile_fastmap */  
 #ifdef _LIBC  
 weak_alias (__re_compile_fastmap, re_compile_fastmap)  
 #endif  
   
   
 /* Set REGS to hold NUM_REGS registers, storing them in STARTS and  
    ENDS.  Subsequent matches using PATTERN_BUFFER and REGS will use  
    this memory for recording register information.  STARTS and ENDS  
    must be allocated using the malloc library routine, and must each  
    be at least NUM_REGS * sizeof (regoff_t) bytes long.  
   
    If NUM_REGS == 0, then subsequent matches should allocate their own  
    register data.  
   
    Unless this function is called, the first search or match using  
    PATTERN_BUFFER will allocate its own register data, without  
    freeing the old data.  */  
   
 void  
 re_set_registers (struct re_pattern_buffer *bufp,  
                   struct re_registers *regs,  
                   unsigned int num_regs,  
                   regoff_t *starts, regoff_t *ends)  
 {  
   if (num_regs)  
     {  
       bufp->regs_allocated = REGS_REALLOCATE;  
       regs->num_regs = num_regs;  
       regs->start = starts;  
       regs->end = ends;  
     }  
   else  
     {  
       bufp->regs_allocated = REGS_UNALLOCATED;  
       regs->num_regs = 0;  
       regs->start = regs->end = (regoff_t *) 0;  
     }  
 }  
 #ifdef _LIBC  
 weak_alias (__re_set_registers, re_set_registers)  
 #endif  
   
 /* Searching routines.  */  
   
 /* Like re_search_2, below, but only one string is specified, and  
    doesn't let you say where to stop matching.  */  
   
 int  
 re_search (struct re_pattern_buffer *bufp,  
            const char *string,  
            int size, int startpos, int range,  
            struct re_registers *regs)  
 {  
   return re_search_2 (bufp, NULL, 0, string, size, startpos, range,  
                       regs, size);  
 }  
 #ifdef _LIBC  
 weak_alias (__re_search, re_search)  
 #endif  
   
   
 /* Using the compiled pattern in BUFP->buffer, first tries to match the  
    virtual concatenation of STRING1 and STRING2, starting first at index  
    STARTPOS, then at STARTPOS + 1, and so on.  
   
    STRING1 and STRING2 have length SIZE1 and SIZE2, respectively.  
   
    RANGE is how far to scan while trying to match.  RANGE = 0 means try  
    only at STARTPOS; in general, the last start tried is STARTPOS +  
    RANGE.  
   
    In REGS, return the indices of the virtual concatenation of STRING1  
    and STRING2 that matched the entire BUFP->buffer and its contained  
    subexpressions.  
   
    Do not consider matching one past the index STOP in the virtual  
    concatenation of STRING1 and STRING2.  
   
    We return either the position in the strings at which the match was  
    found, -1 if no match, or -2 if error (such as failure  
    stack overflow).  */  
   
 int  
 re_search_2 (struct re_pattern_buffer *bufp,  
              const char *string1, int size1,  
              const char *string2, int size2,  
              int startpos, int range,  
              struct re_registers *regs,  
              int stop)  
 {  
 # ifdef MBS_SUPPORT  
   if (MB_CUR_MAX != 1)  
     return wcs_re_search_2 (bufp, string1, size1, string2, size2, startpos,  
                             range, regs, stop);  
   else  
 # endif  
     return byte_re_search_2 (bufp, string1, size1, string2, size2, startpos,  
                              range, regs, stop);  
 } /* re_search_2 */  
 #ifdef _LIBC  
 weak_alias (__re_search_2, re_search_2)  
 #endif  
   
 #endif /* not INSIDE_RECURSION */  
   
 #ifdef INSIDE_RECURSION  
   
 #ifdef MATCH_MAY_ALLOCATE  
 # define FREE_VAR(var) if (var) REGEX_FREE (var); var = NULL  
 #else  
 # define FREE_VAR(var) if (var) free (var); var = NULL  
 #endif  
   
 #ifdef WCHAR  
 # define MAX_ALLOCA_SIZE        2000  
   
 # define FREE_WCS_BUFFERS() \  
   do {                                                                        \  
     if (size1 > MAX_ALLOCA_SIZE)                                              \  
       {                                                                       \  
         free (wcs_string1);                                                   \  
         free (mbs_offset1);                                                   \  
       }                                                                       \  
     else                                                                      \  
       {                                                                       \  
         FREE_VAR (wcs_string1);                                               \  
         FREE_VAR (mbs_offset1);                                               \  
       }                                                                       \  
     if (size2 > MAX_ALLOCA_SIZE)                                              \  
       {                                                                       \  
         free (wcs_string2);                                                   \  
         free (mbs_offset2);                                                   \  
       }                                                                       \  
     else                                                                      \  
       {                                                                       \  
         FREE_VAR (wcs_string2);                                               \  
         FREE_VAR (mbs_offset2);                                               \  
       }                                                                       \  
   } while (0)  
   
 #endif  
   
   
 static int  
 PREFIX(re_search_2) (struct re_pattern_buffer *bufp,  
                      const char *string1, int size1,  
                      const char *string2, int size2,  
                      int startpos, int range,  
                      struct re_registers *regs,  
                      int stop)  
 {  
   int val;  
   register char *fastmap = bufp->fastmap;  
   register RE_TRANSLATE_TYPE translate = bufp->translate;  
   int total_size = size1 + size2;  
   int endpos = startpos + range;  
 #ifdef WCHAR  
   /* We need wchar_t* buffers correspond to cstring1, cstring2.  */  
   wchar_t *wcs_string1 = NULL, *wcs_string2 = NULL;  
   /* We need the size of wchar_t buffers correspond to csize1, csize2.  */  
   int wcs_size1 = 0, wcs_size2 = 0;  
   /* offset buffer for optimizatoin. See convert_mbs_to_wc.  */  
   int *mbs_offset1 = NULL, *mbs_offset2 = NULL;  
   /* They hold whether each wchar_t is binary data or not.  */  
   char *is_binary = NULL;  
 #endif /* WCHAR */  
   
   /* Check for out-of-range STARTPOS.  */  
   if (startpos < 0 || startpos > total_size)  
     return -1;  
   
   /* Fix up RANGE if it might eventually take us outside  
      the virtual concatenation of STRING1 and STRING2.  
      Make sure we won't move STARTPOS below 0 or above TOTAL_SIZE.  */  
   if (endpos < 0)  
     range = 0 - startpos;  
   else if (endpos > total_size)  
     range = total_size - startpos;  
   
   /* If the search isn't to be a backwards one, don't waste time in a  
      search for a pattern that must be anchored.  */  
   if (bufp->used > 0 && range > 0  
       && ((re_opcode_t) bufp->buffer[0] == begbuf  
           /* `begline' is like `begbuf' if it cannot match at newlines.  */  
           || ((re_opcode_t) bufp->buffer[0] == begline  
               && !bufp->newline_anchor)))  
     {  
       if (startpos > 0)  
         return -1;  
       else  
         range = 1;  
     }  
   
 #ifdef emacs  
   /* In a forward search for something that starts with \=.  
      don't keep searching past point.  */  
   if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == at_dot && range > 0)  
     {  
       range = PT - startpos;  
       if (range <= 0)  
         return -1;  
     }  
 #endif /* emacs */  
   
   /* Update the fastmap now if not correct already.  */  
   if (fastmap && !bufp->fastmap_accurate)  
     if (re_compile_fastmap (bufp) == -2)  
       return -2;  
   
 #ifdef WCHAR  
   /* Allocate wchar_t array for wcs_string1 and wcs_string2 and  
      fill them with converted string.  */  
   if (size1 != 0)  
     {  
       if (size1 > MAX_ALLOCA_SIZE)  
         {  
           wcs_string1 = TALLOC (size1 + 1, CHAR_T);  
           mbs_offset1 = TALLOC (size1 + 1, int);  
           is_binary = TALLOC (size1 + 1, char);  
         }  
       else  
         {  
           wcs_string1 = REGEX_TALLOC (size1 + 1, CHAR_T);  
           mbs_offset1 = REGEX_TALLOC (size1 + 1, int);  
           is_binary = REGEX_TALLOC (size1 + 1, char);  
         }  
       if (!wcs_string1 || !mbs_offset1 || !is_binary)  
         {  
           if (size1 > MAX_ALLOCA_SIZE)  
             {  
               free (wcs_string1);  
               free (mbs_offset1);  
               free (is_binary);  
             }  
           else  
             {  
               FREE_VAR (wcs_string1);  
               FREE_VAR (mbs_offset1);  
               FREE_VAR (is_binary);  
             }  
           return -2;  
         }  
       wcs_size1 = convert_mbs_to_wcs(wcs_string1, string1, size1,  
                                      mbs_offset1, is_binary);  
       wcs_string1[wcs_size1] = L'\0'; /* for a sentinel  */  
       if (size1 > MAX_ALLOCA_SIZE)  
         free (is_binary);  
       else  
         FREE_VAR (is_binary);  
     }  
   if (size2 != 0)  
     {  
       if (size2 > MAX_ALLOCA_SIZE)  
         {  
           wcs_string2 = TALLOC (size2 + 1, CHAR_T);  
           mbs_offset2 = TALLOC (size2 + 1, int);  
           is_binary = TALLOC (size2 + 1, char);  
         }  
       else  
         {  
           wcs_string2 = REGEX_TALLOC (size2 + 1, CHAR_T);  
           mbs_offset2 = REGEX_TALLOC (size2 + 1, int);  
           is_binary = REGEX_TALLOC (size2 + 1, char);  
         }  
       if (!wcs_string2 || !mbs_offset2 || !is_binary)  
         {  
           FREE_WCS_BUFFERS ();  
           if (size2 > MAX_ALLOCA_SIZE)  
             free (is_binary);  
           else  
             FREE_VAR (is_binary);  
           return -2;  
         }  
       wcs_size2 = convert_mbs_to_wcs(wcs_string2, string2, size2,  
                                      mbs_offset2, is_binary);  
       wcs_string2[wcs_size2] = L'\0'; /* for a sentinel  */  
       if (size2 > MAX_ALLOCA_SIZE)  
         free (is_binary);  
       else  
         FREE_VAR (is_binary);  
     }  
 #endif /* WCHAR */  
   
   
   /* Loop through the string, looking for a place to start matching.  */  
   for (;;)  
     {  
       /* If a fastmap is supplied, skip quickly over characters that  
          cannot be the start of a match.  If the pattern can match the  
          null string, however, we don't need to skip characters; we want  
          the first null string.  */  
       if (fastmap && startpos < total_size && !bufp->can_be_null)  
         {  
           if (range > 0)        /* Searching forwards.  */  
             {  
               register const char *d;  
               register int lim = 0;  
               int irange = range;  
   
               if (startpos < size1 && startpos + range >= size1)  
                 lim = range - (size1 - startpos);  
   
               d = (startpos >= size1 ? string2 - size1 : string1) + startpos;  
   
               /* Written out as an if-else to avoid testing `translate'  
                  inside the loop.  */  
               if (translate)  
                 while (range > lim  
                        && !fastmap[(unsigned char)  
                                    translate[(unsigned char) *d++]])  
                   range--;  
               else  
                 while (range > lim && !fastmap[(unsigned char) *d++])  
                   range--;  
   
               startpos += irange - range;  
             }  
           else                          /* Searching backwards.  */  
             {  
               register CHAR_T c = (size1 == 0 || startpos >= size1  
                                       ? string2[startpos - size1]  
                                       : string1[startpos]);  
   
               if (!fastmap[(unsigned char) TRANSLATE (c)])  
                 goto advance;  
             }  
         }  
   
       /* If can't match the null string, and that's all we have left, fail.  */  
       if (range >= 0 && startpos == total_size && fastmap  
           && !bufp->can_be_null)  
        {  
 #ifdef WCHAR  
          FREE_WCS_BUFFERS ();  
 #endif  
          return -1;  
        }  
   
 #ifdef WCHAR  
       val = wcs_re_match_2_internal (bufp, string1, size1, string2,  
                                      size2, startpos, regs, stop,  
                                      wcs_string1, wcs_size1,  
                                      wcs_string2, wcs_size2,  
                                      mbs_offset1, mbs_offset2);  
 #else /* BYTE */  
       val = byte_re_match_2_internal (bufp, string1, size1, string2,  
                                       size2, startpos, regs, stop);  
 #endif /* BYTE */  
   
 #ifndef REGEX_MALLOC  
 # ifdef C_ALLOCA  
       alloca (0);  
 # endif  
 #endif  
   
       if (val >= 0)  
         {  
 #ifdef WCHAR  
           FREE_WCS_BUFFERS ();  
 #endif  
           return startpos;  
         }  
   
       if (val == -2)  
         {  
 #ifdef WCHAR  
           FREE_WCS_BUFFERS ();  
 #endif  
           return -2;  
         }  
   
     advance:  
       if (!range)  
         break;  
       else if (range > 0)  
         {  
           range--;  
           startpos++;  
         }  
       else  
         {  
           range++;  
           startpos--;  
         }  
     }  
 #ifdef WCHAR  
   FREE_WCS_BUFFERS ();  
 #endif  
   return -1;  
 }  
   
 #ifdef WCHAR  
 /* This converts PTR, a pointer into one of the search wchar_t strings  
    `string1' and `string2' into an multibyte string offset from the  
    beginning of that string. We use mbs_offset to optimize.  
    See convert_mbs_to_wcs.  */  
 # define POINTER_TO_OFFSET(ptr)                                         \  
   (FIRST_STRING_P (ptr)                                                 \  
    ? ((regoff_t)(mbs_offset1 != NULL? mbs_offset1[(ptr)-string1] : 0))  \  
    : ((regoff_t)((mbs_offset2 != NULL? mbs_offset2[(ptr)-string2] : 0)  \  
                  + csize1)))  
 #else /* BYTE */  
 /* This converts PTR, a pointer into one of the search strings `string1'  
    and `string2' into an offset from the beginning of that string.  */  
 # define POINTER_TO_OFFSET(ptr)                 \  
   (FIRST_STRING_P (ptr)                         \  
    ? ((regoff_t) ((ptr) - string1))             \  
    : ((regoff_t) ((ptr) - string2 + size1)))  
 #endif /* WCHAR */  
   
 /* Macros for dealing with the split strings in re_match_2.  */  
   
 #define MATCHING_IN_FIRST_STRING  (dend == end_match_1)  
   
 /* Call before fetching a character with *d.  This switches over to  
    string2 if necessary.  */  
 #define PREFETCH()                                                      \  
   while (d == dend)                                                     \  
     {                                                                   \  
       /* End of string2 => fail.  */                                    \  
       if (dend == end_match_2)                                          \  
         goto fail;                                                      \  
       /* End of string1 => advance to string2.  */                      \  
       d = string2;                                                      \  
       dend = end_match_2;                                               \  
     }  
   
 /* Test if at very beginning or at very end of the virtual concatenation  
    of `string1' and `string2'.  If only one string, it's `string2'.  */  
 #define AT_STRINGS_BEG(d) ((d) == (size1 ? string1 : string2) || !size2)  
 #define AT_STRINGS_END(d) ((d) == end2)  
   
   
 /* Test if D points to a character which is word-constituent.  We have  
    two special cases to check for: if past the end of string1, look at  
    the first character in string2; and if before the beginning of  
    string2, look at the last character in string1.  */  
 #ifdef WCHAR  
 /* Use internationalized API instead of SYNTAX.  */  
 # define WORDCHAR_P(d)                                                  \  
   (iswalnum ((wint_t)((d) == end1 ? *string2                            \  
            : (d) == string2 - 1 ? *(end1 - 1) : *(d))) != 0             \  
    || ((d) == end1 ? *string2                                           \  
        : (d) == string2 - 1 ? *(end1 - 1) : *(d)) == L'_')  
 #else /* BYTE */  
 # define WORDCHAR_P(d)                                                  \  
   (SYNTAX ((d) == end1 ? *string2                                       \  
            : (d) == string2 - 1 ? *(end1 - 1) : *(d))                   \  
    == Sword)  
 #endif /* WCHAR */  
   
 /* Disabled due to a compiler bug -- see comment at case wordbound */  
 #if 0  
 /* Test if the character before D and the one at D differ with respect  
    to being word-constituent.  */  
 #define AT_WORD_BOUNDARY(d)                                             \  
   (AT_STRINGS_BEG (d) || AT_STRINGS_END (d)                             \  
    || WORDCHAR_P (d - 1) != WORDCHAR_P (d))  
 #endif  
   
 /* Free everything we malloc.  */  
 #ifdef MATCH_MAY_ALLOCATE  
 # ifdef WCHAR  
 #  define FREE_VARIABLES()                                              \  
   do {                                                                  \  
     REGEX_FREE_STACK (fail_stack.stack);                                \  
     FREE_VAR (regstart);                                                \  
     FREE_VAR (regend);                                                  \  
     FREE_VAR (old_regstart);                                            \  
     FREE_VAR (old_regend);                                              \  
     FREE_VAR (best_regstart);                                           \  
     FREE_VAR (best_regend);                                             \  
     FREE_VAR (reg_info);                                                \  
     FREE_VAR (reg_dummy);                                               \  
     FREE_VAR (reg_info_dummy);                                          \  
     if (!cant_free_wcs_buf)                                             \  
       {                                                                 \  
         FREE_VAR (string1);                                             \  
         FREE_VAR (string2);                                             \  
         FREE_VAR (mbs_offset1);                                         \  
         FREE_VAR (mbs_offset2);                                         \  
       }                                                                 \  
   } while (0)  
 # else /* BYTE */  
 #  define FREE_VARIABLES()                                              \  
   do {                                                                  \  
     REGEX_FREE_STACK (fail_stack.stack);                                \  
     FREE_VAR (regstart);                                                \  
     FREE_VAR (regend);                                                  \  
     FREE_VAR (old_regstart);                                            \  
     FREE_VAR (old_regend);                                              \  
     FREE_VAR (best_regstart);                                           \  
     FREE_VAR (best_regend);                                             \  
     FREE_VAR (reg_info);                                                \  
     FREE_VAR (reg_dummy);                                               \  
     FREE_VAR (reg_info_dummy);                                          \  
   } while (0)  
 # endif /* WCHAR */  
 #else  
 # ifdef WCHAR  
 #  define FREE_VARIABLES()                                              \  
   do {                                                                  \  
     if (!cant_free_wcs_buf)                                             \  
       {                                                                 \  
         FREE_VAR (string1);                                             \  
         FREE_VAR (string2);                                             \  
         FREE_VAR (mbs_offset1);                                         \  
         FREE_VAR (mbs_offset2);                                         \  
       }                                                                 \  
   } while (0)  
 # else /* BYTE */  
 #  define FREE_VARIABLES() ((void)0) /* Do nothing!  But inhibit gcc warning. */  
 # endif /* WCHAR */  
 #endif /* not MATCH_MAY_ALLOCATE */  
   
 /* These values must meet several constraints.  They must not be valid  
    register values; since we have a limit of 255 registers (because  
    we use only one byte in the pattern for the register number), we can  
    use numbers larger than 255.  They must differ by 1, because of  
    NUM_FAILURE_ITEMS above.  And the value for the lowest register must  
    be larger than the value for the highest register, so we do not try  
    to actually save any registers when none are active.  */  
 #define NO_HIGHEST_ACTIVE_REG (1 << BYTEWIDTH)  
 #define NO_LOWEST_ACTIVE_REG (NO_HIGHEST_ACTIVE_REG + 1)  
   
 #else /* not INSIDE_RECURSION */  
 /* Matching routines.  */  
   
 #ifndef emacs   /* Emacs never uses this.  */  
 /* re_match is like re_match_2 except it takes only a single string.  */  
   
 int  
 re_match (struct re_pattern_buffer *bufp,  
           const char *string,  
           int size, int pos,  
           struct re_registers *regs)  
 {  
   int result;  
 # ifdef MBS_SUPPORT  
   if (MB_CUR_MAX != 1)  
     result = wcs_re_match_2_internal (bufp, NULL, 0, string, size,  
                                       pos, regs, size,  
                                       NULL, 0, NULL, 0, NULL, NULL);  
   else  
 # endif  
     result = byte_re_match_2_internal (bufp, NULL, 0, string, size,  
                                   pos, regs, size);  
 # ifndef REGEX_MALLOC  
 #  ifdef C_ALLOCA  
   alloca (0);  
 #  endif  
 # endif  
   return result;  
 }  
 # ifdef _LIBC  
 weak_alias (__re_match, re_match)  
 # endif  
 #endif /* not emacs */  
   
 #endif /* not INSIDE_RECURSION */  
   
 #ifdef INSIDE_RECURSION  
 static boolean PREFIX(group_match_null_string_p) (UCHAR_T **p,  
                                                   UCHAR_T *end,  
                                         PREFIX(register_info_type) *reg_info);  
 static boolean PREFIX(alt_match_null_string_p) (UCHAR_T *p,  
                                                 UCHAR_T *end,  
                                         PREFIX(register_info_type) *reg_info);  
 static boolean PREFIX(common_op_match_null_string_p) (UCHAR_T **p,  
                                                       UCHAR_T *end,  
                                         PREFIX(register_info_type) *reg_info);  
 static int PREFIX(bcmp_translate) (const CHAR_T *s1, const CHAR_T *s2,  
                                    int len, char *translate);  
 #else /* not INSIDE_RECURSION */  
   
 /* re_match_2 matches the compiled pattern in BUFP against the  
    the (virtual) concatenation of STRING1 and STRING2 (of length SIZE1  
    and SIZE2, respectively).  We start matching at POS, and stop  
    matching at STOP.  
   
    If REGS is non-null and the `no_sub' field of BUFP is nonzero, we  
    store offsets for the substring each group matched in REGS.  See the  
    documentation for exactly how many groups we fill.  
   
    We return -1 if no match, -2 if an internal error (such as the  
    failure stack overflowing).  Otherwise, we return the length of the  
    matched substring.  */  
   
 int  
 re_match_2 (struct re_pattern_buffer *bufp,  
             const char *string1, int size1,  
             const char *string2, int size2,  
             int pos, struct re_registers *regs,  
             int stop)  
 {  
   int result;  
 # ifdef MBS_SUPPORT  
   if (MB_CUR_MAX != 1)  
     result = wcs_re_match_2_internal (bufp, string1, size1, string2, size2,  
                                       pos, regs, stop,  
                                       NULL, 0, NULL, 0, NULL, NULL);  
   else  
 # endif  
     result = byte_re_match_2_internal (bufp, string1, size1, string2, size2,  
                                   pos, regs, stop);  
   
 #ifndef REGEX_MALLOC  
 # ifdef C_ALLOCA  
   alloca (0);  
 # endif  
 #endif  
   return result;  
 }  
 #ifdef _LIBC  
 weak_alias (__re_match_2, re_match_2)  
 #endif  
   
 #endif /* not INSIDE_RECURSION */  
   
 #ifdef INSIDE_RECURSION  
   
 #ifdef WCHAR  
   
 /* This check the substring (from 0, to length) of the multibyte string,  
    to which offset_buffer correspond. And count how many wchar_t_characters  
    the substring occupy. We use offset_buffer to optimization.  
    See convert_mbs_to_wcs.  */  
   
 static int  
 count_mbs_length (int *offset_buffer, int length)  
 {  
   int upper, lower;  
   
   /* Check whether the size is valid.  */  
   if (length < 0)  
     return -1;  
   
   if (offset_buffer == NULL)  
     return 0;  
   
   /* If there are no multibyte character, offset_buffer[i] == i.  
    Optmize for this case.  */  
   if (offset_buffer[length] == length)  
     return length;  
   
   /* Set up upper with length. (because for all i, offset_buffer[i] >= i)  */  
   upper = length;  
   lower = 0;  
   
   while (true)  
     {  
       int middle = (lower + upper) / 2;  
       if (middle == lower || middle == upper)  
         break;  
       if (offset_buffer[middle] > length)  
         upper = middle;  
       else if (offset_buffer[middle] < length)  
         lower = middle;  
       else  
         return middle;  
     }  
   
   return -1;  
 }  
 #endif /* WCHAR */  
   
 /* This is a separate function so that we can force an alloca cleanup  
    afterwards.  */  
 #ifdef WCHAR  
 static int  
 wcs_re_match_2_internal (struct re_pattern_buffer *bufp,  
                          const char *cstring1, int csize1,  
                          const char *cstring2, int csize2,  
                          int pos,  
                          struct re_registers *regs,  
                          int stop,  
                          /* string1 == string2 == NULL means  
                             string1/2, size1/2 and mbs_offset1/2 need  
                             setting up in this function.  */  
                          /* We need wchar_t * buffers corresponding to  
                             cstring1, cstring2.  */  
                          wchar_t *string1, int size1,  
                          wchar_t *string2, int size2,  
                          /* Offset buffer for optimization.  See  
                             convert_mbs_to_wc.  */  
                          int *mbs_offset1,  
                          int *mbs_offset2)  
 #else /* BYTE */  
 static int  
 byte_re_match_2_internal (struct re_pattern_buffer *bufp,  
                           const char *string1, int size1,  
                           const char *string2, int size2,  
                           int pos,  
                           struct re_registers *regs,  
                           int stop)  
 #endif /* BYTE */  
 {  
   /* General temporaries.  */  
   int mcnt;  
   UCHAR_T *p1;  
 #ifdef WCHAR  
   /* They hold whether each wchar_t is binary data or not.  */  
   char *is_binary = NULL;  
   /* If true, we can't free string1/2, mbs_offset1/2.  */  
   int cant_free_wcs_buf = 1;  
 #endif /* WCHAR */  
   
   /* Just past the end of the corresponding string.  */  
   const CHAR_T *end1, *end2;  
   
   /* Pointers into string1 and string2, just past the last characters in  
      each to consider matching.  */  
   const CHAR_T *end_match_1, *end_match_2;  
   
   /* Where we are in the data, and the end of the current string.  */  
   const CHAR_T *d, *dend;  
   
   /* Where we are in the pattern, and the end of the pattern.  */  
 #ifdef WCHAR  
   UCHAR_T *pattern, *p;  
   register UCHAR_T *pend;  
 #else /* BYTE */  
   UCHAR_T *p = bufp->buffer;  
   register UCHAR_T *pend = p + bufp->used;  
 #endif /* WCHAR */  
   
   /* Mark the opcode just after a start_memory, so we can test for an  
      empty subpattern when we get to the stop_memory.  */  
   UCHAR_T *just_past_start_mem = 0;  
   
   /* We use this to map every character in the string.  */  
   RE_TRANSLATE_TYPE translate = bufp->translate;  
   
   /* Failure point stack.  Each place that can handle a failure further  
      down the line pushes a failure point on this stack.  It consists of  
      restart, regend, and reg_info for all registers corresponding to  
      the subexpressions we're currently inside, plus the number of such  
      registers, and, finally, two char *'s.  The first char * is where  
      to resume scanning the pattern; the second one is where to resume  
      scanning the strings.  If the latter is zero, the failure point is  
      a ``dummy''; if a failure happens and the failure point is a dummy,  
      it gets discarded and the next next one is tried.  */  
 #ifdef MATCH_MAY_ALLOCATE /* otherwise, this is global.  */  
   PREFIX(fail_stack_type) fail_stack;  
 #endif  
 #ifdef DEBUG  
   static unsigned failure_id;  
   unsigned nfailure_points_pushed = 0, nfailure_points_popped = 0;  
 #endif  
   
 #ifdef REL_ALLOC  
   /* This holds the pointer to the failure stack, when  
      it is allocated relocatably.  */  
   fail_stack_elt_t *failure_stack_ptr;  
 #endif  
   
   /* We fill all the registers internally, independent of what we  
      return, for use in backreferences.  The number here includes  
      an element for register zero.  */  
   size_t num_regs = bufp->re_nsub + 1;  
   
   /* The currently active registers.  */  
   active_reg_t lowest_active_reg = NO_LOWEST_ACTIVE_REG;  
   active_reg_t highest_active_reg = NO_HIGHEST_ACTIVE_REG;  
   
   /* Information on the contents of registers. These are pointers into  
      the input strings; they record just what was matched (on this  
      attempt) by a subexpression part of the pattern, that is, the  
      regnum-th regstart pointer points to where in the pattern we began  
      matching and the regnum-th regend points to right after where we  
      stopped matching the regnum-th subexpression.  (The zeroth register  
      keeps track of what the whole pattern matches.)  */  
 #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global.  */  
   const CHAR_T **regstart, **regend;  
 #endif  
   
   /* If a group that's operated upon by a repetition operator fails to  
      match anything, then the register for its start will need to be  
      restored because it will have been set to wherever in the string we  
      are when we last see its open-group operator.  Similarly for a  
      register's end.  */  
 #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global.  */  
   const CHAR_T **old_regstart, **old_regend;  
 #endif  
   
   /* The is_active field of reg_info helps us keep track of which (possibly  
      nested) subexpressions we are currently in. The matched_something  
      field of reg_info[reg_num] helps us tell whether or not we have  
      matched any of the pattern so far this time through the reg_num-th  
      subexpression.  These two fields get reset each time through any  
      loop their register is in.  */  
 #ifdef MATCH_MAY_ALLOCATE /* otherwise, this is global.  */  
   PREFIX(register_info_type) *reg_info;  
 #endif  
   
   /* The following record the register info as found in the above  
      variables when we find a match better than any we've seen before.  
      This happens as we backtrack through the failure points, which in  
      turn happens only if we have not yet matched the entire string. */  
   unsigned best_regs_set = false;  
 #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global.  */  
   const CHAR_T **best_regstart, **best_regend;  
 #endif  
   
   /* Logically, this is `best_regend[0]'.  But we don't want to have to  
      allocate space for that if we're not allocating space for anything  
      else (see below).  Also, we never need info about register 0 for  
      any of the other register vectors, and it seems rather a kludge to  
      treat `best_regend' differently than the rest.  So we keep track of  
      the end of the best match so far in a separate variable.  We  
      initialize this to NULL so that when we backtrack the first time  
      and need to test it, it's not garbage.  */  
   const CHAR_T *match_end = NULL;  
   
   /* This helps SET_REGS_MATCHED avoid doing redundant work.  */  
   int set_regs_matched_done = 0;  
   
   /* Used when we pop values we don't care about.  */  
 #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global.  */  
   const CHAR_T **reg_dummy;  
   PREFIX(register_info_type) *reg_info_dummy;  
 #endif  
   
 #ifdef DEBUG  
   /* Counts the total number of registers pushed.  */  
   unsigned num_regs_pushed = 0;  
 #endif  
   
   /* Definitions for state transitions.  More efficiently for gcc.  */  
 #ifdef __GNUC__  
 # if defined HAVE_SUBTRACT_LOCAL_LABELS && defined SHARED  
 #  define NEXT \  
       do                                                                      \  
         {                                                                     \  
           int offset;                                                         \  
           const void *__unbounded ptr;                                        \  
           offset = (p == pend                                                 \  
                     ? 0 : jmptable[SWITCH_ENUM_CAST ((re_opcode_t) *p++)]);   \  
           ptr = &&end_of_pattern + offset;                                    \  
           goto *ptr;                                                          \  
         }                                                                     \  
       while (0)  
 #  define REF(x) \  
   &&label_##x - &&end_of_pattern  
 #  define JUMP_TABLE_TYPE const int  
 # else  
 #  define NEXT \  
       do                                                                      \  
         {                                                                     \  
           const void *__unbounded ptr;                                        \  
           ptr = (p == pend ? &&end_of_pattern                                 \  
                  : jmptable[SWITCH_ENUM_CAST ((re_opcode_t) *p++)]);          \  
           goto *ptr;                                                          \  
         }                                                                     \  
       while (0)  
 #  define REF(x) \  
   &&label_##x  
 #  define JUMP_TABLE_TYPE const void *const  
 # endif  
 # define CASE(x) label_##x  
   static JUMP_TABLE_TYPE jmptable[] =  
     {  
     REF (no_op),  
     REF (succeed),  
     REF (exactn),  
 # ifdef MBS_SUPPORT  
     REF (exactn_bin),  
 # endif  
     REF (anychar),  
     REF (charset),  
     REF (charset_not),  
     REF (start_memory),  
     REF (stop_memory),  
     REF (duplicate),  
     REF (begline),  
     REF (endline),  
     REF (begbuf),  
     REF (endbuf),  
     REF (jump),  
     REF (jump_past_alt),  
     REF (on_failure_jump),  
     REF (on_failure_keep_string_jump),  
     REF (pop_failure_jump),  
     REF (maybe_pop_jump),  
     REF (dummy_failure_jump),  
     REF (push_dummy_failure),  
     REF (succeed_n),  
     REF (jump_n),  
     REF (set_number_at),  
     REF (wordchar),  
     REF (notwordchar),  
     REF (wordbeg),  
     REF (wordend),  
     REF (wordbound),  
     REF (notwordbound)  
 # ifdef emacs  
     ,REF (before_dot),  
     REF (at_dot),  
     REF (after_dot),  
     REF (syntaxspec),  
     REF (notsyntaxspec)  
 # endif  
     };  
 #else  
 # define NEXT \  
   break  
 # define CASE(x) \  
   case x  
 #endif  
   
   DEBUG_PRINT1 ("\n\nEntering re_match_2.\n");  
   
   INIT_FAIL_STACK ();  
   
 #ifdef MATCH_MAY_ALLOCATE  
   /* Do not bother to initialize all the register variables if there are  
      no groups in the pattern, as it takes a fair amount of time.  If  
      there are groups, we include space for register 0 (the whole  
      pattern), even though we never use it, since it simplifies the  
      array indexing.  We should fix this.  */  
   if (bufp->re_nsub)  
     {  
       regstart = REGEX_TALLOC (num_regs, const CHAR_T *);  
       regend = REGEX_TALLOC (num_regs, const CHAR_T *);  
       old_regstart = REGEX_TALLOC (num_regs, const CHAR_T *);  
       old_regend = REGEX_TALLOC (num_regs, const CHAR_T *);  
       best_regstart = REGEX_TALLOC (num_regs, const CHAR_T *);  
       best_regend = REGEX_TALLOC (num_regs, const CHAR_T *);  
       reg_info = REGEX_TALLOC (num_regs, PREFIX(register_info_type));  
       reg_dummy = REGEX_TALLOC (num_regs, const CHAR_T *);  
       reg_info_dummy = REGEX_TALLOC (num_regs, PREFIX(register_info_type));  
   
       if (!(regstart && regend && old_regstart && old_regend && reg_info  
             && best_regstart && best_regend && reg_dummy && reg_info_dummy))  
         {  
           FREE_VARIABLES ();  
           return -2;  
         }  
     }  
   else  
     {  
       /* We must initialize all our variables to NULL, so that  
          `FREE_VARIABLES' doesn't try to free them.  */  
       regstart = regend = old_regstart = old_regend = best_regstart  
         = best_regend = reg_dummy = NULL;  
       reg_info = reg_info_dummy = (PREFIX(register_info_type) *) NULL;  
     }  
 #endif /* MATCH_MAY_ALLOCATE */  
   
   /* The starting position is bogus.  */  
 #ifdef WCHAR  
   if (pos < 0 || pos > csize1 + csize2)  
 #else /* BYTE */  
   if (pos < 0 || pos > size1 + size2)  
 #endif  
     {  
       FREE_VARIABLES ();  
       return -1;  
     }  
   
 #ifdef WCHAR  
   /* Allocate wchar_t array for string1 and string2 and  
      fill them with converted string.  */  
   if (string1 == NULL && string2 == NULL)  
     {  
       /* We need seting up buffers here.  */  
   
       /* We must free wcs buffers in this function.  */  
       cant_free_wcs_buf = 0;  
   
       if (csize1 != 0)  
         {  
           string1 = REGEX_TALLOC (csize1 + 1, CHAR_T);  
           mbs_offset1 = REGEX_TALLOC (csize1 + 1, int);  
           is_binary = REGEX_TALLOC (csize1 + 1, char);  
           if (!string1 || !mbs_offset1 || !is_binary)  
             {  
               FREE_VAR (string1);  
               FREE_VAR (mbs_offset1);  
               FREE_VAR (is_binary);  
               return -2;  
             }  
         }  
       if (csize2 != 0)  
         {  
           string2 = REGEX_TALLOC (csize2 + 1, CHAR_T);  
           mbs_offset2 = REGEX_TALLOC (csize2 + 1, int);  
           is_binary = REGEX_TALLOC (csize2 + 1, char);  
           if (!string2 || !mbs_offset2 || !is_binary)  
             {  
               FREE_VAR (string1);  
               FREE_VAR (mbs_offset1);  
               FREE_VAR (string2);  
               FREE_VAR (mbs_offset2);  
               FREE_VAR (is_binary);  
               return -2;  
             }  
           size2 = convert_mbs_to_wcs(string2, cstring2, csize2,  
                                      mbs_offset2, is_binary);  
           string2[size2] = L'\0'; /* for a sentinel  */  
           FREE_VAR (is_binary);  
         }  
     }  
   
   /* We need to cast pattern to (wchar_t*), because we casted this compiled  
      pattern to (char*) in regex_compile.  */  
   p = pattern = (CHAR_T*)bufp->buffer;  
   pend = (CHAR_T*)(bufp->buffer + bufp->used);  
   
 #endif /* WCHAR */  
   
   /* Initialize subexpression text positions to -1 to mark ones that no  
      start_memory/stop_memory has been seen for. Also initialize the  
      register information struct.  */  
   for (mcnt = 1; (unsigned) mcnt < num_regs; mcnt++)  
     {  
       regstart[mcnt] = regend[mcnt]  
         = old_regstart[mcnt] = old_regend[mcnt] = REG_UNSET_VALUE;  
   
       REG_MATCH_NULL_STRING_P (reg_info[mcnt]) = MATCH_NULL_UNSET_VALUE;  
       IS_ACTIVE (reg_info[mcnt]) = 0;  
       MATCHED_SOMETHING (reg_info[mcnt]) = 0;  
       EVER_MATCHED_SOMETHING (reg_info[mcnt]) = 0;  
     }  
   
   /* We move `string1' into `string2' if the latter's empty -- but not if  
      `string1' is null.  */  
   if (size2 == 0 && string1 != NULL)  
     {  
       string2 = string1;  
       size2 = size1;  
       string1 = 0;  
       size1 = 0;  
 #ifdef WCHAR  
       mbs_offset2 = mbs_offset1;  
       csize2 = csize1;  
       mbs_offset1 = NULL;  
       csize1 = 0;  
 #endif  
     }  
   end1 = string1 + size1;  
   end2 = string2 + size2;  
   
   /* Compute where to stop matching, within the two strings.  */  
 #ifdef WCHAR  
   if (stop <= csize1)  
     {  
       mcnt = count_mbs_length(mbs_offset1, stop);  
       end_match_1 = string1 + mcnt;  
       end_match_2 = string2;  
     }  
   else  
     {  
       if (stop > csize1 + csize2)  
         stop = csize1 + csize2;  
       end_match_1 = end1;  
       mcnt = count_mbs_length(mbs_offset2, stop-csize1);  
       end_match_2 = string2 + mcnt;  
     }  
   if (mcnt < 0)  
     { /* count_mbs_length return error.  */  
       FREE_VARIABLES ();  
       return -1;  
     }  
 #else  
   if (stop <= size1)  
     {  
       end_match_1 = string1 + stop;  
       end_match_2 = string2;  
     }  
   else  
     {  
       end_match_1 = end1;  
       end_match_2 = string2 + stop - size1;  
     }  
 #endif /* WCHAR */  
   
   /* `p' scans through the pattern as `d' scans through the data.  
      `dend' is the end of the input string that `d' points within.  `d'  
      is advanced into the following input string whenever necessary, but  
      this happens before fetching; therefore, at the beginning of the  
      loop, `d' can be pointing at the end of a string, but it cannot  
      equal `string2'.  */  
 #ifdef WCHAR  
   if (size1 > 0 && pos <= csize1)  
     {  
       mcnt = count_mbs_length(mbs_offset1, pos);  
       d = string1 + mcnt;  
       dend = end_match_1;  
     }  
   else  
     {  
       mcnt = count_mbs_length(mbs_offset2, pos-csize1);  
       d = string2 + mcnt;  
       dend = end_match_2;  
     }  
   
   if (mcnt < 0)  
     { /* count_mbs_length return error.  */  
       FREE_VARIABLES ();  
       return -1;  
     }  
 #else  
   if (size1 > 0 && pos <= size1)  
     {  
       d = string1 + pos;  
       dend = end_match_1;  
     }  
   else  
     {  
       d = string2 + pos - size1;  
       dend = end_match_2;  
     }  
 #endif /* WCHAR */  
   
   DEBUG_PRINT1 ("The compiled pattern is:\n");  
   DEBUG_PRINT_COMPILED_PATTERN (bufp, p, pend);  
   DEBUG_PRINT1 ("The string to match is: `");  
   DEBUG_PRINT_DOUBLE_STRING (d, string1, size1, string2, size2);  
   DEBUG_PRINT1 ("'\n");  
   
   /* This loops over pattern commands.  It exits by returning from the  
      function if the match is complete, or it drops through if the match  
      fails at this starting point in the input data.  */  
   for (;;)  
     {  
 #ifdef _LIBC  
       DEBUG_PRINT2 ("\n%p: ", p);  
 #else  
       DEBUG_PRINT2 ("\n0x%x: ", p);  
 #endif  
   
 #ifdef __GNUC__  
       NEXT;  
 #else  
       if (p == pend)  
 #endif  
         {  
 #ifdef __GNUC__  
         end_of_pattern:  
 #endif  
           /* End of pattern means we might have succeeded.  */  
           DEBUG_PRINT1 ("end of pattern ... ");  
   
           /* If we haven't matched the entire string, and we want the  
              longest match, try backtracking.  */  
           if (d != end_match_2)  
             {  
               /* 1 if this match is the best seen so far.  */  
               boolean best_match_p;  
   
               {  
                 /* 1 if this match ends in the same string (string1 or string2)  
                    as the best previous match.  */  
                 boolean same_str_p = (FIRST_STRING_P (match_end)  
                                       == MATCHING_IN_FIRST_STRING);  
   
                 /* AIX compiler got confused when this was combined  
                    with the previous declaration.  */  
                 if (same_str_p)  
                   best_match_p = d > match_end;  
                 else  
                   best_match_p = !MATCHING_IN_FIRST_STRING;  
               }  
   
               DEBUG_PRINT1 ("backtracking.\n");  
   
               if (!FAIL_STACK_EMPTY ())  
                 { /* More failure points to try.  */  
   
                   /* If exceeds best match so far, save it.  */  
                   if (!best_regs_set || best_match_p)  
                     {  
                       best_regs_set = true;  
                       match_end = d;  
   
                       DEBUG_PRINT1 ("\nSAVING match as best so far.\n");  
   
                       for (mcnt = 1; (unsigned) mcnt < num_regs; mcnt++)  
                         {  
                           best_regstart[mcnt] = regstart[mcnt];  
                           best_regend[mcnt] = regend[mcnt];  
                         }  
                     }  
                   goto fail;  
                 }  
   
               /* If no failure points, don't restore garbage.  And if  
                  last match is real best match, don't restore second  
                  best one. */  
               else if (best_regs_set && !best_match_p)  
                 {  
                 restore_best_regs:  
                   /* Restore best match.  It may happen that `dend ==  
                      end_match_1' while the restored d is in string2.  
                      For example, the pattern `x.*y.*z' against the  
                      strings `x-' and `y-z-', if the two strings are  
                      not consecutive in memory.  */  
                   DEBUG_PRINT1 ("Restoring best registers.\n");  
   
                   d = match_end;  
                   dend = ((d >= string1 && d <= end1)  
                           ? end_match_1 : end_match_2);  
   
                   for (mcnt = 1; (unsigned) mcnt < num_regs; mcnt++)  
                     {  
                       regstart[mcnt] = best_regstart[mcnt];  
                       regend[mcnt] = best_regend[mcnt];  
                     }  
                 }  
             } /* d != end_match_2 */  
   
         succeed_label:  
           DEBUG_PRINT1 ("Accepting match.\n");  
           /* If caller wants register contents data back, do it.  */  
           if (regs && !bufp->no_sub)  
             {  
               /* Have the register data arrays been allocated?  */  
               if (bufp->regs_allocated == REGS_UNALLOCATED)  
                 { /* No.  So allocate them with malloc.  We need one  
                      extra element beyond `num_regs' for the `-1' marker  
                      GNU code uses.  */  
                   regs->num_regs = MAX (RE_NREGS, num_regs + 1);  
                   regs->start = TALLOC (regs->num_regs, regoff_t);  
                   regs->end = TALLOC (regs->num_regs, regoff_t);  
                   if (regs->start == NULL || regs->end == NULL)  
                     {  
                       FREE_VARIABLES ();  
                       return -2;  
                     }  
                   bufp->regs_allocated = REGS_REALLOCATE;  
                 }  
               else if (bufp->regs_allocated == REGS_REALLOCATE)  
                 { /* Yes.  If we need more elements than were already  
                      allocated, reallocate them.  If we need fewer, just  
                      leave it alone.  */  
                   if (regs->num_regs < num_regs + 1)  
                     {  
                       regs->num_regs = num_regs + 1;  
                       RETALLOC (regs->start, regs->num_regs, regoff_t);  
                       RETALLOC (regs->end, regs->num_regs, regoff_t);  
                       if (regs->start == NULL || regs->end == NULL)  
                         {  
                           FREE_VARIABLES ();  
                           return -2;  
                         }  
                     }  
                 }  
               else  
                 {  
                   /* These braces fend off a "empty body in an else-statement"  
                      warning under GCC when assert expands to nothing.  */  
                   assert (bufp->regs_allocated == REGS_FIXED);  
                 }  
   
               /* Convert the pointer data in `regstart' and `regend' to  
                  indices.  Register zero has to be set differently,  
                  since we haven't kept track of any info for it.  */  
               if (regs->num_regs > 0)  
                 {  
                   regs->start[0] = pos;  
 #ifdef WCHAR  
                   if (MATCHING_IN_FIRST_STRING)  
                     regs->end[0] = (mbs_offset1 != NULL ?  
                                     mbs_offset1[d-string1] : 0);  
                   else  
                     regs->end[0] = csize1 + (mbs_offset2 != NULL  
                                              ? mbs_offset2[d-string2] : 0);  
 #else  
                   regs->end[0] = (MATCHING_IN_FIRST_STRING  
                                   ? ((regoff_t) (d - string1))  
                                   : ((regoff_t) (d - string2 + size1)));  
 #endif /* WCHAR */  
                 }  
   
               /* Go through the first `min (num_regs, regs->num_regs)'  
                  registers, since that is all we initialized.  */  
               for (mcnt = 1; (unsigned) mcnt < MIN (num_regs, regs->num_regs);  
                    mcnt++)  
                 {  
                   if (REG_UNSET (regstart[mcnt]) || REG_UNSET (regend[mcnt]))  
                     regs->start[mcnt] = regs->end[mcnt] = -1;  
                   else  
                     {  
                       regs->start[mcnt]  
                         = (regoff_t) POINTER_TO_OFFSET (regstart[mcnt]);  
                       regs->end[mcnt]  
                         = (regoff_t) POINTER_TO_OFFSET (regend[mcnt]);  
                     }  
                 }  
   
               /* If the regs structure we return has more elements than  
                  were in the pattern, set the extra elements to -1.  If  
                  we (re)allocated the registers, this is the case,  
                  because we always allocate enough to have at least one  
                  -1 at the end.  */  
               for (mcnt = num_regs; (unsigned) mcnt < regs->num_regs; mcnt++)  
                 regs->start[mcnt] = regs->end[mcnt] = -1;  
             } /* regs && !bufp->no_sub */  
   
           DEBUG_PRINT4 ("%u failure points pushed, %u popped (%u remain).\n",  
                         nfailure_points_pushed, nfailure_points_popped,  
                         nfailure_points_pushed - nfailure_points_popped);  
           DEBUG_PRINT2 ("%u registers pushed.\n", num_regs_pushed);  
   
 #ifdef WCHAR  
           if (MATCHING_IN_FIRST_STRING)  
             mcnt = mbs_offset1 != NULL ? mbs_offset1[d-string1] : 0;  
           else  
             mcnt = (mbs_offset2 != NULL ? mbs_offset2[d-string2] : 0) +  
               csize1;  
           mcnt -= pos;  
 #else  
           mcnt = d - pos - (MATCHING_IN_FIRST_STRING  
                             ? string1 : string2 - size1);  
 #endif /* WCHAR */  
   
           DEBUG_PRINT2 ("Returning %d from re_match_2.\n", mcnt);  
   
           FREE_VARIABLES ();  
           return mcnt;  
         }  
   
 #ifndef __GNUC__  
       /* Otherwise match next pattern command.  */  
       switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++))  
         {  
 #endif  
         /* Ignore these.  Used to ignore the n of succeed_n's which  
            currently have n == 0.  */  
         CASE (no_op):  
           DEBUG_PRINT1 ("EXECUTING no_op.\n");  
           NEXT;  
   
         CASE (succeed):  
           DEBUG_PRINT1 ("EXECUTING succeed.\n");  
           goto succeed_label;  
   
         /* Match the next n pattern characters exactly.  The following  
            byte in the pattern defines n, and the n bytes after that  
            are the characters to match.  */  
         CASE (exactn):  
 #ifdef MBS_SUPPORT  
         CASE (exactn_bin):  
 #endif  
           mcnt = *p++;  
           DEBUG_PRINT2 ("EXECUTING exactn %d.\n", mcnt);  
   
           /* This is written out as an if-else so we don't waste time  
              testing `translate' inside the loop.  */  
           if (translate)  
             {  
               do  
                 {  
                   PREFETCH ();  
 #ifdef WCHAR  
                   if (*d <= 0xff)  
                     {  
                       if ((UCHAR_T) translate[(unsigned char) *d++]  
                           != (UCHAR_T) *p++)  
                         goto fail;  
                     }  
                   else  
                     {  
                       if (*d++ != (CHAR_T) *p++)  
                         goto fail;  
                     }  
 #else  
                   if ((UCHAR_T) translate[(unsigned char) *d++]  
                       != (UCHAR_T) *p++)  
                     goto fail;  
 #endif /* WCHAR */  
                 }  
               while (--mcnt);  
             }  
           else  
             {  
               do  
                 {  
                   PREFETCH ();  
                   if (*d++ != (CHAR_T) *p++) goto fail;  
                 }  
               while (--mcnt);  
             }  
           SET_REGS_MATCHED ();  
           NEXT;  
   
   
         /* Match any character except possibly a newline or a null.  */  
         CASE (anychar):  
           DEBUG_PRINT1 ("EXECUTING anychar.\n");  
   
           PREFETCH ();  
   
           if ((!(bufp->syntax & RE_DOT_NEWLINE) && TRANSLATE (*d) == '\n')  
               || (bufp->syntax & RE_DOT_NOT_NULL && TRANSLATE (*d) == '\000'))  
             goto fail;  
   
           SET_REGS_MATCHED ();  
           DEBUG_PRINT2 ("  Matched `%ld'.\n", (long int) *d);  
           d++;  
           NEXT;  
   
   
         CASE (charset):  
         CASE (charset_not):  
           {  
             register UCHAR_T c;  
 #ifdef WCHAR  
             unsigned int i, char_class_length, coll_symbol_length,  
               equiv_class_length, ranges_length, chars_length, length;  
             CHAR_T *workp, *workp2, *charset_top;  
 #define WORK_BUFFER_SIZE 128  
             CHAR_T str_buf[WORK_BUFFER_SIZE];  
 # ifdef _LIBC  
             uint32_t nrules;  
 # endif /* _LIBC */  
 #endif /* WCHAR */  
             boolean negate = (re_opcode_t) *(p - 1) == charset_not;  
   
             DEBUG_PRINT2 ("EXECUTING charset%s.\n", negate ? "_not" : "");  
             PREFETCH ();  
             c = TRANSLATE (*d); /* The character to match.  */  
 #ifdef WCHAR  
 # ifdef _LIBC  
             nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);  
 # endif /* _LIBC */  
             charset_top = p - 1;  
             char_class_length = *p++;  
             coll_symbol_length = *p++;  
             equiv_class_length = *p++;  
             ranges_length = *p++;  
             chars_length = *p++;  
             /* p points charset[6], so the address of the next instruction  
                (charset[l+m+n+2o+k+p']) equals p[l+m+n+2*o+p'],  
                where l=length of char_classes, m=length of collating_symbol,  
                n=equivalence_class, o=length of char_range,  
                p'=length of character.  */  
             workp = p;  
             /* Update p to indicate the next instruction.  */  
             p += char_class_length + coll_symbol_length+ equiv_class_length +  
               2*ranges_length + chars_length;  
   
             /* match with char_class?  */  
             for (i = 0; i < char_class_length ; i += CHAR_CLASS_SIZE)  
               {  
                 wctype_t wctype;  
                 uintptr_t alignedp = ((uintptr_t)workp  
                                       + __alignof__(wctype_t) - 1)  
                                       & ~(uintptr_t)(__alignof__(wctype_t) - 1);  
                 wctype = *((wctype_t*)alignedp);  
                 workp += CHAR_CLASS_SIZE;  
                 if (iswctype((wint_t)c, wctype))  
                   goto char_set_matched;  
               }  
   
             /* match with collating_symbol?  */  
 # ifdef _LIBC  
             if (nrules != 0)  
               {  
                 const unsigned char *extra = (const unsigned char *)  
                   _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB);  
   
                 for (workp2 = workp + coll_symbol_length ; workp < workp2 ;  
                      workp++)  
                   {  
                     int32_t *wextra;  
                     wextra = (int32_t*)(extra + *workp++);  
                     for (i = 0; i < *wextra; ++i)  
                       if (TRANSLATE(d[i]) != wextra[1 + i])  
                         break;  
   
                     if (i == *wextra)  
                       {  
                         /* Update d, however d will be incremented at  
                            char_set_matched:, we decrement d here.  */  
                         d += i - 1;  
                         goto char_set_matched;  
                       }  
                   }  
               }  
             else /* (nrules == 0) */  
 # endif  
               /* If we can't look up collation data, we use wcscoll  
                  instead.  */  
               {  
                 for (workp2 = workp + coll_symbol_length ; workp < workp2 ;)  
                   {  
                     const CHAR_T *backup_d = d, *backup_dend = dend;  
                     length = wcslen (workp);  
   
                     /* If wcscoll(the collating symbol, whole string) > 0,  
                        any substring of the string never match with the  
                        collating symbol.  */  
                     if (wcscoll (workp, d) > 0)  
                       {  
                         workp += length + 1;  
                         continue;  
                       }  
   
                     /* First, we compare the collating symbol with  
                        the first character of the string.  
                        If it don't match, we add the next character to  
                        the compare buffer in turn.  */  
                     for (i = 0 ; i < WORK_BUFFER_SIZE-1 ; i++, d++)  
                       {  
                         int match;  
                         if (d == dend)  
                           {  
                             if (dend == end_match_2)  
                               break;  
                             d = string2;  
                             dend = end_match_2;  
                           }  
   
                         /* add next character to the compare buffer.  */  
                         str_buf[i] = TRANSLATE(*d);  
                         str_buf[i+1] = '\0';  
   
                         match = wcscoll (workp, str_buf);  
                         if (match == 0)  
                           goto char_set_matched;  
   
                         if (match < 0)  
                           /* (str_buf > workp) indicate (str_buf + X > workp),  
                              because for all X (str_buf + X > str_buf).  
                              So we don't need continue this loop.  */  
                           break;  
   
                         /* Otherwise(str_buf < workp),  
                            (str_buf+next_character) may equals (workp).  
                            So we continue this loop.  */  
                       }  
                     /* not matched */  
                     d = backup_d;  
                     dend = backup_dend;  
                     workp += length + 1;  
                   }  
               }  
             /* match with equivalence_class?  */  
 # ifdef _LIBC  
             if (nrules != 0)  
               {  
                 const CHAR_T *backup_d = d, *backup_dend = dend;  
                 /* Try to match the equivalence class against  
                    those known to the collate implementation.  */  
                 const int32_t *table;  
                 const int32_t *weights;  
                 const int32_t *extra;  
                 const int32_t *indirect;  
                 int32_t idx, idx2;  
                 wint_t *cp;  
                 size_t len;  
   
                 /* This #include defines a local function!  */  
 #  include <locale/weightwc.h>  
   
                 table = (const int32_t *)  
                   _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEWC);  
                 weights = (const wint_t *)  
                   _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTWC);  
                 extra = (const wint_t *)  
                   _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAWC);  
                 indirect = (const int32_t *)  
                   _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTWC);  
   
                 /* Write 1 collating element to str_buf, and  
                    get its index.  */  
                 idx2 = 0;  
   
                 for (i = 0 ; idx2 == 0 && i < WORK_BUFFER_SIZE - 1; i++)  
                   {  
                     cp = (wint_t*)str_buf;  
                     if (d == dend)  
                       {  
                         if (dend == end_match_2)  
                           break;  
                         d = string2;  
                         dend = end_match_2;  
                       }  
                     str_buf[i] = TRANSLATE(*(d+i));  
                     str_buf[i+1] = '\0'; /* sentinel */  
                     idx2 = findidx ((const wint_t**)&cp);  
                   }  
   
                 /* Update d, however d will be incremented at  
                    char_set_matched:, we decrement d here.  */  
                 d = backup_d + ((wchar_t*)cp - (wchar_t*)str_buf - 1);  
                 if (d >= dend)  
                   {  
                     if (dend == end_match_2)  
                         d = dend;  
                     else  
                       {  
                         d = string2;  
                         dend = end_match_2;  
                       }  
                   }  
   
                 len = weights[idx2];  
   
                 for (workp2 = workp + equiv_class_length ; workp < workp2 ;  
                      workp++)  
                   {  
                     idx = (int32_t)*workp;  
                     /* We already checked idx != 0 in regex_compile. */  
   
                     if (idx2 != 0 && len == weights[idx])  
                       {  
                         int cnt = 0;  
                         while (cnt < len && (weights[idx + 1 + cnt]  
                                              == weights[idx2 + 1 + cnt]))  
                           ++cnt;  
   
                         if (cnt == len)  
                           goto char_set_matched;  
                       }  
                   }  
                 /* not matched */  
                 d = backup_d;  
                 dend = backup_dend;  
               }  
             else /* (nrules == 0) */  
 # endif  
               /* If we can't look up collation data, we use wcscoll  
                  instead.  */  
               {  
                 for (workp2 = workp + equiv_class_length ; workp < workp2 ;)  
                   {  
                     const CHAR_T *backup_d = d, *backup_dend = dend;  
                     length = wcslen (workp);  
   
                     /* If wcscoll(the collating symbol, whole string) > 0,  
                        any substring of the string never match with the  
                        collating symbol.  */  
                     if (wcscoll (workp, d) > 0)  
                       {  
                         workp += length + 1;  
                         break;  
                       }  
   
                     /* First, we compare the equivalence class with  
                        the first character of the string.  
                        If it don't match, we add the next character to  
                        the compare buffer in turn.  */  
                     for (i = 0 ; i < WORK_BUFFER_SIZE - 1 ; i++, d++)  
                       {  
                         int match;  
                         if (d == dend)  
                           {  
                             if (dend == end_match_2)  
                               break;  
                             d = string2;  
                             dend = end_match_2;  
                           }  
   
                         /* add next character to the compare buffer.  */  
                         str_buf[i] = TRANSLATE(*d);  
                         str_buf[i+1] = '\0';  
   
                         match = wcscoll (workp, str_buf);  
   
                         if (match == 0)  
                           goto char_set_matched;  
   
                         if (match < 0)  
                         /* (str_buf > workp) indicate (str_buf + X > workp),  
                            because for all X (str_buf + X > str_buf).  
                            So we don't need continue this loop.  */  
                           break;  
   
                         /* Otherwise(str_buf < workp),  
                            (str_buf+next_character) may equals (workp).  
                            So we continue this loop.  */  
                       }  
                     /* not matched */  
                     d = backup_d;  
                     dend = backup_dend;  
                     workp += length + 1;  
                   }  
               }  
   
             /* match with char_range?  */  
 # ifdef _LIBC  
             if (nrules != 0)  
               {  
                 uint32_t collseqval;  
                 const char *collseq = (const char *)  
                   _NL_CURRENT(LC_COLLATE, _NL_COLLATE_COLLSEQWC);  
   
                 collseqval = collseq_table_lookup (collseq, c);  
   
                 for (; workp < p - chars_length ;)  
                   {  
                     uint32_t start_val, end_val;  
   
                     /* We already compute the collation sequence value  
                        of the characters (or collating symbols).  */  
                     start_val = (uint32_t) *workp++; /* range_start */  
                     end_val = (uint32_t) *workp++; /* range_end */  
   
                     if (start_val <= collseqval && collseqval <= end_val)  
                       goto char_set_matched;  
                   }  
               }  
             else  
 # endif  
               {  
                 /* We set range_start_char at str_buf[0], range_end_char  
                    at str_buf[4], and compared char at str_buf[2].  */  
                 str_buf[1] = 0;  
                 str_buf[2] = c;  
                 str_buf[3] = 0;  
                 str_buf[5] = 0;  
                 for (; workp < p - chars_length ;)  
                   {  
                     wchar_t *range_start_char, *range_end_char;  
   
                     /* match if (range_start_char <= c <= range_end_char).  */  
   
                     /* If range_start(or end) < 0, we assume -range_start(end)  
                        is the offset of the collating symbol which is specified  
                        as the character of the range start(end).  */  
   
                     /* range_start */  
                     if (*workp < 0)  
                       range_start_char = charset_top - (*workp++);  
                     else  
                       {  
                         str_buf[0] = *workp++;  
                         range_start_char = str_buf;  
                       }  
   
                     /* range_end */  
                     if (*workp < 0)  
                       range_end_char = charset_top - (*workp++);  
                     else  
                       {  
                         str_buf[4] = *workp++;  
                         range_end_char = str_buf + 4;  
                       }  
   
                     if (wcscoll (range_start_char, str_buf+2) <= 0  
                         && wcscoll (str_buf+2, range_end_char) <= 0)  
                       goto char_set_matched;  
                   }  
               }  
   
             /* match with char?  */  
             for (; workp < p ; workp++)  
               if (c == *workp)  
                 goto char_set_matched;  
   
             negate = !negate;  
   
           char_set_matched:  
             if (negate) goto fail;  
 #else  
             /* Cast to `unsigned' instead of `unsigned char' in case the  
                bit list is a full 32 bytes long.  */  
             if (c < (unsigned) (*p * BYTEWIDTH)  
                 && p[1 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH)))  
               negate = !negate;  
   
             p += 1 + *p;  
   
             if (!negate) goto fail;  
 #undef WORK_BUFFER_SIZE  
 #endif /* WCHAR */  
             SET_REGS_MATCHED ();  
             d++;  
             NEXT;  
           }  
   
   
         /* The beginning of a group is represented by start_memory.  
            The arguments are the register number in the next byte, and the  
            number of groups inner to this one in the next.  The text  
            matched within the group is recorded (in the internal  
            registers data structure) under the register number.  */  
         CASE (start_memory):  
           DEBUG_PRINT3 ("EXECUTING start_memory %ld (%ld):\n",  
                         (long int) *p, (long int) p[1]);  
   
           /* Find out if this group can match the empty string.  */  
           p1 = p;               /* To send to group_match_null_string_p.  */  
   
           if (REG_MATCH_NULL_STRING_P (reg_info[*p]) == MATCH_NULL_UNSET_VALUE)  
             REG_MATCH_NULL_STRING_P (reg_info[*p])  
               = PREFIX(group_match_null_string_p) (&p1, pend, reg_info);  
   
           /* Save the position in the string where we were the last time  
              we were at this open-group operator in case the group is  
              operated upon by a repetition operator, e.g., with `(a*)*b'  
              against `ab'; then we want to ignore where we are now in  
              the string in case this attempt to match fails.  */  
           old_regstart[*p] = REG_MATCH_NULL_STRING_P (reg_info[*p])  
                              ? REG_UNSET (regstart[*p]) ? d : regstart[*p]  
                              : regstart[*p];  
           DEBUG_PRINT2 ("  old_regstart: %d\n",  
                          POINTER_TO_OFFSET (old_regstart[*p]));  
   
           regstart[*p] = d;  
           DEBUG_PRINT2 ("  regstart: %d\n", POINTER_TO_OFFSET (regstart[*p]));  
   
           IS_ACTIVE (reg_info[*p]) = 1;  
           MATCHED_SOMETHING (reg_info[*p]) = 0;  
   
           /* Clear this whenever we change the register activity status.  */  
           set_regs_matched_done = 0;  
   
           /* This is the new highest active register.  */  
           highest_active_reg = *p;  
   
           /* If nothing was active before, this is the new lowest active  
              register.  */  
           if (lowest_active_reg == NO_LOWEST_ACTIVE_REG)  
             lowest_active_reg = *p;  
   
           /* Move past the register number and inner group count.  */  
           p += 2;  
           just_past_start_mem = p;  
   
           NEXT;  
   
   
         /* The stop_memory opcode represents the end of a group.  Its  
            arguments are the same as start_memory's: the register  
            number, and the number of inner groups.  */  
         CASE (stop_memory):  
           DEBUG_PRINT3 ("EXECUTING stop_memory %ld (%ld):\n",  
                         (long int) *p, (long int) p[1]);  
   
           /* We need to save the string position the last time we were at  
              this close-group operator in case the group is operated  
              upon by a repetition operator, e.g., with `((a*)*(b*)*)*'  
              against `aba'; then we want to ignore where we are now in  
              the string in case this attempt to match fails.  */  
           old_regend[*p] = REG_MATCH_NULL_STRING_P (reg_info[*p])  
                            ? REG_UNSET (regend[*p]) ? d : regend[*p]  
                            : regend[*p];  
           DEBUG_PRINT2 ("      old_regend: %d\n",  
                          POINTER_TO_OFFSET (old_regend[*p]));  
   
           regend[*p] = d;  
           DEBUG_PRINT2 ("      regend: %d\n", POINTER_TO_OFFSET (regend[*p]));  
   
           /* This register isn't active anymore.  */  
           IS_ACTIVE (reg_info[*p]) = 0;  
   
           /* Clear this whenever we change the register activity status.  */  
           set_regs_matched_done = 0;  
   
           /* If this was the only register active, nothing is active  
              anymore.  */  
           if (lowest_active_reg == highest_active_reg)  
             {  
               lowest_active_reg = NO_LOWEST_ACTIVE_REG;  
               highest_active_reg = NO_HIGHEST_ACTIVE_REG;  
             }  
           else  
             { /* We must scan for the new highest active register, since  
                  it isn't necessarily one less than now: consider  
                  (a(b)c(d(e)f)g).  When group 3 ends, after the f), the  
                  new highest active register is 1.  */  
               UCHAR_T r = *p - 1;  
               while (r > 0 && !IS_ACTIVE (reg_info[r]))  
                 r--;  
   
               /* If we end up at register zero, that means that we saved  
                  the registers as the result of an `on_failure_jump', not  
                  a `start_memory', and we jumped to past the innermost  
                  `stop_memory'.  For example, in ((.)*) we save  
                  registers 1 and 2 as a result of the *, but when we pop  
                  back to the second ), we are at the stop_memory 1.  
                  Thus, nothing is active.  */  
               if (r == 0)  
                 {  
                   lowest_active_reg = NO_LOWEST_ACTIVE_REG;  
                   highest_active_reg = NO_HIGHEST_ACTIVE_REG;  
                 }  
               else  
                 highest_active_reg = r;  
             }  
   
           /* If just failed to match something this time around with a  
              group that's operated on by a repetition operator, try to  
              force exit from the ``loop'', and restore the register  
              information for this group that we had before trying this  
              last match.  */  
           if ((!MATCHED_SOMETHING (reg_info[*p])  
                || just_past_start_mem == p - 1)  
               && (p + 2) < pend)  
             {  
               boolean is_a_jump_n = false;  
   
               p1 = p + 2;  
               mcnt = 0;  
               switch ((re_opcode_t) *p1++)  
                 {  
                   case jump_n:  
                     is_a_jump_n = true;  
                   case pop_failure_jump:  
                   case maybe_pop_jump:  
                   case jump:  
                   case dummy_failure_jump:  
                     EXTRACT_NUMBER_AND_INCR (mcnt, p1);  
                     if (is_a_jump_n)  
                       p1 += OFFSET_ADDRESS_SIZE;  
                     break;  
   
                   default:  
                     /* do nothing */ ;  
                 }  
               p1 += mcnt;  
   
               /* If the next operation is a jump backwards in the pattern  
                  to an on_failure_jump right before the start_memory  
                  corresponding to this stop_memory, exit from the loop  
                  by forcing a failure after pushing on the stack the  
                  on_failure_jump's jump in the pattern, and d.  */  
               if (mcnt < 0 && (re_opcode_t) *p1 == on_failure_jump  
                   && (re_opcode_t) p1[1+OFFSET_ADDRESS_SIZE] == start_memory  
                   && p1[2+OFFSET_ADDRESS_SIZE] == *p)  
                 {  
                   /* If this group ever matched anything, then restore  
                      what its registers were before trying this last  
                      failed match, e.g., with `(a*)*b' against `ab' for  
                      regstart[1], and, e.g., with `((a*)*(b*)*)*'  
                      against `aba' for regend[3].  
   
                      Also restore the registers for inner groups for,  
                      e.g., `((a*)(b*))*' against `aba' (register 3 would  
                      otherwise get trashed).  */  
   
                   if (EVER_MATCHED_SOMETHING (reg_info[*p]))  
                     {  
                       unsigned r;  
   
                       EVER_MATCHED_SOMETHING (reg_info[*p]) = 0;  
   
                       /* Restore this and inner groups' (if any) registers.  */  
                       for (r = *p; r < (unsigned) *p + (unsigned) *(p + 1);  
                            r++)  
                         {  
                           regstart[r] = old_regstart[r];  
   
                           /* xx why this test?  */  
                           if (old_regend[r] >= regstart[r])  
                             regend[r] = old_regend[r];  
                         }  
                     }  
                   p1++;  
                   EXTRACT_NUMBER_AND_INCR (mcnt, p1);  
                   PUSH_FAILURE_POINT (p1 + mcnt, d, -2);  
   
                   goto fail;  
                 }  
             }  
   
           /* Move past the register number and the inner group count.  */  
           p += 2;  
           NEXT;  
   
   
         /* \<digit> has been turned into a `duplicate' command which is  
            followed by the numeric value of <digit> as the register number.  */  
         CASE (duplicate):  
           {  
             register const CHAR_T *d2, *dend2;  
             int regno = *p++;   /* Get which register to match against.  */  
             DEBUG_PRINT2 ("EXECUTING duplicate %d.\n", regno);  
   
             /* Can't back reference a group which we've never matched.  */  
             if (REG_UNSET (regstart[regno]) || REG_UNSET (regend[regno]))  
               goto fail;  
   
             /* Where in input to try to start matching.  */  
             d2 = regstart[regno];  
   
             /* Where to stop matching; if both the place to start and  
                the place to stop matching are in the same string, then  
                set to the place to stop, otherwise, for now have to use  
                the end of the first string.  */  
   
             dend2 = ((FIRST_STRING_P (regstart[regno])  
                       == FIRST_STRING_P (regend[regno]))  
                      ? regend[regno] : end_match_1);  
             for (;;)  
               {  
                 /* If necessary, advance to next segment in register  
                    contents.  */  
                 while (d2 == dend2)  
                   {  
                     if (dend2 == end_match_2) break;  
                     if (dend2 == regend[regno]) break;  
   
                     /* End of string1 => advance to string2. */  
                     d2 = string2;  
                     dend2 = regend[regno];  
                   }  
                 /* At end of register contents => success */  
                 if (d2 == dend2) break;  
   
                 /* If necessary, advance to next segment in data.  */  
                 PREFETCH ();  
   
                 /* How many characters left in this segment to match.  */  
                 mcnt = dend - d;  
   
                 /* Want how many consecutive characters we can match in  
                    one shot, so, if necessary, adjust the count.  */  
                 if (mcnt > dend2 - d2)  
                   mcnt = dend2 - d2;  
   
                 /* Compare that many; failure if mismatch, else move  
                    past them.  */  
                 if (translate  
                     ? PREFIX(bcmp_translate) (d, d2, mcnt, translate)  
                     : memcmp (d, d2, mcnt*sizeof(UCHAR_T)))  
                   goto fail;  
                 d += mcnt, d2 += mcnt;  
   
                 /* Do this because we've match some characters.  */  
                 SET_REGS_MATCHED ();  
               }  
           }  
           NEXT;  
   
   
         /* begline matches the empty string at the beginning of the string  
            (unless `not_bol' is set in `bufp'), and, if  
            `newline_anchor' is set, after newlines.  */  
         CASE (begline):  
           DEBUG_PRINT1 ("EXECUTING begline.\n");  
   
           if (AT_STRINGS_BEG (d))  
             {  
               if (!bufp->not_bol)  
                 {  
                   NEXT;  
                 }  
             }  
           else if (d[-1] == '\n' && bufp->newline_anchor)  
             {  
               NEXT;  
             }  
           /* In all other cases, we fail.  */  
           goto fail;  
   
   
         /* endline is the dual of begline.  */  
         CASE (endline):  
           DEBUG_PRINT1 ("EXECUTING endline.\n");  
   
           if (AT_STRINGS_END (d))  
             {  
               if (!bufp->not_eol)  
                 {  
                   NEXT;  
                 }  
             }  
   
           /* We have to ``prefetch'' the next character.  */  
           else if ((d == end1 ? *string2 : *d) == '\n'  
                    && bufp->newline_anchor)  
             {  
               NEXT;  
             }  
           goto fail;  
   
   
         /* Match at the very beginning of the data.  */  
         CASE (begbuf):  
           DEBUG_PRINT1 ("EXECUTING begbuf.\n");  
           if (AT_STRINGS_BEG (d))  
             {  
               NEXT;  
             }  
           goto fail;  
   
   
         /* Match at the very end of the data.  */  
         CASE (endbuf):  
           DEBUG_PRINT1 ("EXECUTING endbuf.\n");  
           if (AT_STRINGS_END (d))  
             {  
               NEXT;  
             }  
           goto fail;  
   
   
         /* on_failure_keep_string_jump is used to optimize `.*\n'.  It  
            pushes NULL as the value for the string on the stack.  Then  
            `pop_failure_point' will keep the current value for the  
            string, instead of restoring it.  To see why, consider  
            matching `foo\nbar' against `.*\n'.  The .* matches the foo;  
            then the . fails against the \n.  But the next thing we want  
            to do is match the \n against the \n; if we restored the  
            string value, we would be back at the foo.  
   
            Because this is used only in specific cases, we don't need to  
            check all the things that `on_failure_jump' does, to make  
            sure the right things get saved on the stack.  Hence we don't  
            share its code.  The only reason to push anything on the  
            stack at all is that otherwise we would have to change  
            `anychar's code to do something besides goto fail in this  
            case; that seems worse than this.  */  
         CASE (on_failure_keep_string_jump):  
           DEBUG_PRINT1 ("EXECUTING on_failure_keep_string_jump");  
   
           EXTRACT_NUMBER_AND_INCR (mcnt, p);  
 #ifdef _LIBC  
           DEBUG_PRINT3 (" %d (to %p):\n", mcnt, p + mcnt);  
 #else  
           DEBUG_PRINT3 (" %d (to 0x%x):\n", mcnt, p + mcnt);  
 #endif  
   
           PUSH_FAILURE_POINT (p + mcnt, NULL, -2);  
           NEXT;  
   
   
         /* Uses of on_failure_jump:  
   
            Each alternative starts with an on_failure_jump that points  
            to the beginning of the next alternative.  Each alternative  
            except the last ends with a jump that in effect jumps past  
            the rest of the alternatives.  (They really jump to the  
            ending jump of the following alternative, because tensioning  
            these jumps is a hassle.)  
   
            Repeats start with an on_failure_jump that points past both  
            the repetition text and either the following jump or  
            pop_failure_jump back to this on_failure_jump.  */  
         CASE (on_failure_jump):  
         on_failure:  
           DEBUG_PRINT1 ("EXECUTING on_failure_jump");  
   
           EXTRACT_NUMBER_AND_INCR (mcnt, p);  
 #ifdef _LIBC  
           DEBUG_PRINT3 (" %d (to %p)", mcnt, p + mcnt);  
 #else  
           DEBUG_PRINT3 (" %d (to 0x%x)", mcnt, p + mcnt);  
 #endif  
   
           /* If this on_failure_jump comes right before a group (i.e.,  
              the original * applied to a group), save the information  
              for that group and all inner ones, so that if we fail back  
              to this point, the group's information will be correct.  
              For example, in \(a*\)*\1, we need the preceding group,  
              and in \(zz\(a*\)b*\)\2, we need the inner group.  */  
   
           /* We can't use `p' to check ahead because we push  
              a failure point to `p + mcnt' after we do this.  */  
           p1 = p;  
   
           /* We need to skip no_op's before we look for the  
              start_memory in case this on_failure_jump is happening as  
              the result of a completed succeed_n, as in \(a\)\{1,3\}b\1  
              against aba.  */  
           while (p1 < pend && (re_opcode_t) *p1 == no_op)  
             p1++;  
   
           if (p1 < pend && (re_opcode_t) *p1 == start_memory)  
             {  
               /* We have a new highest active register now.  This will  
                  get reset at the start_memory we are about to get to,  
                  but we will have saved all the registers relevant to  
                  this repetition op, as described above.  */  
               highest_active_reg = *(p1 + 1) + *(p1 + 2);  
               if (lowest_active_reg == NO_LOWEST_ACTIVE_REG)  
                 lowest_active_reg = *(p1 + 1);  
             }  
   
           DEBUG_PRINT1 (":\n");  
           PUSH_FAILURE_POINT (p + mcnt, d, -2);  
           NEXT;  
   
   
         /* A smart repeat ends with `maybe_pop_jump'.  
            We change it to either `pop_failure_jump' or `jump'.  */  
         CASE (maybe_pop_jump):  
           EXTRACT_NUMBER_AND_INCR (mcnt, p);  
           DEBUG_PRINT2 ("EXECUTING maybe_pop_jump %d.\n", mcnt);  
           {  
             register UCHAR_T *p2 = p;  
   
             /* Compare the beginning of the repeat with what in the  
                pattern follows its end. If we can establish that there  
                is nothing that they would both match, i.e., that we  
                would have to backtrack because of (as in, e.g., `a*a')  
                then we can change to pop_failure_jump, because we'll  
                never have to backtrack.  
   
                This is not true in the case of alternatives: in  
                `(a|ab)*' we do need to backtrack to the `ab' alternative  
                (e.g., if the string was `ab').  But instead of trying to  
                detect that here, the alternative has put on a dummy  
                failure point which is what we will end up popping.  */  
   
             /* Skip over open/close-group commands.  
                If what follows this loop is a ...+ construct,  
                look at what begins its body, since we will have to  
                match at least one of that.  */  
             while (1)  
               {  
                 if (p2 + 2 < pend  
                     && ((re_opcode_t) *p2 == stop_memory  
                         || (re_opcode_t) *p2 == start_memory))  
                   p2 += 3;  
                 else if (p2 + 2 + 2 * OFFSET_ADDRESS_SIZE < pend  
                          && (re_opcode_t) *p2 == dummy_failure_jump)  
                   p2 += 2 + 2 * OFFSET_ADDRESS_SIZE;  
                 else  
                   break;  
               }  
   
             p1 = p + mcnt;  
             /* p1[0] ... p1[2] are the `on_failure_jump' corresponding  
                to the `maybe_finalize_jump' of this case.  Examine what  
                follows.  */  
   
             /* If we're at the end of the pattern, we can change.  */  
             if (p2 == pend)  
               {  
                 /* Consider what happens when matching ":\(.*\)"  
                    against ":/".  I don't really understand this code  
                    yet.  */  
                 p[-(1+OFFSET_ADDRESS_SIZE)] = (UCHAR_T)  
                   pop_failure_jump;  
                 DEBUG_PRINT1  
                   ("  End of pattern: change to `pop_failure_jump'.\n");  
               }  
   
             else if ((re_opcode_t) *p2 == exactn  
 #ifdef MBS_SUPPORT  
                      || (re_opcode_t) *p2 == exactn_bin  
 #endif  
                      || (bufp->newline_anchor && (re_opcode_t) *p2 == endline))  
               {  
                 register UCHAR_T c  
                   = *p2 == (UCHAR_T) endline ? '\n' : p2[2];  
   
                 if (((re_opcode_t) p1[1+OFFSET_ADDRESS_SIZE] == exactn  
 #ifdef MBS_SUPPORT  
                      || (re_opcode_t) p1[1+OFFSET_ADDRESS_SIZE] == exactn_bin  
 #endif  
                     ) && p1[3+OFFSET_ADDRESS_SIZE] != c)  
                   {  
                     p[-(1+OFFSET_ADDRESS_SIZE)] = (UCHAR_T)  
                       pop_failure_jump;  
 #ifdef WCHAR  
                       DEBUG_PRINT3 ("  %C != %C => pop_failure_jump.\n",  
                                     (wint_t) c,  
                                     (wint_t) p1[3+OFFSET_ADDRESS_SIZE]);  
 #else  
                       DEBUG_PRINT3 ("  %c != %c => pop_failure_jump.\n",  
                                     (char) c,  
                                     (char) p1[3+OFFSET_ADDRESS_SIZE]);  
 #endif  
                   }  
   
 #ifndef WCHAR  
                 else if ((re_opcode_t) p1[3] == charset  
                          || (re_opcode_t) p1[3] == charset_not)  
                   {  
                     int negate = (re_opcode_t) p1[3] == charset_not;  
   
                     if (c < (unsigned) (p1[4] * BYTEWIDTH)  
                         && p1[5 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH)))  
                       negate = !negate;  
   
                     /* `negate' is equal to 1 if c would match, which means  
                         that we can't change to pop_failure_jump.  */  
                     if (!negate)  
                       {  
                         p[-3] = (unsigned char) pop_failure_jump;  
                         DEBUG_PRINT1 ("  No match => pop_failure_jump.\n");  
                       }  
                   }  
 #endif /* not WCHAR */  
               }  
 #ifndef WCHAR  
             else if ((re_opcode_t) *p2 == charset)  
               {  
                 /* We win if the first character of the loop is not part  
                    of the charset.  */  
                 if ((re_opcode_t) p1[3] == exactn  
                     && ! ((int) p2[1] * BYTEWIDTH > (int) p1[5]  
                           && (p2[2 + p1[5] / BYTEWIDTH]  
                               & (1 << (p1[5] % BYTEWIDTH)))))  
                   {  
                     p[-3] = (unsigned char) pop_failure_jump;  
                     DEBUG_PRINT1 ("  No match => pop_failure_jump.\n");  
                   }  
   
                 else if ((re_opcode_t) p1[3] == charset_not)  
                   {  
                     int idx;  
                     /* We win if the charset_not inside the loop  
                        lists every character listed in the charset after.  */  
                     for (idx = 0; idx < (int) p2[1]; idx++)  
                       if (! (p2[2 + idx] == 0  
                              || (idx < (int) p1[4]  
                                  && ((p2[2 + idx] & ~ p1[5 + idx]) == 0))))  
                         break;  
   
                     if (idx == p2[1])  
                       {  
                         p[-3] = (unsigned char) pop_failure_jump;  
                         DEBUG_PRINT1 ("  No match => pop_failure_jump.\n");  
                       }  
                   }  
                 else if ((re_opcode_t) p1[3] == charset)  
                   {  
                     int idx;  
                     /* We win if the charset inside the loop  
                        has no overlap with the one after the loop.  */  
                     for (idx = 0;  
                          idx < (int) p2[1] && idx < (int) p1[4];  
                          idx++)  
                       if ((p2[2 + idx] & p1[5 + idx]) != 0)  
                         break;  
   
                     if (idx == p2[1] || idx == p1[4])  
                       {  
                         p[-3] = (unsigned char) pop_failure_jump;  
                         DEBUG_PRINT1 ("  No match => pop_failure_jump.\n");  
                       }  
                   }  
               }  
 #endif /* not WCHAR */  
           }  
           p -= OFFSET_ADDRESS_SIZE;     /* Point at relative address again.  */  
           if ((re_opcode_t) p[-1] != pop_failure_jump)  
             {  
               p[-1] = (UCHAR_T) jump;  
               DEBUG_PRINT1 ("  Match => jump.\n");  
               goto unconditional_jump;  
             }  
         /* Note fall through.  */  
   
   
         /* The end of a simple repeat has a pop_failure_jump back to  
            its matching on_failure_jump, where the latter will push a  
            failure point.  The pop_failure_jump takes off failure  
            points put on by this pop_failure_jump's matching  
            on_failure_jump; we got through the pattern to here from the  
            matching on_failure_jump, so didn't fail.  */  
         CASE (pop_failure_jump):  
           {  
             /* We need to pass separate storage for the lowest and  
                highest registers, even though we don't care about the  
                actual values.  Otherwise, we will restore only one  
                register from the stack, since lowest will == highest in  
                `pop_failure_point'.  */  
             active_reg_t dummy_low_reg, dummy_high_reg;  
             UCHAR_T *pdummy = NULL;  
             const CHAR_T *sdummy = NULL;  
   
             DEBUG_PRINT1 ("EXECUTING pop_failure_jump.\n");  
             POP_FAILURE_POINT (sdummy, pdummy,  
                                dummy_low_reg, dummy_high_reg,  
                                reg_dummy, reg_dummy, reg_info_dummy);  
           }  
           /* Note fall through.  */  
   
         unconditional_jump:  
 #ifdef _LIBC  
           DEBUG_PRINT2 ("\n%p: ", p);  
 #else  
           DEBUG_PRINT2 ("\n0x%x: ", p);  
 #endif  
           /* Note fall through.  */  
   
         /* Unconditionally jump (without popping any failure points).  */  
         CASE (jump):  
           EXTRACT_NUMBER_AND_INCR (mcnt, p);    /* Get the amount to jump.  */  
           DEBUG_PRINT2 ("EXECUTING jump %d ", mcnt);  
           p += mcnt;                            /* Do the jump.  */  
 #ifdef _LIBC  
           DEBUG_PRINT2 ("(to %p).\n", p);  
 #else  
           DEBUG_PRINT2 ("(to 0x%x).\n", p);  
 #endif  
           NEXT;  
   
   
         /* We need this opcode so we can detect where alternatives end  
            in `group_match_null_string_p' et al.  */  
         CASE (jump_past_alt):  
           DEBUG_PRINT1 ("EXECUTING jump_past_alt.\n");  
           goto unconditional_jump;  
   
   
         /* Normally, the on_failure_jump pushes a failure point, which  
            then gets popped at pop_failure_jump.  We will end up at  
            pop_failure_jump, also, and with a pattern of, say, `a+', we  
            are skipping over the on_failure_jump, so we have to push  
            something meaningless for pop_failure_jump to pop.  */  
         CASE (dummy_failure_jump):  
           DEBUG_PRINT1 ("EXECUTING dummy_failure_jump.\n");  
           /* It doesn't matter what we push for the string here.  What  
              the code at `fail' tests is the value for the pattern.  */  
           PUSH_FAILURE_POINT (NULL, NULL, -2);  
           goto unconditional_jump;  
   
   
         /* At the end of an alternative, we need to push a dummy failure  
            point in case we are followed by a `pop_failure_jump', because  
            we don't want the failure point for the alternative to be  
            popped.  For example, matching `(a|ab)*' against `aab'  
            requires that we match the `ab' alternative.  */  
         CASE (push_dummy_failure):  
           DEBUG_PRINT1 ("EXECUTING push_dummy_failure.\n");  
           /* See comments just above at `dummy_failure_jump' about the  
              two zeroes.  */  
           PUSH_FAILURE_POINT (NULL, NULL, -2);  
           NEXT;  
   
         /* Have to succeed matching what follows at least n times.  
            After that, handle like `on_failure_jump'.  */  
         CASE (succeed_n):  
           EXTRACT_NUMBER (mcnt, p + OFFSET_ADDRESS_SIZE);  
           DEBUG_PRINT2 ("EXECUTING succeed_n %d.\n", mcnt);  
   
           assert (mcnt >= 0);  
           /* Originally, this is how many times we HAVE to succeed.  */  
           if (mcnt > 0)  
             {  
                mcnt--;  
                p += OFFSET_ADDRESS_SIZE;  
                STORE_NUMBER_AND_INCR (p, mcnt);  
 #ifdef _LIBC  
                DEBUG_PRINT3 ("  Setting %p to %d.\n", p - OFFSET_ADDRESS_SIZE  
                              , mcnt);  
 #else  
                DEBUG_PRINT3 ("  Setting 0x%x to %d.\n", p - OFFSET_ADDRESS_SIZE  
                              , mcnt);  
 #endif  
             }  
           else if (mcnt == 0)  
             {  
 #ifdef _LIBC  
               DEBUG_PRINT2 ("  Setting two bytes from %p to no_op.\n",  
                             p + OFFSET_ADDRESS_SIZE);  
 #else  
               DEBUG_PRINT2 ("  Setting two bytes from 0x%x to no_op.\n",  
                             p + OFFSET_ADDRESS_SIZE);  
 #endif /* _LIBC */  
   
 #ifdef WCHAR  
               p[1] = (UCHAR_T) no_op;  
 #else  
               p[2] = (UCHAR_T) no_op;  
               p[3] = (UCHAR_T) no_op;  
 #endif /* WCHAR */  
               goto on_failure;  
             }  
           NEXT;  
   
         CASE (jump_n):  
           EXTRACT_NUMBER (mcnt, p + OFFSET_ADDRESS_SIZE);  
           DEBUG_PRINT2 ("EXECUTING jump_n %d.\n", mcnt);  
   
           /* Originally, this is how many times we CAN jump.  */  
           if (mcnt)  
             {  
                mcnt--;  
                STORE_NUMBER (p + OFFSET_ADDRESS_SIZE, mcnt);  
   
 #ifdef _LIBC  
                DEBUG_PRINT3 ("  Setting %p to %d.\n", p + OFFSET_ADDRESS_SIZE,  
                              mcnt);  
 #else  
                DEBUG_PRINT3 ("  Setting 0x%x to %d.\n", p + OFFSET_ADDRESS_SIZE,  
                              mcnt);  
 #endif /* _LIBC */  
                goto unconditional_jump;  
             }  
           /* If don't have to jump any more, skip over the rest of command.  */  
           else  
             p += 2 * OFFSET_ADDRESS_SIZE;  
           NEXT;  
   
         CASE (set_number_at):  
           {  
             DEBUG_PRINT1 ("EXECUTING set_number_at.\n");  
   
             EXTRACT_NUMBER_AND_INCR (mcnt, p);  
             p1 = p + mcnt;  
             EXTRACT_NUMBER_AND_INCR (mcnt, p);  
 #ifdef _LIBC  
             DEBUG_PRINT3 ("  Setting %p to %d.\n", p1, mcnt);  
 #else  
             DEBUG_PRINT3 ("  Setting 0x%x to %d.\n", p1, mcnt);  
 #endif  
             STORE_NUMBER (p1, mcnt);  
             NEXT;  
           }  
   
 #if 0  
         /* The DEC Alpha C compiler 3.x generates incorrect code for the  
            test  WORDCHAR_P (d - 1) != WORDCHAR_P (d)  in the expansion of  
            AT_WORD_BOUNDARY, so this code is disabled.  Expanding the  
            macro and introducing temporary variables works around the bug.  */  
   
         CASE (wordbound):  
           DEBUG_PRINT1 ("EXECUTING wordbound.\n");  
           if (AT_WORD_BOUNDARY (d))  
             {  
               NEXT;  
             }  
           goto fail;  
   
         CASE (notwordbound):  
           DEBUG_PRINT1 ("EXECUTING notwordbound.\n");  
           if (AT_WORD_BOUNDARY (d))  
             goto fail;  
           NEXT;  
 #else  
         CASE (wordbound):  
         {  
           boolean prevchar, thischar;  
   
           DEBUG_PRINT1 ("EXECUTING wordbound.\n");  
           if (AT_STRINGS_BEG (d) || AT_STRINGS_END (d))  
             {  
               NEXT;  
             }  
   
           prevchar = WORDCHAR_P (d - 1);  
           thischar = WORDCHAR_P (d);  
           if (prevchar != thischar)  
             {  
               NEXT;  
             }  
           goto fail;  
         }  
   
       CASE (notwordbound):  
         {  
           boolean prevchar, thischar;  
   
           DEBUG_PRINT1 ("EXECUTING notwordbound.\n");  
           if (AT_STRINGS_BEG (d) || AT_STRINGS_END (d))  
             goto fail;  
   
           prevchar = WORDCHAR_P (d - 1);  
           thischar = WORDCHAR_P (d);  
           if (prevchar != thischar)  
             goto fail;  
           NEXT;  
         }  
 #endif  
   
         CASE (wordbeg):  
           DEBUG_PRINT1 ("EXECUTING wordbeg.\n");  
           if (!AT_STRINGS_END (d) && WORDCHAR_P (d)  
               && (AT_STRINGS_BEG (d) || !WORDCHAR_P (d - 1)))  
             {  
               NEXT;  
             }  
           goto fail;  
   
         CASE (wordend):  
           DEBUG_PRINT1 ("EXECUTING wordend.\n");  
           if (!AT_STRINGS_BEG (d) && WORDCHAR_P (d - 1)  
               && (AT_STRINGS_END (d) || !WORDCHAR_P (d)))  
             {  
               NEXT;  
             }  
           goto fail;  
   
 #ifdef emacs  
         CASE (before_dot):  
           DEBUG_PRINT1 ("EXECUTING before_dot.\n");  
           if (PTR_CHAR_POS ((unsigned char *) d) >= point)  
             goto fail;  
           NEXT;  
   
         CASE (at_dot):  
           DEBUG_PRINT1 ("EXECUTING at_dot.\n");  
           if (PTR_CHAR_POS ((unsigned char *) d) != point)  
             goto fail;  
           NEXT;  
   
         CASE (after_dot):  
           DEBUG_PRINT1 ("EXECUTING after_dot.\n");  
           if (PTR_CHAR_POS ((unsigned char *) d) <= point)  
             goto fail;  
           NEXT;  
   
         CASE (syntaxspec):  
           DEBUG_PRINT2 ("EXECUTING syntaxspec %d.\n", mcnt);  
           mcnt = *p++;  
           goto matchsyntax;  
   
         CASE (wordchar):  
           DEBUG_PRINT1 ("EXECUTING Emacs wordchar.\n");  
           mcnt = (int) Sword;  
         matchsyntax:  
           PREFETCH ();  
           /* Can't use *d++ here; SYNTAX may be an unsafe macro.  */  
           d++;  
           if (SYNTAX (d[-1]) != (enum syntaxcode) mcnt)  
             goto fail;  
           SET_REGS_MATCHED ();  
           NEXT;  
   
         CASE (notsyntaxspec):  
           DEBUG_PRINT2 ("EXECUTING notsyntaxspec %d.\n", mcnt);  
           mcnt = *p++;  
           goto matchnotsyntax;  
   
         CASE (notwordchar):  
           DEBUG_PRINT1 ("EXECUTING Emacs notwordchar.\n");  
           mcnt = (int) Sword;  
         matchnotsyntax:  
           PREFETCH ();  
           /* Can't use *d++ here; SYNTAX may be an unsafe macro.  */  
           d++;  
           if (SYNTAX (d[-1]) == (enum syntaxcode) mcnt)  
             goto fail;  
           SET_REGS_MATCHED ();  
           NEXT;  
   
 #else /* not emacs */  
         CASE (wordchar):  
           DEBUG_PRINT1 ("EXECUTING non-Emacs wordchar.\n");  
           PREFETCH ();  
           if (!WORDCHAR_P (d))  
             goto fail;  
           SET_REGS_MATCHED ();  
           d++;  
           NEXT;  
   
         CASE (notwordchar):  
           DEBUG_PRINT1 ("EXECUTING non-Emacs notwordchar.\n");  
           PREFETCH ();  
           if (WORDCHAR_P (d))  
             goto fail;  
           SET_REGS_MATCHED ();  
           d++;  
           NEXT;  
 #endif /* not emacs */  
   
 #ifndef __GNUC__  
         default:  
           abort ();  
         }  
       continue;  /* Successfully executed one pattern command; keep going.  */  
 #endif  
   
   
     /* We goto here if a matching operation fails. */  
     fail:  
       if (!FAIL_STACK_EMPTY ())  
         { /* A restart point is known.  Restore to that state.  */  
           DEBUG_PRINT1 ("\nFAIL:\n");  
           POP_FAILURE_POINT (d, p,  
                              lowest_active_reg, highest_active_reg,  
                              regstart, regend, reg_info);  
   
           /* If this failure point is a dummy, try the next one.  */  
           if (!p)  
             goto fail;  
   
           /* If we failed to the end of the pattern, don't examine *p.  */  
           assert (p <= pend);  
           if (p < pend)  
             {  
               boolean is_a_jump_n = false;  
   
               /* If failed to a backwards jump that's part of a repetition  
                  loop, need to pop this failure point and use the next one.  */  
               switch ((re_opcode_t) *p)  
                 {  
                 case jump_n:  
                   is_a_jump_n = true;  
                 case maybe_pop_jump:  
                 case pop_failure_jump:  
                 case jump:  
                   p1 = p + 1;  
                   EXTRACT_NUMBER_AND_INCR (mcnt, p1);  
                   p1 += mcnt;  
   
                   if ((is_a_jump_n && (re_opcode_t) *p1 == succeed_n)  
                       || (!is_a_jump_n  
                           && (re_opcode_t) *p1 == on_failure_jump))  
                     goto fail;  
                   break;  
                 default:  
                   /* do nothing */ ;  
                 }  
             }  
   
           if (d >= string1 && d <= end1)  
             dend = end_match_1;  
         }  
       else  
         break;   /* Matching at this starting point really fails.  */  
     } /* for (;;) */  
   
   if (best_regs_set)  
     goto restore_best_regs;  
   
   FREE_VARIABLES ();  
   
   return -1;                            /* Failure to match.  */  
 } /* re_match_2 */  
   
 /* Subroutine definitions for re_match_2.  */  
   
   
 /* We are passed P pointing to a register number after a start_memory.  
   
    Return true if the pattern up to the corresponding stop_memory can  
    match the empty string, and false otherwise.  
   
    If we find the matching stop_memory, sets P to point to one past its number.  
    Otherwise, sets P to an undefined byte less than or equal to END.  
   
    We don't handle duplicates properly (yet).  */  
   
 static boolean  
 PREFIX(group_match_null_string_p) (UCHAR_T **p, UCHAR_T *end,  
                                    PREFIX(register_info_type) *reg_info)  
 {  
   int mcnt;  
   /* Point to after the args to the start_memory.  */  
   UCHAR_T *p1 = *p + 2;  
   
   while (p1 < end)  
     {  
       /* Skip over opcodes that can match nothing, and return true or  
          false, as appropriate, when we get to one that can't, or to the  
          matching stop_memory.  */  
   
       switch ((re_opcode_t) *p1)  
         {  
         /* Could be either a loop or a series of alternatives.  */  
         case on_failure_jump:  
           p1++;  
           EXTRACT_NUMBER_AND_INCR (mcnt, p1);  
   
           /* If the next operation is not a jump backwards in the  
              pattern.  */  
   
           if (mcnt >= 0)  
             {  
               /* Go through the on_failure_jumps of the alternatives,  
                  seeing if any of the alternatives cannot match nothing.  
                  The last alternative starts with only a jump,  
                  whereas the rest start with on_failure_jump and end  
                  with a jump, e.g., here is the pattern for `a|b|c':  
   
                  /on_failure_jump/0/6/exactn/1/a/jump_past_alt/0/6  
                  /on_failure_jump/0/6/exactn/1/b/jump_past_alt/0/3  
                  /exactn/1/c  
   
                  So, we have to first go through the first (n-1)  
                  alternatives and then deal with the last one separately.  */  
   
   
               /* Deal with the first (n-1) alternatives, which start  
                  with an on_failure_jump (see above) that jumps to right  
                  past a jump_past_alt.  */  
   
               while ((re_opcode_t) p1[mcnt-(1+OFFSET_ADDRESS_SIZE)] ==  
                      jump_past_alt)  
                 {  
                   /* `mcnt' holds how many bytes long the alternative  
                      is, including the ending `jump_past_alt' and  
                      its number.  */  
   
                   if (!PREFIX(alt_match_null_string_p) (p1, p1 + mcnt -  
                                                 (1 + OFFSET_ADDRESS_SIZE),  
                                                 reg_info))  
                     return false;  
   
                   /* Move to right after this alternative, including the  
                      jump_past_alt.  */  
                   p1 += mcnt;  
   
                   /* Break if it's the beginning of an n-th alternative  
                      that doesn't begin with an on_failure_jump.  */  
                   if ((re_opcode_t) *p1 != on_failure_jump)  
                     break;  
   
                   /* Still have to check that it's not an n-th  
                      alternative that starts with an on_failure_jump.  */  
                   p1++;  
                   EXTRACT_NUMBER_AND_INCR (mcnt, p1);  
                   if ((re_opcode_t) p1[mcnt-(1+OFFSET_ADDRESS_SIZE)] !=  
                       jump_past_alt)  
                     {  
                       /* Get to the beginning of the n-th alternative.  */  
                       p1 -= 1 + OFFSET_ADDRESS_SIZE;  
                       break;  
                     }  
                 }  
   
               /* Deal with the last alternative: go back and get number  
                  of the `jump_past_alt' just before it.  `mcnt' contains  
                  the length of the alternative.  */  
               EXTRACT_NUMBER (mcnt, p1 - OFFSET_ADDRESS_SIZE);  
   
               if (!PREFIX(alt_match_null_string_p) (p1, p1 + mcnt, reg_info))  
                 return false;  
   
               p1 += mcnt;       /* Get past the n-th alternative.  */  
             } /* if mcnt > 0 */  
           break;  
   
   
         case stop_memory:  
           assert (p1[1] == **p);  
           *p = p1 + 2;  
           return true;  
   
   
         default:  
           if (!PREFIX(common_op_match_null_string_p) (&p1, end, reg_info))  
             return false;  
         }  
     } /* while p1 < end */  
   
   return false;  
 } /* group_match_null_string_p */  
   
   
 /* Similar to group_match_null_string_p, but doesn't deal with alternatives:  
    It expects P to be the first byte of a single alternative and END one  
    byte past the last. The alternative can contain groups.  */  
   
 static boolean  
 PREFIX(alt_match_null_string_p) (UCHAR_T *p, UCHAR_T *end,  
                                  PREFIX(register_info_type) *reg_info)  
 {  
   int mcnt;  
   UCHAR_T *p1 = p;  
   
   while (p1 < end)  
     {  
       /* Skip over opcodes that can match nothing, and break when we get  
          to one that can't.  */  
   
       switch ((re_opcode_t) *p1)  
         {  
         /* It's a loop.  */  
         case on_failure_jump:  
           p1++;  
           EXTRACT_NUMBER_AND_INCR (mcnt, p1);  
           p1 += mcnt;  
           break;  
   
         default:  
           if (!PREFIX(common_op_match_null_string_p) (&p1, end, reg_info))  
             return false;  
         }  
     }  /* while p1 < end */  
   
   return true;  
 } /* alt_match_null_string_p */  
   
   
 /* Deals with the ops common to group_match_null_string_p and  
    alt_match_null_string_p.  
   
    Sets P to one after the op and its arguments, if any.  */  
   
 static boolean  
 PREFIX(common_op_match_null_string_p) (UCHAR_T **p, UCHAR_T *end,  
                                        PREFIX(register_info_type) *reg_info)  
 {  
   int mcnt;  
   boolean ret;  
   int reg_no;  
   UCHAR_T *p1 = *p;  
   
   switch ((re_opcode_t) *p1++)  
     {  
     case no_op:  
     case begline:  
     case endline:  
     case begbuf:  
     case endbuf:  
     case wordbeg:  
     case wordend:  
     case wordbound:  
     case notwordbound:  
 #ifdef emacs  
     case before_dot:  
     case at_dot:  
     case after_dot:  
 #endif  
       break;  
   
     case start_memory:  
       reg_no = *p1;  
       assert (reg_no > 0 && reg_no <= MAX_REGNUM);  
       ret = PREFIX(group_match_null_string_p) (&p1, end, reg_info);  
   
       /* Have to set this here in case we're checking a group which  
          contains a group and a back reference to it.  */  
   
       if (REG_MATCH_NULL_STRING_P (reg_info[reg_no]) == MATCH_NULL_UNSET_VALUE)  
         REG_MATCH_NULL_STRING_P (reg_info[reg_no]) = ret;  
   
       if (!ret)  
         return false;  
       break;  
   
     /* If this is an optimized succeed_n for zero times, make the jump.  */  
     case jump:  
       EXTRACT_NUMBER_AND_INCR (mcnt, p1);  
       if (mcnt >= 0)  
         p1 += mcnt;  
       else  
         return false;  
       break;  
   
     case succeed_n:  
       /* Get to the number of times to succeed.  */  
       p1 += OFFSET_ADDRESS_SIZE;  
       EXTRACT_NUMBER_AND_INCR (mcnt, p1);  
   
       if (mcnt == 0)  
         {  
           p1 -= 2 * OFFSET_ADDRESS_SIZE;  
           EXTRACT_NUMBER_AND_INCR (mcnt, p1);  
           p1 += mcnt;  
         }  
       else  
         return false;  
       break;  
   
     case duplicate:  
       if (!REG_MATCH_NULL_STRING_P (reg_info[*p1]))  
         return false;  
       break;  
   
     case set_number_at:  
       p1 += 2 * OFFSET_ADDRESS_SIZE;  
   
     default:  
       /* All other opcodes mean we cannot match the empty string.  */  
       return false;  
   }  
   
   *p = p1;  
   return true;  
 } /* common_op_match_null_string_p */  
   
   
 /* Return zero if TRANSLATE[S1] and TRANSLATE[S2] are identical for LEN  
    bytes; nonzero otherwise.  */  
   
 static int  
 PREFIX(bcmp_translate) (const CHAR_T *s1, const CHAR_T *s2,  
                         register int len,  
                         RE_TRANSLATE_TYPE translate)  
 {  
   register const UCHAR_T *p1 = (const UCHAR_T *) s1;  
   register const UCHAR_T *p2 = (const UCHAR_T *) s2;  
   while (len)  
     {  
 #ifdef WCHAR  
       if (((*p1<=0xff)?translate[*p1++]:*p1++)  
           != ((*p2<=0xff)?translate[*p2++]:*p2++))  
         return 1;  
 #else /* BYTE */  
       if (translate[*p1++] != translate[*p2++]) return 1;  
 #endif /* WCHAR */  
       len--;  
     }  
   return 0;  
 }  
   
   
 #else /* not INSIDE_RECURSION */  
   
 /* Entry points for GNU code.  */  
   
 /* re_compile_pattern is the GNU regular expression compiler: it  
    compiles PATTERN (of length SIZE) and puts the result in BUFP.  
    Returns 0 if the pattern was valid, otherwise an error string.  
   
    Assumes the `allocated' (and perhaps `buffer') and `translate' fields  
    are set in BUFP on entry.  
   
    We call regex_compile to do the actual compilation.  */  
   
 const char *  
 re_compile_pattern (const char *pattern,  
                     size_t length,  
                     struct re_pattern_buffer *bufp)  
 {  
   reg_errcode_t ret;  
   
   /* GNU code is written to assume at least RE_NREGS registers will be set  
      (and at least one extra will be -1).  */  
   bufp->regs_allocated = REGS_UNALLOCATED;  
   
   /* And GNU code determines whether or not to get register information  
      by passing null for the REGS argument to re_match, etc., not by  
      setting no_sub.  */  
   bufp->no_sub = 0;  
   
   /* Match anchors at newline.  */  
   bufp->newline_anchor = 1;  
   
 # ifdef MBS_SUPPORT  
   if (MB_CUR_MAX != 1)  
     ret = wcs_regex_compile (pattern, length, re_syntax_options, bufp);  
   else  
 # endif  
     ret = byte_regex_compile (pattern, length, re_syntax_options, bufp);  
   
   if (!ret)  
     return NULL;  
   return gettext (re_error_msgid + re_error_msgid_idx[(int) ret]);  
 }  
 #ifdef _LIBC  
 weak_alias (__re_compile_pattern, re_compile_pattern)  
 #endif  
   
 /* Entry points compatible with 4.2 BSD regex library.  We don't define  
    them unless specifically requested.  */  
   
 #if defined _REGEX_RE_COMP || defined _LIBC  
   
 /* BSD has one and only one pattern buffer.  */  
 static struct re_pattern_buffer re_comp_buf;  
   
 char *  
 #ifdef _LIBC  
 /* Make these definitions weak in libc, so POSIX programs can redefine  
    these names if they don't use our functions, and still use  
    regcomp/regexec below without link errors.  */  
 weak_function  
 #endif  
 re_comp (const char *s)  
 {  
   reg_errcode_t ret;  
   
   if (!s)  
     {  
       if (!re_comp_buf.buffer)  
         return (char *) gettext ("No previous regular expression");  
       return 0;  
     }  
   
   if (!re_comp_buf.buffer)  
     {  
       re_comp_buf.buffer = malloc (200);  
       if (re_comp_buf.buffer == NULL)  
         return (char *) gettext (re_error_msgid  
                                  + re_error_msgid_idx[(int) REG_ESPACE]);  
       re_comp_buf.allocated = 200;  
   
       re_comp_buf.fastmap = malloc (1 << BYTEWIDTH);  
       if (re_comp_buf.fastmap == NULL)  
         return (char *) gettext (re_error_msgid  
                                  + re_error_msgid_idx[(int) REG_ESPACE]);  
     }  
   
   /* Since `re_exec' always passes NULL for the `regs' argument, we  
      don't need to initialize the pattern buffer fields which affect it.  */  
   
   /* Match anchors at newlines.  */  
   re_comp_buf.newline_anchor = 1;  
   
 # ifdef MBS_SUPPORT  
   if (MB_CUR_MAX != 1)  
     ret = wcs_regex_compile (s, strlen (s), re_syntax_options, &re_comp_buf);  
   else  
 # endif  
     ret = byte_regex_compile (s, strlen (s), re_syntax_options, &re_comp_buf);  
   
   if (!ret)  
     return NULL;  
   
   /* Yes, we're discarding `const' here if !HAVE_LIBINTL.  */  
   return (char *) gettext (re_error_msgid + re_error_msgid_idx[(int) ret]);  
 }  
   
   
 int  
 #ifdef _LIBC  
 weak_function  
 #endif  
 re_exec (const char *s)  
 {  
   const int len = strlen (s);  
   return  
     0 <= re_search (&re_comp_buf, s, len, 0, len, 0);  
 }  
   
 #endif /* _REGEX_RE_COMP */  
   
 /* POSIX.2 functions.  Don't define these for Emacs.  */  
   
 #ifndef emacs  
   
 /* regcomp takes a regular expression as a string and compiles it.  
   
    PREG is a regex_t *.  We do not expect any fields to be initialized,  
    since POSIX says we shouldn't.  Thus, we set  
   
      `buffer' to the compiled pattern;  
      `used' to the length of the compiled pattern;  
      `syntax' to RE_SYNTAX_POSIX_EXTENDED if the  
        REG_EXTENDED bit in CFLAGS is set; otherwise, to  
        RE_SYNTAX_POSIX_BASIC;  
      `newline_anchor' to REG_NEWLINE being set in CFLAGS;  
      `fastmap' to an allocated space for the fastmap;  
      `fastmap_accurate' to zero;  
      `re_nsub' to the number of subexpressions in PATTERN.  
   
    PATTERN is the address of the pattern string.  
   
    CFLAGS is a series of bits which affect compilation.  
   
      If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we  
      use POSIX basic syntax.  
   
      If REG_NEWLINE is set, then . and [^...] don't match newline.  
      Also, regexec will try a match beginning after every newline.  
   
      If REG_ICASE is set, then we considers upper- and lowercase  
      versions of letters to be equivalent when matching.  
   
      If REG_NOSUB is set, then when PREG is passed to regexec, that  
      routine will report only success or failure, and nothing about the  
      registers.  
   
    It returns 0 if it succeeds, nonzero if it doesn't.  (See regex.h for  
    the return codes and their meanings.)  */  
   
 int  
 regcomp (regex_t *preg, const char *pattern, int cflags)  
 {  
   reg_errcode_t ret;  
   reg_syntax_t syntax  
     = (cflags & REG_EXTENDED) ?  
       RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC;  
   
   /* regex_compile will allocate the space for the compiled pattern.  */  
   preg->buffer = 0;  
   preg->allocated = 0;  
   preg->used = 0;  
   
   /* Try to allocate space for the fastmap.  */  
   preg->fastmap = (char *) malloc (1 << BYTEWIDTH);  
   
   if (cflags & REG_ICASE)  
     {  
       unsigned i;  
   
       preg->translate =  
         (RE_TRANSLATE_TYPE)  
         malloc (CHAR_SET_SIZE * sizeof (*(RE_TRANSLATE_TYPE)0));  
       if (preg->translate == NULL)  
         return (int) REG_ESPACE;  
   
       /* Map uppercase characters to corresponding lowercase ones.  */  
       for (i = 0; i < CHAR_SET_SIZE; i++)  
         preg->translate[i] = ISUPPER (i) ? TOLOWER (i) : i;  
     }  
   else  
     preg->translate = NULL;  
   
   /* If REG_NEWLINE is set, newlines are treated differently.  */  
   if (cflags & REG_NEWLINE)  
     { /* REG_NEWLINE implies neither . nor [^...] match newline.  */  
       syntax &= ~RE_DOT_NEWLINE;  
       syntax |= RE_HAT_LISTS_NOT_NEWLINE;  
       /* It also changes the matching behavior.  */  
       preg->newline_anchor = 1;  
     }  
   else  
     preg->newline_anchor = 0;  
   
   preg->no_sub = !!(cflags & REG_NOSUB);  
   
   /* POSIX says a null character in the pattern terminates it, so we  
      can use strlen here in compiling the pattern.  */  
 # ifdef MBS_SUPPORT  
   if (MB_CUR_MAX != 1)  
     ret = wcs_regex_compile (pattern, strlen (pattern), syntax, preg);  
   else  
 # endif  
     ret = byte_regex_compile (pattern, strlen (pattern), syntax, preg);  
   
   /* POSIX doesn't distinguish between an unmatched open-group and an  
      unmatched close-group: both are REG_EPAREN.  */  
   if (ret == REG_ERPAREN) ret = REG_EPAREN;  
   
   if (ret == REG_NOERROR && preg->fastmap)  
     {  
       /* Compute the fastmap now, since regexec cannot modify the pattern  
          buffer.  */  
       if (re_compile_fastmap (preg) == -2)  
         {  
           /* Some error occurred while computing the fastmap, just forget  
              about it.  */  
           free (preg->fastmap);  
           preg->fastmap = NULL;  
         }  
     }  
   
   return (int) ret;  
 }  
 #ifdef _LIBC  
 weak_alias (__regcomp, regcomp)  
 #endif  
   
   
 /* regexec searches for a given pattern, specified by PREG, in the  
    string STRING.  
   
    If NMATCH is zero or REG_NOSUB was set in the cflags argument to  
    `regcomp', we ignore PMATCH.  Otherwise, we assume PMATCH has at  
    least NMATCH elements, and we set them to the offsets of the  
    corresponding matched substrings.  
   
    EFLAGS specifies `execution flags' which affect matching: if  
    REG_NOTBOL is set, then ^ does not match at the beginning of the  
    string; if REG_NOTEOL is set, then $ does not match at the end.  
   
    We return 0 if we find a match and REG_NOMATCH if not.  */  
   
 int  
 regexec (const regex_t *preg, const char *string,  
          size_t nmatch, regmatch_t pmatch[], int eflags)  
 {  
   int ret;  
   struct re_registers regs;  
   regex_t private_preg;  
   int len = strlen (string);  
   boolean want_reg_info = !preg->no_sub && nmatch > 0;  
   
   private_preg = *preg;  
   
   private_preg.not_bol = !!(eflags & REG_NOTBOL);  
   private_preg.not_eol = !!(eflags & REG_NOTEOL);  
   
   /* The user has told us exactly how many registers to return  
      information about, via `nmatch'.  We have to pass that on to the  
      matching routines.  */  
   private_preg.regs_allocated = REGS_FIXED;  
   
   if (want_reg_info)  
     {  
       regs.num_regs = nmatch;  
       regs.start = TALLOC (nmatch * 2, regoff_t);  
       if (regs.start == NULL)  
         return (int) REG_NOMATCH;  
       regs.end = regs.start + nmatch;  
     }  
   
   /* Perform the searching operation.  */  
   ret = re_search (&private_preg, string, len,  
                    /* start: */ 0, /* range: */ len,  
                    want_reg_info ? &regs : 0);  
   
   /* Copy the register information to the POSIX structure.  */  
   if (want_reg_info)  
     {  
       if (ret >= 0)  
         {  
           unsigned r;  
   
           for (r = 0; r < nmatch; r++)  
             {  
               pmatch[r].rm_so = regs.start[r];  
               pmatch[r].rm_eo = regs.end[r];  
             }  
         }  
   
       /* If we needed the temporary register info, free the space now.  */  
       free (regs.start);  
     }  
   
   /* We want zero return to mean success, unlike `re_search'.  */  
   return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH;  
 }  
 #ifdef _LIBC  
 weak_alias (__regexec, regexec)  
 #endif  
   
   
 /* Returns a message corresponding to an error code, ERRCODE, returned  
    from either regcomp or regexec.   We don't use PREG here.  */  
   
 size_t  
 regerror (int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)  
 {  
   const char *msg;  
   size_t msg_size;  
   
   if (errcode < 0  
       || errcode >= (int) (sizeof (re_error_msgid_idx)  
                            / sizeof (re_error_msgid_idx[0])))  
     /* Only error codes returned by the rest of the code should be passed  
        to this routine.  If we are given anything else, or if other regex  
        code generates an invalid error code, then the program has a bug.  
        Dump core so we can fix it.  */  
     abort ();  
   
   msg = gettext (re_error_msgid + re_error_msgid_idx[errcode]);  
   
   msg_size = strlen (msg) + 1; /* Includes the null.  */  
   
   if (errbuf_size != 0)  
     {  
       if (msg_size > errbuf_size)  
         {  
 #if defined HAVE_MEMPCPY || defined _LIBC  
           *((char *) __mempcpy (errbuf, msg, errbuf_size - 1)) = '\0';  
 #else  
           memcpy (errbuf, msg, errbuf_size - 1);  
           errbuf[errbuf_size - 1] = 0;  
 #endif  
         }  
       else  
         memcpy (errbuf, msg, msg_size);  
     }  
   
   return msg_size;  
 }  
 #ifdef _LIBC  
 weak_alias (__regerror, regerror)  
 #endif  
   
   
 /* Free dynamically allocated space used by PREG.  */  
   
 void  
 regfree (regex_t *preg)  
 {  
   if (preg->buffer != NULL)  
     free (preg->buffer);  
   preg->buffer = NULL;  
   
   preg->allocated = 0;  
   preg->used = 0;  
   
   if (preg->fastmap != NULL)  
     free (preg->fastmap);  
   preg->fastmap = NULL;  
   preg->fastmap_accurate = 0;  
   
   if (preg->translate != NULL)  
     free (preg->translate);  
   preg->translate = NULL;  
 }  
 #ifdef _LIBC  
 weak_alias (__regfree, regfree)  
 #endif  
   
 #endif /* not emacs  */  
   
 #endif /* not INSIDE_RECURSION */  
   
   
 #undef STORE_NUMBER  
 #undef STORE_NUMBER_AND_INCR  
 #undef EXTRACT_NUMBER  
 #undef EXTRACT_NUMBER_AND_INCR  
   
 #undef DEBUG_PRINT_COMPILED_PATTERN  
 #undef DEBUG_PRINT_DOUBLE_STRING  
   
 #undef INIT_FAIL_STACK  
 #undef RESET_FAIL_STACK  
 #undef DOUBLE_FAIL_STACK  
 #undef PUSH_PATTERN_OP  
 #undef PUSH_FAILURE_POINTER  
 #undef PUSH_FAILURE_INT  
 #undef PUSH_FAILURE_ELT  
 #undef POP_FAILURE_POINTER  
 #undef POP_FAILURE_INT  
 #undef POP_FAILURE_ELT  
 #undef DEBUG_PUSH  
 #undef DEBUG_POP  
 #undef PUSH_FAILURE_POINT  
 #undef POP_FAILURE_POINT  
   
 #undef REG_UNSET_VALUE  
 #undef REG_UNSET  
   
 #undef PATFETCH  
 #undef PATFETCH_RAW  
 #undef PATUNFETCH  
 #undef TRANSLATE  
   
 #undef INIT_BUF_SIZE  
 #undef GET_BUFFER_SPACE  
 #undef BUF_PUSH  
 #undef BUF_PUSH_2  
 #undef BUF_PUSH_3  
 #undef STORE_JUMP  
 #undef STORE_JUMP2  
 #undef INSERT_JUMP  
 #undef INSERT_JUMP2  
 #undef EXTEND_BUFFER  
 #undef GET_UNSIGNED_NUMBER  
 #undef FREE_STACK_RETURN  
   
 # undef POINTER_TO_OFFSET  
 # undef MATCHING_IN_FRST_STRING  
 # undef PREFETCH  
 # undef AT_STRINGS_BEG  
 # undef AT_STRINGS_END  
 # undef WORDCHAR_P  
 # undef FREE_VAR  
 # undef FREE_VARIABLES  
 # undef NO_HIGHEST_ACTIVE_REG  
 # undef NO_LOWEST_ACTIVE_REG  
   
 # undef CHAR_T  
 # undef UCHAR_T  
 # undef COMPILED_BUFFER_VAR  
 # undef OFFSET_ADDRESS_SIZE  
 # undef CHAR_CLASS_SIZE  
 # undef PREFIX  
 # undef ARG_PREFIX  
 # undef PUT_CHAR  
 # undef BYTE  
 # undef WCHAR  
   
 # define DEFINED_ONCE  

Legend:
Removed from v.1.19  
changed lines
  Added in v.1.20

savannah-hackers-public@gnu.org
ViewVC Help
Powered by ViewVC 1.1.26