/[inetutils]/inetutils/lib/strncasecmp.c
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Diff of /inetutils/lib/strncasecmp.c

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revision 1.1 by ams, Fri Jan 21 13:02:48 2005 UTC revision 1.2 by ams, Fri Dec 2 14:00:00 2005 UTC
# Line 1  Line 1 
1  #define LENGTH_LIMIT  /* strncasecmp.c -- case insensitive string comparator
2  #include "strcasecmp.c"     Copyright (C) 1998, 1999, 2005 Free Software Foundation, Inc.
3    
4       This program is free software; you can redistribute it and/or modify
5       it under the terms of the GNU General Public License as published by
6       the Free Software Foundation; either version 2, or (at your option)
7       any later version.
8    
9       This program is distributed in the hope that it will be useful,
10       but WITHOUT ANY WARRANTY; without even the implied warranty of
11       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12       GNU General Public License for more details.
13    
14       You should have received a copy of the GNU General Public License
15       along with this program; if not, write to the Free Software Foundation,
16       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
17    
18    #ifdef HAVE_CONFIG_H
19    # include <config.h>
20    #endif
21    
22    /* Specification.  */
23    #include "strcase.h"
24    
25    #include <ctype.h>
26    #include <limits.h>
27    
28    #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
29    
30    /* Compare no more than N bytes of strings S1 and S2,
31       ignoring case, returning less than, equal to or
32       greater than zero if S1 is lexicographically less
33       than, equal to or greater than S2.  */
34    
35    int
36    strncasecmp (const char *s1, const char *s2, size_t n)
37    {
38      register const unsigned char *p1 = (const unsigned char *) s1;
39      register const unsigned char *p2 = (const unsigned char *) s2;
40      unsigned char c1, c2;
41    
42      if (p1 == p2 || n == 0)
43        return 0;
44    
45      do
46        {
47          c1 = TOLOWER (*p1);
48          c2 = TOLOWER (*p2);
49    
50          if (--n == 0 || c1 == '\0')
51            break;
52    
53          ++p1;
54          ++p2;
55        }
56      while (c1 == c2);
57    
58      if (UCHAR_MAX <= INT_MAX)
59        return c1 - c2;
60      else
61        /* On machines where 'char' and 'int' are types of the same size, the
62           difference of two 'unsigned char' values - including the sign bit -
63           doesn't fit in an 'int'.  */
64        return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
65    }

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