/[cvs]/ccvs/lib/strncasecmp.c
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revision 1.1 by dprice, Wed Oct 6 23:30:31 2004 UTC revision 1.2 by dprice, Sun Sep 4 05:58:56 2005 UTC
# Line 1  Line 1 
1  #define LENGTH_LIMIT  /* strncasecmp.c -- case insensitive string comparator
2  #include "strcasecmp.c"     Copyright (C) 1998, 1999 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    #if HAVE_CONFIG_H
19    # include <config.h>
20    #endif
21    
22    /* Specification.  */
23    #include "strcase.h"
24    
25    #include <ctype.h>
26    
27    #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
28    
29    /* Compare no more than N bytes of strings S1 and S2,
30       ignoring case, returning less than, equal to or
31       greater than zero if S1 is lexicographically less
32       than, equal to or greater than S2.  */
33    
34    int
35    strncasecmp (const char *s1, const char *s2, size_t n)
36    {
37      register const unsigned char *p1 = (const unsigned char *) s1;
38      register const unsigned char *p2 = (const unsigned char *) s2;
39      unsigned char c1, c2;
40    
41      if (p1 == p2 || n == 0)
42        return 0;
43    
44      do
45        {
46          c1 = TOLOWER (*p1);
47          c2 = TOLOWER (*p2);
48    
49          if (--n == 0 || c1 == '\0')
50            break;
51    
52          ++p1;
53          ++p2;
54        }
55      while (c1 == c2);
56    
57      return c1 - c2;
58    }

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