lib/sh/strcasecmp.c

   1 /* strcasecmp.c - functions for case-insensitive string comparison. */
   2
   3 /* Copyright (C) 1995 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software; you can redistribute it and/or modify it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2, or (at your option) any later
  10    version.
  11
  12    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15    for more details.
  16
  17    You should have received a copy of the GNU General Public License along
  18    with Bash; see the file COPYING.  If not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA */
  20
  21 #include <config.h>
  22
  23 #if !defined (HAVE_STRCASECMP)
  24
  25 #include <stdc.h>
  26 #include <bashansi.h>
  27 #include <chartypes.h>
  28
  29 /* Compare at most COUNT characters from string1 to string2.  Case
  30    doesn't matter. */
  31 int
  32 strncasecmp (string1, string2, count)
  33      const char *string1;
  34      const char *string2;
  35      int count;
  36 {
  37   register const char *s1;
  38   register const char *s2;
  39   register int r;
  40
  41   if (count <= 0 || (string1 == string2))
  42     return 0;
  43
  44   s1 = string1;
  45   s2 = string2;
  46   do
  47     {
  48       if ((r = TOLOWER ((unsigned char) *s1) - TOLOWER ((unsigned char) *s2)) != 0)
  49         return r;
  50       if (*s1++ == '\0')
  51         break;
  52       s2++;
  53     }
  54   while (--count != 0);
  55
  56   return (0);
  57 }
  58
  59 /* strcmp (), but caseless. */
  60 int
  61 strcasecmp (string1, string2)
  62      const char *string1;
  63      const char *string2;
  64 {
  65   register const char *s1;
  66   register const char *s2;
  67   register int r;
  68
  69   s1 = string1;
  70   s2 = string2;
  71
  72   if (s1 == s2)
  73     return (0);
  74
  75   while ((r = TOLOWER ((unsigned char)*s1) - TOLOWER ((unsigned char)*s2)) == 0)
  76     {
  77       if (*s1++ == '\0')
  78         return 0;
  79       s2++;
  80     }
  81
  82   return (r);
  83 }
  84 #endif /* !HAVE_STRCASECMP */