wcsmbs/wcscasecmp.c

   1 /* Copyright (C) 1991, 1992, 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 #include <wctype.h>
  24 #include <wchar.h>
  25
  26 #ifndef weak_alias
  27 # define __wcscasecmp wcscasecmp
  28 #endif
  29
  30 /* Compare S1 and S2, ignoring case, returning less than, equal to or
  31    greater than zero if S1 is lexicographically less than,
  32    equal to or greater than S2.  */
  33 int
  34 __wcscasecmp (s1, s2)
  35      const wchar_t *s1;
  36      const wchar_t *s2;
  37 {
  38   wint_t c1, c2;
  39
  40   if (s1 == s2)
  41     return 0;
  42
  43   do
  44     {
  45       c1 = towlower (*s1++);
  46       c2 = towlower (*s2++);
  47       if (c1 == '\0')
  48         break;
  49     }
  50   while (c1 == c2);
  51
  52   return c1 - c2;
  53 }
  54 #ifdef weak_alias
  55 weak_alias (__wcscasecmp, wcscasecmp)
  56 #endif