wcsmbs/wcscmp.c

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <wchar.h>
  21
  22
  23 /* Compare S1 and S2, returning less than, equal to or
  24    greater than zero if S1 is lexicographically less than,
  25    equal to or greater than S2.  */
  26 int
  27 wcscmp (s1, s2)
  28      const wchar_t *s1;
  29      const wchar_t *s2;
  30 {
  31   wint_t c1, c2;
  32
  33   do
  34     {
  35       c1 = (wint_t) *s1++;
  36       c2 = (wint_t) *s2++;
  37       if (c1 == L'\0')
  38         return c1 - c2;
  39     }
  40   while (c1 == c2);
  41
  42   return c1 - c2;
  43 }