wcsmbs/wcscmp.c

   1 /* Copyright (C) 1995-2016 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <wchar.h>
  20
  21 #ifndef WCSCMP
  22 # define WCSCMP __wcscmp
  23 #endif
  24
  25 /* Compare S1 and S2, returning less than, equal to or
  26    greater than zero if S1 is lexicographically less than,
  27    equal to or greater than S2.  */
  28 int
  29 WCSCMP (const wchar_t *s1, const wchar_t *s2)
  30 {
  31   wchar_t c1, c2;
  32
  33   do
  34     {
  35       c1 = *s1++;
  36       c2 = *s2++;
  37       if (c2 == L'\0')
  38         return c1 - c2;
  39     }
  40   while (c1 == c2);
  41
  42   return c1 < c2 ? -1 : 1;
  43 }
  44 libc_hidden_def (WCSCMP)
  45 weak_alias (WCSCMP, wcscmp)