glibc/wcsmbs/wcscasecmp.c

/* Copyright (C) 1991-2024 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <wctype.h>
#include <wchar.h>

#ifndef weak_alias
# define __wcscasecmp wcscasecmp
# define TOLOWER(Ch) towlower (Ch)
#else
# ifdef USE_IN_EXTENDED_LOCALE_MODEL
#  define __wcscasecmp __wcscasecmp_l
#  define TOLOWER(Ch) __towlower_l ((Ch), loc)
# else
#  define TOLOWER(Ch) towlower (Ch)
# endif
#endif

#ifdef USE_IN_EXTENDED_LOCALE_MODEL
# define LOCALE_PARAM , locale_t loc
#else
# define LOCALE_PARAM
#endif

/* Compare S1 and S2, ignoring case, returning less than, equal to or
   greater than zero if S1 is lexicographically less than,
   equal to or greater than S2.  */
int
__wcscasecmp (const wchar_t *s1, const wchar_t *s2 LOCALE_PARAM)
{
  wint_t c1, c2;

  if (s1 == s2)
    return 0;

  do
    {
      c1 = TOLOWER (*s1++);
      c2 = TOLOWER (*s2++);
      if (c1 == L'\0')
	break;
    }
  while (c1 == c2);

  return c1 - c2;
}
#ifndef __wcscasecmp
weak_alias (__wcscasecmp, wcscasecmp)
#endif