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/*

FUNCTION

        <<wmemcmp>>---compare wide characters in memory

ANSI_SYNOPSIS

        #include <wchar.h>

        int wmemcmp(const wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>);

TRAD_SYNOPSIS

        int wmemcmp(<[s1]>, <[s2]>, <[n]>

        const wchar_t *<[s1]>;

        const wchar_t *<[s2]>;

        size_t <[n]>;

DESCRIPTION

        The <<wmemcmp>> function compares the first <[n]> wide characters of the

        object pointed to by <[s1]> to the first <[n]> wide characters of the

        object pointed to by <[s2]>. This function is not affected by locale

        and all wchar_t values are treated identically. The null wide character

        and wchar_t values not corresponding to valid characters are not treated

        specially.

        If <[n]> is zero, <[s1]> and <[s2]> must be a valid pointers and the

        function behaves as if the two objects compare equal.

RETURNS

        The <<wmemcmp>> function returns an integer greater than, equal to,

        or less than zero, accordingly as the object pointed to by <[s1]> is

        greater than, equal to, or less than the object pointed to by <[s2]>.

PORTABILITY

<<wmemcmp>> is ISO/IEC 9899/AMD1:1995 (ISO C).

No supporting OS subroutines are required.

*/

/*      $NetBSD: wmemcmp.c,v 1.1 2000/12/23 23:14:37 itojun Exp $       */

/*-

 * Copyright (c)1999 Citrus Project,

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *      citrus Id: wmemcmp.c,v 1.2 2000/12/20 14:08:31 itojun Exp

 */

#include <_ansi.h>

#include <wchar.h>

int

_DEFUN (wmemcmp, (s1, s2, n),

        _CONST wchar_t * s1 _AND

        _CONST wchar_t * s2 _AND

        size_t n)

{

  size_t i;

  for (i = 0; i < n; i++)

    {

      if (*s1 != *s2)

        {

          /* wchar might be unsigned */

          return *s1 > *s2 ? 1 : -1;

        }

      s1++;

      s2++;

    }

  return 0;

}