89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/*
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FUNCTION
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<<wmemcmp>>---compare wide-characters in memory
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ANSI_SYNOPSIS
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#include <wchar.h>
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int wmemcmp(const wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>);
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TRAD_SYNOPSIS
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int wmemcmp(<[s1]>, <[s2]>, <[n]>
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const wchar_t *<[s1]>;
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const wchar_t *<[s2]>;
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size_t <[n]>;
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DESCRIPTION
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The <<wmemcmp>> function compares the first <[n]> wide-characters of the
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object pointed to by <[s1]> to the first <[n]> wide-characters of the
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object pointed to by <[s2]>. This function is not affected by locale
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and all wchar_t values are treated identically. The null wide-character
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and wchar_t values not corresponding to valid characters are not treated
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specially.
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If <[n]> is zero, <[s1]> and <[s2]> must be a valid pointers and the
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function behaves as if the two objects compare equal.
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RETURNS
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The <<wmemcmp>> function returns an integer greater than, equal to,
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or less than zero, accordingly as the object pointed to by <[s1]> is
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greater than, equal to, or less than the object pointed to by <[s2]>.
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PORTABILITY
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<<wmemcmp>> is ISO/IEC 9899/AMD1:1995 (ISO C).
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No supporting OS subroutines are required.
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*/
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/* $NetBSD: wmemcmp.c,v 1.1 2000/12/23 23:14:37 itojun Exp $ */
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/*-
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* Copyright (c)1999 Citrus Project,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* citrus Id: wmemcmp.c,v 1.2 2000/12/20 14:08:31 itojun Exp
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*/
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#include <_ansi.h>
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#include <wchar.h>
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int
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_DEFUN (wmemcmp, (s1, s2, n),
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_CONST wchar_t * s1 _AND
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_CONST wchar_t * s2 _AND
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size_t n)
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{
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size_t i;
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for (i = 0; i < n; i++)
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{
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if (*s1 != *s2)
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{
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/* wchar might be unsigned */
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return *s1 > *s2 ? 1 : -1;
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}
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s1++;
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s2++;
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}
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return 0;
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}
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