wmemchr.c

用于嵌入式Linux系统的标准C的库函数

/*
FUNCTION
	<<wmemchr>>---find a wide-character in memory
 

ANSI_SYNOPSIS
	#include <wchar.h>
	wchar_t	*wmemchr(const wchar_t *<[s]>, wchar_t <[c]>, size_t <[n]>);

TRAD_SYNOPSIS
	wchar_t	*wmemchr(<[s]>, <[c]>, <[n]>
	const wchar_t *<[s]>;
	wchar_t <[c]>;
	size_t <[n]>;

DESCRIPTION
	The <<wmemchr>> function locates the first occurrence of <[c]> in the
	initial <[n]> wide-characters of the object pointed to be <[s]>. 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, <[s]> must be a valid pointer and the function
	behaves as if no valid occurrence of <[c]> is found. 

RETURNS
	The <<wmemchr>> function returns a pointer to the located
	wide-character, or a null pointer if the wide-character does not occur
	in the object. 

PORTABILITY
<<wmemchr>> is ISO/IEC 9899/AMD1:1995 (ISO C).
No supporting OS subroutines are required.
*/

/*	$NetBSD: wmemchr.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: wmemchr.c,v 1.2 2000/12/20 14:08:31 itojun Exp
 */


#include <_ansi.h>
#include <wchar.h>

wchar_t *
_DEFUN (wmemchr, (s, c, n),
	_CONST wchar_t * s _AND
	wchar_t c _AND
	size_t n)
{
  size_t i;

  for (i = 0; i < n; i++)
    {
      if (*s == c)
	{
	  /* LINTED const castaway */
	  return (wchar_t *) s;
	}
      s++;
    }
  return NULL;
}