memchr.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#include <sys/types.h>
#if defined(_KERNEL)
#include <sys/systm.h>
#else
#include <string.h>
#include <stddef.h>
#endif
/*
* Return the ptr in sptr at which the character c1 appears;
* or NULL if not found in n chars; don't stop at \0.
*/
void *
memchr(const void *sptr, int c1, size_t n)
{
if (n != 0) {
unsigned char c = (unsigned char)c1;
const unsigned char *sp = sptr;
do {
if (*sp++ == c)
return ((void *)--sp);
} while (--n != 0);
}
return (NULL);
}