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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 /*	Copyright (c) 1988 AT&T	*/
     30 /*	  All Rights Reserved  	*/
     31 
     32 
     33 #include <sys/types.h>
     34 #if defined(_KERNEL)
     35 #include <sys/systm.h>
     36 #else
     37 #include <string.h>
     38 #include <stddef.h>
     39 #endif
     40 
     41 /*
     42  * Return the ptr in sptr at which the character c1 appears;
     43  * or NULL if not found in n chars; don't stop at \0.
     44  */
     45 void *
     46 memchr(const void *sptr, int c1, size_t n)
     47 {
     48 	if (n != 0) {
     49 		unsigned char c = (unsigned char)c1;
     50 		const unsigned char *sp = sptr;
     51 
     52 		do {
     53 			if (*sp++ == c)
     54 				return ((void *)--sp);
     55 		} while (--n != 0);
     56 	}
     57 	return (NULL);
     58 }
     59