Home | History | Annotate | Download | only in util
      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 (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #if !defined(_KMDB) && !defined(_BOOT) && !defined(_KERNEL)
     33 
     34 #pragma weak _memcmp = memcmp
     35 
     36 #include "lint.h"
     37 #endif /* !_KMDB && !_BOOT && !_KERNEL */
     38 
     39 #include <sys/types.h>
     40 #if defined(_KERNEL)
     41 #include <sys/systm.h>
     42 #else
     43 #include <string.h>
     44 #include <stddef.h>
     45 #endif
     46 
     47 /*
     48  * Compare n bytes:  s1>s2: >0  s1==s2: 0  s1<s2: <0
     49  */
     50 int
     51 memcmp(const void *s1, const void *s2, size_t n)
     52 {
     53 	if (s1 != s2 && n != 0) {
     54 		const unsigned char *ps1 = s1;
     55 		const unsigned char *ps2 = s2;
     56 
     57 		do {
     58 			if (*ps1++ != *ps2++)
     59 				return (ps1[-1] - ps2[-1]);
     60 		} while (--n != 0);
     61 	}
     62 
     63 	return (0);
     64 }
     65