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 */
50int
51memcmp(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