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 #if !defined(_KMDB) && !defined(_BOOT) && !defined(_KERNEL)
31
32 #pragma weak _memcmp = memcmp
33
34 #include "lint.h"
35 #endif /* !_KMDB && !_BOOT && !_KERNEL */
36
37 #include <sys/types.h>
38 #if defined(_KERNEL)
39 #include <sys/systm.h>
40 #else
41 #include <string.h>
42 #include <stddef.h>
43 #endif
44
45 /*
46 * Compare n bytes: s1>s2: >0 s1==s2: 0 s1<s2: <0
47 */
48 int
memcmp(const void * s1,const void * s2,size_t n)49 memcmp(const void *s1, const void *s2, size_t n)
50 {
51 if (s1 != s2 && n != 0) {
52 const unsigned char *ps1 = s1;
53 const unsigned char *ps2 = s2;
54
55 do {
56 if (*ps1++ != *ps2++)
57 return (ps1[-1] - ps2[-1]);
58 } while (--n != 0);
59 }
60
61 return (0);
62 }
63