Annotation of sys/lib/libkern/memcmp.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: memcmp.c,v 1.4 2004/08/07 00:38:32 deraadt Exp $ */
2:
3: /*-
4: * Copyright (c) 1990 The Regents of the University of California.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Chris Torek.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. Neither the name of the University nor the names of its contributors
19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: */
34:
35: #if defined(LIBC_SCCS) && !defined(lint)
36: static char *rcsid = "$OpenBSD: memcmp.c,v 1.4 2004/08/07 00:38:32 deraadt Exp $";
37: #endif /* LIBC_SCCS and not lint */
38:
39: #if !defined(_KERNEL) && !defined(_STANDALONE)
40: #include <string.h>
41: #else
42: #include <lib/libkern/libkern.h>
43: #endif
44:
45: /*
46: * Compare memory regions.
47: */
48: int
49: memcmp(const void *s1, const void *s2, size_t n)
50: {
51: if (n != 0) {
52: const unsigned char *p1 = s1, *p2 = s2;
53:
54: do {
55: if (*p1++ != *p2++)
56: return (*--p1 - *--p2);
57: } while (--n != 0);
58: }
59: return (0);
60: }
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