xref: /illumos-gate/usr/src/common/util/memcpy.c (revision 7c478bd95313f5f23a4c958a745db2134aa0324)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
28*7c478bd9Sstevel@tonic-gate 
29*7c478bd9Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
30*7c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
31*7c478bd9Sstevel@tonic-gate 
32*7c478bd9Sstevel@tonic-gate 
33*7c478bd9Sstevel@tonic-gate #if !defined(_KMDB) && !defined(_BOOT) && !defined(_KERNEL)
34*7c478bd9Sstevel@tonic-gate 
35*7c478bd9Sstevel@tonic-gate #pragma weak _private_memcpy = _memcpy
36*7c478bd9Sstevel@tonic-gate #pragma weak memcpy = _memcpy
37*7c478bd9Sstevel@tonic-gate 
38*7c478bd9Sstevel@tonic-gate #include "synonyms.h"
39*7c478bd9Sstevel@tonic-gate #endif /* !_KMDB && !_BOOT && !_KERNEL */
40*7c478bd9Sstevel@tonic-gate 
41*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
42*7c478bd9Sstevel@tonic-gate 
43*7c478bd9Sstevel@tonic-gate #if defined(_KERNEL)
44*7c478bd9Sstevel@tonic-gate #include <sys/systm.h>
45*7c478bd9Sstevel@tonic-gate #else
46*7c478bd9Sstevel@tonic-gate #include <stddef.h>
47*7c478bd9Sstevel@tonic-gate #include <string.h>
48*7c478bd9Sstevel@tonic-gate #endif	/* !_KERNEL */
49*7c478bd9Sstevel@tonic-gate 
50*7c478bd9Sstevel@tonic-gate /*
51*7c478bd9Sstevel@tonic-gate  * Copy s0 to s, always copy n bytes.
52*7c478bd9Sstevel@tonic-gate  * Return s
53*7c478bd9Sstevel@tonic-gate  */
54*7c478bd9Sstevel@tonic-gate void *
55*7c478bd9Sstevel@tonic-gate memcpy(void *s, const void *s0, size_t n)
56*7c478bd9Sstevel@tonic-gate {
57*7c478bd9Sstevel@tonic-gate 	if (n != 0) {
58*7c478bd9Sstevel@tonic-gate 		char *s1 = s;
59*7c478bd9Sstevel@tonic-gate 		const char *s2 = s0;
60*7c478bd9Sstevel@tonic-gate 
61*7c478bd9Sstevel@tonic-gate 		do {
62*7c478bd9Sstevel@tonic-gate 			*s1++ = *s2++;
63*7c478bd9Sstevel@tonic-gate 		} while (--n != 0);
64*7c478bd9Sstevel@tonic-gate 	}
65*7c478bd9Sstevel@tonic-gate 	return (s);
66*7c478bd9Sstevel@tonic-gate }
67