xref: /titanic_52/usr/src/common/util/memcpy.c (revision bb25c06cca41ca78e5fb87fbb8e81d55beb18c95)
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  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #pragma ident	"%Z%%M%	%I%	%E% SMI"
27 
28 /*	Copyright (c) 1988 AT&T	*/
29 /*	  All Rights Reserved  	*/
30 
31 /*
32  * The SunStudio compiler may generate calls to _memcpy and so we
33  * need to make sure that the correct symbol exists for these calls,
34  * whether it be libc (first case below) or the kernel (second case).
35  */
36 
37 #if !defined(_KMDB) && !defined(_BOOT) && !defined(_KERNEL)
38 
39 #pragma weak _private_memcpy = _memcpy
40 #pragma weak memcpy = _memcpy
41 
42 #include "synonyms.h"
43 
44 #else
45 
46 #pragma weak _memcpy = memcpy
47 
48 #endif /* !_KMDB && !_BOOT && !_KERNEL */
49 
50 #include <sys/types.h>
51 
52 #if defined(_KERNEL)
53 #include <sys/systm.h>
54 #else
55 #include <stddef.h>
56 #include <string.h>
57 #endif	/* !_KERNEL */
58 
59 /*
60  * Copy s0 to s, always copy n bytes.
61  * Return s
62  */
63 void *
64 memcpy(void *s, const void *s0, size_t n)
65 {
66 	if (n != 0) {
67 		char *s1 = s;
68 		const char *s2 = s0;
69 
70 		do {
71 			*s1++ = *s2++;
72 		} while (--n != 0);
73 	}
74 	return (s);
75 }
76