xref: /titanic_44/usr/src/lib/libc/port/i18n/wmemcpy.c (revision a38ddfee9c8c6b6c5a2947ff52fd2338362a4444)
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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include "lint.h"
30 #include <sys/types.h>
31 #include <wchar.h>
32 #include <limits.h>
33 #include <string.h>
34 #include "libc.h"
35 
36 wchar_t *
37 wmemcpy(wchar_t *ws1, const wchar_t *ws2, size_t n)
38 {
39 	wchar_t	*p1, *p2;
40 	size_t	len;
41 	size_t	max = SIZE_MAX / sizeof (wchar_t);
42 
43 	if (n <= max) {
44 		return ((wchar_t *)memcpy((void *)ws1,
45 		    (const void *)ws2, n * sizeof (wchar_t)));
46 	}
47 
48 	p1 = ws1;
49 	p2 = (wchar_t *)ws2;
50 	do {
51 		if (n > max) {
52 			len = max;
53 		} else {
54 			len = n;
55 		}
56 		(void) memcpy((void *)p1,
57 		    (const void *)p2, len * sizeof (wchar_t));
58 		n = n - len;
59 		p1 += len;
60 		p2 += len;
61 	} while (n != 0);
62 	return (ws1);
63 }
64