xref: /titanic_41/usr/src/lib/libc/port/i18n/wmemmove.c (revision 3ee0e49223f178da635734759b9167f924321ff0)
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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 
23 /*
24  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25  * Use is subject to license terms.
26  */
27 
28 #pragma ident	"%Z%%M%	%I%	%E% SMI"
29 
30 #include "synonyms.h"
31 #include <sys/types.h>
32 #include <wchar.h>
33 #include <limits.h>
34 #include <string.h>
35 #include "libc.h"
36 
37 wchar_t *
38 wmemmove(wchar_t *ws1, const wchar_t *ws2, size_t n)
39 {
40 	wchar_t	*ows1;
41 	size_t	max = SIZE_MAX / sizeof (wchar_t);
42 
43 	if (n <= max) {
44 		return ((wchar_t *)memmove((void *)ws1,
45 			(const void *)ws2, n * sizeof (wchar_t)));
46 	}
47 
48 	ows1 = ws1;
49 	if (n != 0) {
50 		if (ws1 <= ws2) {
51 			do {
52 				*ws1++ = *ws2++;
53 			} while (--n != 0);
54 		} else {
55 			ws2 += n;
56 			ws1 += n;
57 			do {
58 				*--ws1 = *--ws2;
59 			} while (--n != 0);
60 		}
61 	}
62 	return (ows1);
63 }
64