xref: /openbsd-src/lib/libc/string/wcslcpy.c (revision a28daedfc357b214be5c701aa8ba8adb29a7f1c2)
1 /*	$OpenBSD: wcslcpy.c,v 1.4 2006/05/05 15:27:38 millert Exp $	*/
2 /*	$NetBSD: wcslcpy.c,v 1.2 2001/01/03 14:33:02 lukem Exp $	*/
3 /*	from OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp 	*/
4 
5 /*
6  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. The name of the author may not be used to endorse or promote products
18  *    derived from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
21  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
22  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
23  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/types.h>
33 #include <wchar.h>
34 
35 /*
36  * Copy src to string dst of size siz.  At most siz-1 characters
37  * will be copied.  Always NUL terminates (unless siz == 0).
38  * Returns wcslen(src); if retval >= siz, truncation occurred.
39  */
40 size_t
41 wcslcpy(wchar_t *dst, const wchar_t *src, size_t siz)
42 {
43 	wchar_t *d = dst;
44 	const wchar_t *s = src;
45 	size_t n = siz;
46 
47 	/* Copy as many bytes as will fit */
48 	if (n != 0) {
49 		while (--n != 0) {
50 			if ((*d++ = *s++) == '\0')
51 				break;
52 		}
53 	}
54 
55 	/* Not enough room in dst, add NUL and traverse rest of src */
56 	if (n == 0) {
57 		if (siz != 0)
58 			*d = '\0';		/* NUL-terminate dst */
59 		while (*s++)
60 			;
61 	}
62 
63 	return(s - src - 1);	/* count does not include NUL */
64 }
65