xref: /freebsd/lib/libc/string/wcslcpy.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*
2  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. The name of the author may not be used to endorse or promote products
14  *    derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
19  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  *	from OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp
28  */
29 
30 #include <sys/cdefs.h>
31 #if 0
32 #if defined(LIBC_SCCS) && !defined(lint)
33 __RCSID("$NetBSD: wcslcpy.c,v 1.1 2000/12/23 23:14:36 itojun Exp $");
34 #endif /* LIBC_SCCS and not lint */
35 #endif
36 __FBSDID("$FreeBSD$");
37 
38 #include <sys/types.h>
39 #include <wchar.h>
40 
41 /*
42  * Copy src to string dst of size siz.  At most siz-1 characters
43  * will be copied.  Always NUL terminates (unless siz == 0).
44  * Returns wcslen(src); if retval >= siz, truncation occurred.
45  */
46 size_t
47 wcslcpy(dst, src, siz)
48 	wchar_t *dst;
49 	const wchar_t *src;
50 	size_t siz;
51 {
52 	wchar_t *d = dst;
53 	const wchar_t *s = src;
54 	size_t n = siz;
55 
56 	/* Copy as many bytes as will fit */
57 	if (n != 0 && --n != 0) {
58 		do {
59 			if ((*d++ = *s++) == 0)
60 				break;
61 		} while (--n != 0);
62 	}
63 
64 	/* Not enough room in dst, add NUL and traverse rest of src */
65 	if (n == 0) {
66 		if (siz != 0)
67 			*d = '\0';		/* NUL-terminate dst */
68 		while (*s++)
69 			;
70 	}
71 
72 	return(s - src - 1);	/* count does not include NUL */
73 }
74