1/*	$NetBSD: wcslcpy.c,v 1.2 2001/01/03 14:33:02 lukem Exp $	*/
2/*	from OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp 	*/
3
4/*
5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
22 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32#if defined(LIBC_SCCS) && !defined(lint)
33__RCSID("$NetBSD: wcslcpy.c,v 1.2 2001/01/03 14:33:02 lukem Exp $");
34#endif /* LIBC_SCCS and not lint */
35
36#include <sys/types.h>
37#include <assert.h>
38#include <wchar.h>
39
40/*
41 * Copy src to string dst of size siz.  At most siz-1 characters
42 * will be copied.  Always NUL terminates (unless siz == 0).
43 * Returns wcslen(src); if retval >= siz, truncation occurred.
44 */
45size_t
46wcslcpy(wchar_t *dst, const wchar_t *src, size_t siz)
47{
48	wchar_t *d = dst;
49	const wchar_t *s = src;
50	size_t n = siz;
51
52	_DIAGASSERT(dst != NULL);
53	_DIAGASSERT(src != NULL);
54
55	/* Copy as many bytes as will fit */
56	if (n != 0 && --n != 0) {
57		do {
58			if ((*d++ = *s++) == 0)
59				break;
60		} while (--n != 0);
61	}
62
63	/* Not enough room in dst, add NUL and traverse rest of src */
64	if (n == 0) {
65		if (siz != 0)
66			*d = '\0';		/* NUL-terminate dst */
67		while (*s++)
68			;
69	}
70
71	return(s - src - 1);	/* count does not include NUL */
72}
73