wcslcpy.c revision 330897 
1/*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 *	from OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp
30 */
31
32#include <sys/cdefs.h>
33#if 0
34#if defined(LIBC_SCCS) && !defined(lint)
35__RCSID("$NetBSD: wcslcpy.c,v 1.1 2000/12/23 23:14:36 itojun Exp $");
36#endif /* LIBC_SCCS and not lint */
37#endif
38__FBSDID("$FreeBSD: stable/11/lib/libc/string/wcslcpy.c 330897 2018-03-14 03:19:51Z eadler $");
39
40#include <sys/types.h>
41#include <wchar.h>
42
43/*
44 * Copy src to string dst of size siz.  At most siz-1 characters
45 * will be copied.  Always NUL terminates (unless siz == 0).
46 * Returns wcslen(src); if retval >= siz, truncation occurred.
47 */
48size_t
49wcslcpy(wchar_t *dst, const wchar_t *src, size_t siz)
50{
51	wchar_t *d = dst;
52	const wchar_t *s = src;
53	size_t n = siz;
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