1/*	$NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 christos Exp $	*/
2/*	$OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $	*/
3
4/*
5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
12 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
14 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
16 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
17 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23#ifndef HAVE_STRLCPY
24
25#include <sys/cdefs.h>
26
27#include <sys/types.h>
28#include <string.h>
29
30/*
31 * Copy src to string dst of size siz.  At most siz-1 characters
32 * will be copied.  Always NUL terminates (unless siz == 0).
33 * Returns strlen(src); if retval >= siz, truncation occurred.
34 */
35size_t
36strlcpy(char *dst, const char *src, size_t siz)
37{
38	char *d = dst;
39	const char *s = src;
40	size_t n = siz;
41
42	if (!dst || !src)
43		return 0;
44
45	/* Copy as many bytes as will fit */
46	if (n != 0 && --n != 0) {
47		do {
48			if ((*d++ = *s++) == 0)
49				break;
50		} while (--n != 0);
51	}
52
53	/* Not enough room in dst, add NUL and traverse rest of src */
54	if (n == 0) {
55		if (siz != 0)
56			*d = '\0';		/* NUL-terminate dst */
57		while (*s++)
58			;
59	}
60
61	return(s - src - 1);	/* count does not include NUL */
62}
63#endif
64