1/*	$OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $	*/
2
3/*
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#ifdef HAVE_CONFIG_H
20#include "config.h"
21#endif
22
23#ifndef HAVE_STRLCPY
24
25#include <sys/types.h>
26#include <string.h>
27#include "strlcpycat.h"
28
29/*
30 * Copy src to string dst of size siz.  At most siz-1 characters
31 * will be copied.  Always NUL terminates (unless siz == 0).
32 * Returns strlen(src); if retval >= siz, truncation occurred.
33 */
34size_t
35strlcpy(char *dst, const char *src, size_t siz)
36{
37	char *d = dst;
38	const char *s = src;
39	size_t n = siz;
40
41	/* Copy as many bytes as will fit */
42	if (n != 0 && --n != 0) {
43		do {
44			if ((*d++ = *s++) == 0)
45				break;
46		} while (--n != 0);
47	}
48
49	/* Not enough room in dst, add NUL and traverse rest of src */
50	if (n == 0) {
51		if (siz != 0)
52			*d = '\0';		/* NUL-terminate dst */
53		while (*s++)
54			;
55	}
56
57	return(s - src - 1);	/* count does not include NUL */
58}
59
60#endif
61