1/* $Id: strlcpy.c,v 1.1.1.2 2011/08/17 18:40:06 jmmv Exp $ */
2/*	$OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#include <sys/types.h>
21#include <string.h>
22
23#include "tmux.h"
24
25/*
26 * Copy src to string dst of size siz.  At most siz-1 characters
27 * will be copied.  Always NUL terminates (unless siz == 0).
28 * Returns strlen(src); if retval >= siz, truncation occurred.
29 */
30size_t
31strlcpy(char *dst, const char *src, size_t siz)
32{
33	char *d = dst;
34	const char *s = src;
35	size_t n = siz;
36
37	/* Copy as many bytes as will fit */
38	if (n != 0 && --n != 0) {
39		do {
40			if ((*d++ = *s++) == 0)
41				break;
42		} while (--n != 0);
43	}
44
45	/* Not enough room in dst, add NUL and traverse rest of src */
46	if (n == 0) {
47		if (siz != 0)
48			*d = '\0';		/* NUL-terminate dst */
49		while (*s++)
50			;
51	}
52
53	return(s - src - 1);	/* count does not include NUL */
54}
55