1/*	$NetBSD: strlcpy.c,v 1.5 1999/09/20 04:39:47 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#ifdef HAVE_CONFIG_H
32#include <config.h>
33#endif
34
35#include <tcpdump-stdinc.h>
36
37#include <string.h>
38
39#include "interface.h"
40
41/*
42 * Copy src to string dst of size siz.  At most siz-1 characters
43 * will be copied.  Always NUL terminates (unless siz == 0).
44 * Returns strlen(src); if retval >= siz, truncation occurred.
45 */
46size_t
47strlcpy(char *dst, const char *src, size_t siz)
48{
49	register char *d = dst;
50	register const char *s = src;
51	register size_t n = siz;
52
53	/* Copy as many bytes as will fit */
54	if (n != 0 && --n != 0) {
55		do {
56			if ((*d++ = *s++) == 0)
57				break;
58		} while (--n != 0);
59	}
60
61	/* Not enough room in dst, add NUL and traverse rest of src */
62	if (n == 0) {
63		if (siz != 0)
64			*d = '\0';		/* NUL-terminate dst */
65		while (*s++)
66			;
67	}
68
69	return(s - src - 1);	/* count does not include NUL */
70}
71