11556Srgrimes/*	$NetBSD: strlcpy.c,v 1.2 2006/03/30 20:37:51 christos Exp $	*/
250471Speter/*	$OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $	*/
31556Srgrimes
41556Srgrimes/*
51556Srgrimes * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
61556Srgrimes *
754245Sgreen * Permission to use, copy, modify, and distribute this software for any
854245Sgreen * purpose with or without fee is hereby granted, provided that the above
91556Srgrimes * copyright notice and this permission notice appear in all copies.
10126666Sphk *
11126666Sphk * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
12126666Sphk * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
13126666Sphk * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
14126666Sphk * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15126666Sphk * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
16126666Sphk * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
17126666Sphk * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18126667Sphk */
19126666Sphk
20126666Sphk#if !defined(_KERNEL) && !defined(_STANDALONE)
21126666Sphk#if HAVE_NBTOOL_CONFIG_H
22126666Sphk#include "nbtool_config.h"
23126666Sphk#endif
24126666Sphk
25126666Sphk#include <sys/cdefs.h>
26#if defined(LIBC_SCCS) && !defined(lint)
27__RCSID("$NetBSD: strlcpy.c,v 1.2 2006/03/30 20:37:51 christos Exp $");
28#endif /* LIBC_SCCS and not lint */
29
30#ifdef _LIBC
31#include "namespace.h"
32#endif
33#include <sys/types.h>
34#include <assert.h>
35#include <string.h>
36
37#ifdef _LIBC
38# ifdef __weak_alias
39__weak_alias(strlcpy, _strlcpy)
40# endif
41#endif
42#else
43#include <lib/libkern/libkern.h>
44#endif /* !_KERNEL && !_STANDALONE */
45
46
47#if !HAVE_STRLCPY
48/*
49 * Copy src to string dst of size siz.  At most siz-1 characters
50 * will be copied.  Always NUL terminates (unless siz == 0).
51 * Returns strlen(src); if retval >= siz, truncation occurred.
52 */
53size_t
54strlcpy(char *dst, const char *src, size_t siz)
55{
56	char *d = dst;
57	const char *s = src;
58	size_t n = siz;
59
60	_DIAGASSERT(dst != NULL);
61	_DIAGASSERT(src != NULL);
62
63	/* Copy as many bytes as will fit */
64	if (n != 0 && --n != 0) {
65		do {
66			if ((*d++ = *s++) == 0)
67				break;
68		} while (--n != 0);
69	}
70
71	/* Not enough room in dst, add NUL and traverse rest of src */
72	if (n == 0) {
73		if (siz != 0)
74			*d = '\0';		/* NUL-terminate dst */
75		while (*s++)
76			;
77	}
78
79	return(s - src - 1);	/* count does not include NUL */
80}
81#endif
82