1/*	$NetBSD: strlcpy.c,v 1.1.1.5 2023/08/18 18:36:49 christos Exp $	*/
2
3/*	$OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $	*/
4
5/*
6 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21/* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */
22#include "file.h"
23#ifndef lint
24#if 0
25FILE_RCSID("@(#)$File: strlcpy.c,v 1.5 2022/09/24 20:30:13 christos Exp $")
26#else
27__RCSID("$NetBSD: strlcpy.c,v 1.1.1.5 2023/08/18 18:36:49 christos Exp $");
28#endif
29#endif
30
31#include <sys/types.h>
32#include <string.h>
33
34/*
35 * Copy src to string dst of size siz.  At most siz-1 characters
36 * will be copied.  Always NUL terminates (unless siz == 0).
37 * Returns strlen(src); if retval >= siz, truncation occurred.
38 */
39size_t
40strlcpy(char *dst, const char *src, size_t siz)
41{
42	char *d = dst;
43	const char *s = src;
44	size_t n = siz;
45
46	/* Copy as many bytes as will fit */
47	if (n != 0 && --n != 0) {
48		do {
49			if ((*d++ = *s++) == 0)
50				break;
51		} while (--n != 0);
52	}
53
54	/* Not enough room in dst, add NUL and traverse rest of src */
55	if (n == 0) {
56		if (siz != 0)
57			*d = '\0';		/* NUL-terminate dst */
58		while (*s++)
59			;
60	}
61
62	return(s - src - 1);	/* count does not include NUL */
63}
64