1/*	$Id: compat_strlcpy.c,v 1.6 2020/06/15 20:49:57 schwarze Exp $	*/
2/*	$OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $	*/
3
4/*
5 * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
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#include "config.h"
20
21#include <sys/types.h>
22#include <string.h>
23
24/*
25 * Copy string src to buffer dst of size dsize.  At most dsize-1
26 * chars will be copied.  Always NUL terminates (unless dsize == 0).
27 * Returns strlen(src); if retval >= dsize, truncation occurred.
28 */
29size_t
30strlcpy(char *dst, const char *src, size_t dsize)
31{
32	const char *osrc = src;
33	size_t nleft = dsize;
34
35	/* Copy as many bytes as will fit. */
36	if (nleft != 0) {
37		while (--nleft != 0) {
38			if ((*dst++ = *src++) == '\0')
39				break;
40		}
41	}
42
43	/* Not enough room in dst, add NUL and traverse rest of src. */
44	if (nleft == 0) {
45		if (dsize != 0)
46			*dst = '\0';		/* NUL-terminate dst */
47		while (*src++)
48			;
49	}
50
51	return(src - osrc - 1);	/* count does not include NUL */
52}
53