1/*	$OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $	*/
2
3/*
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include "config.h"
20
21#ifndef HAVE_STRLCPY
22#include <sys/cdefs.h>
23#include <sys/types.h>
24#include <string.h>
25
26/*
27 * Copy src to string dst of size siz.  At most siz-1 characters
28 * will be copied.  Always NUL terminates (unless siz == 0).
29 * Returns strlen(src); if retval >= siz, truncation occurred.
30 */
31size_t
32strlcpy(char * dst, const char * src, size_t siz)
33{
34    char *d = dst;
35    const char *s = src;
36    size_t n = siz;
37
38    /* Copy as many bytes as will fit */
39    if (n != 0) {
40	while (--n != 0) {
41	    if ((*d++ = *s++) == '\0')
42		break;
43	}
44    }
45
46    /* Not enough room in dst, add NUL and traverse rest of src */
47    if (n == 0) {
48	if (siz != 0)
49	    *d = '\0';		/* NUL-terminate dst */
50	while (*s++)
51	    ;
52    }
53
54    return(s - src - 1);	/* count does not include NUL */
55}
56#endif /* HAVE_STRLCPY */
57