1/*
2 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * dollar OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp dollar
28 * $P4: //depot/projects/trustedbsd/openbsm/compat/strlcpy.h#1 $
29 */
30
31/*
32 * Copy src to string dst of size siz.  At most siz-1 characters
33 * will be copied.  Always NUL terminates (unless siz == 0).
34 * Returns strlen(src); if retval >= siz, truncation occurred.
35 */
36static size_t
37strlcpy(dst, src, siz)
38	char *dst;
39	const char *src;
40	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