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: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp dollar
28 * $P4: //depot/projects/trustedbsd/openbsm/compat/strlcat.h#3 $
29 */
30
31/*
32 * Appends src to string dst of size siz (unlike strncat, siz is the
33 * full size of dst, not space left).  At most siz-1 characters
34 * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
35 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
36 * If retval >= siz, truncation occurred.
37 */
38static size_t
39strlcat(dst, src, siz)
40	char *dst;
41	const char *src;
42	size_t siz;
43{
44	char *d = dst;
45	const char *s = src;
46	size_t n = siz;
47	size_t dlen;
48
49	/* Find the end of dst and adjust bytes left but don't go past end */
50	while (n-- != 0 && *d != '\0')
51		d++;
52	dlen = d - dst;
53	n = siz - dlen;
54
55	if (n == 0)
56		return(dlen + strlen(s));
57	while (*s != '\0') {
58		if (n != 1) {
59			*d++ = *s;
60			n--;
61		}
62		s++;
63	}
64	*d = '\0';
65
66	return(dlen + (s - src));	/* count does not include NUL */
67}
68