1/* compat/strlcat.c */
2
3/*-
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30/* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
31
32#include "config.h"
33#ifndef HAVE_STRLCAT
34
35#include <sys/types.h>
36#include <string.h>
37
38/*
39 * Appends src to string dst of size siz (unlike strncat, siz is the
40 * full size of dst, not space left).  At most siz-1 characters
41 * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
42 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
43 * If retval >= siz, truncation occurred.
44 */
45size_t
46strlcat(char *dst, const char *src, size_t siz)
47{
48	char *d = dst;
49	const char *s = src;
50	size_t n = siz;
51	size_t dlen;
52
53	/* Find the end of dst and adjust bytes left but don't go past end */
54	while (n-- != 0 && *d != '\0')
55		d++;
56	dlen = d - dst;
57	n = siz - dlen;
58
59	if (n == 0)
60		return(dlen + strlen(s));
61	while (*s != '\0') {
62		if (n != 1) {
63			*d++ = *s;
64			n--;
65		}
66		s++;
67	}
68	*d = '\0';
69
70	return(dlen + (s - src));	/* count does not include NUL */
71}
72
73#endif /* !HAVE_STRLCAT */
74