1/*
 2 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 3 *
 4 * Permission to use, copy, modify, and distribute this software for any
 5 * purpose with or without fee is hereby granted, provided that the above
 6 * copyright notice and this permission notice appear in all copies.
 7 *
 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include <string.h>
18#include <sys/types.h>
19
20#include "../util.h"
21
22/*
23 * Appends src to string dst of size siz (unlike strncat, siz is the
24 * full size of dst, not space left). At most siz-1 characters
25 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
26 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
27 * If retval >= siz, truncation occurred.
28 */
29size_t
30strlcat(char *dst, const char *src, size_t siz)
31{
32	char *d = dst;
33	const char *s = src;
34	size_t n = siz;
35	size_t dlen;
36	/* Find the end of dst and adjust bytes left but don't go past end */
37	while (n-- != 0 && *d != '\0')
38		d++;
39	dlen = d - dst;
40	n = siz - dlen;
41	if (n == 0)
42		return(dlen + strlen(s));
43	while (*s != '\0') {
44		if (n != 1) {
45			*d++ = *s;
46			n--;
47		}
48		s++;
49	}
50	*d = '\0';
51	return(dlen + (s - src)); /* count does not include NUL */
52}
53
54size_t
55estrlcat(char *dst, const char *src, size_t siz)
56{
57	size_t ret;
58
59	if ((ret = strlcat(dst, src, siz)) >= siz)
60		eprintf("strlcat: input string too long\n");
61
62	return ret;
63}