1 dd038bc6 2021-09-21 thomas.ad /*	$OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $	*/
 2 dd038bc6 2021-09-21 thomas.ad 
 3 dd038bc6 2021-09-21 thomas.ad /*
 4 dd038bc6 2021-09-21 thomas.ad  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 5 dd038bc6 2021-09-21 thomas.ad  *
 6 dd038bc6 2021-09-21 thomas.ad  * Permission to use, copy, modify, and distribute this software for any
 7 dd038bc6 2021-09-21 thomas.ad  * purpose with or without fee is hereby granted, provided that the above
 8 dd038bc6 2021-09-21 thomas.ad  * copyright notice and this permission notice appear in all copies.
 9 dd038bc6 2021-09-21 thomas.ad  *
10 dd038bc6 2021-09-21 thomas.ad  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 dd038bc6 2021-09-21 thomas.ad  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 dd038bc6 2021-09-21 thomas.ad  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 dd038bc6 2021-09-21 thomas.ad  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 dd038bc6 2021-09-21 thomas.ad  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 dd038bc6 2021-09-21 thomas.ad  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 dd038bc6 2021-09-21 thomas.ad  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 dd038bc6 2021-09-21 thomas.ad  */
18 dd038bc6 2021-09-21 thomas.ad 
19 dd038bc6 2021-09-21 thomas.ad #include <sys/types.h>
20 dd038bc6 2021-09-21 thomas.ad #include <string.h>
21 dd038bc6 2021-09-21 thomas.ad 
22 dd038bc6 2021-09-21 thomas.ad /*
23 dd038bc6 2021-09-21 thomas.ad  * Appends src to string dst of size siz (unlike strncat, siz is the
24 dd038bc6 2021-09-21 thomas.ad  * full size of dst, not space left).  At most siz-1 characters
25 dd038bc6 2021-09-21 thomas.ad  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
26 dd038bc6 2021-09-21 thomas.ad  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
27 dd038bc6 2021-09-21 thomas.ad  * If retval >= siz, truncation occurred.
28 dd038bc6 2021-09-21 thomas.ad  */
29 dd038bc6 2021-09-21 thomas.ad size_t
30 dd038bc6 2021-09-21 thomas.ad strlcat(char *dst, const char *src, size_t siz)
31 dd038bc6 2021-09-21 thomas.ad {
32 dd038bc6 2021-09-21 thomas.ad 	char *d = dst;
33 dd038bc6 2021-09-21 thomas.ad 	const char *s = src;
34 dd038bc6 2021-09-21 thomas.ad 	size_t n = siz;
35 dd038bc6 2021-09-21 thomas.ad 	size_t dlen;
36 dd038bc6 2021-09-21 thomas.ad 
37 dd038bc6 2021-09-21 thomas.ad 	/* Find the end of dst and adjust bytes left but don't go past end */
38 dd038bc6 2021-09-21 thomas.ad 	while (n-- != 0 && *d != '\0')
39 dd038bc6 2021-09-21 thomas.ad 		d++;
40 dd038bc6 2021-09-21 thomas.ad 	dlen = d - dst;
41 dd038bc6 2021-09-21 thomas.ad 	n = siz - dlen;
42 dd038bc6 2021-09-21 thomas.ad 
43 dd038bc6 2021-09-21 thomas.ad 	if (n == 0)
44 dd038bc6 2021-09-21 thomas.ad 		return(dlen + strlen(s));
45 dd038bc6 2021-09-21 thomas.ad 	while (*s != '\0') {
46 dd038bc6 2021-09-21 thomas.ad 		if (n != 1) {
47 dd038bc6 2021-09-21 thomas.ad 			*d++ = *s;
48 dd038bc6 2021-09-21 thomas.ad 			n--;
49 dd038bc6 2021-09-21 thomas.ad 		}
50 dd038bc6 2021-09-21 thomas.ad 		s++;
51 dd038bc6 2021-09-21 thomas.ad 	}
52 dd038bc6 2021-09-21 thomas.ad 	*d = '\0';
53 dd038bc6 2021-09-21 thomas.ad 
54 dd038bc6 2021-09-21 thomas.ad 	return(dlen + (s - src));	/* count does not include NUL */
55 dd038bc6 2021-09-21 thomas.ad }