1 babf5d5a 2021-05-11 martijn /*	$OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $	*/
 2 babf5d5a 2021-05-11 martijn 
 3 babf5d5a 2021-05-11 martijn /*
 4 babf5d5a 2021-05-11 martijn  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 5 babf5d5a 2021-05-11 martijn  *
 6 babf5d5a 2021-05-11 martijn  * Permission to use, copy, modify, and distribute this software for any
 7 babf5d5a 2021-05-11 martijn  * purpose with or without fee is hereby granted, provided that the above
 8 babf5d5a 2021-05-11 martijn  * copyright notice and this permission notice appear in all copies.
 9 babf5d5a 2021-05-11 martijn  *
10 babf5d5a 2021-05-11 martijn  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 babf5d5a 2021-05-11 martijn  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 babf5d5a 2021-05-11 martijn  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 babf5d5a 2021-05-11 martijn  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 babf5d5a 2021-05-11 martijn  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 babf5d5a 2021-05-11 martijn  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 babf5d5a 2021-05-11 martijn  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 babf5d5a 2021-05-11 martijn  */
18 babf5d5a 2021-05-11 martijn 
19 babf5d5a 2021-05-11 martijn /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
20 babf5d5a 2021-05-11 martijn 
21 babf5d5a 2021-05-11 martijn #include "openbsd-compat.h"
22 babf5d5a 2021-05-11 martijn 
23 babf5d5a 2021-05-11 martijn #include <sys/types.h>
24 babf5d5a 2021-05-11 martijn #include <string.h>
25 babf5d5a 2021-05-11 martijn 
26 babf5d5a 2021-05-11 martijn /*
27 babf5d5a 2021-05-11 martijn  * Appends src to string dst of size siz (unlike strncat, siz is the
28 babf5d5a 2021-05-11 martijn  * full size of dst, not space left).  At most siz-1 characters
29 babf5d5a 2021-05-11 martijn  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
30 babf5d5a 2021-05-11 martijn  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
31 babf5d5a 2021-05-11 martijn  * If retval >= siz, truncation occurred.
32 babf5d5a 2021-05-11 martijn  */
33 babf5d5a 2021-05-11 martijn size_t
34 babf5d5a 2021-05-11 martijn strlcat(char *dst, const char *src, size_t siz)
35 babf5d5a 2021-05-11 martijn {
36 babf5d5a 2021-05-11 martijn 	char *d = dst;
37 babf5d5a 2021-05-11 martijn 	const char *s = src;
38 babf5d5a 2021-05-11 martijn 	size_t n = siz;
39 babf5d5a 2021-05-11 martijn 	size_t dlen;
40 babf5d5a 2021-05-11 martijn 
41 babf5d5a 2021-05-11 martijn 	/* Find the end of dst and adjust bytes left but don't go past end */
42 babf5d5a 2021-05-11 martijn 	while (n-- != 0 && *d != '\0')
43 babf5d5a 2021-05-11 martijn 		d++;
44 babf5d5a 2021-05-11 martijn 	dlen = d - dst;
45 babf5d5a 2021-05-11 martijn 	n = siz - dlen;
46 babf5d5a 2021-05-11 martijn 
47 babf5d5a 2021-05-11 martijn 	if (n == 0)
48 babf5d5a 2021-05-11 martijn 		return(dlen + strlen(s));
49 babf5d5a 2021-05-11 martijn 	while (*s != '\0') {
50 babf5d5a 2021-05-11 martijn 		if (n != 1) {
51 babf5d5a 2021-05-11 martijn 			*d++ = *s;
52 babf5d5a 2021-05-11 martijn 			n--;
53 babf5d5a 2021-05-11 martijn 		}
54 babf5d5a 2021-05-11 martijn 		s++;
55 babf5d5a 2021-05-11 martijn 	}
56 babf5d5a 2021-05-11 martijn 	*d = '\0';
57 babf5d5a 2021-05-11 martijn 
58 babf5d5a 2021-05-11 martijn 	return(dlen + (s - src));	/* count does not include NUL */
59 babf5d5a 2021-05-11 martijn }