1 dd038bc6 2021-09-21 thomas.ad /* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
4 dd038bc6 2021-09-21 thomas.ad * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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.
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.
19 dd038bc6 2021-09-21 thomas.ad #include <sys/types.h>
20 dd038bc6 2021-09-21 thomas.ad #include <string.h>
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.
30 dd038bc6 2021-09-21 thomas.ad strlcat(char *dst, const char *src, size_t siz)
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;
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')
40 dd038bc6 2021-09-21 thomas.ad dlen = d - dst;
41 dd038bc6 2021-09-21 thomas.ad n = siz - dlen;
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;
52 dd038bc6 2021-09-21 thomas.ad *d = '\0';
54 dd038bc6 2021-09-21 thomas.ad return(dlen + (s - src)); /* count does not include NUL */