1*b636d99dSDavid van Moolenbroek /* NetBSD: strlcat.c,v 1.5 1999/09/20 04:39:47 lukem Exp */
2*b636d99dSDavid van Moolenbroek /* from OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp */
3*b636d99dSDavid van Moolenbroek
4*b636d99dSDavid van Moolenbroek /*
5*b636d99dSDavid van Moolenbroek * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
6*b636d99dSDavid van Moolenbroek * All rights reserved.
7*b636d99dSDavid van Moolenbroek *
8*b636d99dSDavid van Moolenbroek * Redistribution and use in source and binary forms, with or without
9*b636d99dSDavid van Moolenbroek * modification, are permitted provided that the following conditions
10*b636d99dSDavid van Moolenbroek * are met:
11*b636d99dSDavid van Moolenbroek * 1. Redistributions of source code must retain the above copyright
12*b636d99dSDavid van Moolenbroek * notice, this list of conditions and the following disclaimer.
13*b636d99dSDavid van Moolenbroek * 2. Redistributions in binary form must reproduce the above copyright
14*b636d99dSDavid van Moolenbroek * notice, this list of conditions and the following disclaimer in the
15*b636d99dSDavid van Moolenbroek * documentation and/or other materials provided with the distribution.
16*b636d99dSDavid van Moolenbroek * 3. The name of the author may not be used to endorse or promote products
17*b636d99dSDavid van Moolenbroek * derived from this software without specific prior written permission.
18*b636d99dSDavid van Moolenbroek *
19*b636d99dSDavid van Moolenbroek * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
20*b636d99dSDavid van Moolenbroek * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
21*b636d99dSDavid van Moolenbroek * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22*b636d99dSDavid van Moolenbroek * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23*b636d99dSDavid van Moolenbroek * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24*b636d99dSDavid van Moolenbroek * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25*b636d99dSDavid van Moolenbroek * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26*b636d99dSDavid van Moolenbroek * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27*b636d99dSDavid van Moolenbroek * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28*b636d99dSDavid van Moolenbroek * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29*b636d99dSDavid van Moolenbroek */
30*b636d99dSDavid van Moolenbroek
31*b636d99dSDavid van Moolenbroek #ifdef HAVE_CONFIG_H
32*b636d99dSDavid van Moolenbroek #include <config.h>
33*b636d99dSDavid van Moolenbroek #endif
34*b636d99dSDavid van Moolenbroek
35*b636d99dSDavid van Moolenbroek #include <tcpdump-stdinc.h>
36*b636d99dSDavid van Moolenbroek
37*b636d99dSDavid van Moolenbroek #include <string.h>
38*b636d99dSDavid van Moolenbroek
39*b636d99dSDavid van Moolenbroek #include "interface.h"
40*b636d99dSDavid van Moolenbroek
41*b636d99dSDavid van Moolenbroek /*
42*b636d99dSDavid van Moolenbroek * Appends src to string dst of size siz (unlike strncat, siz is the
43*b636d99dSDavid van Moolenbroek * full size of dst, not space left). At most siz-1 characters
44*b636d99dSDavid van Moolenbroek * will be copied. Always NUL terminates (unless siz == 0).
45*b636d99dSDavid van Moolenbroek * Returns strlen(src); if retval >= siz, truncation occurred.
46*b636d99dSDavid van Moolenbroek */
47*b636d99dSDavid van Moolenbroek size_t
strlcat(char * dst,const char * src,size_t siz)48*b636d99dSDavid van Moolenbroek strlcat(char *dst, const char *src, size_t siz)
49*b636d99dSDavid van Moolenbroek {
50*b636d99dSDavid van Moolenbroek register char *d = dst;
51*b636d99dSDavid van Moolenbroek register const char *s = src;
52*b636d99dSDavid van Moolenbroek register size_t n = siz;
53*b636d99dSDavid van Moolenbroek size_t dlen;
54*b636d99dSDavid van Moolenbroek
55*b636d99dSDavid van Moolenbroek /* Find the end of dst and adjust bytes left but don't go past end */
56*b636d99dSDavid van Moolenbroek while (*d != '\0' && n-- != 0)
57*b636d99dSDavid van Moolenbroek d++;
58*b636d99dSDavid van Moolenbroek dlen = d - dst;
59*b636d99dSDavid van Moolenbroek n = siz - dlen;
60*b636d99dSDavid van Moolenbroek
61*b636d99dSDavid van Moolenbroek if (n == 0)
62*b636d99dSDavid van Moolenbroek return(dlen + strlen(s));
63*b636d99dSDavid van Moolenbroek while (*s != '\0') {
64*b636d99dSDavid van Moolenbroek if (n != 1) {
65*b636d99dSDavid van Moolenbroek *d++ = *s;
66*b636d99dSDavid van Moolenbroek n--;
67*b636d99dSDavid van Moolenbroek }
68*b636d99dSDavid van Moolenbroek s++;
69*b636d99dSDavid van Moolenbroek }
70*b636d99dSDavid van Moolenbroek *d = '\0';
71*b636d99dSDavid van Moolenbroek
72*b636d99dSDavid van Moolenbroek return(dlen + (s - src)); /* count does not include NUL */
73*b636d99dSDavid van Moolenbroek }
74