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