libpcap  1.10.1
About: libpcap is a packet filter library used by tools like tcpdump.
  Fossies Dox: libpcap-1.10.1.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

strlcat.c
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1 /* $OpenBSD: pcap_strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $ */
2 
3 /*
4  * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #ifdef HAVE_CONFIG_H
20 #include <config.h>
21 #endif
22 
23 #include <stddef.h>
24 #include <string.h>
25 
26 #include "portability.h"
27 
28 /*
29  * Appends src to string dst of size dsize (unlike strncat, dsize is the
30  * full size of dst, not space left). At most dsize-1 characters
31  * will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
32  * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
33  * If retval >= dsize, truncation occurred.
34  */
35 size_t
36 pcap_strlcat(char * restrict dst, const char * restrict src, size_t dsize)
37 {
38  const char *odst = dst;
39  const char *osrc = src;
40  size_t n = dsize;
41  size_t dlen;
42 
43  /* Find the end of dst and adjust bytes left but don't go past end. */
44  while (n-- != 0 && *dst != '\0')
45  dst++;
46  dlen = dst - odst;
47  n = dsize - dlen;
48 
49  if (n-- == 0)
50  return(dlen + strlen(src));
51  while (*src != '\0') {
52  if (n != 0) {
53  *dst++ = *src;
54  n--;
55  }
56  src++;
57  }
58  *dst = '\0';
59 
60  return(dlen + (src - osrc)); /* count does not include NUL */
61 }
size_t pcap_strlcat(char *restrict dst, const char *restrict src, size_t dsize)
Definition: strlcat.c:36