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strlcat.c
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1 /*
2  * strlcat.c Concatenate strings.
3  *
4  * Version: $Id: b44720604df4f7798242b7f25067b33fdbaa57fb $
5  *
6  */
7 
8 /*
9  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
10  *
11  * Permission to use, copy, modify, and distribute this software for any
12  * purpose with or without fee is hereby granted, provided that the above
13  * copyright notice and this permission notice appear in all copies.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
16  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
17  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
18  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22  *
23  * Copyright 2006 The FreeRADIUS server project
24  */
25 
26 RCSID("$Id: b44720604df4f7798242b7f25067b33fdbaa57fb $")
27 
28 #ifndef HAVE_STRLCAT
29 
30 #include <freeradius-devel/missing.h>
31 
32 /*
33  * Appends src to string dst of size siz (unlike strncat, siz is the
34  * full size of dst, not space left). At most siz-1 characters
35  * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
36  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
37  * If retval >= siz, truncation occurred.
38  */
39 size_t
40 strlcat(char *dst, char const *src, size_t siz)
41 {
42  char *d = dst;
43  char const *s = src;
44  size_t n = siz;
45  size_t dlen;
46 
47  /* Find the end of dst and adjust bytes left but don't go past end */
48  while (n-- != 0 && *d != '\0')
49  d++;
50  dlen = d - dst;
51  n = siz - dlen;
52 
53  if (n == 0)
54  return(dlen + strlen(s));
55  while (*s != '\0') {
56  if (n != 1) {
57  *d++ = *s;
58  n--;
59  }
60  s++;
61  }
62  *d = '\0';
63 
64  return(dlen + (s - src)); /* count does not include NUL */
65 }
66 
67 #endif
#define RCSID(id)
Definition: build.h:135
size_t strlcat(char *dst, char const *src, size_t siz)
Definition: strlcat.c:40