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strlcat.c
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1 /*
2  * src/port/strlcat.c
3  *
4  * $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
5 
6 /*
7  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
8  *
9  * Permission to use, copy, modify, and distribute this software for any
10  * purpose with or without fee is hereby granted, provided that the above
11  * copyright notice and this permission notice appear in all copies.
12  *
13  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20  */
21 
22 #include "c.h"
23 
24 
25 /*
26  * Appends src to string dst of size siz (unlike strncat, siz is the
27  * full size of dst, not space left). At most siz-1 characters
28  * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
29  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
30  * If retval >= siz, truncation occurred.
31  */
32 size_t
33 strlcat(char *dst, const char *src, size_t siz)
34 {
35  char *d = dst;
36  const char *s = src;
37  size_t n = siz;
38  size_t dlen;
39 
40  /* Find the end of dst and adjust bytes left but don't go past end */
41  while (n-- != 0 && *d != '\0')
42  d++;
43  dlen = d - dst;
44  n = siz - dlen;
45 
46  if (n == 0)
47  return (dlen + strlen(s));
48  while (*s != '\0')
49  {
50  if (n != 1)
51  {
52  *d++ = *s;
53  n--;
54  }
55  s++;
56  }
57  *d = '\0';
58 
59  return (dlen + (s - src)); /* count does not include NUL */
60 }
size_t strlcat(char *dst, const char *src, size_t siz)
Definition: strlcat.c:33