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Damien Miller6e77a532001-04-14 00:22:33 +10001/* $OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp $ */
Damien Millerb3ca3aa1999-11-22 13:57:07 +11002
3/*
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "config.h"
31#ifndef HAVE_STRLCAT
32
33#if defined(LIBC_SCCS) && !defined(lint)
Damien Miller6e77a532001-04-14 00:22:33 +100034static char *rcsid = "$OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp $";
Damien Millerb3ca3aa1999-11-22 13:57:07 +110035#endif /* LIBC_SCCS and not lint */
36
37#include <sys/types.h>
38#include <string.h>
Damien Miller79b332d2001-06-27 23:36:08 +100039#include "strlcat.h"
Damien Millerb3ca3aa1999-11-22 13:57:07 +110040
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
Damien Miller6e77a532001-04-14 00:22:33 +100044 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
45 * Returns strlen(initial dst) + strlen(src); if retval >= siz,
46 * truncation occurred.
Damien Millerb3ca3aa1999-11-22 13:57:07 +110047 */
48size_t strlcat(dst, src, siz)
49 char *dst;
50 const char *src;
51 size_t siz;
52{
53 register char *d = dst;
54 register const char *s = src;
55 register size_t n = siz;
56 size_t dlen;
57
58 /* Find the end of dst and adjust bytes left but don't go past end */
Damien Miller6e77a532001-04-14 00:22:33 +100059 while (n-- != 0 && *d != '\0')
Damien Millerb3ca3aa1999-11-22 13:57:07 +110060 d++;
61 dlen = d - dst;
62 n = siz - dlen;
63
64 if (n == 0)
65 return(dlen + strlen(s));
66 while (*s != '\0') {
67 if (n != 1) {
68 *d++ = *s;
69 n--;
70 }
71 s++;
72 }
73 *d = '\0';
74
75 return(dlen + (s - src)); /* count does not include NUL */
76}
77
78#endif /* !HAVE_STRLCAT */