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Damien Miller3db2e4d2003-11-24 13:33:34 +11001/* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
2
Ben Lindstromaf4a6c32003-08-25 01:10:51 +00003/* $OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $ */
Damien Millerb3ca3aa1999-11-22 13:57:07 +11004
5/*
6 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
Damien Millerb3ca3aa1999-11-22 13:57:07 +11007 *
Damien Millere323df62003-05-18 22:24:09 +10008 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
Damien Millerb3ca3aa1999-11-22 13:57:07 +110011 *
Ben Lindstromaf4a6c32003-08-25 01:10:51 +000012 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Damien Millerb3ca3aa1999-11-22 13:57:07 +110019 */
20
Ben Lindstromdd21fe92002-06-27 18:23:20 +000021#include "includes.h"
Damien Millerb3ca3aa1999-11-22 13:57:07 +110022#ifndef HAVE_STRLCAT
23
24#if defined(LIBC_SCCS) && !defined(lint)
Ben Lindstromaf4a6c32003-08-25 01:10:51 +000025static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $";
Damien Millerb3ca3aa1999-11-22 13:57:07 +110026#endif /* LIBC_SCCS and not lint */
27
28#include <sys/types.h>
29#include <string.h>
30
31/*
32 * Appends src to string dst of size siz (unlike strncat, siz is the
33 * full size of dst, not space left). At most siz-1 characters
Damien Miller6e77a532001-04-14 00:22:33 +100034 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
Damien Miller180207f2001-06-28 14:48:28 +100035 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
36 * If retval >= siz, truncation occurred.
Damien Millerb3ca3aa1999-11-22 13:57:07 +110037 */
Damien Miller180207f2001-06-28 14:48:28 +100038size_t
Damien Millere323df62003-05-18 22:24:09 +100039strlcat(char *dst, const char *src, size_t siz)
Damien Millerb3ca3aa1999-11-22 13:57:07 +110040{
41 register char *d = dst;
42 register const char *s = src;
43 register size_t n = siz;
44 size_t dlen;
45
46 /* Find the end of dst and adjust bytes left but don't go past end */
Damien Miller6e77a532001-04-14 00:22:33 +100047 while (n-- != 0 && *d != '\0')
Damien Millerb3ca3aa1999-11-22 13:57:07 +110048 d++;
49 dlen = d - dst;
50 n = siz - dlen;
51
52 if (n == 0)
53 return(dlen + strlen(s));
54 while (*s != '\0') {
55 if (n != 1) {
56 *d++ = *s;
57 n--;
58 }
59 s++;
60 }
61 *d = '\0';
62
63 return(dlen + (s - src)); /* count does not include NUL */
64}
65
66#endif /* !HAVE_STRLCAT */