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510a42ce 1/* $OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $ */
b09a984b 2
3/*
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
b09a984b 5 *
bffa6723 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.
b09a984b 9 *
510a42ce 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.
b09a984b 17 */
18
17962c40 19#include "includes.h"
b09a984b 20#ifndef HAVE_STRLCAT
21
22#if defined(LIBC_SCCS) && !defined(lint)
510a42ce 23static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $";
b09a984b 24#endif /* LIBC_SCCS and not lint */
25
26#include <sys/types.h>
27#include <string.h>
28
29/*
30 * Appends src to string dst of size siz (unlike strncat, siz is the
31 * full size of dst, not space left). At most siz-1 characters
e400a640 32 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
f11065cb 33 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
34 * If retval >= siz, truncation occurred.
b09a984b 35 */
f11065cb 36size_t
bffa6723 37strlcat(char *dst, const char *src, size_t siz)
b09a984b 38{
39 register char *d = dst;
40 register const char *s = src;
41 register size_t n = siz;
42 size_t dlen;
43
44 /* Find the end of dst and adjust bytes left but don't go past end */
e400a640 45 while (n-- != 0 && *d != '\0')
b09a984b 46 d++;
47 dlen = d - dst;
48 n = siz - dlen;
49
50 if (n == 0)
51 return(dlen + strlen(s));
52 while (*s != '\0') {
53 if (n != 1) {
54 *d++ = *s;
55 n--;
56 }
57 s++;
58 }
59 *d = '\0';
60
61 return(dlen + (s - src)); /* count does not include NUL */
62}
63
64#endif /* !HAVE_STRLCAT */
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