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2c06c99b 1/* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
3c0ef626 2
3/*
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
3c0ef626 5 *
0fff78ff 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.
3c0ef626 9 *
0fff78ff 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.
3c0ef626 17 */
18
2c06c99b 19/* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
20
41b2f314 21#include "includes.h"
3c0ef626 22#ifndef HAVE_STRLCAT
23
3c0ef626 24#include <sys/types.h>
25#include <string.h>
3c0ef626 26
27/*
28 * Appends src to string dst of size siz (unlike strncat, siz is the
29 * full size of dst, not space left). At most siz-1 characters
30 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
31 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
32 * If retval >= siz, truncation occurred.
33 */
34size_t
0fff78ff 35strlcat(char *dst, const char *src, size_t siz)
3c0ef626 36{
2c06c99b 37 char *d = dst;
38 const char *s = src;
39 size_t n = siz;
3c0ef626 40 size_t dlen;
41
42 /* Find the end of dst and adjust bytes left but don't go past end */
43 while (n-- != 0 && *d != '\0')
44 d++;
45 dlen = d - dst;
46 n = siz - dlen;
47
48 if (n == 0)
49 return(dlen + strlen(s));
50 while (*s != '\0') {
51 if (n != 1) {
52 *d++ = *s;
53 n--;
54 }
55 s++;
56 }
57 *d = '\0';
58
59 return(dlen + (s - src)); /* count does not include NUL */
60}
61
62#endif /* !HAVE_STRLCAT */
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