1 /*-
2 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * dollar OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp dollar
28 */
29
30 /*
31 * Appends src to string dst of size siz (unlike strncat, siz is the
32 * full size of dst, not space left). At most siz-1 characters
33 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
34 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
35 * If retval >= siz, truncation occurred.
36 */
37 static size_t
strlcat(dst,src,siz)38 strlcat(dst, src, siz)
39 char *dst;
40 const char *src;
41 size_t siz;
42 {
43 char *d = dst;
44 const char *s = src;
45 size_t n = siz;
46 size_t dlen;
47
48 /* Find the end of dst and adjust bytes left but don't go past end */
49 while (n-- != 0 && *d != '\0')
50 d++;
51 dlen = d - dst;
52 n = siz - dlen;
53
54 if (n == 0)
55 return(dlen + strlen(s));
56 while (*s != '\0') {
57 if (n != 1) {
58 *d++ = *s;
59 n--;
60 }
61 s++;
62 }
63 *d = '\0';
64
65 return(dlen + (s - src)); /* count does not include NUL */
66 }
67