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
28 /* $Id$ */
29
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #ifndef HAVE_STRLCAT
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char *rcsid = "$OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp $";
38 #endif /* LIBC_SCCS and not lint */
39
40 #include <sys/types.h>
41 #include <string.h>
42
43 /*
44 * Appends src to string dst of size siz (unlike strncat, siz is the
45 * full size of dst, not space left). At most siz-1 characters
46 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
47 * Returns strlen(initial dst) + strlen(src); if retval >= siz,
48 * truncation occurred.
49 */
strlcat(char * dst,const char * src,size_t siz)50 size_t strlcat(char *dst, const char *src, size_t siz)
51 {
52 register char *d = dst;
53 register const char *s = src;
54 register size_t n = siz;
55 size_t dlen;
56
57 /* Find the end of dst and adjust bytes left but don't go past end */
58 while (n-- != 0 && *d != '\0')
59 d++;
60 dlen = d - dst;
61 n = siz - dlen;
62
63 if (n == 0)
64 return(dlen + strlen(s));
65 while (*s != '\0') {
66 if (n != 1) {
67 *d++ = *s;
68 n--;
69 }
70 s++;
71 }
72 *d = '\0';
73
74 return(dlen + (s - src)); /* count does not include NUL */
75 }
76 #endif
77