1 /* $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $ */
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char *rcsid
= "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $";
32 #endif /* LIBC_SCCS and not lint */
34 #include <sys/types.h>
38 * Appends src to string dst of size siz (unlike strncat, siz is the
39 * full size of dst, not space left). At most siz-1 characters
40 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
41 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
42 * If retval >= siz, truncation occurred.
45 strlcat(char *dst
, const char *src
, size_t siz
)
47 register char *d
= dst
;
48 register const char *s
= src
;
49 register size_t n
= siz
;
52 /* Find the end of dst and adjust bytes left but don't go past end */
53 while (n
-- != 0 && *d
!= '\0')
59 return(dlen
+ strlen(s
));
69 return(dlen
+ (s
- src
)); /* count does not include NUL */