1 /* $OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 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: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $";
32 #endif /* LIBC_SCCS and not lint */
34 #include <sys/types.h>
38 * Copy src to string dst of size siz. At most siz-1 characters
39 * will be copied. Always NUL terminates (unless siz == 0).
40 * Returns strlen(src); if retval >= siz, truncation occurred.
43 _DEFUN (strlcpy
, (dst
, src
, siz
),
48 register char *d
= dst
;
49 register const char *s
= src
;
50 register size_t n
= siz
;
52 /* Copy as many bytes as will fit */
53 if (n
!= 0 && --n
!= 0) {
55 if ((*d
++ = *s
++) == 0)
60 /* Not enough room in dst, add NUL and traverse rest of src */
63 *d
= '\0'; /* NUL-terminate dst */
68 return(s
- src
- 1); /* count does not include NUL */