1 /* $Id: strlcpy.c,v 1.1 2004/03/31 07:40:49 provos Exp $ */
2 /* $OpenBSD: strlcpy.c,v 1.2 1998/11/06 04:33:16 wvdputte Exp $ */
3
4 /*
5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #if defined(LIBC_SCCS) && !defined(lint)
32 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.2 1998/11/06 04:33:16 wvdputte Exp $";
33 #endif /* LIBC_SCCS and not lint */
34
35 #include <sys/types.h>
36 #include <string.h>
37
38 /*
39 * Copy src to string dst of size siz. At most siz-1 characters
40 * will be copied. Always NUL terminates (unless siz == 0).
41 * Returns strlen(src); if retval >= siz, truncation occurred.
42 */
strlcpy(dst,src,siz)43 size_t strlcpy(dst, src, siz)
44 char *dst;
45 const char *src;
46 size_t siz;
47 {
48 register char *d = dst;
49 register const char *s = src;
50 register size_t n = siz;
51
52 if (n == 0)
53 return(strlen(s));
54 while (*s != '\0') {
55 if (n != 1) {
56 *d++ = *s;
57 n--;
58 }
59 s++;
60 }
61 *d = '\0';
62
63 return(s - src); /* count does not include NUL */
64 }
65