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_STRLCPY
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp $";
38 #endif /* LIBC_SCCS and not lint */
39
40 #include <sys/types.h>
41 #include <string.h>
42
43 /*
44 * Copy src to string dst of size siz. At most siz-1 characters
45 * will be copied. Always NUL terminates (unless siz == 0).
46 * Returns strlen(src); if retval >= siz, truncation occurred.
47 */
strlcpy(char * dst,const char * src,size_t siz)48 size_t strlcpy(char *dst, const char *src, size_t siz)
49 {
50 register char *d = dst;
51 register const char *s = src;
52 register size_t n = siz;
53
54 /* Copy as many bytes as will fit */
55 if (n != 0 && --n != 0) {
56 do {
57 if ((*d++ = *s++) == 0)
58 break;
59 } while (--n != 0);
60 }
61
62 /* Not enough room in dst, add NUL and traverse rest of src */
63 if (n == 0) {
64 if (siz != 0)
65 *d = '\0'; /* NUL-terminate dst */
66 while (*s++)
67 ;
68 }
69
70 return(s - src - 1); /* count does not include NUL */
71 }
72 #endif
73