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 * dollar OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp dollar
28 */
29
30 /*
31 * Copy src to string dst of size siz. At most siz-1 characters
32 * will be copied. Always NUL terminates (unless siz == 0).
33 * Returns strlen(src); if retval >= siz, truncation occurred.
34 */
35 static size_t
strlcpy(dst,src,siz)36 strlcpy(dst, src, siz)
37 char *dst;
38 const char *src;
39 size_t siz;
40 {
41 char *d = dst;
42 const char *s = src;
43 size_t n = siz;
44
45 /* Copy as many bytes as will fit */
46 if (n != 0 && --n != 0) {
47 do {
48 if ((*d++ = *s++) == 0)
49 break;
50 } while (--n != 0);
51 }
52
53 /* Not enough room in dst, add NUL and traverse rest of src */
54 if (n == 0) {
55 if (siz != 0)
56 *d = '\0'; /* NUL-terminate dst */
57 while (*s++)
58 ;
59 }
60
61 return(s - src - 1); /* count does not include NUL */
62 }
63