1 /* $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $ */
2
3 /*
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/types.h>
20 #include <string.h>
21
22 /*
23 * Copy src to string dst of size siz. At most siz-1 characters
24 * will be copied. Always NUL terminates (unless siz == 0).
25 * Returns strlen(src); if retval >= siz, truncation occurred.
26 */
27 size_t
strlcpy(char * dst,const char * src,size_t siz)28 strlcpy(char *dst, const char *src, size_t siz)
29 {
30 char *d = dst;
31 const char *s = src;
32 size_t n = siz;
33
34 /* Copy as many bytes as will fit */
35 if (n != 0) {
36 while (--n != 0) {
37 if ((*d++ = *s++) == '\0')
38 break;
39 }
40 }
41
42 /* Not enough room in dst, add NUL and traverse rest of src */
43 if (n == 0) {
44 if (siz != 0)
45 *d = '\0'; /* NUL-terminate dst */
46 while (*s++)
47 ;
48 }
49
50 return(s - src - 1); /* count does not include NUL */
51 }
52