1 /* $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $ */
2
3 /*-
4 * Copyright (c) 1998 Todd C. Miller <[email protected]>
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 "compat.h"
20
21 /*
22 * Copy src to string dst of size siz. At most siz-1 characters
23 * will be copied. Always NUL terminates (unless siz == 0).
24 * Returns strlen(src); if retval >= siz, truncation occurred.
25 */
26 size_t
strlcpy(char * __restrict dst,const char * __restrict src,size_t siz)27 strlcpy(char * __restrict dst, const char * __restrict src, size_t siz)
28 {
29 char *d = dst;
30 const char *s = src;
31 size_t n = siz;
32
33 /* Copy as many bytes as will fit */
34 if (n != 0) {
35 while (--n != 0) {
36 if ((*d++ = *s++) == '\0')
37 break;
38 }
39 }
40
41 /* Not enough room in dst, add NUL and traverse rest of src */
42 if (n == 0) {
43 if (siz != 0)
44 *d = '\0'; /* NUL-terminate dst */
45 while (*s++)
46 ;
47 }
48
49 return(s - src - 1); /* count does not include NUL */
50 }
51