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 * $FreeBSD: head/lib/libc/string/strlcpy.c 189133 2009-02-28 05:15:02Z das $
19 */
20
21 #include <sys/types.h>
22 #include <string.h>
23
24 /*
25 * Copy src to string dst of size siz. At most siz-1 characters
26 * will be copied. Always NUL terminates (unless siz == 0).
27 * Returns strlen(src); if retval >= siz, truncation occurred.
28 */
29 size_t
strlcpy(char * __restrict dst,const char * __restrict src,size_t siz)30 strlcpy(char * __restrict dst, const char * __restrict src, size_t siz)
31 {
32 char *d = dst;
33 const char *s = src;
34 size_t n = siz;
35
36 /* Copy as many bytes as will fit */
37 if (n != 0) {
38 while (--n != 0) {
39 if ((*d++ = *s++) == '\0')
40 break;
41 }
42 }
43
44 /* Not enough room in dst, add NUL and traverse rest of src */
45 if (n == 0) {
46 if (siz != 0)
47 *d = '\0'; /* NUL-terminate dst */
48 while (*s++)
49 ;
50 }
51
52 return(s - src - 1); /* count does not include NUL */
53 }
54