1 /*
2 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
9 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
11 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 /*
18 * Copy src to string dst of size siz. At most siz-1 characters
19 * will be copied. Always NUL terminates (unless siz == 0).
20 * Returns strlen(src); if retval >= siz, truncation occurred.
21 */
22 #include <string.h>
23
24 size_t
25 strlcpy(char *dst, const char *src, size_t siz);
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 && --n != 0) {
36 do {
37 if ((*d++ = *s++) == 0)
38 break;
39 } while (--n != 0);
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