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Import OpenBSD strlcpy and strlcat
author David Demelier <markand@malikania.fr>
date Fri, 03 Aug 2012 17:50:28 +0200
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156:8c7812fefe0f 157:996337564c4d
1 /*
2 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
3 * Copyright (c) 2012 David Demelier <markand@malikania.fr>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <stddef.h>
19
20 /*
21 * Copy src to string dst of size siz. At most siz-1 characters
22 * will be copied. Always NUL terminates (unless siz == 0).
23 * Returns strlen(src); if retval >= siz, truncation occurred.
24 */
25 size_t
26 strlcpy(char *dst, const char *src, size_t siz)
27 {
28 char *d = dst;
29 const char *s = src;
30 size_t n = siz;
31
32 /* Copy as many bytes as will fit */
33 if (n != 0) {
34 while (--n != 0) {
35 if ((*d++ = *s++) == '\0')
36 break;
37 }
38 }
39
40 /* Not enough room in dst, add NUL and traverse rest of src */
41 if (n == 0) {
42 if (siz != 0)
43 *d = '\0'; /* NUL-terminate dst */
44 while (*s++)
45 ;
46 }
47
48 return(s - src - 1); /* count does not include NUL */
49 }