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comparison libsci/strlcpy.c @ 33:1d0ddf9e6efd

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misc: general documentation
author David Demelier <markand@malikania.fr>
date Thu, 04 Aug 2022 16:47:10 +0200
parents lib/strlcpy.c@dd078aea5d02
children
comparison
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32:081e1c258e64 33:1d0ddf9e6efd
1 /* $OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $ */
2
3 /*
4 * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
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
21 /*
22 * Copy string src to buffer dst of size dsize. At most dsize-1
23 * chars will be copied. Always NUL terminates (unless dsize == 0).
24 * Returns strlen(src); if retval >= dsize, truncation occurred.
25 */
26 size_t
27 util_strlcpy(char *dst, const char *src, size_t dsize)
28 {
29 const char *osrc = src;
30 size_t nleft = dsize;
31
32 /* Copy as many bytes as will fit. */
33 if (nleft != 0) {
34 while (--nleft != 0) {
35 if ((*dst++ = *src++) == '\0')
36 break;
37 }
38 }
39
40 /* Not enough room in dst, add NUL and traverse rest of src. */
41 if (nleft == 0) {
42 if (dsize != 0)
43 *dst = '\0'; /* NUL-terminate dst */
44 while (*src++)
45 ;
46 }
47
48 return(src - osrc - 1); /* count does not include NUL */
49 }