Mercurial > sci
comparison libsci/strlcpy.c @ 33:1d0ddf9e6efd
misc: general documentation
author | David Demelier <markand@malikania.fr> |
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date | Thu, 04 Aug 2022 16:47:10 +0200 |
parents | lib/strlcpy.c@dd078aea5d02 |
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32:081e1c258e64 | 33:1d0ddf9e6efd |
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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 } |