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d42e7319 JB |
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 | ||
19 | #include <sys/types.h> | |
20 | #include <string.h> | |
21 | ||
22 | /* | |
23 | * Copy src to string dst of size siz. At most siz-1 characters | |
24 | * will be copied. Always NUL terminates (unless siz == 0). | |
25 | * Returns strlen(src); if retval >= siz, truncation occurred. | |
26 | */ | |
27 | size_t | |
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) { | |
36 | while (--n != 0) { | |
37 | if ((*d++ = *s++) == '\0') | |
38 | break; | |
39 | } | |
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 | } |