1 | /* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1998 Todd C. Miller <[email protected]> |
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 | #include "compat.h" |
23 | |
24 | /* |
25 | * Copy src to string dst of size siz. At most siz-1 characters |
26 | * will be copied. Always NUL terminates (unless siz == 0). |
27 | * Returns strlen(src); if retval >= siz, truncation occurred. |
28 | */ |
29 | size_t |
30 | strlcpy(char *dst, const char *src, size_t siz) |
31 | { |
32 | char *d = dst; |
33 | const char *s = src; |
34 | size_t n = siz; |
35 | |
36 | /* Copy as many bytes as will fit */ |
37 | if (n != 0 && --n != 0) { |
38 | do { |
39 | if ((*d++ = *s++) == 0) |
40 | break; |
41 | } while (--n != 0); |
42 | } |
43 | |
44 | /* Not enough room in dst, add NUL and traverse rest of src */ |
45 | if (n == 0) { |
46 | if (siz != 0) |
47 | *d = '\0'; /* NUL-terminate dst */ |
48 | while (*s++) |
49 | ; |
50 | } |
51 | |
52 | return(s - src - 1); /* count does not include NUL */ |
53 | } |
54 | |