1 | /* $NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 christos Exp $ */ |
2 | /* $OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $ */ |
3 | |
4 | /* |
5 | * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> |
6 | * |
7 | * Permission to use, copy, modify, and distribute this software for any |
8 | * purpose with or without fee is hereby granted, provided that the above |
9 | * copyright notice and this permission notice appear in all copies. |
10 | * |
11 | * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL |
12 | * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
13 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE |
14 | * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
16 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
17 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
18 | */ |
19 | |
20 | #if !defined(_KERNEL) && !defined(_STANDALONE) |
21 | #if HAVE_NBTOOL_CONFIG_H |
22 | #include "nbtool_config.h" |
23 | #endif |
24 | |
25 | #include <sys/cdefs.h> |
26 | #if defined(LIBC_SCCS) && !defined(lint) |
27 | __RCSID("$NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 christos Exp $" ); |
28 | #endif /* LIBC_SCCS and not lint */ |
29 | |
30 | #ifdef _LIBC |
31 | #include "namespace.h" |
32 | #endif |
33 | #include <sys/types.h> |
34 | #include <assert.h> |
35 | #include <string.h> |
36 | |
37 | #ifdef _LIBC |
38 | # ifdef __weak_alias |
39 | __weak_alias(strlcpy, _strlcpy) |
40 | # endif |
41 | #endif |
42 | #else |
43 | #include <lib/libkern/libkern.h> |
44 | #endif /* !_KERNEL && !_STANDALONE */ |
45 | |
46 | |
47 | #if !HAVE_STRLCPY |
48 | /* |
49 | * Copy src to string dst of size siz. At most siz-1 characters |
50 | * will be copied. Always NUL terminates (unless siz == 0). |
51 | * Returns strlen(src); if retval >= siz, truncation occurred. |
52 | */ |
53 | size_t |
54 | strlcpy(char *dst, const char *src, size_t siz) |
55 | { |
56 | char *d = dst; |
57 | const char *s = src; |
58 | size_t n = siz; |
59 | |
60 | _DIAGASSERT(dst != NULL); |
61 | _DIAGASSERT(src != NULL); |
62 | |
63 | /* Copy as many bytes as will fit */ |
64 | if (n != 0 && --n != 0) { |
65 | do { |
66 | if ((*d++ = *s++) == 0) |
67 | break; |
68 | } while (--n != 0); |
69 | } |
70 | |
71 | /* Not enough room in dst, add NUL and traverse rest of src */ |
72 | if (n == 0) { |
73 | if (siz != 0) |
74 | *d = '\0'; /* NUL-terminate dst */ |
75 | while (*s++) |
76 | ; |
77 | } |
78 | |
79 | return(s - src - 1); /* count does not include NUL */ |
80 | } |
81 | #endif |
82 | |