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 <[email protected]>
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 #include <LibConfig.h>
20
21 #if !defined(_KERNEL) && !defined(_STANDALONE)
22 #if HAVE_NBTOOL_CONFIG_H
23 #include "nbtool_config.h"
24 #endif
25
26 #include <sys/cdefs.h>
27 #if defined(LIBC_SCCS) && !defined(lint)
28 __RCSID("$NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 christos Exp $");
29 #endif /* LIBC_SCCS and not lint */
30
31 #ifdef _LIBC
32 #include "namespace.h"
33 #endif
34 #include <sys/types.h>
35 #include <assert.h>
36 #include <string.h>
37
38 #ifdef _LIBC
39 # ifdef __weak_alias
__weak_alias(strlcpy,_strlcpy)40 __weak_alias(strlcpy, _strlcpy)
41 # endif
42 #endif
43 #else
44 #include <lib/libkern/libkern.h>
45 #endif /* !_KERNEL && !_STANDALONE */
46
47
48 #if !HAVE_STRLCPY
49 /*
50 * Copy src to string dst of size siz. At most siz-1 characters
51 * will be copied. Always NUL terminates (unless siz == 0).
52 * Returns strlen(src); if retval >= siz, truncation occurred.
53 */
54 size_t
55 strlcpy(char *dst, const char *src, size_t siz)
56 {
57 char *d = dst;
58 const char *s = src;
59 size_t n = siz;
60
61 _DIAGASSERT(dst != NULL);
62 _DIAGASSERT(src != NULL);
63
64 /* Copy as many bytes as will fit */
65 if (n != 0 && --n != 0) {
66 do {
67 if ((*d++ = *s++) == 0)
68 break;
69 } while (--n != 0);
70 }
71
72 /* Not enough room in dst, add NUL and traverse rest of src */
73 if (n == 0) {
74 if (siz != 0)
75 *d = '\0'; /* NUL-terminate dst */
76 while (*s++)
77 ;
78 }
79
80 return(s - src - 1); /* count does not include NUL */
81 }
82 #endif
83