1 /* $NetBSD: strlcpy.c,v 1.4 2024/11/01 21:11:37 riastradh 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 1.4 2024/11/01 21:11:37 riastradh 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
__weak_alias(strlcpy,_strlcpy)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 *__restrict dst, const char *__restrict 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