strlcpy.c revision 1.1
1/*	$NetBSD: strlcpy.c,v 1.1 2005/12/20 19:28:52 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 1.1 2005/12/20 19:28:52 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 */
53size_t
54#ifdef _LIBC
55_strlcpy(dst, src, siz)
56#else
57strlcpy(dst, src, siz)
58#endif
59	char *dst;
60	const char *src;
61	size_t siz;
62{
63	char *d = dst;
64	const char *s = src;
65	size_t n = siz;
66
67	_DIAGASSERT(dst != NULL);
68	_DIAGASSERT(src != NULL);
69
70	/* Copy as many bytes as will fit */
71	if (n != 0 && --n != 0) {
72		do {
73			if ((*d++ = *s++) == 0)
74				break;
75		} while (--n != 0);
76	}
77
78	/* Not enough room in dst, add NUL and traverse rest of src */
79	if (n == 0) {
80		if (siz != 0)
81			*d = '\0';		/* NUL-terminate dst */
82		while (*s++)
83			;
84	}
85
86	return(s - src - 1);	/* count does not include NUL */
87}
88#endif
89