1/*	$NetBSD: compat_getdents.c,v 1.5 2012/03/13 21:13:32 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2005 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34__RCSID("$NetBSD: compat_getdents.c,v 1.5 2012/03/13 21:13:32 christos Exp $");
35#endif /* LIBC_SCCS and not lint */
36
37#define __LIBC12_SOURCE__
38
39#include "namespace.h"
40#include <sys/types.h>
41#include <assert.h>
42#include <dirent.h>
43#include <stddef.h>
44#include <compat/include/dirent.h>
45#include <string.h>
46
47/*
48 * libc12 compatible getdents routine.
49 */
50int
51getdents(int fd, char *buf, size_t nbytes)
52{
53	struct dirent *ndp, *nndp, *endp;
54	struct dirent12 *odp;
55	ino_t ino;
56	int rv;
57	size_t len;
58
59	if ((rv = __getdents30(fd, buf, nbytes)) == -1)
60		return rv;
61
62	odp = (struct dirent12 *)(void *)buf;
63	ndp = (struct dirent *)(void *)buf;
64	endp = (struct dirent *)(void *)&buf[rv];
65
66	/*
67	 * In-place conversion. This works because odp
68	 * is smaller than ndp, but it has to be done
69	 * in the right sequence.
70	 */
71	for (; ndp < endp; ndp = nndp) {
72		nndp = _DIRENT_NEXT(ndp);
73		/* XXX: avoid unaligned 64-bit access on sparc64 */
74		/* XXX: does this work? */
75		memcpy(&ino, &ndp->d_ino, sizeof(ino_t));
76		odp->d_ino = (uint32_t)ino;
77		if (ndp->d_namlen >= sizeof(odp->d_name))
78			odp->d_namlen = sizeof(odp->d_name) - 1;
79		else
80			odp->d_namlen = (u_int8_t)ndp->d_namlen;
81		odp->d_type = ndp->d_type;
82		(void)memcpy(odp->d_name, ndp->d_name, (size_t)odp->d_namlen);
83		odp->d_name[odp->d_namlen] = '\0';
84		len = _DIRENT_SIZE(odp);
85		_DIAGASSERT(__type_fit(uint16_t, len));
86		odp->d_reclen = (uint16_t)len;
87		odp = _DIRENT_NEXT(odp);
88	}
89	ptrdiff_t td = (((char *)(void *)odp) - buf);
90	_DIAGASSERT(__type_fit(int, td));
91	return (int)td;
92}
93