minix/lib/libc/compat/sys/compat_getdents.c

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/* $NetBSD: compat_getdents.c,v 1.6 2012/03/13 22:24:48 joerg Exp $ */
/*-
* Copyright (c) 2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: compat_getdents.c,v 1.6 2012/03/13 22:24:48 joerg Exp $");
#endif /* LIBC_SCCS and not lint */
#define __LIBC12_SOURCE__
#include "namespace.h"
#include <sys/types.h>
#include <assert.h>
#include <dirent.h>
#include <stddef.h>
#include <compat/include/dirent.h>
#include <string.h>
/*
* libc12 compatible getdents routine.
*/
int
getdents(int fd, char *buf, size_t nbytes)
{
struct dirent *ndp, *nndp, *endp;
struct dirent12 *odp;
ino_t ino;
int rv;
size_t len;
if ((rv = __getdents30(fd, buf, nbytes)) == -1)
return rv;
odp = (struct dirent12 *)(void *)buf;
ndp = (struct dirent *)(void *)buf;
endp = (struct dirent *)(void *)&buf[rv];
/*
* In-place conversion. This works because odp
* is smaller than ndp, but it has to be done
* in the right sequence.
*/
for (; ndp < endp; ndp = nndp) {
nndp = _DIRENT_NEXT(ndp);
/* XXX: avoid unaligned 64-bit access on sparc64 */
/* XXX: does this work? */
memcpy(&ino, &ndp->d_ino, sizeof(ino_t));
odp->d_ino = (uint32_t)ino;
if (ndp->d_namlen >= sizeof(odp->d_name))
odp->d_namlen = sizeof(odp->d_name) - 1;
else
odp->d_namlen = (u_int8_t)ndp->d_namlen;
odp->d_type = ndp->d_type;
(void)memcpy(odp->d_name, ndp->d_name, (size_t)odp->d_namlen);
odp->d_name[odp->d_namlen] = '\0';
len = _DIRENT_SIZE(odp);
_DIAGASSERT(__type_fit(uint16_t, len));
odp->d_reclen = (uint16_t)len;
odp = _DIRENT_NEXT(odp);
}
ptrdiff_t td = (((char *)(void *)odp) - buf);
_DIAGASSERT(__type_fit(int, td));
return (int)td;
}