mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/* Copyright (C) 1993,94,95,96,97,2002 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <dirent.h>
|
|
#include <unistd.h>
|
|
#include <endian.h>
|
|
#include <assert.h>
|
|
|
|
/* Read a directory entry from DIRP. */
|
|
struct dirent *
|
|
__readdir (DIR *dirp)
|
|
{
|
|
struct dirent64 *entry64 = __readdir64 (dirp);
|
|
|
|
if (sizeof (struct dirent64) == sizeof (struct dirent))
|
|
/* We should in fact just be an alias to readdir64 on this machine. */
|
|
return (struct dirent *) entry64;
|
|
|
|
/* These are all compile-time constants. We know that d_ino is the first
|
|
member and that the layout of the following members matches exactly in
|
|
both structures. */
|
|
assert (offsetof (struct dirent, d_ino) == 0);
|
|
assert (offsetof (struct dirent64, d_ino) == 0);
|
|
# define MATCH(memb) \
|
|
assert (offsetof (struct dirent64, memb) - sizeof (entry64->d_ino) \
|
|
== offsetof (struct dirent, memb) - sizeof (ino_t))
|
|
MATCH (d_reclen);
|
|
MATCH (d_type);
|
|
MATCH (d_namlen);
|
|
# undef MATCH
|
|
|
|
if (entry64 == NULL)
|
|
return NULL;
|
|
|
|
struct dirent *const entry = ((void *) (&entry64->d_ino + 1)
|
|
- sizeof entry->d_ino);
|
|
const ino_t d_ino = entry64->d_ino;
|
|
if (d_ino != entry64->d_ino)
|
|
{
|
|
__set_errno (EOVERFLOW);
|
|
return NULL;
|
|
}
|
|
# if BYTE_ORDER != BIG_ENDIAN /* We just skipped over the zero high word. */
|
|
entry->d_ino = d_ino; /* ... or the nonzero low word, swap it. */
|
|
# endif
|
|
entry->d_reclen -= sizeof entry64->d_ino - sizeof entry->d_ino;
|
|
return entry;
|
|
}
|
|
|
|
weak_alias (__readdir, readdir)
|