mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 01:00:07 +00:00
123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/* Copyright (C) 1991-1997,1999,2000,2002,2007 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 <limits.h>
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
#include <dirent.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <assert.h>
|
|
|
|
#include <dirstream.h>
|
|
|
|
#ifndef __READDIR
|
|
# define __READDIR __readdir
|
|
# define __GETDENTS __getdents
|
|
# define DIRENT_TYPE struct dirent
|
|
# define __READDIR_ALIAS
|
|
#endif
|
|
|
|
/* Read a directory entry from DIRP. */
|
|
DIRENT_TYPE *
|
|
__READDIR (DIR *dirp)
|
|
{
|
|
DIRENT_TYPE *dp;
|
|
int saved_errno = errno;
|
|
|
|
#ifndef NOT_IN_libc
|
|
__libc_lock_lock (dirp->lock);
|
|
#endif
|
|
|
|
do
|
|
{
|
|
size_t reclen;
|
|
|
|
if (dirp->offset >= dirp->size)
|
|
{
|
|
/* We've emptied out our buffer. Refill it. */
|
|
|
|
size_t maxread;
|
|
ssize_t bytes;
|
|
|
|
#ifndef _DIRENT_HAVE_D_RECLEN
|
|
/* Fixed-size struct; must read one at a time (see below). */
|
|
maxread = sizeof *dp;
|
|
#else
|
|
maxread = dirp->allocation;
|
|
#endif
|
|
|
|
bytes = __GETDENTS (dirp->fd, dirp->data, maxread);
|
|
if (bytes <= 0)
|
|
{
|
|
/* On some systems getdents fails with ENOENT when the
|
|
open directory has been rmdir'd already. POSIX.1
|
|
requires that we treat this condition like normal EOF. */
|
|
if (bytes < 0 && errno == ENOENT)
|
|
bytes = 0;
|
|
|
|
/* Don't modifiy errno when reaching EOF. */
|
|
if (bytes == 0)
|
|
__set_errno (saved_errno);
|
|
dp = NULL;
|
|
break;
|
|
}
|
|
dirp->size = (size_t) bytes;
|
|
|
|
/* Reset the offset into the buffer. */
|
|
dirp->offset = 0;
|
|
}
|
|
|
|
dp = (DIRENT_TYPE *) &dirp->data[dirp->offset];
|
|
|
|
#ifdef _DIRENT_HAVE_D_RECLEN
|
|
reclen = dp->d_reclen;
|
|
#else
|
|
/* The only version of `struct dirent*' that lacks `d_reclen'
|
|
is fixed-size. */
|
|
assert (sizeof dp->d_name > 1);
|
|
reclen = sizeof *dp;
|
|
/* The name is not terminated if it is the largest possible size.
|
|
Clobber the following byte to ensure proper null termination. We
|
|
read jst one entry at a time above so we know that byte will not
|
|
be used later. */
|
|
dp->d_name[sizeof dp->d_name] = '\0';
|
|
#endif
|
|
|
|
dirp->offset += reclen;
|
|
|
|
#ifdef _DIRENT_HAVE_D_OFF
|
|
dirp->filepos = dp->d_off;
|
|
#else
|
|
dirp->filepos += reclen;
|
|
#endif
|
|
|
|
/* Skip deleted files. */
|
|
} while (dp->d_ino == 0);
|
|
|
|
#ifndef NOT_IN_libc
|
|
__libc_lock_unlock (dirp->lock);
|
|
#endif
|
|
|
|
return dp;
|
|
}
|
|
|
|
#ifdef __READDIR_ALIAS
|
|
weak_alias (__readdir, readdir)
|
|
#endif
|