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/* fdopendir implementation derived from glibc.
Copyright (C) 2006, 2009 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdbool.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#if _LIBC
# include <dirstream.h>
# include <not-cancel.h>
#else
# if __GNUC__ < 3
# define __builtin_expect(expr, expected_val) expr
# endif
# include "openat.h"
# define stat64 stat
# define dirent64 dirent
# define __fxstat64(V, fd, sb) fstat(fd, sb)
# define __fcntl fcntl
# define __set_errno(Val) do { errno = (Val); } while (0)
# define __libc_lock_init(NAME) ((NAME) = 0, 0)
# define close_not_cancel_no_status(fd) close (fd)
# ifdef __i386__
# define internal_function __attribute ((regparm (3), stdcall))
# else
# define internal_function
# endif
struct __dirstream
{
int fd; /* File descriptor. */
char *data; /* Directory block. */
size_t allocation; /* Space allocated for the block. */
size_t size; /* Total valid data in the block. */
size_t offset; /* Current offset into the block. */
off_t filepos; /* Position of next entry to read. */
int lock;
};
#endif
#undef _STATBUF_ST_BLKSIZE
static DIR *
internal_function
__alloc_dir (int fd, bool close_fd)
{
if (__builtin_expect (__fcntl (fd, F_SETFD, FD_CLOEXEC), 0) < 0)
goto lose;
size_t allocation;
#ifdef _STATBUF_ST_BLKSIZE
if (__builtin_expect ((size_t) statp->st_blksize >= sizeof (struct dirent64),
1))
allocation = statp->st_blksize;
else
#endif
allocation = (BUFSIZ < sizeof (struct dirent64)
? sizeof (struct dirent64) : BUFSIZ);
const int pad = -sizeof (DIR) % __alignof__ (struct dirent64);
DIR *dirp = (DIR *) malloc (sizeof (DIR) + allocation + pad);
if (dirp == NULL)
lose:
{
if (close_fd)
{
int save_errno = errno;
close_not_cancel_no_status (fd);
__set_errno (save_errno);
}
return NULL;
}
memset (dirp, '\0', sizeof (DIR));
dirp->data = (char *) (dirp + 1) + pad;
dirp->allocation = allocation;
dirp->fd = fd;
__libc_lock_init (dirp->lock);
return dirp;
}
DIR *
fdopendir (int fd)
{
#if 0
struct stat64 statbuf;
if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &statbuf), 0) < 0)
return NULL;
if (__builtin_expect (! S_ISDIR (statbuf.st_mode), 0))
{
__set_errno (ENOTDIR);
return NULL;
}
/* Make sure the descriptor allows for reading. */
int flags = __fcntl (fd, F_GETFL);
if (__builtin_expect (flags == -1, 0))
return NULL;
if (__builtin_expect ((flags & O_ACCMODE) == O_WRONLY, 0))
{
__set_errno (EINVAL);
return NULL;
}
#endif
return __alloc_dir (fd, false);
}
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