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/* Convert between the kernel's `struct stat' format, and libc's.
Copyright (C) 1991,1995,1996,1997,2000,2002 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
Modified for uClibc by Erik Andersen <andersen@codepoet.org>
*/
#define _GNU_SOURCE
#define _LARGEFILE64_SOURCE
#include <features.h>
#undef __OPTIMIZE__
/* We absolutely do _NOT_ want interfaces silently
* * * renamed under us or very bad things will happen... */
#ifdef __USE_FILE_OFFSET64
# undef __USE_FILE_OFFSET64
#endif
#include <sys/stat.h>
#include "xstatconv.h"
void __xstat_conv(struct kernel_stat *kbuf, struct stat *buf)
{
/* Convert to current kernel version of `struct stat'. */
buf->st_dev = kbuf->st_dev;
buf->st_ino = kbuf->st_ino;
buf->st_mode = kbuf->st_mode;
buf->st_nlink = kbuf->st_nlink;
buf->st_uid = kbuf->st_uid;
buf->st_gid = kbuf->st_gid;
buf->st_rdev = kbuf->st_rdev;
buf->st_size = kbuf->st_size;
buf->st_blksize = kbuf->st_blksize;
buf->st_blocks = kbuf->st_blocks;
buf->st_atime = kbuf->st_atime;
buf->st_mtime = kbuf->st_mtime;
buf->st_ctime = kbuf->st_ctime;
#ifdef STAT_HAVE_NSEC
buf->st_atime_nsec = kbuf->st_atime_nsec;
buf->st_mtime_nsec = kbuf->st_mtime_nsec;
buf->st_ctime_nsec = kbuf->st_ctime_nsec;
#endif
}
#if defined(__UCLIBC_HAS_LFS__)
/* OK, this is ugly, but not much we can do about it.
*
* The issue at hand is that the kernel introduced an ABI change between
* 2.4 and 2.6 for big endian machines on some architectures in stat64 with
* st_dev and st_rdev fields. Older kernels used 'short' but newer kernels
* use a 'long'. As if that wasn't fun enough, the location of st_blocks and
* its padding have swapped. So, when applicable, we need to detect and shift
* bits around and hope for the best. The kernel at least helps us out a bit
* because it will be sure to zero out all padding fields.
*
* Unimportant Note About Mis-detections:
* - if user is running a 2.4 system with the old ABI and they stat a file on
* a system which major 0 / minor 0. We can ignore this though because the
* kernel has major 0 reserved for non mountable devices (wh00t!)
* - if user is running a 2.6 system with the new ABI and they stat a file on
* a device whose st_dev fills up the lower 6 bytes into the upper 2 bytes
* which overlap. Again we should be able to safely ignore this because
* that means it'd be a pretty big ass (read: uncommon) major/minor combo :).
Old [2.4]:
struct stat64 {
unsigned short st_dev;
unsigned char __pad0[10];
...
unsigned long st_blocks;
unsigned long __pad4;
...
New [2.6]:
struct stat64 {
unsigned long long st_dev;
unsigned char __pad0[4];
...
unsigned long __pad4;
unsigned long st_blocks;
...
* sizeof(unsigned short) = 2
* sizeof(unsigned long long) = 8
*/
#include <endian.h>
#include <sys/utsname.h>
#if BYTE_ORDER == BIG_ENDIAN && \
(defined(__ARMEB__)) /* || defined(__sh__) || defined(__sparc__))*/
# define NEED_ABI_CHECK 1
#else
# define NEED_ABI_CHECK 0
#endif
void __xstat64_conv(struct kernel_stat64 *kbuf, struct stat64 *buf)
{
/* Convert to current kernel version of `struct stat64'. */
#if NEED_ABI_CHECK
if (!kbuf->st_dev.old_abi) {
/* new 2.6 ABI */
buf->st_dev = kbuf->st_dev.new_abi;
buf->st_rdev = kbuf->st_rdev.new_abi;
buf->st_blocks = kbuf->st_blocks;
} else {
/* old 2.4 ABI */
buf->st_dev = kbuf->st_dev.old_abi;
buf->st_rdev = kbuf->st_dev.old_abi;
buf->st_blocks = kbuf->__pad_st_blocks;
}
#else
buf->st_dev = kbuf->st_dev;
buf->st_ino = kbuf->st_ino;
buf->st_rdev = kbuf->st_rdev;
#endif
#ifdef _HAVE_STAT64___ST_INO
buf->__st_ino = kbuf->__st_ino;
#endif
buf->st_mode = kbuf->st_mode;
buf->st_nlink = kbuf->st_nlink;
buf->st_uid = kbuf->st_uid;
buf->st_gid = kbuf->st_gid;
buf->st_size = kbuf->st_size;
buf->st_blksize = kbuf->st_blksize;
buf->st_atime = kbuf->st_atime;
buf->st_mtime = kbuf->st_mtime;
buf->st_ctime = kbuf->st_ctime;
#ifdef STAT_HAVE_NSEC
buf->st_atime_nsec = kbuf->st_atime_nsec;
buf->st_mtime_nsec = kbuf->st_mtime_nsec;
buf->st_ctime_nsec = kbuf->st_ctime_nsec;
#endif
}
#endif
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