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331 lines
12 KiB
331 lines
12 KiB
/***
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*fstat.c - return file status info
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines fstat() - return file status info
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*
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*Revision History:
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* 03-??-84 RLB Module created
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* 05-??-84 DCW Added register variables
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* 05-19-86 SKS Ported to OS/2
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* 05-21-87 SKS Cleaned up declarations and include files
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* 11-01-87 JCR Multi-thread support
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 05-25-88 PHG Merged DLL and normal version
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* 10-03-88 GJF Adapted for new DOSCALLS.H, DOSTYPES.H.
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* 10-04-88 JCR 386: Removed 'far' keyword
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* 10-10-88 GJF Made API names match DOSCALLS.H
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* 11-07-88 GJF Cleanup, now specific to 386
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* 04-13-89 JCR New syscall interface
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* 05-23-89 PHG Added mask to ignore network bit when testing handle
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* type
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* 05-25-89 JCR 386 OS/2 calls use '_syscall' calling convention
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* 03-12-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
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* <cruntime.h>, removed #include <register.h> and fixed
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* the copyright. Also, cleaned up the formatting a bit.
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* 04-04-90 GJF Removed #include <dos.h>.
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* 07-24-90 SBM Removed '32' from API names
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* 08-13-90 SBM Compiles cleanly with -W3
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* 09-28-90 GJF New-style function declarator.
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* 12-04-90 SRW Changed to include <oscalls.h> instead of <doscalls.h>
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* 12-06-90 SRW Added _CRUISER_ and _WIN32 conditionals.
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* 01-21-91 GJF ANSI naming.
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* 04-26-91 SRW Implemented fstat for _WIN32_ and removed level 3
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* warnings.
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* 02-13-92 GJF Replaced _nfile by _nhandle for Win32.
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* 05-27-92 SKS File Creation and File Last Access timestamps may be 0
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* on some file systems (e.g. FAT) in which case the
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* File Last Write time should be used instead.
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* 06-04-92 SKS Changed comment that used to say "This is a BUG!"
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* to explain that this value cannot be computed on
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* OS/2 or NT. Only MS-DOS provides this functionality.
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* The drive number is not valid for UNC names.
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* 06-25-92 GJF Use GetFileInformationByHandle API, also cleaned up
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* formatting of Win32 verson [_WIN32_].
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* 08-18-92 SKS Add a call to FileTimeToLocalFileTime
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* as a temporary fix until _dtoxtime takes UTC
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* 08-20-92 GJF Merged two changes above.
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* 12-16-92 GJF Win32 GetFileInformationByHandle API doesn't like
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* device or pipe handles. Use _S_IFIFO for pipes.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 04-06-93 GJF Made computation of file times consistent with _stat().
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* 07-21-93 GJF Converted from using __gmtotime_t to __loctotime_t.
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* This undoes part of the change made on 04-06-92
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* 12-28-94 GJF Added _fstati64.
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* 02-15-95 GJF Appended Mac version of source file (somewhat cleaned
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* up), with appropriate #ifdef-s.
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* 06-11-95 GJF Replaced _osfhnd[] with _osfhnd() (macro referencing
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* field in ioinfo struct).
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* 06-27-95 GJF Added check that the file handle is open.
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* 09-25-95 GJF __loctotime_t now takes a DST flag, pass -1 in this
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* slot to indicate DST is undetermined.
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* 07-08-96 GJF Replaced defined(_WIN32) with !defined(_MAC), and
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* defined(_M_M68K) || defined(_M_MPPC) with
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* defined(_MAC). Removed obsolete REG* macros. Also,
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* detab-ed and cleaned up the format a bit.
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* 12-19-97 GJF Exception-safe locking.
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* 05-17-99 PML Remove all Macintosh support.
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* 10-27-99 GB Remove #inlcude <dostypes.h>
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <msdos.h>
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#include <io.h>
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#include <internal.h>
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#include <stddef.h>
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#include <oscalls.h>
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#include <stdio.h>
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#include <mtdll.h>
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#include <time.h>
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#define IO_DEVNBR 0x3f
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/***
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*int _fstat(fildes, buf) - fills supplied buffer with status info
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*
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*Purpose:
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* Fills the supplied buffer with status information on the
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* file represented by the specified file designator.
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* WARNING: the dev/rdev fields are zero for files. This is
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* incompatible with DOS 3 version of this routine.
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*
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* Note: We cannot directly use the file time stamps returned in the
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* BY_HANDLE_FILE_INFORMATION structure. The values are supposedly in
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* system time and system time is ambiguously defined (it is UTC for
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* Windows NT, local time for Win32S and probably local time for
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* Win32C). Therefore, these values must be converted to local time
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* before than can be used.
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*
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*Entry:
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* int fildes - file descriptor
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* struct stat *buf - buffer to store result in
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*
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*Exit:
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* fills in buffer pointed to by buf
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* returns 0 if successful
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* returns -1 and sets errno if unsuccessful
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifdef _USE_INT64
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int __cdecl _fstati64 (
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int fildes,
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struct _stati64 *buf
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)
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#else /* ndef _USE_INT64 */
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int __cdecl _fstat (
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int fildes,
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struct _stat *buf
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)
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#endif /* _USE_INT64 */
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{
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int isdev; /* 0 for a file, 1 for a device */
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int retval = 0; /* assume good return */
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BY_HANDLE_FILE_INFORMATION bhfi;
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FILETIME LocalFTime;
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SYSTEMTIME SystemTime;
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if ( ((unsigned)fildes >= (unsigned)_nhandle) ||
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!(_osfile(fildes) & FOPEN) )
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{
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errno = EBADF;
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return(-1);
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}
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#ifdef _MT
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/* Lock the file */
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_lock_fh(fildes);
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__try {
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if ( !(_osfile(fildes) & FOPEN) ) {
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errno = EBADF;
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retval = -1;
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goto done;
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}
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#endif /* _MT */
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/* Find out what kind of handle underlies filedes
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*/
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isdev = GetFileType((HANDLE)_osfhnd(fildes)) & ~FILE_TYPE_REMOTE;
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if ( isdev != FILE_TYPE_DISK ) {
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/* not a disk file. probably a device or pipe
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*/
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if ( (isdev == FILE_TYPE_CHAR) || (isdev == FILE_TYPE_PIPE) ) {
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/* treat pipes and devices similarly. no further info is
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* available from any API, so set the fields as reasonably
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* as possible and return.
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*/
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if ( isdev == FILE_TYPE_CHAR )
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buf->st_mode = _S_IFCHR;
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else
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buf->st_mode = _S_IFIFO;
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buf->st_rdev = buf->st_dev = (_dev_t)fildes;
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buf->st_nlink = 1;
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buf->st_uid = buf->st_gid = buf->st_ino = 0;
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buf->st_atime = buf->st_mtime = buf->st_ctime = 0;
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if ( isdev == FILE_TYPE_CHAR ) {
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#ifdef _USE_INT64
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buf->st_size = 0i64;
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#else /* ndef _USE_INT64 */
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buf->st_size = 0;
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#endif /* _USE_INT64 */
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}
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else {
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unsigned long ulAvail;
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int rc;
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rc = PeekNamedPipe((HANDLE)_osfhnd(fildes),
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NULL,
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0,
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NULL,
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&ulAvail,
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NULL);
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if (rc) {
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buf->st_size = (_off_t)ulAvail;
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}
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else {
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buf->st_size = (_off_t)0;
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}
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}
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goto done;
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}
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else if ( isdev == FILE_TYPE_UNKNOWN ) {
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errno = EBADF;
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retval = -1;
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goto done; /* join common return code */
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}
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else {
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/* according to the documentation, this cannot happen, but
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* play it safe anyway.
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*/
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_dosmaperr(GetLastError());
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retval = -1;
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goto done;
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}
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}
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/* set the common fields
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*/
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buf->st_ino = buf->st_uid = buf->st_gid = buf->st_mode = 0;
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buf->st_nlink = 1;
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/* use the file handle to get all the info about the file
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*/
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if ( !GetFileInformationByHandle((HANDLE)_osfhnd(fildes), &bhfi) ) {
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_dosmaperr(GetLastError());
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retval = -1;
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goto done;
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}
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if ( bhfi.dwFileAttributes & FILE_ATTRIBUTE_READONLY )
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buf->st_mode |= (_S_IREAD + (_S_IREAD >> 3) + (_S_IREAD >> 6));
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else
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buf->st_mode |= ((_S_IREAD|_S_IWRITE) + ((_S_IREAD|_S_IWRITE) >> 3)
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+ ((_S_IREAD|_S_IWRITE) >> 6));
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/* set file date fields
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*/
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if ( !FileTimeToLocalFileTime( &(bhfi.ftLastWriteTime), &LocalFTime )
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|| !FileTimeToSystemTime( &LocalFTime, &SystemTime ) )
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{
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retval = -1;
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goto done;
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}
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buf->st_mtime = __loctotime_t(SystemTime.wYear,
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SystemTime.wMonth,
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SystemTime.wDay,
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SystemTime.wHour,
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SystemTime.wMinute,
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SystemTime.wSecond,
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-1);
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if ( bhfi.ftLastAccessTime.dwLowDateTime ||
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bhfi.ftLastAccessTime.dwHighDateTime )
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{
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if ( !FileTimeToLocalFileTime( &(bhfi.ftLastAccessTime),
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&LocalFTime ) ||
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!FileTimeToSystemTime( &LocalFTime, &SystemTime ) )
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{
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retval = -1;
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goto done;
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}
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buf->st_atime = __loctotime_t(SystemTime.wYear,
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SystemTime.wMonth,
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SystemTime.wDay,
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SystemTime.wHour,
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SystemTime.wMinute,
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SystemTime.wSecond,
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-1);
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}
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else
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buf->st_atime = buf->st_mtime;
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if ( bhfi.ftCreationTime.dwLowDateTime ||
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bhfi.ftCreationTime.dwHighDateTime )
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{
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if ( !FileTimeToLocalFileTime( &(bhfi.ftCreationTime),
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&LocalFTime ) ||
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!FileTimeToSystemTime( &LocalFTime, &SystemTime ) )
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{
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retval = -1;
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goto done;
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}
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buf->st_ctime = __loctotime_t(SystemTime.wYear,
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SystemTime.wMonth,
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SystemTime.wDay,
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SystemTime.wHour,
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SystemTime.wMinute,
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SystemTime.wSecond,
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-1);
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}
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else
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buf->st_ctime = buf->st_mtime;
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#ifdef _USE_INT64
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buf->st_size = ((__int64)(bhfi.nFileSizeHigh)) * (0x100000000i64) +
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(__int64)(bhfi.nFileSizeLow);
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#else /* ndef _USE_INT64 */
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buf->st_size = bhfi.nFileSizeLow;
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#endif /* _USE_INT64 */
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buf->st_mode |= _S_IFREG;
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/* On DOS, this field contains the drive number, but
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* the drive number is not available on this platform.
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* Also, for UNC network names, there is no drive number.
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*/
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buf->st_rdev = buf->st_dev = 0;
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/* Common return code */
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done:
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#ifdef _MT
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; }
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__finally {
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_unlock_fh(fildes);
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}
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#endif /* _MT */
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return(retval);
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}
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