260 lines
8.1 KiB
C
260 lines
8.1 KiB
C
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/***
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*fstat64.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 _fstat64() - return file status info
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*
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*Revision History:
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* 06-02-98 GJF Created.
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* 11-10-99 GB Made modifications to take care of DST.
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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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* Number of 100 nanosecond units from 1/1/1601 to 1/1/1970
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*/
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#define EPOCH_BIAS 116444736000000000i64
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/***
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*int _fstat64(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: Unlike fstat, _fstat64 uses the UTC time values returned in the
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* BY_HANDLE_FILE_INFORMATION struct. This means the time values will
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* always be correct on NTFS, but may be wrong on FAT file systems for
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* file times whose DST state is different from the current DST state
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* (this an NT bug).
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*
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*Entry:
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* int fildes - file descriptor
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* struct _stat64 *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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int __cdecl _fstat64 (
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int fildes,
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struct __stat64 *buf
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)
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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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buf->st_size = 0i64;
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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 = __loctotime64_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 = __loctotime64_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 = __loctotime64_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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buf->st_size = ((__int64)(bhfi.nFileSizeHigh)) * (0x100000000i64) +
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(__int64)(bhfi.nFileSizeLow);
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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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