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/***
*fstat64.c - return file status info** Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.**Purpose:* defines _fstat64() - return file status info**Revision History:* 06-02-98 GJF Created.* 11-10-99 GB Made modifications to take care of DST.********************************************************************************/
#include <cruntime.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <msdos.h>
#include <io.h>
#include <internal.h>
#include <stddef.h>
#include <oscalls.h>
#include <stdio.h>
#include <mtdll.h>
#include <time.h>
#define IO_DEVNBR 0x3f
/*
* Number of 100 nanosecond units from 1/1/1601 to 1/1/1970 */#define EPOCH_BIAS 116444736000000000i64
/***
*int _fstat64(fildes, buf) - fills supplied buffer with status info**Purpose:* Fills the supplied buffer with status information on the* file represented by the specified file designator.* WARNING: the dev/rdev fields are zero for files. This is* incompatible with DOS 3 version of this routine.** Note: Unlike fstat, _fstat64 uses the UTC time values returned in the* BY_HANDLE_FILE_INFORMATION struct. This means the time values will* always be correct on NTFS, but may be wrong on FAT file systems for* file times whose DST state is different from the current DST state* (this an NT bug).**Entry:* int fildes - file descriptor* struct _stat64 *buf - buffer to store result in**Exit:* fills in buffer pointed to by buf* returns 0 if successful* returns -1 and sets errno if unsuccessful**Exceptions:********************************************************************************/
int __cdecl _fstat64 ( int fildes, struct __stat64 *buf ){ int isdev; /* 0 for a file, 1 for a device */ int retval = 0; /* assume good return */ BY_HANDLE_FILE_INFORMATION bhfi; FILETIME LocalFTime; SYSTEMTIME SystemTime;
if ( ((unsigned)fildes >= (unsigned)_nhandle) || !(_osfile(fildes) & FOPEN) ) { errno = EBADF; return(-1); }
#ifdef _MT
/* Lock the file */ _lock_fh(fildes); __try { if ( !(_osfile(fildes) & FOPEN) ) { errno = EBADF; retval = -1; goto done; }#endif /* _MT */
/* Find out what kind of handle underlies filedes
*/ isdev = GetFileType((HANDLE)_osfhnd(fildes)) & ~FILE_TYPE_REMOTE;
if ( isdev != FILE_TYPE_DISK ) {
/* not a disk file. probably a device or pipe
*/ if ( (isdev == FILE_TYPE_CHAR) || (isdev == FILE_TYPE_PIPE) ) { /* treat pipes and devices similarly. no further info is
* available from any API, so set the fields as reasonably * as possible and return. */ if ( isdev == FILE_TYPE_CHAR ) buf->st_mode = _S_IFCHR; else buf->st_mode = _S_IFIFO;
buf->st_rdev = buf->st_dev = (_dev_t)fildes; buf->st_nlink = 1; buf->st_uid = buf->st_gid = buf->st_ino = 0; buf->st_atime = buf->st_mtime = buf->st_ctime = 0; if ( isdev == FILE_TYPE_CHAR ) { buf->st_size = 0i64; } else { unsigned long ulAvail; int rc; rc = PeekNamedPipe((HANDLE)_osfhnd(fildes), NULL, 0, NULL, &ulAvail, NULL);
if (rc) { buf->st_size = (_off_t)ulAvail; } else { buf->st_size = (_off_t)0; } }
goto done; } else if ( isdev == FILE_TYPE_UNKNOWN ) { errno = EBADF; retval = -1; goto done; /* join common return code */ } else { /* according to the documentation, this cannot happen, but
* play it safe anyway. */ _dosmaperr(GetLastError()); retval = -1; goto done; } }
/* set the common fields
*/ buf->st_ino = buf->st_uid = buf->st_gid = buf->st_mode = 0; buf->st_nlink = 1;
/* use the file handle to get all the info about the file
*/ if ( !GetFileInformationByHandle((HANDLE)_osfhnd(fildes), &bhfi) ) { _dosmaperr(GetLastError()); retval = -1; goto done; }
if ( bhfi.dwFileAttributes & FILE_ATTRIBUTE_READONLY ) buf->st_mode |= (_S_IREAD + (_S_IREAD >> 3) + (_S_IREAD >> 6)); else buf->st_mode |= ((_S_IREAD|_S_IWRITE) + ((_S_IREAD|_S_IWRITE) >> 3) + ((_S_IREAD|_S_IWRITE) >> 6));
/* set file date fields
*/ if ( !FileTimeToLocalFileTime( &(bhfi.ftLastWriteTime), &LocalFTime ) || !FileTimeToSystemTime( &LocalFTime, &SystemTime ) ) { retval = -1; goto done; }
buf->st_mtime = __loctotime64_t(SystemTime.wYear, SystemTime.wMonth, SystemTime.wDay, SystemTime.wHour, SystemTime.wMinute, SystemTime.wSecond, -1);
if ( bhfi.ftLastAccessTime.dwLowDateTime || bhfi.ftLastAccessTime.dwHighDateTime ) {
if ( !FileTimeToLocalFileTime( &(bhfi.ftLastAccessTime), &LocalFTime ) || !FileTimeToSystemTime( &LocalFTime, &SystemTime ) ) { retval = -1; goto done; }
buf->st_atime = __loctotime64_t(SystemTime.wYear, SystemTime.wMonth, SystemTime.wDay, SystemTime.wHour, SystemTime.wMinute, SystemTime.wSecond, -1); } else buf->st_atime = buf->st_mtime;
if ( bhfi.ftCreationTime.dwLowDateTime || bhfi.ftCreationTime.dwHighDateTime ) {
if ( !FileTimeToLocalFileTime( &(bhfi.ftCreationTime), &LocalFTime ) || !FileTimeToSystemTime( &LocalFTime, &SystemTime ) ) { retval = -1; goto done; }
buf->st_ctime = __loctotime64_t(SystemTime.wYear, SystemTime.wMonth, SystemTime.wDay, SystemTime.wHour, SystemTime.wMinute, SystemTime.wSecond, -1); } else buf->st_ctime = buf->st_mtime;
buf->st_size = ((__int64)(bhfi.nFileSizeHigh)) * (0x100000000i64) + (__int64)(bhfi.nFileSizeLow);
buf->st_mode |= _S_IFREG;
/* On DOS, this field contains the drive number, but
* the drive number is not available on this platform. * Also, for UNC network names, there is no drive number. */ buf->st_rdev = buf->st_dev = 0;
/* Common return code */
done:#ifdef _MT
; } __finally { _unlock_fh(fildes); }#endif /* _MT */
return(retval);}
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