dos.h File Reference

#include <corecrt.h>
#include <io.h>

Include dependency graph for dos.h:

Go to the source code of this file.

Classes
struct	_diskfree_t

Macros
#define	_DISKFREE_T_DEFINED
#define	_A_NORMAL   0x00
#define	_A_RDONLY   0x01
#define	_A_HIDDEN   0x02
#define	_A_SYSTEM   0x04
#define	_A_VOLID   0x08
#define	_A_SUBDIR   0x10
#define	_A_ARCH   0x20
#define	_GETDISKFREE_DEFINED
#define	diskfree_t   _diskfree_t

Functions
_CRTIMP unsigned __cdecl	_getdiskfree (unsigned _Drive, struct _diskfree_t *_DiskFree)

Macro Definition Documentation

_A_ARCH

#define _A_ARCH   0x20

Definition at line 35 of file dos.h.

_A_HIDDEN

#define _A_HIDDEN   0x02

Definition at line 31 of file dos.h.

_A_NORMAL

#define _A_NORMAL   0x00

Definition at line 29 of file dos.h.

_A_RDONLY

#define _A_RDONLY   0x01

Definition at line 30 of file dos.h.

_A_SUBDIR

#define _A_SUBDIR   0x10

Definition at line 34 of file dos.h.

_A_SYSTEM

#define _A_SYSTEM   0x04

Definition at line 32 of file dos.h.

_A_VOLID

#define _A_VOLID   0x08

Definition at line 33 of file dos.h.

_DISKFREE_T_DEFINED

#define _DISKFREE_T_DEFINED

This file has no copyright assigned and is placed in the Public Domain. This file is part of the w64 mingw-runtime package. No warranty is given; refer to the file DISCLAIMER within this package.

Definition at line 19 of file dos.h.

_GETDISKFREE_DEFINED

#define _GETDISKFREE_DEFINED

Definition at line 38 of file dos.h.

diskfree_t

#define diskfree_t   _diskfree_t

Definition at line 48 of file dos.h.

Function Documentation

_getdiskfree()

_CRTIMP unsigned __cdecl _getdiskfree	(	unsigned	_Drive,
		struct _diskfree_t *	_DiskFree
	)

Definition at line 19 of file drivfree.cpp.

{
    _VALIDATE_RETURN(result != nullptr,  EINVAL, ERROR_INVALID_PARAMETER);
    _VALIDATE_RETURN(drive_number <= 26, EINVAL, ERROR_INVALID_PARAMETER);
 
    *result = _diskfree_t();
 
    wchar_t drive_name_buffer[4] = { '_', ':', '\\', '\0' };
 
    wchar_t const* const drive_name = drive_number == 0
        ? nullptr
        : drive_name_buffer;
 
    if (drive_number != 0)
    {
        drive_name_buffer[0] = static_cast<wchar_t>(drive_number) + static_cast<wchar_t>(L'A' - 1);
    }
 
    static_assert(sizeof(result->sectors_per_cluster) == sizeof(DWORD), "Unexpected sizeof long");
 
    if (!GetDiskFreeSpaceW(drive_name,
        reinterpret_cast<LPDWORD>(&result->sectors_per_cluster),
        reinterpret_cast<LPDWORD>(&result->bytes_per_sector),
        reinterpret_cast<LPDWORD>(&result->avail_clusters),
        reinterpret_cast<LPDWORD>(&result->total_clusters)))
    {
        int const os_error = GetLastError();
        errno = __acrt_errno_from_os_error(os_error);
 
        return os_error;
    }
 
    return 0;
}