79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
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/***
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*drivfree.c - Get the size of a disk
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*
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* Copyright (c) 1991-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* This file has _getdiskfree()
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*
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*Revision History:
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* 08-21-91 PHG Module created for Win32
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* 10-24-91 GJF Added LPDWORD casts to make MIPS compiler happy.
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* ASSUMES THAT sizeof(unsigned) == sizeof(DWORD).
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* 04-06-93 SKS Replace _CRTAPI* with _cdecl
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* 01-27-95 GJF Removed explicit handling for case where the default
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* drive is specified and the current directory is a
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* UNC path Also, cleaned up a bit.
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* 01-31-95 GJF Further cleanup, as suggested by Richard Shupak.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <direct.h>
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#include <oscalls.h>
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/***
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*int _getdiskfree(drivenum, diskfree) - get size of a specified disk
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*
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*Purpose:
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* Gets the size of the current or specified disk drive
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*
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*Entry:
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* int drivenum - 0 for current drive, or drive 1-26
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*
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*Exit:
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* returns 0 if succeeds
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* returns system error code on error.
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifndef _WIN32
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#error ERROR - ONLY WIN32 TARGET SUPPORTED!
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#endif
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unsigned __cdecl _getdiskfree (
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unsigned uDrive,
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struct _diskfree_t * pdf
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)
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{
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char Root[4];
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char * pRoot;
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if ( uDrive == 0 ) {
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pRoot = NULL;
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}
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else if ( uDrive > 26 ) {
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return ( ERROR_INVALID_PARAMETER );
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}
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else {
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pRoot = &Root[0];
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Root[0] = (char)uDrive + (char)('A' - 1);
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Root[1] = ':';
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Root[2] = '\\';
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Root[3] = '\0';
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}
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if ( !GetDiskFreeSpace( pRoot,
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(LPDWORD)&(pdf->sectors_per_cluster),
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(LPDWORD)&(pdf->bytes_per_sector),
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(LPDWORD)&(pdf->avail_clusters),
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(LPDWORD)&(pdf->total_clusters)) )
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{
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return ( (unsigned)GetLastError() );
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}
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return ( 0 );
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}
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