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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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drivfree.c
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C/C++ Source or Header
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1998-06-17
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2KB
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69 lines
/***
*drivfree.c - Get the size of a disk
*
* Copyright (c) 1991-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* This file has _getdiskfree()
*
*******************************************************************************/
#include <cruntime.h>
#include <direct.h>
#include <oscalls.h>
/***
*int _getdiskfree(drivenum, diskfree) - get size of a specified disk
*
*Purpose:
* Gets the size of the current or specified disk drive
*
*Entry:
* int drivenum - 0 for current drive, or drive 1-26
*
*Exit:
* returns 0 if succeeds
* returns system error code on error.
*
*Exceptions:
*
*******************************************************************************/
#ifndef _WIN32
#error ERROR - ONLY WIN32 TARGET SUPPORTED!
#endif /* _WIN32 */
unsigned __cdecl _getdiskfree (
unsigned uDrive,
struct _diskfree_t * pdf
)
{
char Root[4];
char * pRoot;
if ( uDrive == 0 ) {
pRoot = NULL;
}
else if ( uDrive > 26 ) {
return ( ERROR_INVALID_PARAMETER );
}
else {
pRoot = &Root[0];
Root[0] = (char)uDrive + (char)('A' - 1);
Root[1] = ':';
Root[2] = '\\';
Root[3] = '\0';
}
if ( !GetDiskFreeSpace( pRoot,
(LPDWORD)&(pdf->sectors_per_cluster),
(LPDWORD)&(pdf->bytes_per_sector),
(LPDWORD)&(pdf->avail_clusters),
(LPDWORD)&(pdf->total_clusters)) )
{
return ( (unsigned)GetLastError() );
}
return ( 0 );
}