70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/***
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*drivfree.c - Get the size of a disk
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*
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* Copyright (c) 1991, 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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*
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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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#if !defined(_WIN32_)
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#error ERROR - ONLY WIN32 TARGET SUPPORTED!
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#endif
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unsigned _CALLTYPE1 _getdiskfree(unsigned uDrive, struct _diskfree_t * pdf)
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{
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char szRoot[] = "?:\\";
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char szCur[MAX_PATH];
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if (uDrive == 0) {
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GetCurrentDirectory(MAX_PATH, szCur);
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if ((szCur[0] == '\\') && (szCur[1] == '\\')) {
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return (ERROR_INVALID_PARAMETER);
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}
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szRoot[0] = szCur[0];
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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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szRoot[0] = (char)uDrive + (char)('A' - 1);
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}
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if (!GetDiskFreeSpace(szRoot,
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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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return ((int)GetLastError());
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}
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return (0);
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}
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