/* This is the Windows prototype (with C arg types).
 * Only the first two arguments are used in this Unix exercise
 * (the remainder are ignored).
 * As with the Windows version, you must open the file before calling
 * this function, and assign the file descriptor to theDisk->floppyDisk
 */

#include <stdio.h>
#include "disk.h"

int DeviceIoControl( 
  Disk theDisk,			// handle to device of interest 
  int dwIoControlCode,		// control code of operation to perform 
  char *bootRecord,		// pointer to buffer to supply input data 
  int bootRecLen,		// size of input buffer
  char *lpOutBuffer,		// pointer to buffer to receive output data 
  int nOutBufferSize,		// size of output buffer 
  int *lpBytesReturned,	// pointer to variable to receive output byte count 
  void *lpOverlapped	// ptr to overlapped structure for asynchronous op 
) {
	if(dwIoControlCode != 0) return 0;

/* Rely on theDisk-> containing the file/device descriptor */
	lseek(theDisk->floppyDisk, 0, SEEK_SET);
	read(theDisk->floppyDisk, bootRecord, bootRecLen);

/* Read the geometry, storing the result in theDisk */
	theDisk->bytesPerSector = bootRecLen;
	theDisk->sect = bootRecord[0x18] & 0xffff;
	theDisk->head = bootRecord[0x1a] & 0xffff;
	theDisk->track = 80;
	theDisk->size = theDisk->sect * theDisk->track;

	return 1;
}