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                               dos_getdrive

   Usage
   #include <dos.h>
   void dos_getdrive(unsigned *driveptr);

   Description
   This  function obtains the identity of the currently logged drive  and
   stores it in the unsigned integer pointed to by driveptr. The drive is
   reported as a integer number where 0 = a, 1 = b, 2 = c and so on.

   Example
   #include <stdio.h>
   #include <dos.h>

   main()
   {
   unsigned driveno;

        dos_getdrive(&driveno);
        printf("The current drive is %c:",driveno+'a');
   }