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 _dos_getdiskfree()      Get amount of free space on disk

 #include   <dos.h>

  unsigned     _dos_getdiskfree(drive, diskspace);
  unsigned drive;      0 = default drive, 1 = drive A, 2 = B, etc.
  struct diskfree_t *diskspace; Location of returned disk information

    _dos_getdiskfree() uses MS-DOS function 36h to obtain information
    about the disk drive specified by 'drive'.  The disk information is
    returned in struct diskfree_t, defined in dos.h:

           struct diskfree_t {
              unsigned total_clusters;
              unsigned avail_clusters;
              unsigned sectors_per_cluster;
              unsigned bytes_per_sector;
              }

    Returns:    _dos_getdiskfree() returns 0 if successful, otherwise it
                returns a nonzero value and sets errno to EINVAL to
                indicate that an invalid drive was specified.

   Portability:     MS-DOS only, version 2.0 or higher

------------------------------- Example ---------------------------------

 This program gets and prints the amount of free disk space, in bytes, on
 drive C:

           #include <dos.h>

           main()
           {
              struct diskfree_t diskspace;

              if (_dos_getdiskfree( 3, &diskspace) == 0)
                 {
                 printf("There are %lu bytes available on drive C:\n",
                       (unsigned long) diskspace.avail_clusters *
                       diskspace.sectors_per_cluster *
                       diskspace.bytes_per_sector);
                 }
              else
                 printf("Invalid drive specified\n");
           }