Header File 

dos.h 

Category 

Directory Control Routines, Miscellaneous Routines 

Prototype 

void getdfree(unsigned char drive, struct dfree *dtable); 

Description 

Gets disk free space. 

getdfree accepts a drive specifier in drive (0 for default, 1 for A, and so on) and fills the dfree structure pointed to by dtable with disk attributes. 

The dfree structure is defined as follows: 

struct dfree { 

unsigned df_avail; /* available clusters */ 

unsigned df_total; /* total clusters */ 

unsigned df_bsec; /* bytes per sector */ 

unsigned df_sclus; /* sectors per cluster */ 

}; 

Return Value 

getdfree returns no value. In the event of an error, df_sclus in the dfree structure is set to (unsigned) -1. 

Example  

#include <stdio.h>
#include <dos.h>
#include <process.h>
int main(void)
{
  struct dfree free;
  long avail;
  getdfree(0, &free);
  if ( free.df_sclus == -1)
  {
    printf("Error in getdfree() call\n");
    exit(1);
  }
  avail = (long) free.df_avail
        * (long) free.df_bsec
        * (long) free.df_sclus;
  printf("The current drive has %ld bytes available\n", avail);
  return 0;
}

Portability