#include <stdio.h>  #include <dos.h>  #include <malloc.h>     void main(void)   {     struct fatinfo fat;     long sector, total_sectors;     void *buffer;        getfat(3, &fat);     total_sectors = fat.fi_nclus * fat.fi_sclus;        if ((buffer = malloc(fat.fi_bysec)) == NULL)       printf("Error allocating sector buffer\n");     else       for (sector = 0; sector < total_sectors; sector++)         if (absread(2, 1, sector, buffer) == -1)          {            printf("\n\007Error reading sector %ld press Enter\n",              sector);            getchar();          }         else           printf("Reading sector %ld\r", sector);   }