make a fat allocation table for a FUSE in a binary file

void fat_allocate(int file_number, int sectors) {
  int i;
  int current_sector = 0;
  for (i = 0; i < sectors; i++) {
    current_sector = fat_allocate_sector();
    if (current_sector == -1) {
      printf("No more sectors free");
      return;
    }
    fat[file_number][i] = current_sector;
  }
}