int bio_flag(const char* format, int row, int col, int* status, int radio){
  int done = 0;
  int key = -1;
  if (status) /* if status is non zero set to 1 */
    *status = !!(*status);
  while(!done) {
    bio_displayflag(format, row, col, *status);
    key = bio_getch();
    if (key > SPACE_KEY && key <= TILDA_KEY) bio_beep(); /* if key is any printable key, beep */
    else if (key >= F1_KEY && key <= F12_KEY) done = 1; /* if any function key is pressed, terminate the function */
    else if (key == SPACE_KEY) {
      if (radio)
        *status = 1;
      else
        *status = !(*status); /* toggle status between 0 and 1 */
      done = 1;
    }
    bio_displayflag(format, row, col, *status);
  }
  return key;
}