grid_reader_start
void grid_reader_start(struct grid_reader *, struct grid *, u_int, u_int);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_start(&gr, back_s->grid, px, py);