size_t btr_get_input_queue_size(struct btr_node *btrn);
size_t btr_get_output_queue_size(struct btr_node *btrn);
bool btr_no_parent(struct btr_node *btrn);
size_t btr_next_buffer(struct btr_node *btrn, char **bufp);
size_t btr_get_input_queue_size(struct btr_node *btrn);
size_t btr_get_output_queue_size(struct btr_node *btrn);
bool btr_no_parent(struct btr_node *btrn);
size_t btr_next_buffer(struct btr_node *btrn, char **bufp);