typedef int (*btr_command_handler)(struct btr_node *btrn,
const char *command, char **result);
-struct btr_node *btr_new_node(char *name, struct btr_node *parent,
+struct btr_node *btr_new_node(const char *name, struct btr_node *parent,
btr_command_handler handler, void *context);
void btr_del_node(struct btr_node *btrn);
void btr_add_output(char *buf, size_t size, struct btr_node *btrn);
void btr_consume(struct btr_node *btrn, size_t numbytes);
int btr_exec(struct btr_node *btrn, const char *command, char **value_result);
int btr_exec_up(struct btr_node *btrn, const char *command, char **value_result);
-int btr_splice_out_node(struct btr_node *btrn);
+void btr_splice_out_node(struct btr_node *btrn);
void btr_pushdown(struct btr_node *btrn);
void *btr_context(struct btr_node *btrn);
+void btr_merge(struct btr_node *btrn, size_t dest_size);
+bool btr_eof(struct btr_node *btrn);