prefix_node
prefix_compare(struct prefix_node *a, struct prefix_node *b)
struct prefix_node *old;
struct prefix_node *new;
RB_GENERATE(prefix_tree, prefix_node, entry, prefix_compare)
struct prefix_node *node;
RB_ENTRY(prefix_node) entry;
RB_HEAD(prefix_tree, prefix_node);
RB_PROTOTYPE(prefix_tree, prefix_node, entry, prefix_compare);
int prefix_compare(struct prefix_node *, struct prefix_node *);