git/cbtree.h

/*
 * crit-bit tree implementation, does no allocations internally
 * For more information on crit-bit trees: https://cr.yp.to/critbit.html
 * Based on Adam Langley's adaptation of Dan Bernstein's public domain code
 * git clone https://github.com/agl/critbit.git
 *
 * This is adapted to store arbitrary data (not just NUL-terminated C strings
 * and allocates no memory internally.  The user needs to allocate
 * "struct cb_node" and fill cb_node.k[] with arbitrary match data
 * for memcmp.
 * If "klen" is variable, then it should be embedded into "c_node.k[]"
 * Recursion is bound by the maximum value of "klen" used.
 */
#ifndef CBTREE_H
#define CBTREE_H

struct cb_node;
struct cb_node { … };

struct cb_tree { … };

enum cb_next { … };

#define CBTREE_INIT …

static inline void cb_init(struct cb_tree *t)
{ … }

struct cb_node *cb_lookup(struct cb_tree *, const uint8_t *k, size_t klen);
struct cb_node *cb_insert(struct cb_tree *, struct cb_node *, size_t klen);

cb_iter;

void cb_each(struct cb_tree *, const uint8_t *kpfx, size_t klen,
		cb_iter, void *arg);

#endif /* CBTREE_H */