/* splay tree implementation */
#ifndef __SPLAY_H__
#define __SPLAY_H__

#include <stdint.h>

#define tree_root_priv(T) ((T)->splay_sentinel.splay_left)
#define tree_null_priv(L) (&(L)->splay_sentinel)
#define TREE_DEPTH_MAX 64

typedef long (*splay_compare_t)(const void*, const void*);

typedef struct __splay_node_t {
  struct __splay_node_t *splay_left;
  struct __splay_node_t *splay_right;
  struct __splay_node_t *splay_parent;
  void *splay_data;
  const void *splay_node_key;
} splay_node_t;

typedef struct __splay_t {
  uint64_t nodecount;
  uint64_t maxcount;
  splay_node_t splay_sentinel;
  splay_compare_t splay_compare;
  void *splay_context;
} splay_t;

int splay_init(splay_t *sp, splay_compare_t cmp_fu);
int splay_insert(splay_t *sp, splay_node_t *node, const void *node_key);
int splay_delete(splay_t *sp, splay_node_t *node);
splay_node_t *splay_lookup(splay_t *sp, const void *key);
splay_node_t *splay_first(splay_t *sp);
splay_node_t *splay_next(splay_t *sp, splay_node_t *curr);

#endif /* __SPLAY_H__*/