opkg-lede/libopkg/hash_table.h

/* hash.h - hash tables for opkg

   Steven M. Ayer, Jamey Hicks

   Copyright (C) 2002 Compaq Computer Corporation

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
*/

#ifndef _HASH_TABLE_H_
#define _HASH_TABLE_H_

typedef struct hash_entry hash_entry_t;
typedef struct hash_table hash_table_t;

struct hash_entry {
	char *key;
	void *data;
	struct hash_entry *next;
};

struct hash_table {
	const char *name;
	hash_entry_t *entries;
	unsigned int n_buckets;
	unsigned int n_elements;

	/* useful stats */
	unsigned int n_used_buckets;
	unsigned int n_collisions;
	unsigned int max_bucket_len;
	unsigned int n_hits, n_misses;
};

void hash_table_init(const char *name, hash_table_t * hash, int len);
void hash_table_deinit(hash_table_t * hash);
void hash_print_stats(hash_table_t * hash);
void *hash_table_get(hash_table_t * hash, const char *key);
int hash_table_insert(hash_table_t * hash, const char *key, void *value);
int hash_table_remove(hash_table_t * has, const char *key);
void hash_table_foreach(hash_table_t * hash,
			void (*f) (const char *key, void *entry, void *data),
			void *data);

#endif /* _HASH_TABLE_H_ */