/* $Id: strhash.h,v 1.9 2000/08/02 02:06:40 ishisone Exp $ */
/*
 * Copyright (c) 2000 Japan Network Information Center.  All rights reserved.
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#ifndef MDN_STRHASH_H
#define MDN_STRHASH_H 1

/*
 * String-keyed hash table
 *
 * Just a hash table.  Nothing special.  Number of hash buckets
 * grows automatically.
 */

#include <mdn/result.h>

/*
 * Hash table type, which is opaque.
 */
typedef struct mdn_strhash *mdn_strhash_t;

/*
 * Hash value free proc.
 */
typedef void (*mdn_strhash_freeproc_t)(void *value);

/*
 * Create a hash table.
 *
 * Returns:
 *	mdn_success		-- ok.
 *	mdn_nomemory		-- malloc failed.
 */
extern mdn_result_t
mdn_strhash_create(mdn_strhash_t *hashp);

/*
 * Delete a hash table created by 'mdn_strhash_create'.
 * If 'proc' is not NULL, it is called for each value in the
 * hash to release memory for them.
 */
extern void
mdn_strhash_destroy(mdn_strhash_t hash, mdn_strhash_freeproc_t proc);

/*
 * Register an item to the hash table.  This function makes a
 * private copy of the key string.
 *
 * Returns:
 *	mdn_success		-- ok.
 *	mdn_nomemory		-- malloc failed.
 */
extern mdn_result_t
mdn_strhash_put(mdn_strhash_t hash, const char *key, void *value);

/*
 * Find an item with the specified key.
 *
 * Returns:
 *	mdn_success		-- ok. found.
 *	mdn_noentry		-- not found.
 */
extern mdn_result_t
mdn_strhash_get(mdn_strhash_t hash, const char *key, void **valuep);

/*
 * Check if an item with the specified key exists.
 *
 * Returns:
 *	1			-- yes.
 *	0			-- no.
 */
extern int
mdn_strhash_exists(mdn_strhash_t hash, const char *key);

#endif /* MDN_STRHASH_H */