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/* Hash routine.
Copyright (C) 1998 Kunihiro Ishiguro
This file is part of GNU Zebra.
GNU Zebra 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.
GNU Zebra 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.
You should have received a copy of the GNU General Public License
along with GNU Zebra; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _ZEBRA_HASH_H
#define _ZEBRA_HASH_H
#include "memory.h"
DECLARE_MTYPE(HASH)
DECLARE_MTYPE(HASH_BACKET)
/* Default hash table size. */
#define HASH_INITIAL_SIZE 256 /* initial number of backets. */
#define HASH_THRESHOLD 10 /* expand when backet. */
#define HASHWALK_CONTINUE 0
#define HASHWALK_ABORT -1
struct hash_backet
{
/* Linked list. */
struct hash_backet *next;
/* Hash key. */
unsigned int key;
/* Data. */
void *data;
};
struct hash
{
/* Hash backet. */
struct hash_backet **index;
/* Hash table size. Must be power of 2 */
unsigned int size;
/* If expansion failed. */
int no_expand;
/* Key make function. */
unsigned int (*hash_key) (void *);
/* Data compare function. */
int (*hash_cmp) (const void *, const void *);
/* Backet alloc. */
unsigned long count;
};
extern struct hash *hash_create (unsigned int (*) (void *),
int (*) (const void *, const void *));
extern struct hash *hash_create_size (unsigned int, unsigned int (*) (void *),
int (*) (const void *, const void *));
extern void *hash_get (struct hash *, void *, void * (*) (void *));
extern void *hash_alloc_intern (void *);
extern void *hash_lookup (struct hash *, void *);
extern void *hash_release (struct hash *, void *);
extern void hash_iterate (struct hash *,
void (*) (struct hash_backet *, void *), void *);
extern void hash_walk (struct hash *,
int (*) (struct hash_backet *, void *), void *);
extern void hash_clean (struct hash *, void (*) (void *));
extern void hash_free (struct hash *);
extern unsigned int string_hash_make (const char *);
#endif /* _ZEBRA_HASH_H */
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