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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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _ZEBRA_HASH_H
#define _ZEBRA_HASH_H
#include "memory.h"
#include "frratomic.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 {
/* if this backet is the head of the linked listed, len denotes the
* number of
* elements in the list */
int len;
/* Linked list. */
struct hash_backet *next;
/* Hash key. */
unsigned int key;
/* Data. */
void *data;
};
struct hashstats {
/* number of empty hash buckets */
_Atomic uint_fast32_t empty;
/* sum of squares of bucket length */
_Atomic uint_fast32_t ssq;
};
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;
struct hashstats stats;
/* hash name */
char *name;
};
#define hashcount(X) ((X)->count)
extern struct hash *hash_create(unsigned int (*)(void *),
int (*)(const void *, const void *),
const char *);
extern struct hash *hash_create_size(unsigned int, unsigned int (*)(void *),
int (*)(const void *, const void *),
const char *);
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 *);
extern void hash_cmd_init(void);
#endif /* _ZEBRA_HASH_H */
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