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896014f4bc
The FSF's address changed, and we had a mixture of comment styles for the GPL file header. (The style with * at the beginning won out with 580 to 141 in existing files.) Note: I've intentionally left intact other "variations" of the copyright header, e.g. whether it says "Zebra", "Quagga", "FRR", or nothing. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/* Hash routine.
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* Copyright (C) 1998 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2, or (at your
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* option) any later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _ZEBRA_HASH_H
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#define _ZEBRA_HASH_H
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#include "memory.h"
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DECLARE_MTYPE(HASH)
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DECLARE_MTYPE(HASH_BACKET)
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/* Default hash table size. */
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#define HASH_INITIAL_SIZE 256 /* initial number of backets. */
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#define HASH_THRESHOLD 10 /* expand when backet. */
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#define HASHWALK_CONTINUE 0
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#define HASHWALK_ABORT -1
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struct hash_backet
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{
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/* Linked list. */
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struct hash_backet *next;
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/* Hash key. */
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unsigned int key;
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/* Data. */
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void *data;
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};
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struct hash
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{
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/* Hash backet. */
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struct hash_backet **index;
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/* Hash table size. Must be power of 2 */
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unsigned int size;
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/* If expansion failed. */
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int no_expand;
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/* Key make function. */
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unsigned int (*hash_key) (void *);
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/* Data compare function. */
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int (*hash_cmp) (const void *, const void *);
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/* Backet alloc. */
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unsigned long count;
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};
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extern struct hash *hash_create (unsigned int (*) (void *),
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int (*) (const void *, const void *));
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extern struct hash *hash_create_size (unsigned int, unsigned int (*) (void *),
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int (*) (const void *, const void *));
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extern void *hash_get (struct hash *, void *, void * (*) (void *));
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extern void *hash_alloc_intern (void *);
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extern void *hash_lookup (struct hash *, void *);
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extern void *hash_release (struct hash *, void *);
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extern void hash_iterate (struct hash *,
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void (*) (struct hash_backet *, void *), void *);
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extern void hash_walk (struct hash *,
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int (*) (struct hash_backet *, void *), void *);
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extern void hash_clean (struct hash *, void (*) (void *));
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extern void hash_free (struct hash *);
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extern unsigned int string_hash_make (const char *);
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#endif /* _ZEBRA_HASH_H */
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