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/* hash - hashing table processing.
Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
Written by Jim Meyering <meyering@ascend.com>, 1998.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* A generic hash table package. */
/* Make sure USE_OBSTACK is defined to 1 if you want the allocator to use
obstacks instead of malloc, and recompile `hash.c' with same setting. */
#ifndef HASH_H_
# define HASH_H_
# ifndef PARAMS
# if PROTOTYPES || __STDC__
# define PARAMS(Args) Args
# else
# define PARAMS(Args) ()
# endif
# endif
typedef unsigned (*Hash_hasher) PARAMS ((const void *, unsigned));
typedef bool (*Hash_comparator) PARAMS ((const void *, const void *));
typedef void (*Hash_data_freer) PARAMS ((void *));
typedef bool (*Hash_processor) PARAMS ((void *, void *));
struct hash_entry
{
void *data;
struct hash_entry *next;
};
struct hash_tuning
{
/* This structure is mainly used for `hash_initialize', see the block
documentation of `hash_reset_tuning' for more complete comments. */
float shrink_threshold; /* ratio of used buckets to trigger a shrink */
float shrink_factor; /* ratio of new smaller size to original size */
float growth_threshold; /* ratio of used buckets to trigger a growth */
float growth_factor; /* ratio of new bigger size to original size */
bool is_n_buckets; /* if CANDIDATE really means table size */
};
typedef struct hash_tuning Hash_tuning;
struct hash_table;
typedef struct hash_table Hash_table;
/* Information and lookup. */
unsigned hash_get_n_buckets PARAMS ((const Hash_table *));
unsigned hash_get_n_buckets_used PARAMS ((const Hash_table *));
unsigned hash_get_n_entries PARAMS ((const Hash_table *));
unsigned hash_get_max_bucket_length PARAMS ((const Hash_table *));
bool hash_table_ok PARAMS ((const Hash_table *));
void hash_print_statistics PARAMS ((const Hash_table *, FILE *));
void *hash_lookup PARAMS ((const Hash_table *, const void *));
/* Walking. */
void *hash_get_first PARAMS ((const Hash_table *));
void *hash_get_next PARAMS ((const Hash_table *, const void *));
unsigned hash_get_entries PARAMS ((const Hash_table *, void **, unsigned));
unsigned hash_do_for_each PARAMS ((const Hash_table *, Hash_processor, void *));
/* Allocation and clean-up. */
unsigned hash_string PARAMS ((const char *, unsigned));
void hash_reset_tuning PARAMS ((Hash_tuning *));
Hash_table *hash_initialize PARAMS ((unsigned, const Hash_tuning *,
Hash_hasher, Hash_comparator,
Hash_data_freer));
void hash_clear PARAMS ((Hash_table *));
void hash_free PARAMS ((Hash_table *));
/* Insertion and deletion. */
bool hash_rehash PARAMS ((Hash_table *, unsigned));
void *hash_insert PARAMS ((Hash_table *, const void *));
void *hash_delete PARAMS ((Hash_table *, const void *));
#endif
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