Mercurial > dovecot > original-hg > dovecot-1.2
view src/lib/hash.h @ 1897:1e6ed8045f2b HEAD
Changed hash_foreach() to iterator.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Wed, 03 Dec 2003 02:40:21 +0200 |
parents | 60646878858e |
children | 906b87e236bf |
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#ifndef __HASH_H #define __HASH_H /* Returns hash code. */ typedef unsigned int hash_callback_t(const void *p); /* Returns 0 if the pointers are equal. */ typedef int hash_cmp_callback_t(const void *p1, const void *p2); /* Create a new hash table. If initial_size is 0, the default value is used. If hash_cb or key_compare_cb is NULL, direct hashing/comparing is used. table_pool is used to allocate/free large hash tables, node_pool is used for smaller allocations and can also be alloconly pool. The pools must not be free'd before hash_destroy() is called. */ struct hash_table * hash_create(pool_t table_pool, pool_t node_pool, size_t initial_size, hash_callback_t *hash_cb, hash_cmp_callback_t *key_compare_cb); void hash_destroy(struct hash_table *table); /* Remove all nodes from hash table. If free_collisions is TRUE, the memory allocated from node_pool is freed, or discarded with alloconly pools. */ void hash_clear(struct hash_table *table, int free_collisions); void *hash_lookup(struct hash_table *table, const void *key); int hash_lookup_full(struct hash_table *table, const void *lookup_key, void **orig_key, void **value); /* Insert/update node in hash table. The difference is that hash_insert() replaces the key in table to given one, while hash_update() doesnt. */ void hash_insert(struct hash_table *table, void *key, void *value); void hash_update(struct hash_table *table, void *key, void *value); void hash_remove(struct hash_table *table, const void *key); size_t hash_size(struct hash_table *table); /* Iterates through all nodes in hash table. You may safely call hash_*() functions while iterating, but if you add any new nodes, they may or may not be called for in this iteration. */ struct hash_iterate_context *hash_iterate_init(struct hash_table *table); int hash_iterate(struct hash_iterate_context *ctx, void **key_r, void **value_r); void hash_iterate_deinit(struct hash_iterate_context *ctx); /* Hash table isn't resized, and removed nodes aren't removed from the list while hash table is freezed. Supports nesting. */ void hash_freeze(struct hash_table *table); void hash_thaw(struct hash_table *table); /* hash function for strings */ unsigned int str_hash(const void *p); unsigned int strcase_hash(const void *p); #endif