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authorIan Lance Taylor <ian@airs.com>2000-02-22 16:18:13 +0000
committerIan Lance Taylor <ian@airs.com>2000-02-22 16:18:13 +0000
commitcc89ffe60ba6d7f80278431ac8da8385d34c3af7 (patch)
tree8ac5ad59f2c0a9b5dccf45dba87e14c320b67061 /include/hashtab.h
parente2eaf477991014a67bc122c3225f6a3fe6d1a8e6 (diff)
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import libiberty from egcs
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+/* An expandable hash tables datatype.
+ Copyright (C) 1999 Free Software Foundation, Inc.
+ Contributed by Vladimir Makarov (vmakarov@cygnus.com).
+
+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 of the License, 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. */
+
+/* This package implements basic hash table functionality. It is possible
+ to search for an entry, create an entry and destroy an entry.
+
+ Elements in the table are generic pointers.
+
+ The size of the table is not fixed; if the occupancy of the table
+ grows too high the hash table will be expanded.
+
+ The abstract data implementation is based on generalized Algorithm D
+ from Knuth's book "The art of computer programming". Hash table is
+ expanded by creation of new hash table and transferring elements from
+ the old table to the new table. */
+
+#ifndef __HASHTAB_H__
+#define __HASHTAB_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include <ansidecl.h>
+
+/* The hash table element is represented by the following type. */
+
+typedef const void *hash_table_entry_t;
+
+/* Hash tables are of the following type. The structure
+ (implementation) of this type is not needed for using the hash
+ tables. All work with hash table should be executed only through
+ functions mentioned below. */
+
+typedef struct hash_table
+{
+ /* Current size (in entries) of the hash table */
+ size_t size;
+ /* Current number of elements including also deleted elements */
+ size_t number_of_elements;
+ /* Current number of deleted elements in the table */
+ size_t number_of_deleted_elements;
+ /* The following member is used for debugging. Its value is number
+ of all calls of `find_hash_table_entry' for the hash table. */
+ int searches;
+ /* The following member is used for debugging. Its value is number
+ of collisions fixed for time of work with the hash table. */
+ int collisions;
+ /* Pointer to function for evaluation of hash value (any unsigned value).
+ This function has one parameter of type hash_table_entry_t. */
+ unsigned (*hash_function) PARAMS ((hash_table_entry_t));
+ /* Pointer to function for test on equality of hash table elements (two
+ parameter of type hash_table_entry_t. */
+ int (*eq_function) PARAMS ((hash_table_entry_t, hash_table_entry_t));
+ /* Table itself */
+ hash_table_entry_t *entries;
+} *hash_table_t;
+
+
+/* The prototypes of the package functions. */
+
+extern hash_table_t create_hash_table
+ PARAMS ((size_t, unsigned (*) (hash_table_entry_t),
+ int (*) (hash_table_entry_t, hash_table_entry_t)));
+
+extern void delete_hash_table PARAMS ((hash_table_t));
+
+extern void empty_hash_table PARAMS ((hash_table_t));
+
+extern hash_table_entry_t *find_hash_table_entry
+ PARAMS ((hash_table_t, hash_table_entry_t, int));
+
+extern void remove_element_from_hash_table_entry PARAMS ((hash_table_t,
+ hash_table_entry_t));
+
+extern void clear_hash_table_slot PARAMS ((hash_table_t, hash_table_entry_t *));
+
+extern void traverse_hash_table PARAMS ((hash_table_t,
+ int (*) (hash_table_entry_t, void *),
+ void *));
+
+extern size_t hash_table_size PARAMS ((hash_table_t));
+
+extern size_t hash_table_elements_number PARAMS ((hash_table_t));
+
+extern int hash_table_collisions PARAMS ((hash_table_t));
+
+extern int all_hash_table_collisions PARAMS ((void));
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __HASHTAB_H */