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128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/*
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hash.h
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hash tables
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Copyright (C) 2000 Bill Currie <bill@taniwha.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifndef __hash_h
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#define __hash_h
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typedef struct hashtab_s hashtab_t;
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/*
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create a new hash table:
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tsize: table size. larger values will give better distribution, but
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use more memory.
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gk: a function that returns a string to be used as the key for
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inserting or finding the element. First parameter is a pointer
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to the element from which to extract the key, the second is
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the user data pointer.
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f: a function to free the element. Only ever called from
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Hash_FlushTable and Hash_DelTable. The first parameter is the
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element to be freed and the second is the user data pointer.
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ud: user data pointer. set to whatever you want, it will be passed
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to the get key and free functions as the second parameter.
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returns a pointer to the hash table (to be passed to the other functions)
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or 0 on error.
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multiple inserions of the same key are fine; later insertions override
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previous ones until the later one is removed (Hash_Del).
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*/
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hashtab_t *Hash_NewTable (int tsize, const char *(*gk)(void*,void*),
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void (*f)(void*,void*), void *ud);
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/*
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change the hash and compare functions used by the Has_*Element functions.
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the default hash function just returns the address of the element, and the
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default compare just compares the addresses. compare is to return 0 for not
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equal and non-0 otherwise.
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gh takes the same parameters as gk above
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cmp is element 1, element 2, userdata
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*/
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void Hash_SetHashCompare (hashtab_t *tab, unsigned long (*gh)(void*,void*),
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int (*cmp)(void*,void*,void*));
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/*
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delete a hash table:
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tab: the table to be deleted
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*/
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void Hash_DelTable (hashtab_t *tab);
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/*
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clean out all the entries from a hash table, starting over again:
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tab: the table to be cleared
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*/
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void Hash_FlushTable (hashtab_t *tab);
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/*
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add an entry to a hash table:
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tab: the table to be added to
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ele: the element to add to the table
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returns 0 for success, -1 for error.
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*/
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int Hash_Add (hashtab_t *tab, void *ele);
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int Hash_AddElement (hashtab_t *tab, void *ele);
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/*
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find an element within a hash table:
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tab: the table to search
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key: the key string identifying the element being searched for
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returns a pointer to the element if found, otherwise 0.
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*/
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void *Hash_Find (hashtab_t *tab, const char *key);
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void *Hash_FindElement (hashtab_t *tab, void *ele);
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/*
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delete an element from a hash table:
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tab: the table to remove the element from
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key: the key string identifying the element to be deleted
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returns a pointer to the element on success, 0 if the element could not
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be found.
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Does /NOT/ call the free element function. That is the caller's
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responsibility.
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*/
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void *Hash_Del (hashtab_t *tab, const char *key);
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void *Hash_DelElement (hashtab_t *tab, void *ele);
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/*
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returh the hash value of a string. this is the same function as used
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internally.
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*/
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unsigned long Hash_String (const char *str);
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/*
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return a list of all elements in the table. it is the caller's
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responsibilty to free() the array. Null terminated.
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*/
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void **Hash_GetList (hashtab_t *tab);
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/*
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dump statistics about the hash table
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*/
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void Hash_Stats (hashtab_t *tab);
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#endif // __hash_h
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