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/*
* charybdis: an advanced ircd.
* irc_dictionary.h: Dictionary-based storage.
*
* Copyright (c) 2007 William Pitcock <nenolod -at- sacredspiral.co.uk>
* Copyright (c) 2007 Jilles Tjoelker <jilles -at- stack.nl>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __IRC_DICTIONARY_H__
#define __IRC_DICTIONARY_H__
struct Dictionary; /* defined in src/dictionary.c */
typedef int (*DCF)(const char *a, const char *b);
struct DictionaryElement
{
struct DictionaryElement *left, *right, *prev, *next;
void *data;
const char *key;
int position;
};
struct DictionaryIter
{
struct DictionaryElement *cur, *next;
};
/*
* this is a convenience macro for inlining iteration of dictionaries.
*/
#define DICTIONARY_FOREACH(element, state, dict) for (irc_dictionary_foreach_start((dict), (state)); (element = irc_dictionary_foreach_cur((dict), (state))); irc_dictionary_foreach_next((dict), (state)))
/*
* irc_dictionary_create() creates a new dictionary tree.
* compare_cb is the comparison function, typically strcmp, strcasecmp or
* irccasecmp.
*/
extern struct Dictionary *irc_dictionary_create(DCF compare_cb);
/*
* irc_dictionary_create_named() creates a new dictionary tree which has a name.
* name is the name, compare_cb is the comparator.
*/
extern struct Dictionary *irc_dictionary_create_named(const char *name, DCF compare_cb);
/*
* irc_dictionary_set_comparator_func() resets the comparator used for lookups and
* insertions in the DTree structure.
*/
extern void irc_dictionary_set_comparator_func(struct Dictionary *dict,
DCF compare_cb);
/*
* irc_dictionary_get_comparator_func() returns the comparator used for lookups and
* insertions in the DTree structure.
*/
extern DCF irc_dictionary_get_comparator_func(struct Dictionary *dict);
/*
* irc_dictionary_get_linear_index() returns the linear index of an object in the
* DTree structure.
*/
extern int irc_dictionary_get_linear_index(struct Dictionary *dict, const char *key);
/*
* irc_dictionary_destroy() destroys all entries in a dtree, and also optionally calls
* a defined callback function to destroy any data attached to it.
*/
extern void irc_dictionary_destroy(struct Dictionary *dtree,
void (*destroy_cb)(struct DictionaryElement *delem, void *privdata),
void *privdata);
/*
* irc_dictionary_foreach() iterates all entries in a dtree, and also optionally calls
* a defined callback function to use any data attached to it.
*
* To shortcircuit iteration, return non-zero from the callback function.
*/
extern void irc_dictionary_foreach(struct Dictionary *dtree,
int (*foreach_cb)(struct DictionaryElement *delem, void *privdata),
void *privdata);
/*
* irc_dictionary_search() iterates all entries in a dtree, and also optionally calls
* a defined callback function to use any data attached to it.
*
* When the object is found, a non-NULL is returned from the callback, which results
* in that object being returned to the user.
*/
extern void *irc_dictionary_search(struct Dictionary *dtree,
void *(*foreach_cb)(struct DictionaryElement *delem, void *privdata),
void *privdata);
/*
* irc_dictionary_foreach_start() begins an iteration over all items
* keeping state in the given struct. If there is only one iteration
* in progress at a time, it is permitted to remove the current element
* of the iteration (but not any other element).
*/
extern void irc_dictionary_foreach_start(struct Dictionary *dtree,
struct DictionaryIter *state);
/*
* irc_dictionary_foreach_cur() returns the current element of the iteration,
* or NULL if there are no more elements.
*/
extern void *irc_dictionary_foreach_cur(struct Dictionary *dtree,
struct DictionaryIter *state);
/*
* irc_dictionary_foreach_next() moves to the next element.
*/
extern void irc_dictionary_foreach_next(struct Dictionary *dtree,
struct DictionaryIter *state);
/*
* irc_dictionary_add() adds a key->value entry to the dictionary tree.
*/
extern struct DictionaryElement *irc_dictionary_add(struct Dictionary *dtree, const char *key, void *data);
/*
* irc_dictionary_find() returns a struct DictionaryElement container from a dtree for key 'key'.
*/
extern struct DictionaryElement *irc_dictionary_find(struct Dictionary *dtree, const char *key);
/*
* irc_dictionary_find() returns data from a dtree for key 'key'.
*/
extern void *irc_dictionary_retrieve(struct Dictionary *dtree, const char *key);
/*
* irc_dictionary_delete() deletes a key->value entry from the dictionary tree.
*/
extern void *irc_dictionary_delete(struct Dictionary *dtree, const char *key);
/*
* irc_dictionary_size() returns the number of elements in a dictionary tree.
*/
extern unsigned int irc_dictionary_size(struct Dictionary *dtree);
void irc_dictionary_stats(struct Dictionary *dict, void (*cb)(const char *line, void *privdata), void *privdata);
#endif
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