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/*
* Generic hashmap manipulation functions
*
* Originally by Elliot C Back -
* http://elliottback.com/wp/hashmap-implementation-in-c/
*
* Modified by Pete Warden to fix a serious performance problem, support strings
* as keys and removed thread synchronization - http://petewarden.typepad.com
*/
#ifndef __HASHMAP_H__
#define __HASHMAP_H__
#define MAP_MISSING -3 /* No such element */
#define MAP_FULL -2 /* Hashmap is full */
#define MAP_OMEM -1 /* Out of Memory */
#define MAP_OK 0 /* OK */
/*
* any_t is a pointer. This allows you to put arbitrary structures in
* the hashmap.
*/
typedef void *any_t;
/*
* PFany is a pointer to a function that can take two any_t arguments
* and return an integer. Returns status code..
*/
typedef int (*PFany)(any_t, any_t);
/*
* map_t is a pointer to an internally maintained data structure.
* Clients of this package do not need to know how hashmaps are
* represented. They see and manipulate only map_t's.
*/
typedef any_t map_t;
/*
* Return an empty hashmap. Returns NULL if empty.
*/
extern map_t hashmap_new();
/*
* Iteratively call f with argument (item, data) for
* each element data in the hashmap. The function must
* return a map status code. If it returns anything other
* than MAP_OK the traversal is terminated. f must
* not reenter any hashmap functions, or deadlock may arise.
*/
extern int hashmap_iterate(map_t in, PFany f, any_t item);
/*
* Add an element to the hashmap. Return MAP_OK or MAP_OMEM.
*/
extern int hashmap_put(map_t in, char *key, any_t value);
/*
* Get an element from the hashmap. Return MAP_OK or MAP_MISSING.
*/
extern int hashmap_get(map_t in, char *key, any_t *arg);
/*
* Remove an element from the hashmap. Return MAP_OK or MAP_MISSING.
*/
extern int hashmap_remove(map_t in, char *key);
/*
* Get any element. Return MAP_OK or MAP_MISSING.
* remove - should the element be removed from the hashmap
*/
extern int hashmap_get_one(map_t in, any_t *arg, int remove);
/*
* Free the hashmap
*/
extern void hashmap_free(map_t in);
/*
* Get the current size of a hashmap
*/
extern int hashmap_length(map_t in);
#endif
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