82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
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/*
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* Generic hashmap manipulation functions
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*
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* Originally by Elliot C Back - http://elliottback.com/wp/hashmap-implementation-in-c/
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*
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* Modified by Pete Warden to fix a serious performance problem, support strings as keys
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* and removed thread synchronization - http://petewarden.typepad.com
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*/
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#ifndef __HASHMAP_H__
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#define __HASHMAP_H__
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#define MAP_MISSING -3 /* No such element */
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#define MAP_FULL -2 /* Hashmap is full */
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#define MAP_OMEM -1 /* Out of Memory */
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#define MAP_OK 0 /* OK */
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/*
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* any_t is a pointer. This allows you to put arbitrary structures in
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* the hashmap.
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*/
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typedef void *any_t;
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/*
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* PFany is a pointer to a function that can take two any_t arguments
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* and return an integer. Returns status code..
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*/
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typedef int (*PFany)(any_t, any_t);
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/*
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* map_t is a pointer to an internally maintained data structure.
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* Clients of this package do not need to know how hashmaps are
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* represented. They see and manipulate only map_t's.
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*/
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typedef any_t map_t;
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/*
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* Return an empty hashmap. Returns NULL if empty.
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*/
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extern map_t libp2p_hashmap_new();
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/*
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* Iteratively call f with argument (item, data) for
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* each element data in the hashmap. The function must
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* return a map status code. If it returns anything other
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* than MAP_OK the traversal is terminated. f must
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* not reenter any hashmap functions, or deadlock may arise.
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*/
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extern int libp2p_hashmap_iterate(map_t in, PFany f, any_t item);
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/*
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* Add an element to the hashmap. Return MAP_OK or MAP_OMEM.
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*/
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extern int libp2p_hashmap_put(map_t in, char* key, any_t value);
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/*
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* Get an element from the hashmap. Return MAP_OK or MAP_MISSING.
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*/
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extern int libp2p_hashmap_get(map_t in, char* key, any_t *arg);
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/*
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* Remove an element from the hashmap. Return MAP_OK or MAP_MISSING.
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*/
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extern int libp2p_hashmap_remove(map_t in, char* key);
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/*
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* Get any element. Return MAP_OK or MAP_MISSING.
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* remove - should the element be removed from the hashmap
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*/
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extern int libp2p_hashmap_get_one(map_t in, any_t *arg, int remove);
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/*
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* Free the hashmap
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*/
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extern void libp2p_hashmap_free(map_t in);
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/*
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* Get the current size of a hashmap
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*/
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extern int libp2p_hashmap_length(map_t in);
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#endif
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