forked from Telodendria/Telodendria
Add HashMapFunctionSet() to allow custom hash functions.
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4 changed files with 32 additions and 6 deletions
3
TODO.txt
3
TODO.txt
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@ -23,7 +23,7 @@ Phase 2: Building a foundation
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[x] Implement an array
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[x] Implement a logging facility
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[x] Implement a hash map
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[ ] Allow custom hash functions for each hash map
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[x] Allow custom hash functions for each hash map
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[x] Combine library code files
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[x] Implement configuration file parsing using hash map
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[x] Base64 encoding/decoding with padded/unpadded support
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@ -55,6 +55,7 @@ Phase 2: Building a foundation
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[x] Properly implement the command line options as stated in telodendria(8)
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[ ] Remove "chroot" option, just chroot into the data dir, and make the log
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file live there as well.
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[ ] Allow logging to the syslog
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Phase 3: Welcome to Matrix
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@ -1,4 +1,4 @@
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.Dd $Mdocdate: October 10 2022 $
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.Dd $Mdocdate: October 11 2022 $
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.Dt HASHMAP 3
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.Os Telodendria Project
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.Sh NAME
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@ -12,6 +12,8 @@
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.Fn HashMapFree "HashMap *"
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.Ft void
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.Fn HashMapLoadSet "HashMap *" "float"
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.Ft void
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.Fn HashMapFunctionSet "HashMap *" "unsigned long (*) (const char *)"
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.Ft void *
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.Fn HashMapSet "HashMap *" "char *" "void *"
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.Ft void *
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@ -63,6 +65,14 @@ object is 0.75, which should be good enough for most purposes, but
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if you need finer tuning, feel free to play with the max load with
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this function. The changes take effect on the next insert.
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.Pp
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.Fn HashMapFunctionSet
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allows the given hash map to use a custom hashing function. New hash
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maps have a sane hashing function that should work okay for most use
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cases, but if you have a better hash function, it can be specified with
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this function. Do not change the hash function after keys have been
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added; doing so results in undefined behavior. Only set the hash
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function immediately after constructing a new hash map.
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.Pp
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.Fn HashMapSet
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sets the given string key to the given value. Note neither the key nor the
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value is copied into the hash map's own memory space; only pointers are
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@ -39,6 +39,8 @@ struct HashMap
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size_t capacity;
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HashMapBucket **entries;
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unsigned long (*hashFunc) (const char *);
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float maxLoad;
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size_t iterator;
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};
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@ -60,7 +62,6 @@ HashMapHashKey(const char *key)
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return hash;
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}
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static int
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HashMapGrow(HashMap * map)
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{
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@ -136,6 +137,7 @@ HashMapCreate(void)
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map->count = 0;
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map->capacity = 16;
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map->iterator = 0;
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map->hashFunc = HashMapHashKey;
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map->entries = calloc(map->capacity, sizeof(HashMapBucket *));
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if (!map->entries)
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@ -158,7 +160,7 @@ HashMapDelete(HashMap * map, const char *key)
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return NULL;
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}
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hash = HashMapHashKey(key);
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hash = map->hashFunc(key);
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index = hash % map->capacity;
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for (;;)
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@ -212,7 +214,7 @@ HashMapGet(HashMap * map, const char *key)
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return NULL;
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}
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hash = HashMapHashKey(key);
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hash = map->hashFunc(key);
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index = hash % map->capacity;
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for (;;)
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@ -280,6 +282,16 @@ HashMapMaxLoadSet(HashMap * map, float load)
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map->maxLoad = load;
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}
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void
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HashMapFunctionSet(HashMap * map, unsigned long (*hashFunc) (const char *))
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{
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if (!map || !hashFunc)
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{
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return;
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}
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map->hashFunc = hashFunc;
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}
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void *
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HashMapSet(HashMap * map, char *key, void *value)
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@ -297,7 +309,7 @@ HashMapSet(HashMap * map, char *key, void *value)
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HashMapGrow(map);
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}
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hash = HashMapHashKey(key);
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hash = map->hashFunc(key);
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index = hash % map->capacity;
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for (;;)
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@ -33,6 +33,9 @@ extern HashMap *
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extern void
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HashMapMaxLoadSet(HashMap *, float);
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extern void
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HashMapFunctionSet(HashMap *, unsigned long (*) (const char *));
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extern void *
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HashMapSet(HashMap *, char *, void *);
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