哈希表的初始化

void HashInit(HashTable* ht, HashFunc func)
{if(ht == NULL){return;}ht -> size = 0;ht -> func = func;size_t i = 0;for(; i < MaxSize; i++){ht -> data[i] = NULL;}
}

哈希表的結點創建

HashElem* CreateHashElemNode(KeyType key, ValueType value)
{HashElem* new_node = (HashElem*)malloc(sizeof(HashElem));new_node -> key = key;new_node -> value = value;new_node -> next = NULL;return new_node;
}void DestroyHashElemNode(HashElem* node)
{if(node == NULL){return;}free(node);
}

哈希表的銷毀

void HashDestroy(HashTable* ht)
{if(ht == NULL){return;}ht -> size = 0;ht -> func = NULL;size_t i = 0;for(; i < MaxSize; i++){HashElem* cur = ht -> data[i];while(cur != NULL){HashElem* next = cur -> next;DestroyHashElemNode(cur);cur = next;}}
}

哈希表的查找

int HashBucketFind(HashElem* node, KeyType key)
{if(node == NULL){return 0;}HashElem* cur = node;while(cur != NULL){if(cur -> key == key){return 1;}cur = cur -> next;}return 0;
}int HashFind(HashTable* ht, KeyType key, ValueType* value)
{if(ht == NULL || value == NULL){return 0;}size_t offset = ht -> func(key);HashElem* cur = ht -> data[offset];while(cur != NULL){if(cur -> key == key){*value = cur -> value;return 1;}cur = cur -> next;}return 0;
}int HashBucketFindEx(HashElem* node, KeyType key, HashElem** cur_node, HashElem** prev_node)
{if(node == NULL){return 0;}if(cur_node == NULL || prev_node == NULL){return 0;}HashElem* cur = node;HashElem* prev = NULL;while(cur != NULL){prev = cur;if(cur -> key == key){break;}cur = cur -> next;}if(cur == NULL){return 0;}*cur_node = cur;*prev_node = prev;return 1;
}

哈希表的插入

void HashInsert(HashTable* ht, KeyType key, ValueType value)
{if(ht == NULL){return;}size_t offset = ht -> func(key);HashElem* new_node = CreateHashElemNode(key, value);int ret = HashBucketFind(ht -> data[offset], key);if(ret == 1){return;}new_node -> next = ht -> data[offset];ht -> data[offset] = new_node;ht -> size++;
}

哈希表的刪除

void HashRemove(HashTable* ht, KeyType key)
{if(ht == NULL){return;}if(ht -> size == 0){return;}size_t offset = ht -> func(key);HashElem* cur = NULL;HashElem* prev = NULL;int ret = HashBucketFindEx(ht -> data[offset], key, &cur, &prev);if(ret == 0){return;//沒有找到}if(prev == NULL){ht -> data[offset] = cur -> next;}else{prev -> next = cur -> next;}DestroyHashElemNode(cur);cur = NULL;ht -> size--;
}