将std :: map移植到C？

typedef struct {
    int key;
    int value;
} KeyValuePair;

typedef struct Node {
    KeyValuePair data;
    struct Node* next;
} Node;

typedef struct {
    int size;
    Node** buckets;
} HashTable;

HashTable* createHashTable(int size) {
    HashTable* table = (HashTable*)malloc(sizeof(HashTable));
    table->size = size;
    table->buckets = (Node**)calloc(size, sizeof(Node*));
    return table;
}

void insert(HashTable* table, int key, int value) {
    int index = hash(key, table->size);
    Node* newNode = (Node*)malloc(sizeof(Node));
    newNode->data.key = key;
    newNode->data.value = value;
    newNode->next = table->buckets[index];
    table->buckets[index] = newNode;
}

int search(HashTable* table, int key) {
    int index = hash(key, table->size);
    Node* current = table->buckets[index];
    while (current != NULL) {
        if (current->data.key == key) {
            return current->data.value;
        }
        current = current->next;
    }
    return -1;
}

void freeHashTable(HashTable* table) {
    for (int i = 0; i< table->size; i++) {
        Node* current = table->buckets[i];
        while (current != NULL) {
            Node* temp = current;
            current = current->next;
            free(temp);
        }
    }
    free(table->buckets);
    free(table);
}