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• Map in C
  
  Map.h
  

#pragma once

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef int BOOL;
#define TRUE 1
#define FALSE 0

typedef struct Map {
	void (*put)(char *key, int value);
	int (*get)(char *key);
	BOOL (*contains)(char *key);
	void (*remove)(char *key);
	void (*clear)();
} Map;

Map *createMap();

/*
// Commented for private using in Map.
// To watch details, watch Map.cpp
void put(char *key, int value);
int get(char *key);
BOOL contains(char *key);
void removePairFromMap(char *key);
void clear();
//*/

#include "Map.h"

typedef struct KeyValuePair {
	char *key;
	int value;
	struct KeyValuePair *next;
} KeyValuePair;

// functions for KeyValuePair List

KeyValuePair *createPair(char *key, int value) {
	KeyValuePair *ret = (KeyValuePair *)malloc(sizeof(KeyValuePair));
	memset(ret, 0, sizeof(KeyValuePair));
	
	ret->key = (char *)malloc(sizeof(char) * (strlen(key) + 1));
	strcpy(ret->key, key);
	ret->value = value;
	
	return ret;
}

void removePair(KeyValuePair **pair) {
	free((*pair)->key);

	free(*pair);

	*pair = NULL;
}

void addPair(KeyValuePair **head, KeyValuePair *keyValuePair) {
	if ( *head == NULL ) {
		*head = keyValuePair;
	} else {
		KeyValuePair *temp = *head;

		while ( temp->next != NULL ) {
			if ( strcmp(temp->key, keyValuePair->key) == 0 ) {
				return;
			}
			temp = temp->next;
		}

		temp->next = keyValuePair;
	}
}

KeyValuePair *getPair(KeyValuePair **head, char *key) {
	if ( *head == NULL ) {
		return NULL;
	} else if ( strcmp((*head)->key, key) == 0 ) {
		KeyValuePair *ret = *head;

		*head = (*head)->next;

		return ret;
	} else {
		KeyValuePair *successor = *head;
		KeyValuePair *ret = (*head)->next;

		while ( ret != NULL ) {
			if ( strcmp(ret->key, key) == 0 ) {
				successor->next = ret->next;
				ret->next = NULL;

				return ret;
			}

			successor = ret;
			ret = ret->next;
		}

		return NULL;
	}
}

BOOL hasKey(KeyValuePair **head, char *key) {
	if ( *head != NULL ) {
		KeyValuePair *temp = *head;

		while ( temp != NULL ) {
			if ( strcmp(temp->key, key) == 0 ) {
				return TRUE;
			}

			temp = temp->next;
		}
	}

	return FALSE;
}

void clearList(KeyValuePair **head) {
	if ( *head == NULL ) {
	} else if ( *head != NULL && (*head)->next == NULL ) {
		removePair(head);
	} else {
		KeyValuePair *successor = *head;
		KeyValuePair *temp = (*head)->next;

		while ( temp != NULL ) {
			removePair(&successor);
			successor = temp;
			temp = temp->next;
		}

		removePair(&successor);
	}

	*head = NULL;
}

KeyValuePair *head = NULL; // Real KeyValuePair List Head.

// functions for Map

void put(char *key, int value) {
	addPair(&head, createPair(key, value));
}

int get(char *key) {
	KeyValuePair *temp = getPair(&head, key);
	
	if ( temp != NULL ) {
		return temp->value;
	}

	return 0;
}

BOOL contains(char *key) {
	return hasKey(&head, key);
}

void removePairFromMap(char *key) {
	getPair(&head, key);
}

void clear() {
	clearList(&head);
}

Map *createMap() {
	Map *ret = (Map *)malloc(sizeof(Map));
	memset(ret, 0, sizeof(Map));

	ret->put = put;
	ret->get = get;
	ret->contains = contains;
	ret->remove = removePairFromMap;
	ret->clear = clear;

	return ret;
}

• main.c
  

#include <assert.h>

#include "Map.h"

int main() {
	Map *map = createMap();

	map->put("a", 10);
	map->put("b", 20);
	map->put("c", 30);
	map->put("d", 40);
	
	assert(map->contains("c") == TRUE);
	assert(map->contains("d") == TRUE);
	assert(map->get("b") == 20);

	map->remove("c");

	assert(map->contains("c") == FALSE);

	map->clear();

	assert(map->contains("a") == FALSE);
	assert(map->contains("b") == FALSE);
	assert(map->contains("c") == FALSE);
	assert(map->contains("d") == FALSE);

	map->put("b", 20);

	map->put("b", 30);

	assert(map->get("b") == 20);

	map->clear();

	return 0;
}

• 형한텐 항상 배울게 많네요. 최근 자바로 짜는 프로그램은 개발방식이 형이 하던거랑 꽤나 비슷해진거 같구요. 다음에 간단한 프로젝트 코드레이스라도 해보면 좋을거 같아요. ㅎㅎ 형, 겸손한것도 좋지만 자랑하는 것도 능력이에요. 형의 능력을 뽐내봐요! ㅎㅎㅎ -김태진