glow in the dark

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

#define WIDTH 100
#define HEIGHT 50
#define SIZE WIDTH*HEIGHT
#define INIT_SIZE 3

typedef struct bo {
	int pos;
	struct bo *next;
} body;

typedef enum d{up = -50, down = +50, left = -1, right = +1} direction;

typedef enum b{false = 0, true = 1} bool;

void init_map();
void print_map();
void update_map();
void init_snake();
void generate_food();
void move();

int map[SIZE];
body *snake;
int snake_size;
direction dir;
bool status;

int main(void) {

	dir = right;
	status = true;
	init_map();
	init_snake();

	while(status) {
		print_map();
		printf("%d", status);
		update_map();
		_sleep(1);
	}

	return 0;
}

void init_map() {
	// places top and bottom walls
	for(int i = 0; i < WIDTH; i++) {
		map[i] = -1;
		map[i + (SIZE - WIDTH)] = -1;
	}

	// places open space
	for(int i = WIDTH; i < SIZE - WIDTH; i++) {
		map[i] = 0;
	}

	// places left and right walls
	for(int i = 0; i < HEIGHT; i++) {
		map[i * WIDTH] = -1;
		map[(i + 1) * WIDTH - 1] = -1;
	}
}

void print_map() {
	system("cls");
	for(int i = 0; i < SIZE; i++) {
		if(i % WIDTH == 0 && i != 0) {
			printf("\n");
		}

		switch(map[i]) {
			case -2:
				printf("%c", 0245);
				break;
			case -1:
				printf("%c", 987);
				break;
			case 0:
				printf(" ");
				break;
			default:
				printf("O");
				break;
		}
	}
}

void update_map() {
	body *p;
	move();
	int new_pos = snake->pos + dir;

	if(map[new_pos] == -2) { 										// snek ate food
		snake_size++;
		p = (body *) malloc(sizeof(body));
		p->pos = new_pos;
		p->next = snake;
		map[p->pos] = snake_size;
		snake = p;

		generate_food();

	} else if(map[new_pos] == -1 || map[new_pos] > 0) {				// snek is kill
		status = false;

	} else {														// snek is moving
		p = snake;
		for(int i = 0; i < snake_size; i++) {
			printf("%d: %d", p->pos, map[p->pos]);
			map[p->pos]--;
			p->next;
		}
	}
}

void init_snake() {
	int aux = snake_size = INIT_SIZE;
	body *p;
	int pos = (HEIGHT / 2) * WIDTH + WIDTH / 2;						// snek's head is at the central position

	for(int i = snake_size; i > 0; i--) {
		p = (body *) malloc(sizeof(body));
		p->pos = pos;
		pos--;
		snake = p;
		map[p->pos] = aux;
		aux--;
		p = p->next;
	}
}

void generate_food() {

}

void move() {
	if(kbhit()) {
		char c = getch();

		switch(c) {
			case 119:
				if(dir != down)
					dir = up;
				break;
			case 115:
				if(dir != up)
					dir = down;
				break;
			case 97:
				if(dir != right)
					dir = left;
				break;
			case 100:
				if(dir != left)
					dir = right;
				break;
		}

	}
}