ace/ace.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <termios.h>

#define CLEAR_SCREEN() printf("\033[H\033[J")
#define MOVE_CURSOR(x, y) printf("\033[%d;%dH", (x), (y))

typedef struct {
	int value; /* 1 to 13 (Ace to King) */
	int suit; /* 0 to 3 (Hearts, Spades, Diamonds, Clubs) */
} card;

card deal_card(void);
int calculate_score(card hand[], int num_cards);
void display_hand(card hand[], int num_cards, int is_player, int total);

struct termios orig_termios;

int main(void)
{
	srand(time(NULL));

	card player_hand[10], cpu_hand[10];
	int player_num_cards = 0, cpu_num_cards = 0;

	/* Set terminal to return read syscall without enter */
	struct termios new_termios;

	tcgetattr(STDIN_FILENO, &orig_termios);
	new_termios = orig_termios;

	new_termios.c_lflag &= ~(ICANON | ECHO);
	tcsetattr(STDIN_FILENO, TCSANOW, &new_termios);


	for (int i = 0; i < 2; i++) {
		player_hand[player_num_cards++] = deal_card();
		cpu_hand[cpu_num_cards++] = deal_card();
	}

	int player_score;
	int cpu_score;

	while (1) {
		CLEAR_SCREEN();
		MOVE_CURSOR(1, 1);
		printf("You			   Computer\n");


		player_score = calculate_score(player_hand, player_num_cards);
		cpu_score = calculate_score(cpu_hand, cpu_num_cards);

		display_hand(player_hand, player_num_cards, 1, player_score);
		display_hand(cpu_hand, cpu_num_cards, 0, cpu_score);

		/* Check if the player has busted */
		if (player_score > 21) {
			printf("\n\033[31mBust! You lose.\033[m\n");
			break;
		}

		printf("\nHit (h) or stand (s)? ");
		fflush(stdout);

		char action;
		read(STDIN_FILENO, &action, 1);

		if (action == 'h') {
			player_hand[player_num_cards++] = deal_card();
		} else if (action == 's') {
			break;
		}
	}

	/* Computer's turn to deal
	 * Customise here if you want more wins
	 */
	while (cpu_score < 17) {
		cpu_hand[cpu_num_cards++] = deal_card();
		cpu_score = calculate_score(cpu_hand, cpu_num_cards);
	}

	CLEAR_SCREEN();
	MOVE_CURSOR(1, 1);

	player_score = calculate_score(player_hand, player_num_cards);
	cpu_score = calculate_score(cpu_hand, cpu_num_cards);

	/* Determine win or lose */
	if (player_score > 21) {
		printf("\033[31mComputer wins!\033[m\n");
	} else if (cpu_score > 21) {
		printf("\033[32mYou win!\033[m\n");
	} else if (player_score > cpu_score) {
		printf("\033[32mYou win!\033[m\n");
	} else if (player_score < cpu_score) {
		printf("\033[31mComputer wins!\033[m\n");
	} else {
		printf("\033[33mDraw!\033[m\n");
	}

	display_hand(player_hand, player_num_cards, 1, player_score);
	display_hand(cpu_hand, cpu_num_cards, 0, cpu_score);

	printf("\n");
	/* Reset terminal */
	tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
	return 0;
}

card deal_card(void)
{
	card card;
	card.value = rand() % 13 + 1;
	card.suit = rand() % 4;
	return card;
}

int calculate_score(card hand[], int num_cards)
{
	int score = 0, num_aces = 0;

	for (int i = 0; i < num_cards; i++) {
		if (hand[i].value == 1) {
			score += 11;
			num_aces++;
		} else if (hand[i].value > 10) {
			score += 10;
		} else {
			score += hand[i].value;
		}
	}

	while (score > 21 && num_aces > 0) {
		score -= 10;
		num_aces--;
	}

	return score;
}

void display_hand(card hand[], int num_cards, int is_player, int total)
{
	const char *suits[] = {"\033[31m♥\033[m", "\033[34m♠\033[m", "\033[35m♦\033[m", "\033[32m♣\033[m"};

	if (is_player) {
		printf("Cards - ");
	} else {
		/* Alignment */
		MOVE_CURSOR(2, 28);
		printf("Cards - ");
	}

	for (int i = 0; i < num_cards; i++) {
		/* Bold */
		printf("\033[1m");
		switch (hand[i].value) {
			case 1:
				printf("A%s ", suits[hand[i].suit]);
				break;
			case 11:
				printf("J%s ", suits[hand[i].suit]);
				break;
			case 12:
				printf("Q%s ", suits[hand[i].suit]);
				break;
			case 13:
				printf("K%s ", suits[hand[i].suit]);
				break;
			default:
				printf("%d%s ", hand[i].value, suits[hand[i].suit]);
		}
		/* Reset color */
		printf("\033[0m");
	}

	printf("\n");
	if (is_player) {
		printf("Total - ");
	} else {
		MOVE_CURSOR(3, 28);
		printf("Total - ");
	}

	/* Bold and inverted */
	printf("\033[1m\033[47;30m %d \033[0m\n", total); 
}