First commit, with implementation of tic-tac-toe

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 664 insertions, 0 deletions

diff --git a/tic-tac-toe.c b/tic-tac-toe.c
new file mode 100644
index 0000000..907ff94
--- /dev/null
+++ b/tic-tac-toe.c
@@ -0,0 +1,664 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+USAGE("");
+
+static volatile sig_atomic_t caught_sigterm = 0;
+static volatile sig_atomic_t caught_sigwinch = 1;
+
+static struct termios saved_stty;
+
+static int cpu_begins = 0;
+static int rand_on_first = 0;
+static int level = 5;
+
+
+
+static void
+sigterm(int signo)
+{
+	caught_sigterm = 1;
+	(void) signo;
+}
+
+static void
+sigwinch(int signo)
+{
+	caught_sigwinch = 1;
+	(void) signo;
+}
+
+
+static void
+restore_terminal(void)
+{
+	printf("\033[?25h\n\033[?1049;1003;1006l");
+	fflush(stdout);
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_stty);
+}
+
+
+static void
+get_win_combination(char board[3][3], char marks[3][3])
+{
+	int i;
+	memset(marks, 0, sizeof(char[3][3]));
+	for (i = 0; i < 3; i++) {
+		if (board[i][0] != ' ' && board[i][0] == board[i][1] && board[i][1] == board[i][2])
+			marks[i][0] = marks[i][1] = marks[i][2] = 1;
+		if (board[0][i] != ' ' && board[0][i] == board[1][i] && board[1][i] == board[2][i])
+			marks[0][i] = marks[1][i] = marks[2][i] = 1;
+	}
+	if (board[1][1] != ' ' && board[0][0] == board[1][1] && board[1][1] == board[2][2])
+		marks[0][0] = marks[1][1] = marks[2][2] = 1;
+	if (board[1][1] != ' ' && board[0][2] == board[1][1] && board[1][1] == board[2][0])
+		marks[0][2] = marks[1][1] = marks[2][0] = 1;
+}
+
+
+static void
+get_winner(char board[3][3], char *winnerp)
+{
+	int i;
+	for (i = 0; i < 3; i++) {
+		if (board[i][0] != ' ' && board[i][0] == board[i][1] && board[i][1] == board[i][2]) {
+			*winnerp = board[i][0];
+			return;
+		}
+		if (board[0][i] != ' ' && board[0][i] == board[1][i] && board[1][i] == board[2][i]) {
+			*winnerp = board[0][i];
+			return;
+		}
+	}
+	if (board[1][1] != ' ' && board[0][0] == board[1][1] && board[1][1] == board[2][2]) {
+		*winnerp = board[1][1];
+		return;
+	}
+	if (board[1][1] != ' ' && board[0][2] == board[1][1] && board[1][1] == board[2][0]) {
+		*winnerp = board[1][1];
+		return;
+	}
+	*winnerp = ' ';
+}
+
+
+static int16_t
+cpu_think(char board[3][3], char player, char cpu_player, int empty, int depth, int maximize)
+{
+	int16_t score, choices = 0, best = maximize ? -111 : 111;
+	char winner;
+	int x, y;
+	if (empty == 0)
+		return 0;
+	if (!depth) {
+		for (y = 0; y < 3; y++)
+			for (x = 0; x < 3; x++)
+				if (board[y][x] == ' ')
+					choices |= (int16_t)(1 << (y * 3 + x));
+		return (int16_t)(empty | choices);
+	}
+	for (y = 0; y < 3; y++) {
+		for (x = 0; x < 3; x++) {
+			if (board[y][x] != ' ')
+				continue;
+			board[y][x] = player;
+			get_winner(board, &winner);
+			if (winner == cpu_player) {
+				score = (int16_t)(20 - empty);
+			} else if (winner != ' ') {
+				score = (int16_t)(empty - 20);
+			} else {
+				score = cpu_think(board, player ^ 'X' ^ 'O', cpu_player, empty - 1, depth - 1, maximize ^ 1);
+				score >>= 9;
+			}
+			if (maximize ? (score >= best) : (score <= best)) {
+				if (score != best) {
+					best = score;
+					choices = 0;
+				}
+				choices |= (int16_t)(1 << (y * 3 + x));
+			}
+			board[y][x] = ' ';
+		}
+	}
+	return (int16_t)((best << 9) | choices);
+}
+
+
+static void
+cpu_play(char board[3][3], char player, int empty, int rand_move)
+{
+	int16_t packed_choices = cpu_think(board, player, player, empty, rand_move ? 0 : level, 1);
+	int16_t bit;
+	char choices[9], i;
+	int nchoices = 0, y, x;
+	long int r, mask;
+	for (bit = 1, i = 0; i < 9; i++, bit <<= 1)
+		if (packed_choices & bit)
+			choices[nchoices++] = i;
+	if (nchoices == 0)
+		abort();
+	if (nchoices == 1)
+		r = 0;
+	else {
+		if (nchoices <= 2)
+			mask = 1;
+		else if (nchoices <= 4)
+			mask = 3;
+		else if (nchoices <= 8)
+			mask = 7;
+		else
+			mask = 15;
+		do {
+			r = random() & mask;
+		} while (r >= nchoices);
+	}
+	i = choices[r];
+	y = i / 3;
+	x = i % 3;
+	board[y][x] = player;
+}
+
+
+int
+main(int argc, char *argv[])
+{
+	union libterminput_input input;
+	struct libterminput_state termctx;
+	struct termios stty;
+	struct sigaction sigact;
+	struct winsize winsize = {.ws_col = 80, .ws_row = 24};
+	int r, dualplayer = 0, redraw = 1, left = (winsize.ws_col - ((int)sizeof("> Single player") - 1)) / 2;
+	char board[3][3], marks[3][3], winner, player;
+	const char *highlight;
+	int x, y, empty, rand_move = 0, confline = 0;
+
+	ARGBEGIN {
+	default:
+		usage();
+		break;
+	} ARGEND;
+	if (argc)
+		usage();
+
+	memset(&termctx, 0, sizeof(termctx));
+	memset(&sigact, 0, sizeof(sigact));
+
+	sigact.sa_handler = sigterm;
+	sigaction(SIGTERM, &sigact, NULL);
+	sigaction(SIGQUIT, &sigact, NULL);
+	sigaction(SIGINT, &sigact, NULL);
+
+	sigact.sa_handler = sigwinch;
+	sigaction(SIGWINCH, &sigact, NULL);
+
+	if (tcgetattr(STDIN_FILENO, &stty))
+		eprintf("tcgetattr <stdin>:");
+	saved_stty = stty;
+	stty.c_lflag &= (tcflag_t)~(ECHO | ICANON);
+	if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &stty))
+		eprintf("tcsetattr <stdin> TCSAFLUSH:");
+
+	printf("\033[?1049;1003;1006h\033[?25l");
+
+	libsimple_eprintf_preprint = restore_terminal;
+
+restart:
+	for (;;) {
+		if (caught_sigterm)
+			goto out;
+		if (caught_sigwinch) {
+			if (ioctl(STDOUT_FILENO, (unsigned long)TIOCGWINSZ, &winsize) < 0) {
+				if (errno == EINTR)
+					continue;
+				eprintf("ioctl <stdout> TIOCGWINSZ:");
+			}
+			caught_sigwinch = 0;
+			left = (winsize.ws_col - ((int)sizeof("> Single player") - 1)) / 2;
+			redraw = 1;
+		}
+
+		if (redraw) {
+			printf("\033[H\033[m");
+			for (r = (winsize.ws_row - 2) / 2; r > 0; r--)
+				printf("\033[K\n");
+			printf("%*.s%s %s\033[m\033[K\n", left, "", dualplayer == 0 ? "\033[1;31m>" : " ", "Single player");
+			printf("%*.s%s %s\033[m\033[J",   left, "", dualplayer == 1 ? "\033[1;31m>" : " ", "Dual player");
+			fflush(stdout);
+			redraw = 0;
+		}
+
+		r = libterminput_read(STDIN_FILENO, &input, &termctx);
+		if (r <= 0) {
+			if (r < 0) {
+				if (errno == EINTR)
+					continue;
+				libsimple_eprintf("libterminput_read <stdin>:");
+			}
+			break;
+		}
+
+		if (input.type == LIBTERMINPUT_KEYPRESS) {
+			if (input.keypress.key == LIBTERMINPUT_UP && dualplayer > 0) {
+				dualplayer -= 1;
+				redraw = 1;
+			} else if (input.keypress.key == LIBTERMINPUT_DOWN && dualplayer < 1) {
+				dualplayer += 1;
+				redraw = 1;
+			} else if (input.keypress.key == LIBTERMINPUT_ENTER) {
+				break;
+			} else if (input.keypress.key == LIBTERMINPUT_SYMBOL) {
+				if (!strcmp(input.keypress.symbol, " ")) {
+					break;
+				} else if (!strcmp(input.keypress.symbol, "q") || !strcmp(input.keypress.symbol, "Q")) {
+					goto out;
+				} else if (!strcmp(input.keypress.symbol, "L") && (input.keypress.mods & LIBTERMINPUT_CTRL)) {
+					redraw = 1;
+				}
+			}
+		} else if (input.type == LIBTERMINPUT_MOUSEEVENT &&
+			   input.mouseevent.event == LIBTERMINPUT_PRESS &&
+			   input.mouseevent.button == LIBTERMINPUT_BUTTON1 &&
+			   input.mouseevent.x > (left < 0 ? 0 : (size_t)left) &&
+			   input.mouseevent.x - (left < 0 ? 0 : (size_t)left) <= (int)sizeof("> Single player") - 1) {
+			input.mouseevent.y -= (size_t)((winsize.ws_row < 2 ? 2 : winsize.ws_row) - 2) / 2;
+			switch (input.mouseevent.y) {
+			case 1:
+				dualplayer = 0;
+				goto new_game;
+			case 2:
+				dualplayer = 1;
+				goto new_game;
+			default:
+				break;
+			}
+		}
+	}
+
+new_game:
+	redraw = 1;
+	x = y = 1;
+	player = 'X';
+	empty = 9;
+	winner = ' ';
+	highlight = "\033[1;31m";
+	memset(board, ' ', sizeof(board));
+
+	if (!dualplayer) {
+		left = (winsize.ws_col - ((int)sizeof("> [X] CPU's first move is random") - 1)) / 2;
+		for (;;) {
+			if (caught_sigterm)
+				goto out;
+			if (caught_sigwinch) {
+				if (ioctl(STDOUT_FILENO, (unsigned long)TIOCGWINSZ, &winsize) < 0) {
+					if (errno == EINTR)
+						continue;
+					eprintf("ioctl <stdout> TIOCGWINSZ:");
+				}
+				caught_sigwinch = 0;
+				left = (winsize.ws_col - ((int)sizeof("> [X] CPU's first move is random") - 1)) / 2;
+				redraw = 1;
+			}
+
+			if (redraw) {
+				printf("\033[H\033[m");
+				for (r = (winsize.ws_row - 5) / 2; r > 0; r--)
+					printf("\033[K\n");
+				printf("%*.s%s [%s] CPU begins\033[m\033[K\n", left, "",
+				       confline == 0 ? "\033[1;31m>" : " ", cpu_begins ? "X" : " ");
+				printf("%*.s%s [%s] CPU's first move is random\033[m\033[K\n", left, "",
+				       confline == 1 ? "\033[1;31m>" : " ", rand_on_first ? "X" : " ");
+				printf("%*.s%s Difficulty: %i\033[m\033[K\n", left, "",
+				       confline == 2 ? "\033[1;31m>" : " ", level);
+				printf("%*.s%s [PLAY]\033[m\033[K\n", left, "",
+				       confline == 3 ? "\033[1;31m>" : " ");
+				printf("%*.s%s [back]\033[m\033[J", left, "",
+				       confline == 4 ? "\033[1;31m>" : " ");
+				fflush(stdout);
+				redraw = 0;
+			}
+
+			r = libterminput_read(STDIN_FILENO, &input, &termctx);
+			if (r <= 0) {
+				if (r < 0) {
+					if (errno == EINTR)
+						continue;
+					libsimple_eprintf("libterminput_read <stdin>:");
+				}
+				break;
+			}
+
+			if (input.type == LIBTERMINPUT_KEYPRESS) {
+				if (input.keypress.key == LIBTERMINPUT_UP && confline > 0) {
+					confline -= 1;
+					redraw = 1;
+				} else if (input.keypress.key == LIBTERMINPUT_DOWN && confline < 4) {
+					confline += 1;
+					redraw = 1;
+				} else if (input.keypress.key == LIBTERMINPUT_LEFT && confline == 2 && level > 0) {
+					level -= 1;
+					redraw = 1;
+				} else if (input.keypress.key == LIBTERMINPUT_RIGHT && confline == 2 && level < 9) {
+					level += 1;
+					redraw = 1;
+				} else if (input.keypress.key == LIBTERMINPUT_ENTER) {
+				trigger_conf:
+					if (confline == 0) {
+						cpu_begins ^= 1;
+						redraw = 1;
+					} else if (confline == 1) {
+						rand_on_first ^= 1;
+						redraw = 1;
+					} else if (confline == 3) {
+						break;
+					} else if (confline == 4) {
+						redraw = 1;
+						goto restart;
+					}
+				} else if (input.keypress.key == LIBTERMINPUT_SYMBOL) {
+					if (!strcmp(input.keypress.symbol, " ")) {
+						goto trigger_conf;
+					} else if (!strcmp(input.keypress.symbol, "q") || !strcmp(input.keypress.symbol, "Q")) {
+						goto out;
+					} else if (!strcmp(input.keypress.symbol, "L") && (input.keypress.mods & LIBTERMINPUT_CTRL)) {
+						redraw = 1;
+					}
+				}
+			} else if (input.type == LIBTERMINPUT_MOUSEEVENT &&
+				   input.mouseevent.event == LIBTERMINPUT_PRESS &&
+				   input.mouseevent.x > (left < 0 ? 0 : (size_t)left)) {
+				input.mouseevent.x -= (left < 0 ? 0 : (size_t)left);
+				input.mouseevent.y -= (size_t)((winsize.ws_row < 5 ? 5 : winsize.ws_row) - 5) / 2;
+				if (input.mouseevent.y > 0 && input.mouseevent.y <= 5 &&
+				    input.mouseevent.x <= (int)sizeof("> [X] CPU's first move is random") - 1) {
+					if (input.mouseevent.button == LIBTERMINPUT_BUTTON1 ||
+					    ((int)input.mouseevent.y - 1 == 2 &&
+					     (input.mouseevent.button == LIBTERMINPUT_BUTTON3 ||
+					      input.mouseevent.button == LIBTERMINPUT_XBUTTON1||
+					      input.mouseevent.button == LIBTERMINPUT_XBUTTON2))) {
+						confline = (int)input.mouseevent.y - 1;
+						if (confline != 2)
+							goto trigger_conf;
+						if (input.mouseevent.button == LIBTERMINPUT_BUTTON1 ||
+						    input.mouseevent.button == LIBTERMINPUT_XBUTTON2) {
+							level += 1;
+							level %= 10;
+						} else if (level) {
+							level -= 1;
+						} else {
+							level = 9;
+						}
+						redraw = 1;
+					}
+					
+				}
+			}
+		}
+		left = (winsize.ws_col - ((int)sizeof("| X | X | X |") - 1)) / 2;
+		redraw = 1;
+		rand_move = rand_on_first;
+		if (cpu_begins) {
+			player = 'O';
+			highlight = "\033[1;34m";
+			goto cpu_move;
+		}
+	}
+
+	left = (winsize.ws_col - ((int)sizeof("| X | X | X |") - 1)) / 2;
+
+	for (;;) {
+		if (caught_sigterm)
+			goto out;
+		if (caught_sigwinch) {
+			if (ioctl(STDOUT_FILENO, (unsigned long)TIOCGWINSZ, &winsize) < 0) {
+				if (errno == EINTR)
+					continue;
+				eprintf("ioctl <stdout> TIOCGWINSZ:");
+			}
+			caught_sigwinch = 0;
+			left = (winsize.ws_col - ((int)sizeof("| X | X | X |") - 1)) / 2;
+			redraw = 1;
+		}
+
+		if (redraw) {
+			printf("\033[H\033[m");
+			for (r = (winsize.ws_row - 8) / 2; r > 0; r--)
+				printf("\033[K\n");
+			printf("%*.s%s┌───%s┬%s───%s┬%s───┐%s\033[K\n", left, "",
+			       (y == 0 && x == 0) ? highlight : "",
+			       (y == 0 && x == 1) ? highlight : "",
+			       (y == 0 && x == 0) ? "\033[0m" : "",
+			       (y == 0 && x == 2) ? highlight : "",
+			       (y == 0 && x == 1) ? "\033[0m" : "",
+			       (y == 0 && x == 2) ? "\033[0m" : "");
+			printf("%*.s%s│ %c %s│%s %c %s│%s %c │%s\033[K\n", left, "",
+			       (y == 0 && x == 0) ? highlight : "",
+			       (y == 0 && x == 0 && board[0][0] == ' ') ? '+' : board[0][0],
+			       (y == 0 && x == 1) ? highlight : "",
+			       (y == 0 && x == 0) ? "\033[0m" : "",
+			       (y == 0 && x == 1 && board[0][1] == ' ') ? '+' : board[0][1],
+			       (y == 0 && x == 2) ? highlight : "",
+			       (y == 0 && x == 1) ? "\033[0m" : "",
+			       (y == 0 && x == 2 && board[0][2] == ' ') ? '+' : board[0][2],
+			       (y == 0 && x == 2) ? "\033[0m" : "");
+			printf("%*.s%s├───%s┼%s───%s┼%s───┤%s\033[K\n", left, "",
+			       (y <= 1 && x == 0) ? highlight : "",
+			       (y <= 1 && x == 1) ? highlight : "",
+			       (y <= 1 && x == 0) ? "\033[0m" : "",
+			       (y <= 1 && x == 2) ? highlight : "",
+			       (y <= 1 && x == 1) ? "\033[0m" : "",
+			       (y <= 1 && x == 2) ? "\033[0m" : "");
+			printf("%*.s%s│ %c %s│%s %c %s│%s %c │%s\033[K\n", left, "",
+			       (y == 1 && x == 0) ? highlight : "",
+			       (y == 1 && x == 0 && board[1][0] == ' ') ? '+' : board[1][0],
+			       (y == 1 && x == 1) ? highlight : "",
+			       (y == 1 && x == 0) ? "\033[0m" : "",
+			       (y == 1 && x == 1 && board[1][1] == ' ') ? '+' : board[1][1],
+			       (y == 1 && x == 2) ? highlight : "",
+			       (y == 1 && x == 1) ? "\033[0m" : "",
+			       (y == 1 && x == 2 && board[1][2] == ' ') ? '+' : board[1][2],
+			       (y == 1 && x == 2) ? "\033[0m" : "");
+			printf("%*.s%s├───%s┼%s───%s┼%s───┤%s\033[K\n", left, "",
+			       (y >= 1 && x == 0) ? highlight : "",
+			       (y >= 1 && x == 1) ? highlight : "",
+			       (y >= 1 && x == 0) ? "\033[0m" : "",
+			       (y >= 1 && x == 2) ? highlight : "",
+			       (y >= 1 && x == 1) ? "\033[0m" : "",
+			       (y >= 1 && x == 2) ? "\033[0m" : "");
+			printf("%*.s%s│ %c %s│%s %c %s│%s %c │%s\033[K\n", left, "",
+			       (y == 2 && x == 0) ? highlight : "",
+			       (y == 2 && x == 0 && board[2][0] == ' ') ? '+' : board[2][0],
+			       (y == 2 && x == 1) ? highlight : "",
+			       (y == 2 && x == 0) ? "\033[0m" : "",
+			       (y == 2 && x == 1 && board[2][1] == ' ') ? '+' : board[2][1],
+			       (y == 2 && x == 2) ? highlight : "",
+			       (y == 2 && x == 1) ? "\033[0m" : "",
+			       (y == 2 && x == 2 && board[2][2] == ' ') ? '+' : board[2][2],
+			       (y == 2 && x == 2) ? "\033[0m" : "");
+			printf("%*.s%s└───%s┴%s───%s┴%s───┘%s\033[J", left, "",
+			       (y == 2 && x == 0) ? highlight : "",
+			       (y == 2 && x == 1) ? highlight : "",
+			       (y == 2 && x == 0) ? "\033[0m" : "",
+			       (y == 2 && x == 2) ? highlight : "",
+			       (y == 2 && x == 1) ? "\033[0m" : "",
+			       (y == 2 && x == 2) ? "\033[0m" : "");
+			fflush(stdout);
+			redraw = 0;
+		}
+
+		r = libterminput_read(STDIN_FILENO, &input, &termctx);
+		if (r <= 0) {
+			if (r < 0) {
+				if (errno == EINTR)
+					continue;
+				libsimple_eprintf("libterminput_read <stdin>:");
+			}
+			break;
+		}
+
+		if (input.type == LIBTERMINPUT_KEYPRESS) {
+			if (input.keypress.key == LIBTERMINPUT_UP && y > 0) {
+				y -= 1;
+				redraw = 1;
+			} else if (input.keypress.key == LIBTERMINPUT_DOWN && y < 2) {
+				y += 1;
+				redraw = 1;
+			} else if (input.keypress.key == LIBTERMINPUT_LEFT && x > 0) {
+				x -= 1;
+				redraw = 1;
+			} else if (input.keypress.key == LIBTERMINPUT_RIGHT && x < 2) {
+				x += 1;
+				redraw = 1;
+			} else if (input.keypress.key == LIBTERMINPUT_ENTER) {
+			select:
+				if (board[y][x] == ' ') {
+					board[y][x] = player;
+					redraw = 1;
+					get_winner(board, &winner);
+					empty -= 1;
+					if (!empty || winner != ' ')
+						break;
+					if (!dualplayer) {
+					cpu_move:
+						cpu_play(board, player ^ 'X' ^ 'O', empty, rand_move);
+						rand_move = 0;
+						get_winner(board, &winner);
+						empty -= 1;
+						if (!empty || winner != ' ')
+							break;
+					} else {
+						player ^= 'X' ^ 'O';
+						highlight = player == 'X' ? "\033[1;31m" : "\033[1;34m";
+					}
+				}
+			} else if (input.keypress.key == LIBTERMINPUT_SYMBOL) {
+				if (!strcmp(input.keypress.symbol, " ")) {
+					goto select;
+				} else if (!strcmp(input.keypress.symbol, "q") || !strcmp(input.keypress.symbol, "Q")) {
+					goto out;
+				} else if (!strcmp(input.keypress.symbol, "L") && (input.keypress.mods & LIBTERMINPUT_CTRL)) {
+					redraw = 1;
+				} else if (!strcmp(input.keypress.symbol, "7")) {
+					y = 0, x = 0;
+					goto select;
+				} else if (!strcmp(input.keypress.symbol, "8")) {
+					y = 0, x = 1;
+					goto select;
+				} else if (!strcmp(input.keypress.symbol, "9")) {
+					y = 0, x = 2;
+					goto select;
+				} else if (!strcmp(input.keypress.symbol, "4")) {
+					y = 1, x = 0;
+					goto select;
+				} else if (!strcmp(input.keypress.symbol, "5")) {
+					y = 1, x = 1;
+					goto select;
+				} else if (!strcmp(input.keypress.symbol, "6")) {
+					y = 1, x = 2;
+					goto select;
+				} else if (!strcmp(input.keypress.symbol, "1")) {
+					y = 2, x = 0;
+					goto select;
+				} else if (!strcmp(input.keypress.symbol, "2")) {
+					y = 2, x = 1;
+					goto select;
+				} else if (!strcmp(input.keypress.symbol, "3")) {
+					y = 2, x = 2;
+					goto select;
+				}
+			}
+		} else if (input.type == LIBTERMINPUT_MOUSEEVENT &&
+			   input.mouseevent.event == LIBTERMINPUT_PRESS &&
+			   input.mouseevent.button == LIBTERMINPUT_BUTTON1) {
+			input.mouseevent.x -= (left + 2) < 1 ? 1 : (size_t)(left + 2);
+			input.mouseevent.y -= (size_t)(((winsize.ws_row < 8 ? 8 : winsize.ws_row) - 8) / 2 + 1);
+			if (input.mouseevent.x < 4 * 3 && input.mouseevent.y < 7 &&
+			    (input.mouseevent.x & 3) != 3 && (input.mouseevent.y & 1)) {
+				y = (int)input.mouseevent.y / 2;
+				x = (int)input.mouseevent.x / 4;
+				goto select;
+			}
+		}
+	}
+
+	get_win_combination(board, marks);
+	if (winner == 'X')
+		highlight = "\033[1;31m";
+	else
+		highlight = "\033[1;34m";
+
+	for (;;) {
+		if (caught_sigterm)
+			goto out;
+		if (caught_sigwinch) {
+			if (ioctl(STDOUT_FILENO, (unsigned long)TIOCGWINSZ, &winsize) < 0) {
+				if (errno == EINTR)
+					continue;
+				eprintf("ioctl <stdout> TIOCGWINSZ:");
+			}
+			caught_sigwinch = 0;
+			left = (winsize.ws_col - ((int)sizeof("| X | X | X |") - 1)) / 2;
+			redraw = 1;
+		}
+
+		if (redraw) {
+			printf("\033[H\033[m");
+			for (r = (winsize.ws_row - 8) / 2; r > 0; r--)
+				printf("\033[K\n");
+			printf("%*.s┌───┬───┬───┐\033[K\n", left, "");
+			printf("%*.s│ %s%c%s │ %s%c%s │ %s%c%s │\033[K\n", left, "",
+			       marks[0][0] ? highlight : "", board[0][0], "\033[m",
+			       marks[0][1] ? highlight : "", board[0][1], "\033[m",
+			       marks[0][2] ? highlight : "", board[0][2], "\033[m");
+			printf("%*.s├───┼───┼───┤\033[K\n", left, "");
+			printf("%*.s│ %s%c%s │ %s%c%s │ %s%c%s │\033[K\n", left, "",
+			       marks[1][0] ? highlight : "", board[1][0], "\033[m",
+			       marks[1][1] ? highlight : "", board[1][1], "\033[m",
+			       marks[1][2] ? highlight : "", board[1][2], "\033[m");
+			printf("%*.s├───┼───┼───┤\033[K\n", left, "");
+			printf("%*.s│ %s%c%s │ %s%c%s │ %s%c%s │\033[K\n", left, "",
+			       marks[2][0] ? highlight : "", board[2][0], "\033[m",
+			       marks[2][1] ? highlight : "", board[2][1], "\033[m",
+			       marks[2][2] ? highlight : "", board[2][2], "\033[m");
+			printf("%*.s└───┴───┴───┘\033[K\n", left, "");
+			if (winner == ' ')
+				printf("%*.s\033[1m    Draw!\033[J", left, "");
+			else
+				printf("%*.s\033[1;%sm   %c won!!\033[J", left, "", winner == 'X' ? "31" : "34", winner);
+			fflush(stdout);
+			redraw = 0;
+			redraw = 0;
+		}
+
+		r = libterminput_read(STDIN_FILENO, &input, &termctx);
+		if (r <= 0) {
+			if (r < 0) {
+				if (errno == EINTR)
+					continue;
+				libsimple_eprintf("libterminput_read <stdin>:");
+			}
+			break;
+		}
+
+		if (input.type == LIBTERMINPUT_KEYPRESS) {
+			if (input.keypress.key == LIBTERMINPUT_ENTER) {
+				goto new_game;
+			} else if (input.keypress.key == LIBTERMINPUT_SYMBOL) {
+				if (!strcmp(input.keypress.symbol, " "))
+					goto new_game;
+				else if (!strcmp(input.keypress.symbol, "q") || !strcmp(input.keypress.symbol, "Q"))
+					goto out;
+				else if (!strcmp(input.keypress.symbol, "L") && (input.keypress.mods & LIBTERMINPUT_CTRL))
+					redraw = 1;
+			}
+		} else if (input.type == LIBTERMINPUT_MOUSEEVENT &&
+			   input.mouseevent.event == LIBTERMINPUT_PRESS &&
+			   input.mouseevent.button == LIBTERMINPUT_BUTTON1) {
+			goto new_game;
+		}
+	}
+
+out:
+	restore_terminal();
+	return 0;
+}