game-to-game multiplayer

uttt.c

@@ -294,22 +294,22 @@ void ut_local_game(struct ut_state *state) {
 	}
 }
 
-void ut_host_game(struct ut_state *state, int conn, char host_player) {
+void ut_network_game(struct ut_state *state, int conn, FILE* conn_file, char player) {
 	int x, y;
-	printf("You play as %c.\n", host_player);
-	FILE* conn_file = fdopen(conn, "w");
+	printf("You play as %c.\n", player);
 	while (true) {
 		ut_show(state, stdout, false);
 		ut_show_boards(state);
 		ut_show(state, conn_file, true);
-		if (state->player == host_player) {
+		if (state->player == player) {
 			fprintf(conn_file, "| Waiting for game partner ...\n");
 			fflush(conn_file);
 			bool ok = getpos(state, &x, &y);
 			if (!ok) {continue;}
+			fprintf(conn_file, "%d,%d\n", x, y);
 		} else {
 			printf("Waiting for game partner ...\n");
-			fprintf(conn_file, "| Place token %c in position x,y: ", ut_turn(host_player));
+			fprintf(conn_file, "| Place token %c in position x,y: ", ut_turn(player));
 			fflush(conn_file);
 			getpos_net(state, conn, conn_file, &x, &y);
 		}
@@ -366,15 +366,33 @@ int main(int argc, char **argv) {
 			printf("error %d\n", errsv);
 			return 1;
 		}
+		FILE* conn_file = fdopen(conn, "w");
+		// decide X or O
 		int random = open("/dev/urandom", O_RDONLY);
 		int byte;
 		read(random, &byte, 1);
-		//printf("%d\n", byte);
-		char host_player = byte % 2 == 0 ? 'X' : 'O';
-		//printf("%c\n", host_player);
-		ut_host_game(&state, conn, host_player);
+		char player = byte % 2 == 0 ? 'X' : 'O';
+		// tell partner X or O
+		fprintf(conn_file, "%c\n", ut_turn(player));
+		ut_network_game(&state, conn, conn_file, player);
 	} else if (strncmp(argv[1], arg_join, strlen(arg_join)) == 0) {
-		printf("no ;)\n");
+		int sock = socket(AF_INET, SOCK_STREAM, 0);
+		if (sock == -1) {
+			int errsv = errno;
+			printf("error %d\n", errsv);
+			return 1;
+		}
+		const struct sockaddr_in addr = {
+			.sin_family = AF_INET,
+			.sin_port = htons(6669),
+			.sin_addr = { .s_addr = htonl(0x7f000001) },
+		};
+		printf("Connecting to game host at 127.0.0.1:6669 ...\n");
+		connect(sock, (struct sockaddr*)&addr, sizeof(addr));
+		FILE* sock_file = fdopen(sock, "w");
+		char player_buf[2];
+		if (recv(sock, &player_buf, 2, 0) != 2) {return 1;}
+		ut_network_game(&state, sock, sock_file, player_buf[0]);
 	} else {
 		printf("%s\n", argv[1]);
 	}