Added stalemate logic

c_projects/tiktaktoe/include/gamelogic.h

@@ -5,8 +5,10 @@
 #include <stdint.h>
 #include <ncurses.h>
 
-#define ROWS 3
-#define COLS 3
+#define N 3
+#define ROWS N
+#define COLS N
+#define DIAGS 2
 #define TOTAL_SQUARES ROWS*COLS
 #define DOF 2
 
@@ -19,6 +21,10 @@ typedef struct position_t{
 	uint8_t col;
 }position_t;
 
+// point tracker. make any of these = N and win
+int8_t pts[ROWS+COLS+DIAGS];
+int round_counter;
+
 position_t cpos;
 squarestate boardstate[ROWS * COLS];
 enum turn currturn;
@@ -26,7 +32,9 @@ enum turn currturn;
 void print_boardstate(){
 	for( int y = 0; y < ROWS; y++ ){
 		for( int x = 0; x < COLS; x++ ){
-			printf("|%d|", boardstate[COLS*y + x]);
+			printf("|%c|",
+				(boardstate[COLS*y + x] == X) ? 'X' :
+					(boardstate[COLS*y + x] == O) ? 'O' : '_');
 		}
 		printf("\n");
 	}
@@ -36,19 +44,46 @@ void init_gamestate(){
 	// init cursor pos to 0,0
 	cpos = (position_t){0,0};
 	currturn = X_TURN;
+	round_counter = 0;
 	
 	for( int i = 0; i < TOTAL_SQUARES; i++ ){
 		boardstate[i] = OPEN;
 	}
 }
 
-void check_game_over(){
-	//TODO: no idea
+int is_game_over(){
+	for (int i = 0; i < ROWS + COLS + DIAGS; i++){
+		if ( pts[i] == N ){
+			printf("X won\n");
+			return 1;
+		}else if ( pts[i] == -N ){
+			printf("O won\n");
+			return 1;
+		}
+	}
+
+	if (round_counter == TOTAL_SQUARES){
+		printf("Stalemate\n");
+			return 1;
+	}
+
+	return 0;
+}
+
+void add_point(){
+	int val = (currturn == X_TURN) ? 1 : -1;
+	pts[cpos.row] += val;
+	pts[ROWS + cpos.col] += val;
+	if ( cpos.row == cpos.col){
+		pts[ROWS + COLS + 0] += val;
+	}
+	if( (cpos.row + cpos.col) == (N - 1)){
+		pts[ROWS + COLS + 1] += val;
+	}
 }
 
 void update_boardstate(){
 	int idx = COLS * cpos.row + cpos.col;
-	printf("%d\n", idx);
 	if(boardstate[idx] == OPEN){
 		if(currturn == X_TURN){
 			boardstate[idx] = X;
@@ -56,9 +91,11 @@ void update_boardstate(){
 		else if(currturn == O_TURN){
 			boardstate[idx] = O;
 		}
+		add_point();
+		round_counter++;
+		currturn = !currturn;
 	}
 	print_boardstate();
-	check_game_over();
 }
 
 void update_gamestate(char input){
@@ -86,7 +123,6 @@ void update_gamestate(char input){
 		break;
 	case('e'):
 		update_boardstate();
-		currturn = !currturn;
 		break;
 	}
 
@@ -99,6 +135,7 @@ void main_loop(){
 	while(1){
 		while((input = getchar()) == '\n');
 		update_gamestate(input);
+		if (is_game_over()) break;
 	}
 }