games can draw

uttt.c

@@ -49,7 +49,18 @@ char ut_winner(char *tiles, int offset, int stride) {
 	if (tile == T(0, 0) && tile == T(2, 2)) {return tile;}
 	if (tile == T(2, 0) && tile == T(0, 2)) {return tile;}
 
-	return '\0';
+	// check for draw
+	for (int y = 0; y < 3; y++) {
+		for (int x = 0; x < 3; x++) {
+			if (T(x, y) == '\0') {
+				// tile is empty - not a draw
+				return '\0';
+			}
+		}
+	}
+
+	// draw
+	return -1;
 }
 
 int ut_move(struct ut_state *new_state, const struct ut_state *old_state, int row, int col)
@@ -87,23 +98,6 @@ void ut_show(const struct ut_state *state) {
 		play_board_row = state->playBoard / 3;
 		play_board_col = state->playBoard % 3;
 	}
-    /*for(int i = 0; i < 3; i++)
-    {
-        putchar(' ');
-        for(int j = 0; j < 3; j++)
-        {
-            printf("%d ");
-        }
-    }
-    for(int br = 0; br < 3; br++)
-    {
-        for(int r = 0; r < 3; r++)
-        {
-        }for(int bc = 0; bc < 3; bc++)
-        {
-            
-        }
-    }*/
 	printf("  012 345 678\n");
     for(int y = 0; y < 9; y++)
     {
@@ -161,11 +155,7 @@ bool getpos(const struct ut_state *state, int *x, int *y) {
 			return false;
 		if (sscanf_result != 2)
 			continue;
-		/*
-		if (
-			*x >= 0 && *x < 9 && *y >= 0 && *y < 9
-			&& board->tiles[*y][*x] == '\0'
-		) */ break;
+		break;
 	}
 	return true;
 }