started dev on TicTacToe

src/userland/games/tictactoe.c

@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2026 Jannis Heydemann
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <libc/libui.h>
+
+#define WINDOW_W 400
+#define WINDOW_H 400
+
+char cPlayfield[3][3] = {
+    {' ', ' ', ' '},
+    {' ', ' ', ' '},
+    {' ', ' ', ' '}};
+
+char *ptrPlayfield;
+char currentUser;
+
+int running = 1;
+int counter = 1;
+
+void renderPlayfield();
+void getUserInput();
+void checkForWin();
+
+int main()
+{
+  while (running == 1)
+  {
+    renderPlayfield();
+    currentUser = counter++ % 2 == 1 ? 'X' : 'O';
+    getUserInput();
+    checkForWin();
+  }
+  return 0;
+}
+
+void renderPlayfield()
+{
+#ifdef WIN32
+  system("cls");
+#endif
+
+#ifdef linux
+  system("clear");
+#endif
+
+  printf("  | 1 | 2 | 3 |\n");
+  printf("---------------\n");
+  for (int i = 0; i < 3; i++)
+  {
+    printf("%d | ", i + 1);
+    for (int j = 0; j < 3; j++)
+    {
+      ptrPlayfield = &cPlayfield[i][j];
+      printf("%c | ", *ptrPlayfield);
+    }
+    printf("\n---------------\n");
+  }
+}
+
+void getUserInput()
+{
+  int currentCol = 0;
+  int currentRow = 0;
+  printf("\nCurrent Player: %c\n", currentUser);
+  printf("Row and Colum: ");
+  scanf("%d %d", &currentRow, &currentCol);
+
+  if (currentRow < 1 || currentRow > 3 || currentCol < 1 || currentCol > 3)
+  {
+    printf("Your Input is out of Range. Use only numbers 1, 2 or 3. \n");
+    return getUserInput();
+  }
+  else
+  {
+    cPlayfield[currentRow - 1][currentCol - 1] = currentUser;
+  }
+  return;
+}
+
+void checkForWin()
+{
+  for (int i = 0; i < 3; i++)
+  {
+    if (cPlayfield[i][0] == cPlayfield[i][1] && cPlayfield[i][1] == cPlayfield[i][2] && cPlayfield[i][2] != ' ')
+    {
+      running = 0;
+      renderPlayfield();
+      printf("The winner is: %c\n", cPlayfield[i][0]);
+      return;
+    }
+
+    if (cPlayfield[0][i] == cPlayfield[1][i] && cPlayfield[1][i] == cPlayfield[2][i] && cPlayfield[2][i] != ' ')
+    {
+      running = 0;
+      renderPlayfield();
+      printf("The winner is: %c\n", cPlayfield[0][i]);
+      return;
+    }
+  }
+  if (cPlayfield[0][0] == cPlayfield[1][1] && cPlayfield[1][1] == cPlayfield[2][2] && cPlayfield[2][2] != ' ')
+  {
+    running = 0;
+    renderPlayfield();
+    printf("The winner is %c\n", cPlayfield[0][0]);
+    return;
+  }
+
+  if (cPlayfield[0][2] == cPlayfield[1][1] && cPlayfield[1][1] == cPlayfield[2][0] && cPlayfield[2][0] != ' ')
+  {
+    running = 0;
+    renderPlayfield();
+    printf("The winner is %d\n", cPlayfield[0][2]);
+    return;
+  }
+}