+ttt_cell_t ttt_board_is_won (ttt_board_t *board)
+{
+ int i;
+ for (i = 0; i <= 2; i++)
+ {
+ if (board->cells[i] != TTT_CELL_EMPTY && board->cells[i] == board->cells[i + 3] && board->cells[i] == board->cells[i + 6])
+ return(board->cells[i]);
+ else if (board->cells[i * 3] != TTT_CELL_EMPTY && board->cells[i * 3] == board->cells[(i * 3) + 1] && board->cells[i * 3] == board->cells[(i * 3) + 2])
+ return(board->cells[i * 3]);
+ }
+ if (board->cells[0] != TTT_CELL_EMPTY && board->cells[0] == board->cells[4] && board->cells[0]== board->cells[8])
+ return(board->cells[0]);
+ if (board->cells[2] != TTT_CELL_EMPTY && board->cells[2] == board->cells[4] && board->cells[2]== board->cells[6])
+ return(board->cells[2]);
+ return(TTT_CELL_EMPTY);
+}