Вот ещё что выдернул из tetris ASCII for Linux ....

while ((cmd=getchar())>0) {
            switch (cmd) {
                case 'q':
                    t.x--;
                    if (tetris_hittest(&t))
                        t.x++;
                    break;
                case 'd':
                    t.x++;
                    if (tetris_hittest(&t))
                        t.x--;
                    break;
                case 's':
                    tetris_gravity(&t);
                    break;
                case ' ':
                    tetris_rotate(&t);
                    break;
            }