cur_so 156 usr/sample/tetris/screen.c regcell so, cur_so = 0; cur_so 177 usr/sample/tetris/screen.c if (cur_so) { cur_so 178 usr/sample/tetris/screen.c cur_so = 0; cur_so 182 usr/sample/tetris/screen.c if (so != cur_so) { cur_so 183 usr/sample/tetris/screen.c cur_so = so;