LS_DISP_MODE
#define DISP_MODE(f) ((f) & LS_DISP_MODE)
flags = (flags & ~LS_DISP_MODE);
flags = (flags & ~LS_DISP_MODE) | LS_DISP_COLUMN;
flags = (flags & ~LS_DISP_MODE) | LS_DISP_LONG;
flags = (flags & ~LS_DISP_MODE) | LS_DISP_CROSS;