saved_tty
show_offset(NCURSES_PRESCREEN, saved_tty);
TTY * saved_tty; /* savetty/resetty information */
if (_nc_prescreen.saved_tty == 0) {
_nc_prescreen.saved_tty = typeCalloc(TTY, 1);
result = _nc_prescreen.saved_tty;
returnCode(NCURSES_SP_NAME(_nc_get_tty_mode) (NCURSES_SP_ARGx saved_tty(NCURSES_SP_ARG)));
returnCode(NCURSES_SP_NAME(_nc_set_tty_mode) (NCURSES_SP_ARGx saved_tty(NCURSES_SP_ARG)));