enter_reverse_mode
enter_reverse_mode = ABSENT_STRING;
|| PRESENT(enter_reverse_mode)))
ANDMISSING(enter_reverse_mode, exit_attribute_mode);
if (enter_reverse_mode)
enter_reverse_mode = ABSENT_STRING;
TurnOn(A_REVERSE, enter_reverse_mode);
if (enter_reverse_mode)
TurnOn(A_REVERSE, enter_reverse_mode);
CHECK_SGR(3, enter_reverse_mode);