OPT_TOGGLE
optflag = OPT_TOGGLE;
((flag == OPT_UNSET) ? OPT_TOGGLE : OPT_UNSET);
((flag == OPT_SET) ? OPT_TOGGLE : OPT_SET);
if ((optflag & ~OPT_NO_PROMPT) != OPT_TOGGLE ||
if (how_toggle == OPT_TOGGLE && (o->otype & NO_TOGGLE)) {
if (how_toggle == OPT_TOGGLE && *s == '\0')
case OPT_TOGGLE:
case OPT_TOGGLE:
case OPT_TOGGLE: