Fundamentals 1 post

func (conf *dnsConfig) nameList(name string) []string {
	rooted := len(name) > 0 && name[len(name)-1] == '.'
	if rooted { // trailing dot: ask for this name only
		return []string{name}
	}
	hasNdots := bytealg.CountString(name, '.') >= conf.ndots
	name += "."
	var names []string
	if hasNdots { // enough dots: the name itself goes first
		names = append(names, name)
	}
	for _, suffix := range conf.search { // a candidate per search suffix
		names = append(names, name+suffix)
	}