package acl

import "net"

func parseIPZone(s string) (net.IP, string) {
	s, zone := splitHostZone(s)
	return net.ParseIP(s), zone
}

func splitHostZone(s string) (host, zone string) {
	if i := last(s, '%'); i > 0 {
		host, zone = s[:i], s[i+1:]
	} else {
		host = s
	}
	return
}

func last(s string, b byte) int {
	i := len(s)
	for i--; i >= 0; i-- {
		if s[i] == b {
			break
		}
	}
	return i
}