Add IPv6 default route to the output of sipcalc(1)

sipcalc-add-ipv6-default-route.awk

#! /usr/bin/awk -f

# Add IPv6 default route to the output of sipcalc(1)
# Copyright (C) 2009 Matous Jan Fialka, <http://mjf.cz/>
# Released under the terms of The MIT License
#
# Assumes last usable IPv6 address as default route.
# 
# Usage: sipcalc <net>[/<mask>] | sipcalc-add-ipv6-default-route.awk

/^Network range/ {
	route = $4
}

! $1 {
	if (seen_blank)
		next
	seen_blank = 1
}

/^-$/ {
	printf("Default route (gateway)\t- %s\n",
		substr(route, 1, length(route) - 1) "1")
}

{ print }