Humanize a netmask

main.go

package main

import (
	"fmt"
)

func main() {
	for _, nm := range []uint64{24, 8} {
		fmt.Printf("%d => %v\n", nm, humanizeNetmask(nm))
	}
}


// Found this on the internet somewhere and fixed it
func humanizeNetmask(netmask uint64) []uint64 {
	var mask uint64 = (0xFFFFFFFF << (32 - netmask)) & 0xFFFFFFFF //24 is the netmask
	var dmask uint64 = 32
	localmask := make([]uint64, 0, 4)
	var i uint64
	for i = 1; i <= 4; i++ {
		tmp := mask >> (dmask - 8) & 0xFF
		localmask = append(localmask, tmp)
		dmask -= 8
	}

	return localmask
}