AWK Helper function to calculate netmask

AWK Helper function to calculate netmask
0

I'd like to see one converting ie. 255.255.255.0 -> 24. Seen multiple approaches to this example but I think this one is the most performant:


netMaskToCIDR["0.0.0.0"] = 0
    netMaskToCIDR["128.0.0.0"] = 1
    netMaskToCIDR["192.0.0.0"] = 2
    netMaskToCIDR["224.0.0.0"] = 3
    netMaskToCIDR["240.0.0.0"] = 4
    netMaskToCIDR["248.0.0.0"] = 5
    netMaskToCIDR["252.0.0.0"] = 6
    netMaskToCIDR["254.0.0.0"] = 7
    netMaskToCIDR["255.0.0.0"] = 8
    netMaskToCIDR["255.128.0.0"] = 9
    netMaskToCIDR["255.192.0.0"] = 10
    netMaskToCIDR["255.224.0.0"] = 11
    netMaskToCIDR["255.240.0.0"] = 12
    netMaskToCIDR["255.248.0.0"] = 13
    netMaskToCIDR["255.252.0.0"] = 14
    netMaskToCIDR["255.254.0.0"] = 15
    netMaskToCIDR["255.255.0.0"] = 16
    netMaskToCIDR["255.255.128.0"] = 17
    netMaskToCIDR["255.255.192.0"] = 18
    netMaskToCIDR["255.255.224.0"] = 19
    netMaskToCIDR["255.255.240.0"] = 20
    netMaskToCIDR["255.255.248.0"] = 21
    netMaskToCIDR["255.255.252.0"] = 22
    netMaskToCIDR["255.255.254.0"] = 23
    netMaskToCIDR["255.255.255.0"] = 24
    netMaskToCIDR["255.255.255.128"] = 25
    netMaskToCIDR["255.255.255.192"] = 26
    netMaskToCIDR["255.255.255.224"] = 27
    netMaskToCIDR["255.255.255.240"] = 28
    netMaskToCIDR["255.255.255.248"] = 29
    netMaskToCIDR["255.255.255.252"] = 30
    netMaskToCIDR["255.255.255.254"] = 31
    netMaskToCIDR["255.255.255.255"] = 32

Would save a lot of code deduplication by adding this to the helper function library.


/Patrik


Credit goes to Hawkeye who suggested this in my PR.

We will add it to our backlog. Thanks for sharing

Thanks Patrik