From: fw <fwmailinglists@...>
Date: 2008-01-18T23:04:16+09:00
Subject: Re: succ question of ip addr string

On Fri, 2008-01-18 at 18:22 +0900, Ak 756 wrote:
> Hi
> 
> I have a ip addr string as "192.168.000.000", I use succ! method to get
> the next ip addr string. It works for the first 255 times but when ip
> reachs "192.168.000.255", the succ! returns "192.168.000.256" but what I
> want is "192.168.001.000".  Would anyone kindly help to tell me how to
> do?
> 
> Thanks in advance.

Instead of strings, use the IPAddr core class to represent IP addresses.
While it doesn't have a built in method for determining the next IP
address, you can add the functionality like so:

$ irb
irb(main):001:0> require 'ipaddr'
=> true
irb(main):002:0> class IPAddr
irb(main):003:1> def succ!
irb(main):004:2> @addr += 1
irb(main):005:2> self
irb(main):006:2> end
irb(main):007:1> end
=> nil
irb(main):008:0> a = IPAddr.new('192.168.0.255')
=> #<IPAddr: IPv4:192.168.0.255/255.255.255.255>
irb(main):009:0> a.succ!
=> #<IPAddr: IPv4:192.168.1.0/255.255.255.255>
irb(main):010:0> 

HTH,

Felix