| From: | Anton Nikiforov <anton(at)nikiforov(dot)ru> |
|---|---|
| To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: int to inet conversion |
| Date: | 2005-12-05 01:36:28 |
| Message-ID: | 4393999C.5000101@nikiforov.ru |
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| Thread: | |
| Lists: | pgsql-general |
Martijn van Oosterhout wrote:
> On Sun, Dec 04, 2005 at 03:21:47PM +0300, Anton Nikiforov wrote:
>
>>Martijn van Oosterhout wrote:
>>
>>>Let i be your input.
>>>Calculate t = -i.
>>>If i is in the right format, t will have exactly one bit set.
>>>Test this with t <> 0 and (t & i) == t
>>>If that's ok, then your answer is 32 - log2(t)
>>>
>>>Have a nice day,
>>
>>Sorry, did not quite catch.
>>t in this case is int, and there is no log2(int) function.....
>
>
> But there is a log(x,y) function, so log(2,t) would work also. Note
> that 255.255.255.0 stored as integer is -256.
>
> Have a nice day,
Thanks alot!
Best regards,
Anton
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