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Re: int to inet conversion

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Martijn van Oosterhout wrote:

On Sun, Dec 04, 2005 at 02:09:53PM +0300, Anton Nikiforov wrote:

Sorry for my stupidity but, maybe there is a function that converts mask stored in int format to a numer of bits? ;) Your function easyly convert this mask to dot decimal notation, but how to count the number of 1 in it?


No, but you can write one the same way like so:

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.....

Best regards,
Anton

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