On Fri, Feb 28, 2014 at 01:27:35PM +0100, Daniel Wendler wrote: > Hello List, > > at the moment we try to implement an fine granulary filter mechanism in our > Bird > OSPF setup. We ask ourselfes if anyone has implementet bitwise operations in > Bird filters which is not in official code. > If not, are there any plans to implement such an feature in Bird filters or > should we try it to implement on our own and contribute this to the mailing > list?
Hi
Although adding bitfield operations is generally a good idea, your
problem could be easily solved with current code and this filter
function (a - number, b - value of the bit):
function bittest(int a; int b)
{
return a/(2*b) != (a+b)/(2*b);
}
bittest(13,1) -> true
bittest(13,2) -> false
bittest(13,4) -> true
bittest(13,8) -> true
bittest(13,16) -> false
--
Elen sila lumenn' omentielvo
Ondrej 'SanTiago' Zajicek (email: santi...@crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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