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[...] The system guarantees to read the number of bytes requested if the
descriptor references a normal file that has that many bytes left before the
end-of-file [...]

> > > On a side note, I saw you removed the unused prevnumber variable.
> > > Apparently I wanted to make sure to not set the same backdrop twice,
> > > but forgot to implement that ;-) I still like the idea.
> > 
> > I'll implement that :)
> 
> great!

Done.

regards,
Benedikt

-- 
Those who do not understand Unix are condemned to reinvent it, poorly.
    -- Henry Spencer