Re: dirname(3) used on its own results?

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

> But there's nothing in that bit that implies (to me!) 
> "You can't subsequently call dirname(3) on the results of 
> a previous call to dirname(3)".
You are calling dirname() on an argument that may be destroyed by 
that very call.
You are calling dirname() on a possibly invalid argument.