streambuf::underflow() infinite loop

[Davis King]

I'm trying to make a stream buffer which reads from a socket and it
works fine in visual stuiod, borland 5.5.x and g++ 3.2.x but
I get an infinite loop in g++ 3.0.4! I imagine it's somehow my fault
though

So I have implemented overflow, xsputn, underflow, uflow, pbackfail and
xsgetn. I haven't made any buffers as I just
want it to read and write from the socket immediatly.

The infinite loop appears when I write cout << mystreambuf; It just
keeps calling underflow over and over and over...
All the underflow function doesn't modify the get pointers or anything.
It just leaves them as null.

Can anyone help me? (I'll paste some code in if necessary)



-Davis