[RFC/Patch] What about using seekoff(-1, ...) for unbuffered underflow?

[Paolo Carlini]

Paolo Carlini wrote:

> ... however, I like even more the below, slightly simpler and which 
> definitely
> keeps pbackfail working correctly (I will prepare a testcase for this, 
> anyway). 

Actually, I believe a slight change is needed for pbackfail, in order to
correctly return to the normal unbuffered situation after a sequence
sgetc - putback.

I will therefore test the below together with some tests for unbuffered 
pback.

Paolo.

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