Number of characters buffered by stdio detection.

[Diomidis Spinellis]

I want to use select(2) on an stdio buffered stream.  The problem
is that before calling select I need to check if there are any
characters in the buffer.  I have not found any function that
returns such a value, so I use _iob(x)->_cnt.  This is not part
of the documented stdio interfaces and thus non-portable.  Is there
a better way to do this?

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Diomidis Spinellis
European Computer Industry Research Centre