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[QUOTE="Kenneth Brody, post: 2382551"]
Jack Klein wrote:
[... Linux / fdopen() / select() / fgets() ...]

True.  However, they are irrelevent to the actual question being asked,
which boils down to his last sentence:

"How can I tell if anything resides in the FILE's buffer?"

The answer to that, AFAIK, is "you can't, without getting system-specific".
Make a function, let's call it "GetFileUnreadBufferCount(FILE *f)", which
will return the number of unread bytes in the FILE's buffer.  Isolate it
in a system-specific module, to make porting easier.

Then, you can make system-specific versions of this function.  Check with
your compiler vendors documentation, newsgroup, or support, to find out
if there is a way to do this with your specific compiler.

(Hint:  check the FILE structure definition.  It's probably hidden in there.)

Note, however, that even this, by itself, won't help you if there is a
partial line in the buffer, as fgets() will still block unless the rest
of the line is on the stream, but not yet read into the buffer.
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