Hi!
I am using the GNU Common C++ library (version 1.3.25) class TTYSession
to implement a simple XModem program. A very elegant abstraction, I must
admit.
During an XModem session I wish to peek at a character in the incoming
byte stream. To do that, I call the method peek(), inherited from
std::istream.
However, this breaks the method TTYStream::isPending().
If the serial device buffer contains 1 unread byte, isPending() returns
"true";
However, if peek() is called before isPending(), isPending returns
"false" - regardless of the fact that unread data is in the buffer.
To me, this behaviour seems rather undesirable. I wish to check (in
different functions) if data is available for reading with isPending()
and occasionally take a peek at that data without actually reading it.
I took a quick look at your code starting at "serial.c:988". You use
poll() to check for incoming bytes. The istream::peek() method probably
marks the byte as "read" and poll() does not detect it.
Is it possible to either override istream::peek() or rewrite
TTYStream::isPending() so that it becomes possible to peek at data
before doing isPending() check on it?
--
Best Regards,
Tarmo Kuuse
Software developer
Oskando Ltd
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