(flex.info)I get an end-of-buffer message for each character scanned.

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I get an end-of-buffer message for each character scanned.
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This will happen if your LexerInput() function returns only one
character at a time, which can happen either if you're scanner is
"interactive", or if the streams library on your platform always returns
1 for yyin->gcount().

   Solution: override LexerInput() with a version that returns whole
buffers.