Correctly handle discontinuous input i.e. stdin #197
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Fixes #196.
This PR properly handles the case when the reader is still available after returning an incomplete amount of data. When I initially rewrote the architecture of
hexyl, I only handled spurious incomplete reads by adding a second check. However,stdinis a reader that can return incomplete reads multiple times.This PR changes the second check to a loop that repeatedly reads until either the line buffer is filled or the reader is exhausted.