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Exercise 8.2 - Rewrite fopen and _fillbuf with fields
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Question
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Rewrite fopen and _fillbuf with fields instead of explicit bit operations.
Compare code size and execution speed.

.. literalinclude:: cprogs/ex_8.2.c
   :language: c

Explanation
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This is a low level implementation of fopen and _fillbuf with enums and fields.