Martin v. Löwis <mar...@v.loewis.de> added the comment:

> Does anyone know what other compilers use signed chars?

Most of them do, including gcc, on most platforms. unsigned char is really the 
uncommon case.

The patch is incorrect; Py_CHARMASK is correct as it stands. It is *not* the 
objective of Py_CHARMASK to produce a char, but (as the comment above its 
definition explains) to produce an int.

The question really is why you get a value of -1 into c in the first place. 
Could it be that you are past the end of file, and reading EOF "characters"?

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<http://bugs.python.org/issue9020>
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