[issue1950] Potential overflows due to incorrect usage of PyUnicode_AsString.

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

The patch looks good.  Just a question: I thought the strings returned by PyUnicode_AsStringAndSize are 0-terminated, while your patch at several 
places attempts to explicitly 0-terminate a copy of such string.  Are you 
sure this is necessary?

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