[issue13848] io.open() doesn't check for embedded NUL characters

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Since the NUL-scanning will be useful for Modules/posixmodule.c as well, perhaps it should be done as a private _PyUnicode_HasNULChars() function.

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<http://bugs.python.org/issue13848>
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