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

[Antoine Pitrou]

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

Yes, fixing the conversion block is probably the right approach.
Apparently posixmodule.c uses PyUnicode_FSConverter, perhaps that would work?
(also make sure that the case where a bytes string is given is fixed too:

>>> open(b"\x00")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FileNotFoundError: [Errno 2] No such file or directory: ''
)

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