[issue8725] Python3: use ASCII for the file system encoding on initfsencoding() failure

[STINNER Victor]

New submission from STINNER Victor <victor.stinner at haypocalc.com>:

I introduced initfsencoding() in #8610 to ensure that Py_FileSystemEncoding is not more NULL. In the discussion, Marc Lemburg noticed that falling back the UTF-8 on nl_langinfo(CODESET) error is a bad idea: ASCII is better (I agree).

We cannot fall back to ASCII yet because there are two other problems that have to be fixed before that:

 - Python3 doesn't support surrogates in module filenames: see #8611
 - If Py_FileSystemEncoding is NULL, encoding functions fallback to utf-8 (PyUnicode_GetDefaultEncoding()). #8715 proposes a new PyUnicode_EncodeFSDefault() function to fix this problem

Attached patch is a partial fix for this issue.

----------
components: Interpreter Core, Unicode
files: fsencoding_ascii.patch
keywords: patch
messages: 105804
nosy: haypo
priority: normal
severity: normal
status: open
title: Python3: use ASCII for the file system encoding on initfsencoding() failure
versions: Python 3.2
Added file: http://bugs.python.org/file17353/fsencoding_ascii.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8725>
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