bpo-29240: Fix locale encodings in UTF-8 Mode (#5170)

Modify locale.localeconv(), time.tzname, os.strerror() and other
functions to ignore the UTF-8 Mode: always use the current locale
encoding.

Changes:

* Add _Py_DecodeLocaleEx() and _Py_EncodeLocaleEx(). On decoding or
  encoding error, they return the position of the error and an error
  message which are used to raise Unicode errors in
  PyUnicode_DecodeLocale() and PyUnicode_EncodeLocale().
* Replace _Py_DecodeCurrentLocale() with _Py_DecodeLocaleEx().
* PyUnicode_DecodeLocale() now uses _Py_DecodeLocaleEx() for all
  cases, especially for the strict error handler.
* Add _Py_DecodeUTF8Ex(): return more information on decoding error
  and supports the strict error handler.
* Rename _Py_EncodeUTF8_surrogateescape() to _Py_EncodeUTF8Ex().
* Replace _Py_EncodeCurrentLocale() with _Py_EncodeLocaleEx().
* Ignore the UTF-8 mode to encode/decode localeconv(), strerror()
  and time zone name.
* Remove PyUnicode_DecodeLocale(), PyUnicode_DecodeLocaleAndSize()
  and PyUnicode_EncodeLocale() now ignore the UTF-8 mode: always use
  the "current" locale.
* Remove _PyUnicode_DecodeCurrentLocale(),
  _PyUnicode_DecodeCurrentLocaleAndSize() and
  _PyUnicode_EncodeCurrentLocale().

1 files changed, 2 insertions, 1 deletions

diff --git a/Modules/_localemodule.c b/Modules/_localemodule.c
index e364668..324b694 100644
--- a/Modules/_localemodule.c
+++ b/Modules/_localemodule.c
@@ -572,8 +572,9 @@ PyIntl_bind_textdomain_codeset(PyObject* self,PyObject*args)
     if (!PyArg_ParseTuple(args, "sz", &domain, &codeset))
         return NULL;
     codeset = bind_textdomain_codeset(domain, codeset);
-    if (codeset)
+    if (codeset) {
         return PyUnicode_DecodeLocale(codeset, NULL);
+    }
     Py_RETURN_NONE;
 }
 #endif