bpo-42208: Add _locale._get_locale_encoding() (GH-23052)

* Add a new _locale._get_locale_encoding() function to get the
  current locale encoding.
* Modify locale.getpreferredencoding() to use it.
* Remove the _bootlocale module.

1 files changed, 0 insertions, 46 deletions

diff --git a/Lib/_bootlocale.py b/Lib/_bootlocale.py
deleted file mode 100644
index 3273a3b..0000000
--- a/Lib/_bootlocale.py
+++ /dev/null
@@ -1,46 +0,0 @@
-"""A minimal subset of the locale module used at interpreter startup
-(imported by the _io module), in order to reduce startup time.
-
-Don't import directly from third-party code; use the `locale` module instead!
-"""
-
-import sys
-import _locale
-
-if sys.platform.startswith("win"):
-    def getpreferredencoding(do_setlocale=True):
-        if sys.flags.utf8_mode:
-            return 'UTF-8'
-        return _locale._getdefaultlocale()[1]
-else:
-    try:
-        _locale.CODESET
-    except AttributeError:
-        if hasattr(sys, 'getandroidapilevel'):
-            # On Android langinfo.h and CODESET are missing, and UTF-8 is
-            # always used in mbstowcs() and wcstombs().
-            def getpreferredencoding(do_setlocale=True):
-                return 'UTF-8'
-        else:
-            def getpreferredencoding(do_setlocale=True):
-                if sys.flags.utf8_mode:
-                    return 'UTF-8'
-                # This path for legacy systems needs the more complex
-                # getdefaultlocale() function, import the full locale module.
-                import locale
-                return locale.getpreferredencoding(do_setlocale)
-    else:
-        def getpreferredencoding(do_setlocale=True):
-            assert not do_setlocale
-            if sys.flags.utf8_mode:
-                return 'UTF-8'
-            result = _locale.nl_langinfo(_locale.CODESET)
-            if not result and sys.platform == 'darwin':
-                # nl_langinfo can return an empty string
-                # when the setting has an invalid value.
-                # Default to UTF-8 in that case because
-                # UTF-8 is the default charset on OSX and
-                # returning nothing will crash the
-                # interpreter.
-                result = 'UTF-8'
-            return result