bpo-36775: _PyCoreConfig only uses wchar_t* (GH-13062)

_PyCoreConfig: Change filesystem_encoding, filesystem_errors,
stdio_encoding and stdio_errors fields type from char* to wchar_t*.

Changes:

* PyInterpreterState: replace fscodec_initialized (int) with fs_codec
  structure.
* Add get_error_handler_wide() and unicode_encode_utf8() helper
  functions.
* Add error_handler parameter to unicode_encode_locale()
  and unicode_decode_locale().
* Remove _PyCoreConfig_SetString().
* Rename _PyCoreConfig_SetWideString() to _PyCoreConfig_SetString().
* Rename _PyCoreConfig_SetWideStringFromString()
  to _PyCoreConfig_DecodeLocale().

1 files changed, 8 insertions, 1 deletions

diff --git a/Include/internal/pycore_pystate.h b/Include/internal/pycore_pystate.h
index 2c24f679dc..67bcd147e2 100644
--- a/Include/internal/pycore_pystate.h
+++ b/Include/internal/pycore_pystate.h
@@ -56,7 +56,14 @@ struct _is {
     PyObject *codec_search_cache;
     PyObject *codec_error_registry;
     int codecs_initialized;
-    int fscodec_initialized;
+
+    /* fs_codec.encoding is initialized to NULL.
+       Later, it is set to a non-NULL string by _PyUnicode_InitEncodings(). */
+    struct {
+        char *encoding;   /* Filesystem encoding (encoded to UTF-8) */
+        char *errors;     /* Filesystem errors (encoded to UTF-8) */
+        _Py_error_handler error_handler;
+    } fs_codec;
 
     _PyCoreConfig core_config;
 #ifdef HAVE_DLOPEN