bpo-36301: Add _PyWstrList structure (GH-12343)

Replace messy _Py_wstrlist_xxx() functions with a new clean
_PyWstrList structure and new _PyWstrList_xxx() functions.

Changes:

* Add _PyCoreConfig.use_module_search_paths to decide if
  _PyCoreConfig.module_search_paths should be computed or not, to
  support empty search path list.
* _PyWstrList_Clear() sets length to 0 and items to NULL, whereas
  _Py_wstrlist_clear() only freed memory.
* _PyWstrList_Append() returns an int, whereas _Py_wstrlist_append()
  returned _PyInitError.
* _PyWstrList uses Py_ssize_t for the length, instead of int.
* Replace (int, wchar_t**) with _PyWstrList in:

  * _PyPreConfig
  * _PyCoreConfig
  * _PyPreCmdline
  * _PyCmdline

* Replace "int orig_argv; wchar_t **orig_argv;"
  with "_PyWstrList orig_argv".
* _PyCmdline and _PyPreCmdline now also copy wchar_argv.
* Rename _PyArgv_Decode() to _PyArgv_AsWstrList().
* PySys_SetArgvEx() now pass the fixed (argc, argv) to
  _PyPathConfig_ComputeArgv0() (don't pass negative argc or NULL
  argv).
* _PyOS_GetOpt() uses Py_ssize_t

1 files changed, 3 insertions, 3 deletions

diff --git a/Include/internal/pycore_getopt.h b/Include/internal/pycore_getopt.h
index 1d30f5b..0d1897c 100644
--- a/Include/internal/pycore_getopt.h
+++ b/Include/internal/pycore_getopt.h
@@ -6,8 +6,8 @@
 #endif
 
 extern int _PyOS_opterr;
-extern int _PyOS_optind;
-extern wchar_t *_PyOS_optarg;
+extern Py_ssize_t _PyOS_optind;
+extern const wchar_t *_PyOS_optarg;
 
 extern void _PyOS_ResetGetOpt(void);
 
@@ -17,6 +17,6 @@ typedef struct {
     int val;
 } _PyOS_LongOption;
 
-extern int _PyOS_GetOpt(int argc, wchar_t **argv, int *longindex);
+extern int _PyOS_GetOpt(Py_ssize_t argc, wchar_t **argv, int *longindex);
 
 #endif /* !Py_INTERNAL_PYGETOPT_H */