bpo-36763: Add _PyInitError functions (GH-13395)

* Add _PyInitError functions:

  * _PyInitError_Ok()
  * _PyInitError_Error()
  * _PyInitError_NoMemory()
  * _PyInitError_Exit()
  * _PyInitError_IsError()
  * _PyInitError_IsExit()
  * _PyInitError_Failed()

* frozenmain.c and _testembed.c now use functions rather than macros.
* Move _Py_INIT_xxx() macros to the internal API.
* Move _PyWstrList_INIT macro to the internal API.

3 files changed, 31 insertions, 2 deletions

diff --git a/Python/bootstrap_hash.c b/Python/bootstrap_hash.c
index dd752b8..fe71cc3 100644
--- a/Python/bootstrap_hash.c
+++ b/Python/bootstrap_hash.c
@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "pycore_coreconfig.h"
 #ifdef MS_WINDOWS
 #  include <windows.h>
 /* All sample MSDN wincrypt programs include the header below. It is at least
diff --git a/Python/coreconfig.c b/Python/coreconfig.c
index 2e8f4cf..3c17e35 100644
--- a/Python/coreconfig.c
+++ b/Python/coreconfig.c
@@ -203,6 +203,34 @@ fail:
 }
 
 
+/* --- _PyInitError ----------------------------------------------- */
+
+_PyInitError _PyInitError_Ok(void)
+{ return _Py_INIT_OK(); }
+
+_PyInitError _PyInitError_Error(const char *err_msg)
+{
+    return (_PyInitError){._type = _Py_INIT_ERR_TYPE_ERROR,
+                          .err_msg = err_msg};
+}
+
+_PyInitError _PyInitError_NoMemory(void)
+{ return _PyInitError_Error("memory allocation failed"); }
+
+_PyInitError _PyInitError_Exit(int exitcode)
+{ return _Py_INIT_EXIT(exitcode); }
+
+
+int _PyInitError_IsError(_PyInitError err)
+{ return _Py_INIT_IS_ERROR(err); }
+
+int _PyInitError_IsExit(_PyInitError err)
+{ return _Py_INIT_IS_EXIT(err); }
+
+int _PyInitError_Failed(_PyInitError err)
+{ return _Py_INIT_FAILED(err); }
+
+
 /* --- _PyWstrList ------------------------------------------------ */
 
 #ifndef NDEBUG
diff --git a/Python/frozenmain.c b/Python/frozenmain.c
index 0175e42..7b232bb 100644
--- a/Python/frozenmain.c
+++ b/Python/frozenmain.c
@@ -17,7 +17,7 @@ int
 Py_FrozenMain(int argc, char **argv)
 {
     _PyInitError err = _PyRuntime_Initialize();
-    if (_Py_INIT_FAILED(err)) {
+    if (_PyInitError_Failed(err)) {
         _Py_ExitInitError(err);
     }
 
@@ -84,7 +84,7 @@ Py_FrozenMain(int argc, char **argv)
     err = _Py_InitializeFromConfig(&config);
     /* No need to call _PyCoreConfig_Clear() since we didn't allocate any
        memory: program_name is a constant string. */
-    if (_Py_INIT_FAILED(err)) {
+    if (_PyInitError_Failed(err)) {
         _Py_ExitInitError(err);
     }