4 files changed, 164 insertions, 149 deletions

diff --git a/Include/coreconfig.h b/Include/coreconfig.h
index ff7b684..a7d3983 100644
--- a/Include/coreconfig.h
+++ b/Include/coreconfig.h
@@ -358,9 +358,10 @@ PyAPI_FUNC(int) _PyCoreConfig_GetEnvDup(
     wchar_t **dest,
     wchar_t *wname,
     char *name);
-#endif
-
 
+/* Used by _testcapi.get_coreconfig() */
+PyAPI_FUNC(PyObject *) _PyCoreConfig_AsDict(const _PyCoreConfig *config);
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/Include/internal/pycore_pathconfig.h b/Include/internal/pycore_pathconfig.h
index 395df49..00d7bbf 100644
--- a/Include/internal/pycore_pathconfig.h
+++ b/Include/internal/pycore_pathconfig.h
@@ -4,6 +4,10 @@
 extern "C" {
 #endif
 
+#ifndef Py_BUILD_CORE
+#  error "Py_BUILD_CORE must be defined to include this header"
+#endif
+
 PyAPI_FUNC(void) _Py_wstrlist_clear(
     int len,
     wchar_t **list);
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index e2deb26..3133d2b 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -10,7 +10,6 @@
 #include "Python.h"
 #include "datetime.h"
 #include "marshal.h"
-#include "pycore_pathconfig.h"
 #include "pythread.h"
 #include "structmember.h"
 #include <float.h>
@@ -24,6 +23,10 @@
 #include <sys/wait.h>           /* For W_STOPCODE */
 #endif
 
+#ifdef Py_BUILD_CORE
+#  error "_testcapi must test the public Python C API, not CPython internal C API"
+#endif
+
 static PyObject *TestError;     /* set to exception object in init */
 
 /* Raise TestError with test_name + ": " + msg, and return NULL. */
@@ -4670,152 +4673,7 @@ get_coreconfig(PyObject *self, PyObject *Py_UNUSED(args))
 {
     PyInterpreterState *interp = _PyInterpreterState_Get();
     const _PyCoreConfig *config = &interp->core_config;
-    PyObject *dict, *obj;
-
-    dict = PyDict_New();
-    if (dict == NULL) {
-        return NULL;
-    }
-
-#define FROM_STRING(STR) \
-    ((STR != NULL) ? \
-        PyUnicode_FromString(STR) \
-        : (Py_INCREF(Py_None), Py_None))
-#define FROM_WSTRING(STR) \
-    ((STR != NULL) ? \
-        PyUnicode_FromWideChar(STR, -1) \
-        : (Py_INCREF(Py_None), Py_None))
-#define SET_ITEM(KEY, EXPR) \
-        do { \
-            obj = (EXPR); \
-            if (obj == NULL) { \
-                return NULL; \
-            } \
-            int res = PyDict_SetItemString(dict, (KEY), obj); \
-            Py_DECREF(obj); \
-            if (res < 0) { \
-                goto fail; \
-            } \
-        } while (0)
-
-    SET_ITEM("install_signal_handlers",
-             PyLong_FromLong(config->install_signal_handlers));
-    SET_ITEM("use_environment",
-             PyLong_FromLong(config->use_environment));
-    SET_ITEM("use_hash_seed",
-             PyLong_FromLong(config->use_hash_seed));
-    SET_ITEM("hash_seed",
-             PyLong_FromUnsignedLong(config->hash_seed));
-    SET_ITEM("allocator",
-             FROM_STRING(config->allocator));
-    SET_ITEM("dev_mode",
-             PyLong_FromLong(config->dev_mode));
-    SET_ITEM("faulthandler",
-             PyLong_FromLong(config->faulthandler));
-    SET_ITEM("tracemalloc",
-             PyLong_FromLong(config->tracemalloc));
-    SET_ITEM("import_time",
-             PyLong_FromLong(config->import_time));
-    SET_ITEM("show_ref_count",
-             PyLong_FromLong(config->show_ref_count));
-    SET_ITEM("show_alloc_count",
-             PyLong_FromLong(config->show_alloc_count));
-    SET_ITEM("dump_refs",
-             PyLong_FromLong(config->dump_refs));
-    SET_ITEM("malloc_stats",
-             PyLong_FromLong(config->malloc_stats));
-    SET_ITEM("coerce_c_locale",
-             PyLong_FromLong(config->coerce_c_locale));
-    SET_ITEM("coerce_c_locale_warn",
-             PyLong_FromLong(config->coerce_c_locale_warn));
-    SET_ITEM("filesystem_encoding",
-             FROM_STRING(config->filesystem_encoding));
-    SET_ITEM("filesystem_errors",
-             FROM_STRING(config->filesystem_errors));
-    SET_ITEM("stdio_encoding",
-             FROM_STRING(config->stdio_encoding));
-    SET_ITEM("utf8_mode",
-             PyLong_FromLong(config->utf8_mode));
-    SET_ITEM("pycache_prefix",
-             FROM_WSTRING(config->pycache_prefix));
-    SET_ITEM("program_name",
-             FROM_WSTRING(config->program_name));
-    SET_ITEM("argv",
-             _Py_wstrlist_as_pylist(config->argc, config->argv));
-    SET_ITEM("program",
-             FROM_WSTRING(config->program));
-    SET_ITEM("warnoptions",
-             _Py_wstrlist_as_pylist(config->nwarnoption, config->warnoptions));
-    SET_ITEM("module_search_path_env",
-             FROM_WSTRING(config->module_search_path_env));
-    SET_ITEM("home",
-             FROM_WSTRING(config->home));
-    SET_ITEM("module_search_paths",
-             _Py_wstrlist_as_pylist(config->nmodule_search_path, config->module_search_paths));
-    SET_ITEM("executable",
-             FROM_WSTRING(config->executable));
-    SET_ITEM("prefix",
-             FROM_WSTRING(config->prefix));
-    SET_ITEM("base_prefix",
-             FROM_WSTRING(config->base_prefix));
-    SET_ITEM("exec_prefix",
-             FROM_WSTRING(config->exec_prefix));
-    SET_ITEM("base_exec_prefix",
-             FROM_WSTRING(config->base_exec_prefix));
-#ifdef MS_WINDOWS
-    SET_ITEM("dll_path",
-             FROM_WSTRING(config->dll_path));
-#endif
-    SET_ITEM("isolated",
-             PyLong_FromLong(config->isolated));
-    SET_ITEM("site_import",
-             PyLong_FromLong(config->site_import));
-    SET_ITEM("bytes_warning",
-             PyLong_FromLong(config->bytes_warning));
-    SET_ITEM("inspect",
-             PyLong_FromLong(config->inspect));
-    SET_ITEM("interactive",
-             PyLong_FromLong(config->interactive));
-    SET_ITEM("optimization_level",
-             PyLong_FromLong(config->optimization_level));
-    SET_ITEM("parser_debug",
-             PyLong_FromLong(config->parser_debug));
-    SET_ITEM("write_bytecode",
-             PyLong_FromLong(config->write_bytecode));
-    SET_ITEM("verbose",
-             PyLong_FromLong(config->verbose));
-    SET_ITEM("quiet",
-             PyLong_FromLong(config->quiet));
-    SET_ITEM("user_site_directory",
-             PyLong_FromLong(config->user_site_directory));
-    SET_ITEM("buffered_stdio",
-             PyLong_FromLong(config->buffered_stdio));
-    SET_ITEM("stdio_encoding",
-             FROM_STRING(config->stdio_encoding));
-    SET_ITEM("stdio_errors",
-             FROM_STRING(config->stdio_errors));
-#ifdef MS_WINDOWS
-    SET_ITEM("legacy_windows_fs_encoding",
-             PyLong_FromLong(config->legacy_windows_fs_encoding));
-    SET_ITEM("legacy_windows_stdio",
-             PyLong_FromLong(config->legacy_windows_stdio));
-#endif
-    SET_ITEM("_install_importlib",
-             PyLong_FromLong(config->_install_importlib));
-    SET_ITEM("_check_hash_pycs_mode",
-             FROM_STRING(config->_check_hash_pycs_mode));
-    SET_ITEM("_frozen",
-             PyLong_FromLong(config->_frozen));
-
-    return dict;
-
-fail:
-    Py_DECREF(dict);
-    return NULL;
-
-#undef FROM_STRING
-#undef FROM_WSTRING
-#undef SET_ITEM
+    return _PyCoreConfig_AsDict(config);
 }
 
 
diff --git a/Python/coreconfig.c b/Python/coreconfig.c
index b21e934..b6fc33c 100644
--- a/Python/coreconfig.c
+++ b/Python/coreconfig.c
@@ -1358,3 +1358,155 @@ _PyCoreConfig_Read(_PyCoreConfig *config)
 
     return _Py_INIT_OK();
 }
+
+
+PyObject *
+_PyCoreConfig_AsDict(const _PyCoreConfig *config)
+{
+    PyObject *dict, *obj;
+
+    dict = PyDict_New();
+    if (dict == NULL) {
+        return NULL;
+    }
+
+#define FROM_STRING(STR) \
+    ((STR != NULL) ? \
+        PyUnicode_FromString(STR) \
+        : (Py_INCREF(Py_None), Py_None))
+#define FROM_WSTRING(STR) \
+    ((STR != NULL) ? \
+        PyUnicode_FromWideChar(STR, -1) \
+        : (Py_INCREF(Py_None), Py_None))
+#define SET_ITEM(KEY, EXPR) \
+        do { \
+            obj = (EXPR); \
+            if (obj == NULL) { \
+                return NULL; \
+            } \
+            int res = PyDict_SetItemString(dict, (KEY), obj); \
+            Py_DECREF(obj); \
+            if (res < 0) { \
+                goto fail; \
+            } \
+        } while (0)
+
+    SET_ITEM("install_signal_handlers",
+             PyLong_FromLong(config->install_signal_handlers));
+    SET_ITEM("use_environment",
+             PyLong_FromLong(config->use_environment));
+    SET_ITEM("use_hash_seed",
+             PyLong_FromLong(config->use_hash_seed));
+    SET_ITEM("hash_seed",
+             PyLong_FromUnsignedLong(config->hash_seed));
+    SET_ITEM("allocator",
+             FROM_STRING(config->allocator));
+    SET_ITEM("dev_mode",
+             PyLong_FromLong(config->dev_mode));
+    SET_ITEM("faulthandler",
+             PyLong_FromLong(config->faulthandler));
+    SET_ITEM("tracemalloc",
+             PyLong_FromLong(config->tracemalloc));
+    SET_ITEM("import_time",
+             PyLong_FromLong(config->import_time));
+    SET_ITEM("show_ref_count",
+             PyLong_FromLong(config->show_ref_count));
+    SET_ITEM("show_alloc_count",
+             PyLong_FromLong(config->show_alloc_count));
+    SET_ITEM("dump_refs",
+             PyLong_FromLong(config->dump_refs));
+    SET_ITEM("malloc_stats",
+             PyLong_FromLong(config->malloc_stats));
+    SET_ITEM("coerce_c_locale",
+             PyLong_FromLong(config->coerce_c_locale));
+    SET_ITEM("coerce_c_locale_warn",
+             PyLong_FromLong(config->coerce_c_locale_warn));
+    SET_ITEM("filesystem_encoding",
+             FROM_STRING(config->filesystem_encoding));
+    SET_ITEM("filesystem_errors",
+             FROM_STRING(config->filesystem_errors));
+    SET_ITEM("stdio_encoding",
+             FROM_STRING(config->stdio_encoding));
+    SET_ITEM("utf8_mode",
+             PyLong_FromLong(config->utf8_mode));
+    SET_ITEM("pycache_prefix",
+             FROM_WSTRING(config->pycache_prefix));
+    SET_ITEM("program_name",
+             FROM_WSTRING(config->program_name));
+    SET_ITEM("argv",
+             _Py_wstrlist_as_pylist(config->argc, config->argv));
+    SET_ITEM("program",
+             FROM_WSTRING(config->program));
+    SET_ITEM("warnoptions",
+             _Py_wstrlist_as_pylist(config->nwarnoption, config->warnoptions));
+    SET_ITEM("module_search_path_env",
+             FROM_WSTRING(config->module_search_path_env));
+    SET_ITEM("home",
+             FROM_WSTRING(config->home));
+    SET_ITEM("module_search_paths",
+             _Py_wstrlist_as_pylist(config->nmodule_search_path, config->module_search_paths));
+    SET_ITEM("executable",
+             FROM_WSTRING(config->executable));
+    SET_ITEM("prefix",
+             FROM_WSTRING(config->prefix));
+    SET_ITEM("base_prefix",
+             FROM_WSTRING(config->base_prefix));
+    SET_ITEM("exec_prefix",
+             FROM_WSTRING(config->exec_prefix));
+    SET_ITEM("base_exec_prefix",
+             FROM_WSTRING(config->base_exec_prefix));
+#ifdef MS_WINDOWS
+    SET_ITEM("dll_path",
+             FROM_WSTRING(config->dll_path));
+#endif
+    SET_ITEM("isolated",
+             PyLong_FromLong(config->isolated));
+    SET_ITEM("site_import",
+             PyLong_FromLong(config->site_import));
+    SET_ITEM("bytes_warning",
+             PyLong_FromLong(config->bytes_warning));
+    SET_ITEM("inspect",
+             PyLong_FromLong(config->inspect));
+    SET_ITEM("interactive",
+             PyLong_FromLong(config->interactive));
+    SET_ITEM("optimization_level",
+             PyLong_FromLong(config->optimization_level));
+    SET_ITEM("parser_debug",
+             PyLong_FromLong(config->parser_debug));
+    SET_ITEM("write_bytecode",
+             PyLong_FromLong(config->write_bytecode));
+    SET_ITEM("verbose",
+             PyLong_FromLong(config->verbose));
+    SET_ITEM("quiet",
+             PyLong_FromLong(config->quiet));
+    SET_ITEM("user_site_directory",
+             PyLong_FromLong(config->user_site_directory));
+    SET_ITEM("buffered_stdio",
+             PyLong_FromLong(config->buffered_stdio));
+    SET_ITEM("stdio_encoding",
+             FROM_STRING(config->stdio_encoding));
+    SET_ITEM("stdio_errors",
+             FROM_STRING(config->stdio_errors));
+#ifdef MS_WINDOWS
+    SET_ITEM("legacy_windows_fs_encoding",
+             PyLong_FromLong(config->legacy_windows_fs_encoding));
+    SET_ITEM("legacy_windows_stdio",
+             PyLong_FromLong(config->legacy_windows_stdio));
+#endif
+    SET_ITEM("_install_importlib",
+             PyLong_FromLong(config->_install_importlib));
+    SET_ITEM("_check_hash_pycs_mode",
+             FROM_STRING(config->_check_hash_pycs_mode));
+    SET_ITEM("_frozen",
+             PyLong_FromLong(config->_frozen));
+
+    return dict;
+
+fail:
+    Py_DECREF(dict);
+    return NULL;
+
+#undef FROM_STRING
+#undef FROM_WSTRING
+#undef SET_ITEM
+}