gh-107954, PEP 741: Add PyConfig_Get()/Set() functions (#123472)

Add PyConfig_Get(), PyConfig_GetInt(), PyConfig_Set() and
PyConfig_Names() functions to get and set the current runtime Python
configuration.

Add visibility and "sys spec" to config and preconfig specifications.

_PyConfig_AsDict() now converts PyConfig.xoptions as a dictionary.

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

2 files changed, 69 insertions, 0 deletions

diff --git a/Modules/_testcapi/config.c b/Modules/_testcapi/config.c
new file mode 100644
index 0000000..bb3b7e8
--- /dev/null
+++ b/Modules/_testcapi/config.c
@@ -0,0 +1,68 @@
+#include "parts.h"
+
+
+static PyObject *
+_testcapi_config_get(PyObject *module, PyObject *name_obj)
+{
+    const char *name;
+    if (PyArg_Parse(name_obj, "s", &name) < 0) {
+        return NULL;
+    }
+
+    return PyConfig_Get(name);
+}
+
+
+static PyObject *
+_testcapi_config_getint(PyObject *module, PyObject *name_obj)
+{
+    const char *name;
+    if (PyArg_Parse(name_obj, "s", &name) < 0) {
+        return NULL;
+    }
+
+    int value;
+    if (PyConfig_GetInt(name, &value) < 0) {
+        return NULL;
+    }
+    return PyLong_FromLong(value);
+}
+
+
+static PyObject *
+_testcapi_config_names(PyObject *module, PyObject* Py_UNUSED(args))
+{
+    return PyConfig_Names();
+}
+
+
+static PyObject *
+_testcapi_config_set(PyObject *module, PyObject *args)
+{
+    const char *name;
+    PyObject *value;
+    if (PyArg_ParseTuple(args, "sO", &name, &value) < 0) {
+        return NULL;
+    }
+
+    int res = PyConfig_Set(name, value);
+    if (res < 0) {
+        return NULL;
+    }
+    Py_RETURN_NONE;
+}
+
+
+static PyMethodDef test_methods[] = {
+    {"config_get", _testcapi_config_get, METH_O},
+    {"config_getint", _testcapi_config_getint, METH_O},
+    {"config_names", _testcapi_config_names, METH_NOARGS},
+    {"config_set", _testcapi_config_set, METH_VARARGS},
+    {NULL}
+};
+
+int
+_PyTestCapi_Init_Config(PyObject *mod)
+{
+    return PyModule_AddFunctions(mod, test_methods);
+}
diff --git a/Modules/_testcapi/parts.h b/Modules/_testcapi/parts.h
index 41d1909..65ba775 100644
--- a/Modules/_testcapi/parts.h
+++ b/Modules/_testcapi/parts.h
@@ -60,5 +60,6 @@ int _PyTestCapi_Init_Hash(PyObject *module);
 int _PyTestCapi_Init_Time(PyObject *module);
 int _PyTestCapi_Init_Monitoring(PyObject *module);
 int _PyTestCapi_Init_Object(PyObject *module);
+int _PyTestCapi_Init_Config(PyObject *mod);
 
 #endif // Py_TESTCAPI_PARTS_H