Description: Fix PyIOBase_Type

Author: Thomas Andrejak <thomas.andrejak@gmail.com>

Last-Update: 2021-08-13

--- libprelude-5.2.0/bindings/python/libpreludecpp-python.i	2020-09-09 16:30:32.510000000 +0200

+++ libprelude-5.2.0/bindings/python/libpreludecpp-python.i	2021-08-13 23:20:11.672221930 +0200

@@ -163,6 +163,26 @@

         $1 = _cb_python_log;

 };

+%{

+static PyObject *PyIOBase_TypeObj;

+

+static int init_file_emulator(void)

+{

+    PyObject *io = PyImport_ImportModule("_io");

+    if (io == NULL)

+        return -1;

+    PyIOBase_TypeObj = PyObject_GetAttrString(io, "_IOBase");

+    if (PyIOBase_TypeObj == NULL)

+        return -1;

+    return 0;

+}

+%}

+

+%init %{

+if (init_file_emulator() < 0) {

+    return NULL;

+}

+%}

 /* tell swig not to cast void * value */

 %typemap(in) void *nocast_file_p %{

@@ -172,8 +192,7 @@

         }

 #else

-        extern PyTypeObject PyIOBase_Type;

-        if ( ! PyObject_IsInstance((PyObject *) $input, (PyObject *) &PyIOBase_Type) ) {

+        if ( ! PyObject_IsInstance((PyObject *) $input, PyIOBase_TypeObj) ) {

                 SWIG_exception_fail(SWIG_RuntimeError, "Argument is not a file object");

         }

 #endif

@@ -186,8 +205,7 @@

 #if PY_VERSION_HEX < 0x03000000

         $1 = PyFile_Check((PyObject *) $input);

 #else

-        extern PyTypeObject PyIOBase_Type;

-        $1 = PyObject_IsInstance((PyObject *) $input, (PyObject *) &PyIOBase_Type);

+        $1 = PyObject_IsInstance((PyObject *) $input, PyIOBase_TypeObj);

 #endif

 %}