Issue #9425: Create run_file() subfunction

 * Call Py_MakePendingCalls() before converting the filename from
   wchar_t* to char*
 * Use PyUnicode_AsUTF8String() instead of _PyUnicode_AsString()

Modules/main.c

@@ -275,6 +275,40 @@ error:
     return 1;
 }
 
+static int
+run_file(FILE *fp, const wchar_t *filename, PyCompilerFlags *p_cf)
+{
+    PyObject *unicode, *bytes = NULL;
+    char *filename_str;
+    int run;
+
+    /* call pending calls like signal handlers (SIGINT) */
+    if (Py_MakePendingCalls() == -1) {
+        PyErr_Print();
+        return 1;
+    }
+
+    if (filename) {
+        unicode = PyUnicode_FromWideChar(filename, wcslen(filename));
+        if (unicode != NULL) {
+            bytes = PyUnicode_AsUTF8String(unicode);
+            Py_DECREF(unicode);
+        }
+        if (bytes != NULL)
+            filename_str = PyBytes_AsString(bytes);
+        else {
+            PyErr_Clear();
+            filename_str = "<decoding error>";
+        }
+    }
+    else
+        filename_str = "<stdin>";
+
+    run = PyRun_AnyFileExFlags(fp, filename_str, filename != NULL, p_cf);
+    Py_XDECREF(bytes);
+    return run != 0;
+}
+
 
 /* Main program */
 
@@ -644,30 +678,8 @@ Py_Main(int argc, wchar_t **argv)
             }
         }
 
-        if (sts==-1) {
-            PyObject *filenameObj = NULL;
-            char *p_cfilename = "<stdin>";
-            if (filename) {
-                filenameObj = PyUnicode_FromWideChar(
-                    filename, wcslen(filename));
-                if (filenameObj != NULL)
-                    p_cfilename = _PyUnicode_AsString(filenameObj);
-                else
-                    p_cfilename = "<decoding error>";
-            }
-            /* call pending calls like signal handlers (SIGINT) */
-            if (Py_MakePendingCalls() == -1) {
-                PyErr_Print();
-                sts = 1;
-            } else {
-                sts = PyRun_AnyFileExFlags(
-                    fp,
-                    p_cfilename,
-                    filename != NULL, &cf) != 0;
-            }
-            Py_XDECREF(filenameObj);
-        }
-
+        if (sts == -1)
+            sts = run_file(fp, filename, &cf);
     }
 
     /* Check this environment variable at the end, to give programs the