+/* A helper function which returns a documentation string for an
+ object. */
+
+static char *
+get_doc_string (PyObject *object, PyObject *attr)
+{
+ char *result = NULL;
+
+ if (PyObject_HasAttr (object, attr))
+ {
+ PyObject *ds_obj = PyObject_GetAttr (object, attr);
+
+ if (ds_obj && gdbpy_is_string (ds_obj))
+ {
+ result = python_string_to_host_string (ds_obj);
+ if (result == NULL)
+ gdbpy_print_stack ();
+ }
+ Py_XDECREF (ds_obj);
+ }
+ if (! result)
+ result = xstrdup (_("This command is not documented."));
+ return result;
+}
+
+/* Helper function which will execute a METHOD in OBJ passing the
+ argument ARG. ARG can be NULL. METHOD should return a Python
+ string. If this function returns NULL, there has been an error and
+ the appropriate exception set. */
+static char *
+call_doc_function (PyObject *obj, PyObject *method, PyObject *arg)
+{
+ char *data = NULL;
+ PyObject *result = PyObject_CallMethodObjArgs (obj, method, arg, NULL);
+
+ if (! result)
+ return NULL;
+
+ if (gdbpy_is_string (result))
+ {
+ data = python_string_to_host_string (result);
+ if (! data)
+ return NULL;
+ }
+ else
+ {
+ PyErr_SetString (PyExc_RuntimeError,
+ _("Parameter must return a string value."));
+ return NULL;
+ }
+
+ return data;
+}
+
+/* A callback function that is registered against the respective
+ add_setshow_* set_doc prototype. This function will either call
+ the Python function "get_set_string" or extract the Python
+ attribute "set_doc" and return the contents as a string. If
+ neither exist, insert a string indicating the Parameter is not
+ documented. */
+static void
+get_set_value (char *args, int from_tty,
+ struct cmd_list_element *c)
+{
+ PyObject *obj = (PyObject *) get_cmd_context (c);
+ char *set_doc_string;
+ struct cleanup *cleanup = ensure_python_env (get_current_arch (),
+ current_language);
+ PyObject *set_doc_func = PyString_FromString ("get_set_string");
+
+ if (! set_doc_func)
+ goto error;
+
+ make_cleanup_py_decref (set_doc_func);
+
+ if (PyObject_HasAttr (obj, set_doc_func))
+ {
+ set_doc_string = call_doc_function (obj, set_doc_func, NULL);
+ if (! set_doc_string)
+ goto error;
+ }
+ else
+ {
+ /* We have to preserve the existing < GDB 7.3 API. If a
+ callback function does not exist, then attempt to read the
+ set_doc attribute. */
+ set_doc_string = get_doc_string (obj, set_doc_cst);
+ }
+
+ make_cleanup (xfree, set_doc_string);
+ fprintf_filtered (gdb_stdout, "%s\n", set_doc_string);
+
+ do_cleanups (cleanup);
+ return;
+
+ error:
+ gdbpy_print_stack ();
+ do_cleanups (cleanup);
+ return;
+}
+
+/* A callback function that is registered against the respective
+ add_setshow_* show_doc prototype. This function will either call
+ the Python function "get_show_string" or extract the Python
+ attribute "show_doc" and return the contents as a string. If
+ neither exist, insert a string indicating the Parameter is not
+ documented. */
+static void
+get_show_value (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c,
+ const char *value)
+{
+ PyObject *obj = (PyObject *) get_cmd_context (c);
+ char *show_doc_string = NULL;
+ struct cleanup *cleanup = ensure_python_env (get_current_arch (),
+ current_language);
+ PyObject *show_doc_func = PyString_FromString ("get_show_string");
+
+ if (! show_doc_func)
+ goto error;
+
+ make_cleanup_py_decref (show_doc_func);
+
+ if (PyObject_HasAttr (obj, show_doc_func))
+ {
+ PyObject *val_obj = PyString_FromString (value);
+
+ if (! val_obj)
+ goto error;
+
+ make_cleanup_py_decref (val_obj);
+
+ show_doc_string = call_doc_function (obj, show_doc_func, val_obj);
+ if (! show_doc_string)
+ goto error;
+
+ make_cleanup (xfree, show_doc_string);
+
+ fprintf_filtered (file, "%s\n", show_doc_string);
+ }
+ else
+ {
+ /* We have to preserve the existing < GDB 7.3 API. If a
+ callback function does not exist, then attempt to read the
+ show_doc attribute. */
+ show_doc_string = get_doc_string (obj, show_doc_cst);
+ make_cleanup (xfree, show_doc_string);
+ fprintf_filtered (file, "%s %s\n", show_doc_string, value);
+ }
+
+ do_cleanups (cleanup);
+ return;
+
+ error:
+ gdbpy_print_stack ();
+ do_cleanups (cleanup);
+ return;
+}