+/**
+ * Get the API version of the specified decoder.
+ *
+ * @param d The decoder to use. Must not be NULL.
+ *
+ * @return The API version of the decoder, or 0 upon errors.
+ *
+ * @private
+ */
+SRD_PRIV long srd_decoder_apiver(const struct srd_decoder *d)
+{
+ PyObject *py_apiver;
+ long apiver;
+ PyGILState_STATE gstate;
+
+ if (!d)
+ return 0;
+
+ gstate = PyGILState_Ensure();
+
+ py_apiver = PyObject_GetAttrString(d->py_dec, "api_version");
+ apiver = (py_apiver && PyLong_Check(py_apiver))
+ ? PyLong_AsLong(py_apiver) : 0;
+ Py_XDECREF(py_apiver);
+
+ PyGILState_Release(gstate);
+
+ return apiver;
+}
+
+static gboolean contains_duplicates(GSList *list)
+{
+ for (GSList *l1 = list; l1; l1 = l1->next) {
+ for (GSList *l2 = l1->next; l2; l2 = l2->next)
+ if (!strcmp(l1->data, l2->data))
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+static gboolean contains_duplicate_ids(GSList *list1, GSList *list2)
+{
+ for (GSList *l1 = list1; l1; l1 = l1->next) {
+ unsigned int cnt = 0;
+ const char **s1 = l1->data;
+ for (GSList *l2 = list2; l2; l2 = l2->next) {
+ const char **s2 = l2->data;
+ if (!strcmp(s1[0], s2[0]))
+ cnt++;
+ if ((list1 == list2) && cnt > 1)
+ return TRUE;
+ if ((list1 != list2) && cnt > 0)
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+
+static gboolean contains_duplicate_row_ids(GSList *list1, GSList *list2)
+{
+ for (GSList *l1 = list1; l1; l1 = l1->next) {
+ unsigned int cnt = 0;
+ const struct srd_decoder_annotation_row *r1 = l1->data;
+ for (GSList *l2 = list2; l2; l2 = l2->next) {
+ const struct srd_decoder_annotation_row *r2 = l2->data;
+ if (!strcmp(r1->id, r2->id))
+ cnt++;
+ if (cnt > 1)
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+