huawei: always parse operator name in +COPS responses as ASCII

Despite +CSCS? may claim supporting UCS2, Huawei modems always report
the oerator name in ASCII in a +COPS response. This patch addresses that
by always assuming the charset is IRA when parsing the operator name in a
+COPS response.

plugins/huawei/mm-broadband-modem-huawei.c

@@ -1780,6 +1780,47 @@ modem_3gpp_disable_unsolicited_events (MMIfaceModem3gpp *self,
         result);
 }
 
+/*****************************************************************************/
+/* Operator Name loading (3GPP interface) */
+
+static gchar *
+modem_3gpp_load_operator_name_finish (MMIfaceModem3gpp *self,
+                                      GAsyncResult *res,
+                                      GError **error)
+{
+    const gchar *result;
+    gchar *operator_name;
+
+    result = mm_base_modem_at_command_finish (MM_BASE_MODEM (self), res, error);
+    if (!result)
+        return NULL;
+
+    /* Despite +CSCS? may claim supporting UCS2, Huawei modems always report the
+     * operator name in ASCII in a +COPS response. Thus, we ignore the current
+     * charset claimed by the modem and assume the charset is IRA when parsing
+     * the operator name.
+     */
+    operator_name = mm_3gpp_parse_operator (result, MM_MODEM_CHARSET_IRA);
+    if (operator_name)
+        mm_dbg ("loaded Operator Name: %s", operator_name);
+
+    return operator_name;
+}
+
+static void
+modem_3gpp_load_operator_name (MMIfaceModem3gpp *self,
+                               GAsyncReadyCallback callback,
+                               gpointer user_data)
+{
+    mm_dbg ("loading Operator Name (huawei)...");
+    mm_base_modem_at_command (MM_BASE_MODEM (self),
+                              "+COPS=3,0;+COPS?",
+                              3,
+                              FALSE,
+                              callback,
+                              user_data);
+}
+
 /*****************************************************************************/
 /* Create Bearer (Modem interface) */
 
@@ -3037,6 +3078,8 @@ iface_modem_3gpp_init (MMIfaceModem3gpp *iface)
     iface->enable_unsolicited_events_finish = modem_3gpp_enable_unsolicited_events_finish;
     iface->disable_unsolicited_events = modem_3gpp_disable_unsolicited_events;
     iface->disable_unsolicited_events_finish = modem_3gpp_disable_unsolicited_events_finish;
+    iface->load_operator_name = modem_3gpp_load_operator_name;
+    iface->load_operator_name_finish = modem_3gpp_load_operator_name_finish;
 }
 
 static void