move to libxsc: factor out gen of USSD notify and release complete

Both libmsc and libbsc will need distinct gsm0480_send_ussdNotify() and
gsm0480_send_releaseComplete() functions, since there will be distinct
subscriber connection structs.

The current functions live in libmsc, so add the same in libbsc in new file
gsm_04_80_utils.c.

To avoid too much code dup, move the message generation part of
gsm0480_send_ussdNotify() and gsm0480_send_releaseComplete() to new functions
gsm0480_gen_ussdNotify() and gsm0480_gen_releaseComplete(), placed in libxsc.

Change-Id: I33a84e3c28576ced91d2ea24103123431f551173

1 files changed, 36 insertions, 0 deletions

diff --git a/openbsc/src/libxsc/xsc.c b/openbsc/src/libxsc/xsc.c
index 138be1134..04bc53e1b 100644
--- a/openbsc/src/libxsc/xsc.c
+++ b/openbsc/src/libxsc/xsc.c
@@ -113,3 +113,39 @@ struct msgb *gsm48_create_loc_upd_rej(uint8_t cause)
 	gh->data[0] = cause;
 	return msg;
 }
+
+struct msgb *gsm0480_gen_ussdNotify(int level, const char *text)
+{
+	struct gsm48_hdr *gh;
+	struct msgb *msg;
+
+	msg = gsm0480_create_unstructuredSS_Notify(level, text);
+	if (!msg)
+		return NULL;
+
+	gsm0480_wrap_invoke(msg, GSM0480_OP_CODE_USS_NOTIFY, 0);
+	gsm0480_wrap_facility(msg);
+
+	/* And finally pre-pend the L3 header */
+	gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
+	gh->proto_discr = GSM48_PDISC_NC_SS;
+	gh->msg_type = GSM0480_MTYPE_REGISTER;
+
+	return msg;
+}
+
+struct msgb *gsm0480_gen_releaseComplete(void)
+{
+	struct gsm48_hdr *gh;
+	struct msgb *msg;
+
+	msg = gsm48_msgb_alloc_name("GSM 04.08 USSD REL COMPL");
+	if (!msg)
+		return NULL;
+
+	gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
+	gh->proto_discr = GSM48_PDISC_NC_SS;
+	gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE;
+
+	return msg;
+}