add osmo_lu_type_names[], osmo_lu_type_name()

Move lupd_names[] from osmo-msc to libosmo-gsm.

Change-Id: Ica25919758ef6cba8348da199b0ae7e0ba628798

include/osmocom/gsm/protocol/gsm_04_08.h

@@ -1652,6 +1652,10 @@ const char *gsm48_pdisc_msgtype_name(uint8_t pdisc, uint8_t msg_type);
 #define GSM48_LUPD_IMSI_ATT	0x2
 #define GSM48_LUPD_RESERVED	0x3
 
+extern const struct value_string osmo_lu_type_names[];
+static inline const char *osmo_lu_type_name(uint8_t lu_type)
+{ return get_value_string(osmo_lu_type_names, lu_type); }
+
 /* Table 10.5.4 */
 #define GSM_MI_TYPE_MASK	0x07
 #define GSM_MI_TYPE_NONE	0x00

src/gsm/gsm48.c

@@ -1137,4 +1137,12 @@ struct gsm48_hdr *gsm48_push_l3hdr(struct msgb *msg,
 	return gh;
 }
 
+const struct value_string osmo_lu_type_names[] = {
+	{ GSM48_LUPD_NORMAL, "NORMAL" },
+	{ GSM48_LUPD_PERIODIC, "PERIODIC" },
+	{ GSM48_LUPD_IMSI_ATT, "IMSI-ATTACH" },
+	{ GSM48_LUPD_RESERVED, "RESERVED" },
+	{}
+};
+
 /*! @} */

src/gsm/libosmogsm.map

@@ -555,6 +555,7 @@ sgsap_ue_emm_mode_names;
 sgsap_ie_tlvdef;
 
 osmo_rat_type_names;
+osmo_lu_type_names;
 
 local: *;
 };