ns2: Add gprs_ns2_nsvc_state_name() to get the current state of a VC

Change-Id: I4c4c5b9142d7240ed452218e263ba12e2b70d1a0
Related: SYS#4998

include/osmocom/gprs/gprs_ns2.h

@@ -192,9 +192,12 @@ struct gprs_ns2_vc *gprs_ns2_nsvc_by_sockaddr_nse(
 		struct gprs_ns2_nse *nse,
 		const struct osmo_sockaddr *sockaddr);
 void gprs_ns2_start_alive_all_nsvcs(struct gprs_ns2_nse *nse);
+
+/* VC information */
 const char *gprs_ns2_ll_str(struct gprs_ns2_vc *nsvc);
 char *gprs_ns2_ll_str_buf(char *buf, size_t buf_len, struct gprs_ns2_vc *nsvc);
 char *gprs_ns2_ll_str_c(const void *ctx, struct gprs_ns2_vc *nsvc);
+const char *gprs_ns2_nsvc_state_name(struct gprs_ns2_vc *nsvc);
 
 /* vty */
 int gprs_ns2_vty_init(struct gprs_ns2_inst *nsi,

src/gb/gprs_ns2.c

@@ -292,6 +292,14 @@ char *gprs_ns2_ll_str_c(const void *ctx, struct gprs_ns2_vc *nsvc)
 	return gprs_ns2_ll_str_buf(buf, NS2_LL_MAX_STR, nsvc);
 }
 
+/*! Return the current state name of a given NS-VC to a thread-local static buffer.
+ *  \param[in] nsvc NS-VC to return the state of
+ *  \return pointer to the string on success; NULL on error */
+const char *gprs_ns2_nsvc_state_name(struct gprs_ns2_vc *nsvc)
+{
+	return osmo_fsm_inst_state_name(nsvc->fi);
+}
+
 /*! Receive a primitive from the NS User (Gb).
  *  \param[in] nsi NS instance to which the primitive is issued
  *  \param[in] oph The primitive

src/gb/libosmogb.map

@@ -109,6 +109,7 @@ gprs_ns2_nse_nsei;
 gprs_ns2_nse_sns_remote;
 gprs_ns2_nsvc_by_nsvci;
 gprs_ns2_nsvc_by_sockaddr;
+gprs_ns2_nsvc_state_name;
 gprs_ns2_prim_strs;
 gprs_ns2_recv_prim;
 gprs_ns2_reset_persistent_nsvcs;