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ss7_vty: Improve VTY output of vty_dump_rtable()

This same outputting hint is used by Cisco ITP.

Change-Id: I87511084278976889ab031fcfd10c09cc60c7595
---
M src/ss7_vty.c
1 file changed, 6 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-sigtran refs/changes/50/40550/1

diff --git a/src/ss7_vty.c b/src/ss7_vty.c
index a5f5310..563dd97 100644
--- a/src/ss7_vty.c
+++ b/src/ss7_vty.c
@@ -517,9 +517,13 @@
 
 		llist_for_each_entry(rt, &clset->routes, list) {
 			bool rt_avail = ss7_route_is_available(rt);
-
+			bool first_rt_in_clset = (rt == llist_first_entry(&clset->routes, struct osmo_ss7_route, list));
+			/* Print route str only in first rt in combined linkset.
+			 * This allows users to easily determine visually combined
+			 * linksets: */
+			const char *rt_str = first_rt_in_clset ? osmo_ss7_route_print(rt) : "";
 			vty_out(vty, "%-16s %-5s %c %c %u %-19s %-7s %-7s %-7s%-3s%s",
-				osmo_ss7_route_print(rt),
+				rt_str,
 				rt_avail ? "acces" : "INACC",
 				' ',
 				'0' + rt->cfg.qos_class,

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