isisd: fix 'show isis route' and 'show isis fast-reroute summary' err…

…ors with vrf

When the VRF does not exist, the command will display results for the 'default' VRF.
1.before the commit:
sonic# show vrf
vrf Vrf1 id 41 table 1001
sonic# show isis vrf abc route level-1
Area 10:
IS-IS L1 IPv4 routing table:

Prefix          Metric  Interface  Nexthop   Label(s)
-------------------------------------------------------
0.0.0.0/0       5       Ethernet0  10.1.1.2  -
6.6.6.6/32      10      -          -         -

sonic# show isis vrf abc fast-reroute summary level-1
Area 10:
IS-IS L1 IPv4 Fast ReRoute summary:

Protection \ Priority     Critical  High      Medium    Low       Total
--------------------------------------------------------------------------
Classic LFA               0         0         2         3         5
Remote LFA                0         0         0         0         0
Topology Independent LFA  0         0         0         0         0
ECMP                      0         0         0         0         0
Unprotected               0         0         2         2         4
Protection coverage       0.00%     0.00%     50.00%    60.00%    55.56%

2.after the commit:
sonic# show vrf
vrf Vrf1 id 41 table 1001
sonic# show isis vrf abc route level-1
sonic# show isis vrf abc fast-reroute summary level-1

What I do:
    Move 'ISIS_FIND_VRF_ARGS(argv, argc, idx, vrf_name, all_vrf);' to the front, otherwise changing 'idx' while searching for other parameters may result in failing to find the vrf parameter.

Signed-off-by: baozhen-H3C <[email protected]>

isisd/isis_spf.c

@@ -3258,6 +3258,7 @@ DEFUN(show_isis_route, show_isis_route_cmd,
 	json_object *json = NULL, *json_vrf = NULL;
 	uint8_t algorithm = SR_ALGORITHM_SPF;
 
+	ISIS_FIND_VRF_ARGS(argv, argc, idx, vrf_name, all_vrf);
 	if (argv_find(argv, argc, "level-1", &idx))
 		levels = ISIS_LEVEL1;
 	else if (argv_find(argv, argc, "level-2", &idx))
@@ -3269,7 +3270,6 @@ DEFUN(show_isis_route, show_isis_route_cmd,
 		vty_out(vty, "IS-IS Routing Process not enabled\n");
 		return CMD_SUCCESS;
 	}
-	ISIS_FIND_VRF_ARGS(argv, argc, idx, vrf_name, all_vrf);
 
 	if (argv_find(argv, argc, "prefix-sid", &idx))
 		prefix_sid = true;
@@ -3520,6 +3520,7 @@ DEFUN(show_isis_frr_summary, show_isis_frr_summary_cmd,
 	bool all_vrf = false;
 	int idx = 0;
 
+	ISIS_FIND_VRF_ARGS(argv, argc, idx, vrf_name, all_vrf);
 	if (argv_find(argv, argc, "level-1", &idx))
 		levels = ISIS_LEVEL1;
 	else if (argv_find(argv, argc, "level-2", &idx))
@@ -3531,7 +3532,6 @@ DEFUN(show_isis_frr_summary, show_isis_frr_summary_cmd,
 		vty_out(vty, "IS-IS Routing Process not enabled\n");
 		return CMD_SUCCESS;
 	}
-	ISIS_FIND_VRF_ARGS(argv, argc, idx, vrf_name, all_vrf);
 
 	if (all_vrf) {
 		for (ALL_LIST_ELEMENTS_RO(im->isis, node, isis))