From d80532de0bd9b17c9d0eb5086ac3de00d982d812 Mon Sep 17 00:00:00 2001
From: regehr <regehr>
Date: Tue, 24 Jun 2008 15:34:39 +0000
Subject: [PATCH] deal with malformed input a bit better

---
 tools/tinyos/safe/tos-decode-flid | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/tinyos/safe/tos-decode-flid b/tools/tinyos/safe/tos-decode-flid
index 62893cb2..5dab226a 100755
--- a/tools/tinyos/safe/tos-decode-flid
+++ b/tools/tinyos/safe/tos-decode-flid
@@ -12,6 +12,11 @@ sub decode ($$) {
     return $h;
 }
 
+sub usage() {
+    print "Usage: tos-decode-flid flid flid-file\n";
+    exit 2;
+}
+
 sub make_flid () {
 
     my $flid = $ARGV[0];
@@ -25,6 +30,8 @@ sub make_flid () {
 	decode(substr($flid,6,1),substr($flid,7,1));
 }
 
+usage() if (scalar(@ARGV)!=2);
+
 my $flidstr = make_flid();
 
 my $fn = $ARGV[1];
@@ -60,8 +67,7 @@ if (defined ($fn)) {
     close INF;
 }
 else {
-    print "Usage: tos-decode-flid flid flid-file\n";
-    exit 2;
+    usage();
 }
 
 if (!$found) {
-- 
2.39.2