From 8a7678a8dc3736b50351ea89e838405a158092db Mon Sep 17 00:00:00 2001
From: Masaki Muranaka <monaka@monami-ya.jp>
Date: Wed, 5 Sep 2012 03:10:11 +0900
Subject: Print usage in case using -o without outputfile.

---
 tools/xpcat/xpcat.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/xpcat/xpcat.c b/tools/xpcat/xpcat.c
index ce3d5854e..20528c20d 100644
--- a/tools/xpcat/xpcat.c
+++ b/tools/xpcat/xpcat.c
@@ -26,8 +26,10 @@ main(int argc, char *argv[])
       i++;
       if (i < argc)
         output = argv[i];
-      else
+      else {
+        usage(argv[0]);
         return EXIT_FAILURE;
+      }
     }
   }
 
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