From 17b788efc7262ebae17d3ab4c46c723c45cba884 Mon Sep 17 00:00:00 2001
From: Nick Foster <nick@ettus.com>
Date: Tue, 14 Aug 2012 09:27:34 -0700
Subject: [PATCH] Possible fix for the hang bug -- preamble could under certain
 circumstances consume -1, which makes Gnuradio think we're done.

---
 lib/air_modes_preamble.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/air_modes_preamble.cc b/lib/air_modes_preamble.cc
index 8046d78..6bcf2e6 100644
--- a/lib/air_modes_preamble.cc
+++ b/lib/air_modes_preamble.cc
@@ -157,7 +157,7 @@ int air_modes_preamble::general_work(int noutput_items,
 
 			//be sure we've got enough room in the input buffer to copy out a whole packet
 			if(ninputs-i < 240*d_samples_per_chip) {
-				consume_each(i-1);
+				consume_each(std::max(i-1,0));
 				return 0;
 			}