From 5f432eaa2d45c139209d5a481eefccda56322ce1 Mon Sep 17 00:00:00 2001
From: Matthias Badaire <mbadaire@gmail.com>
Date: Mon, 19 Jan 2015 10:12:41 +0100
Subject: [PATCH] AP_Mount_Alexmos : take into account available negative
 numbers

uartdriver->available () function brings back a signed int, we should be carefull to avoid an endless loop if that happens.
---
 libraries/AP_Mount/AP_Mount_Alexmos.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libraries/AP_Mount/AP_Mount_Alexmos.cpp b/libraries/AP_Mount/AP_Mount_Alexmos.cpp
index a70e60ff7b..5765162176 100644
--- a/libraries/AP_Mount/AP_Mount_Alexmos.cpp
+++ b/libraries/AP_Mount/AP_Mount_Alexmos.cpp
@@ -220,6 +220,11 @@ void AP_Mount_Alexmos::read_incoming()
     int16_t numc;
 
     numc = _port->available();
+
+    if (numc < 0 ){
+        return;
+    }
+        
     for (int16_t i = 0; i < numc; i++) {        // Process bytes received
         data = _port->read();
         switch (_step) {