From e629181f5a91a933bb96feaa1189481c81fa55ac Mon Sep 17 00:00:00 2001
From: Martin Holst Swende <martin@swende.se>
Date: Thu, 22 Jan 2015 21:04:16 +0100
Subject: [PATCH] Fixed issue where -1 size_t was returned

---
 client/graph.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/client/graph.c b/client/graph.c
index 269c2dd9..94d6054f 100644
--- a/client/graph.c
+++ b/client/graph.c
@@ -66,7 +66,7 @@ void setGraphBuf(uint8_t *buff, size_t size)
 }
 size_t getFromGraphBuf(uint8_t *buff)
 {
-	if ( buff == NULL ) return -1;
+	if ( buff == NULL ) return 0;
 	
   uint32_t i;
   for (i=0;i<GraphTraceLen;++i){
@@ -89,7 +89,7 @@ int GetClock(const char *str, int peak, int verbose)
 	{
 		uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
 		size_t size = getFromGraphBuf(grph);
-		if ( size < 0 ) {
+		if ( size == 0 ) {
 			PrintAndLog("Failed to copy from graphbuffer");
 			return -1;
 		}
@@ -146,6 +146,10 @@ int GetNRZpskClock(const char *str, int peak, int verbose)
 	{
 		uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
 		size_t size = getFromGraphBuf(grph);
+		if ( size == 0 ) {
+			PrintAndLog("Failed to copy from graphbuffer");
+			return -1;
+		}
 		clock = DetectpskNRZClock(grph,size,0);
 		// Only print this message if we're not looping something
 		if (!verbose){
-- 
2.39.2