From c8bfe83e55cf008554161ab69a7545775e14c10d Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Wed, 13 Aug 2014 16:46:20 -0700
Subject: Suggested fix to allow .constr files to have empty lines.

---
 src/map/scl/sclUtil.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/map/scl/sclUtil.c b/src/map/scl/sclUtil.c
index 2c71b739..b6bfebe4 100644
--- a/src/map/scl/sclUtil.c
+++ b/src/map/scl/sclUtil.c
@@ -218,6 +218,8 @@ void Abc_SclReadTimingConstr( Abc_Frame_t * pAbc, char * pFileName, int fVerbose
     while ( fgets( Buffer, 1000, pFile ) )
     {
         pToken = strtok( Buffer, " \t\r\n" );
+        if ( pToken == NULL )
+            continue;
         if ( !strcmp(pToken, "set_driving_cell") )
         {
             Abc_FrameSetDrivingCell( Abc_UtilStrsav(strtok(NULL, " \t\r\n")) );
-- 
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