From 26b87c8c557972f4f942b9cb8baaf2f25d5b7b84 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Fri, 6 Jan 2012 01:36:08 +0700
Subject: Added warning when the network from file has no primary inputs.

---
 src/base/io/io.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/base/io/io.c')

diff --git a/src/base/io/io.c b/src/base/io/io.c
index 3d1a6ae3..2ed4b3b2 100644
--- a/src/base/io/io.c
+++ b/src/base/io/io.c
@@ -200,6 +200,11 @@ int IoCommandRead( Abc_Frame_t * pAbc, int argc, char ** argv )
     pNtk = Io_Read( pFileName, Io_ReadFileType(pFileName), fCheck );
     if ( pNtk == NULL )
         return 0;
+    if ( Abc_NtkPiNum(pNtk) == 0 )
+    {
+        Abc_Print( 0, "The new network has no primary inputs. It is recommended\n" );
+        Abc_Print( 1, "to add a dummy PI to make sure all commands work correctly.\n" );
+    }
     // replace the current network
     Abc_FrameReplaceCurrentNetwork( pAbc, pNtk );
     Abc_FrameCopyLTLDataBase( pAbc, pNtk );
-- 
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