From 9578bfc0efe5c2d667c7336e247274f1ad8f0e25 Mon Sep 17 00:00:00 2001
From: David Cole <david.cole@kitware.com>
Date: Fri, 16 Oct 2009 11:43:05 -0400
Subject: [PATCH] Fix crash on Windows. If input stream is no good, do not try
 to read a line from it. Return false and an empty line instead...

---
 Source/kwsys/SystemTools.cxx | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index 8ed631593..3c1901863 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -3959,10 +3959,11 @@ bool SystemTools::GetLineFromStream(kwsys_ios::istream& is,
   line = "";
 
   long leftToRead = sizeLimit;
-  
+
   // If no characters are read from the stream, the end of file has
   // been reached.  Clear the fail bit just before reading.
-  while(!haveNewline &&
+  while(is &&
+        !haveNewline &&
         leftToRead != 0 &&
         (is.clear(is.rdstate() & ~kwsys_ios::ios::failbit),
          is.getline(buffer, bufferSize), is.gcount() > 0))