From 2a8177b5f51b6a930491bc50fb90d7eb9a8c6577 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 2 Aug 2016 13:42:26 +0200
Subject: Check for eof before streaming rdbuf

---
 butl/filesystem.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'butl')

diff --git a/butl/filesystem.cxx b/butl/filesystem.cxx
index 4aa2078..3249b58 100644
--- a/butl/filesystem.cxx
+++ b/butl/filesystem.cxx
@@ -248,7 +248,11 @@ namespace butl
 
     // Throws ios::failure on fdbuf read/write failures.
     //
-    ofs << ifs.rdbuf ();
+    // Note that the eos check is important: if the stream is at eos (empty
+    // file) then this write will fail.
+    //
+    if (ifs.peek () != ifdstream::traits_type::eof ())
+      ofs << ifs.rdbuf ();
 
     ifs.close (); // Throws ios::failure on failure.
     ofs.close (); // Throws ios::failure on flush/close failure.
-- 
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