From e59571ffcdcd942874f3fa8199c880b114d874f9 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 2 Aug 2016 13:56:20 +0200
Subject: Check for eof before streaming rdbuf

---
 bpkg/checksum.cxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'bpkg/checksum.cxx')

diff --git a/bpkg/checksum.cxx b/bpkg/checksum.cxx
index 023e641..3f52204 100644
--- a/bpkg/checksum.cxx
+++ b/bpkg/checksum.cxx
@@ -330,7 +330,12 @@ namespace bpkg
       ifdstream is (pr.in_ofd, fdstream_mode::skip);
       ofdstream os (pr.out_fd);
 
-      os << &sb;
+      // Note that the eof check is important: if the stream is at eof, write
+      // will fail.
+      //
+      if (sb.sgetc () != ifdstream::traits_type::eof ())
+        os << &sb;
+
       os.close ();
 
       // All three tools output the sum as the first word.
-- 
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