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-rw-r--r--butl/filesystem.cxx6
1 files changed, 5 insertions, 1 deletions
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.