[PATCH] libstdc++/71038 fix error checks in filesystem::copy_file

[Jonathan Wakely]

This is a very silly error, but only shows up when
!_GLIBCXX_USE_SENDFILE so I missed it.

        PR libstdc++/71038
        * src/filesystem/ops.cc (do_copy_file): Fix backwards conditions.
        * testsuite/experimental/filesystem/operations/copy_file.cc: New test.

Tested x86_64-linux and x86_64-freebsd10, committed to trunk.
Backports to follow.


commit c94a04d90e6aaef58c9940ad529e8f9c8d8040f6
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Tue May 10 16:27:15 2016 +0100

    libstdc++/71038 fix error checks in filesystem::copy_file
    
        PR libstdc++/71038
        * src/filesystem/ops.cc (do_copy_file): Fix backwards conditions.
        * testsuite/experimental/filesystem/operations/copy_file.cc: New test.

diff --git a/libstdc++-v3/src/filesystem/ops.cc 
b/libstdc++-v3/src/filesystem/ops.cc
index fab4235..5b82088 100644
--- a/libstdc++-v3/src/filesystem/ops.cc
+++ b/libstdc++-v3/src/filesystem/ops.cc
@@ -450,7 +450,7 @@ namespace
        ec = std::make_error_code(std::errc::io_error);
        return false;
       }
-    if (sbout.close() || sbin.close())
+    if (!sbout.close() || !sbin.close())
       {
        ec.assign(errno, std::generic_category());
        return false;
diff --git 
a/libstdc++-v3/testsuite/experimental/filesystem/operations/copy_file.cc 
b/libstdc++-v3/testsuite/experimental/filesystem/operations/copy_file.cc
new file mode 100644
index 0000000..cdb7911
--- /dev/null
+++ b/libstdc++-v3/testsuite/experimental/filesystem/operations/copy_file.cc
@@ -0,0 +1,82 @@
+// Copyright (C) 2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++11 -lstdc++fs" }
+// { dg-require-filesystem-ts "" }
+
+// 15.4 Copy [fs.op.copy_file]
+
+#include <experimental/filesystem>
+#include <fstream>
+#include <testsuite_fs.h>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = false;
+  using std::experimental::filesystem::copy_options;
+  std::error_code ec;
+
+  auto from = __gnu_test::nonexistent_path();
+  auto to = __gnu_test::nonexistent_path();
+
+  // test non-existent file
+  bool b = copy_file(from, to, ec);
+  VERIFY( !b );
+  VERIFY( ec );
+  VERIFY( !exists(to) );
+
+  // test empty file
+  std::ofstream{from.native()};
+  VERIFY( exists(from) );
+  VERIFY( file_size(from) == 0 );
+
+  b = copy_file(from, to);
+  VERIFY( b );
+  VERIFY( exists(to) );
+  VERIFY( file_size(to) == 0 );
+  remove(to);
+  VERIFY( !exists(to) );
+  b = copy_file(from, to, copy_options::none, ec);
+  VERIFY( b );
+  VERIFY( !ec );
+  VERIFY( exists(to) );
+  VERIFY( file_size(to) == 0 );
+
+  std::ofstream{from.native()} << "Hello, filesystem!";
+  VERIFY( file_size(from) != 0 );
+  remove(to);
+  VERIFY( !exists(to) );
+  b = copy_file(from, to);
+  VERIFY( b );
+  VERIFY( exists(to) );
+  VERIFY( file_size(to) == file_size(from) );
+  remove(to);
+  VERIFY( !exists(to) );
+  b = copy_file(from, to);
+  VERIFY( b );
+  VERIFY( !ec );
+  VERIFY( exists(to) );
+  VERIFY( file_size(to) == file_size(from) );
+}
+
+int
+main()
+{
+  test01();
+}