--- /dev/null
+// 2003-05-03 Petur Runolfsson <peturr02@ru.is>
+
+// Copyright (C) 2003, 2009 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <locale>
+#include <fstream>
+#include <cctype>
+#include <testsuite_hooks.h>
+
+class Cvt_to_upper : public std::codecvt<char, char, std::mbstate_t>
+{
+ typedef std::codecvt<char, char, std::mbstate_t> Base;
+
+public:
+ explicit Cvt_to_upper(std::size_t refs = 0)
+ : Base(refs)
+ { }
+
+protected:
+ virtual result
+ do_in(state_type&,
+ const extern_type* from, const extern_type* from_end,
+ const extern_type*& from_next,
+ intern_type* to, intern_type* to_end,
+ intern_type*& to_next) const
+ {
+ while (from < from_end && to < to_end)
+ *to++ = std::toupper(*from++);
+
+ to_next = to;
+ from_next = from;
+ return from == from_end ? ok : partial;
+ }
+
+ virtual bool
+ do_always_noconv() const throw()
+ {
+ return false;
+ }
+};
+
+// libstdc++/9027
+void test01()
+{
+ using namespace std;
+
+ bool test __attribute__((unused)) = true;
+ const char* name = "filebuf_virtuals-1.txt";
+ locale loc (locale::classic(), new Cvt_to_upper);
+
+ filebuf fbin;
+ fbin.pubimbue(loc);
+ fbin.open(name, ios_base::in);
+
+ int c;
+ while ((c = fbin.sbumpc()) != EOF)
+ {
+ VERIFY( !islower(c) );
+ }
+
+ fbin.close();
+}
+
+int main()
+{
+ test01();
+ return 0;
+}