--- /dev/null
+// { dg-require-namedlocale "" }
+
+// 2003-09-04 Petur Runolfsson <peturr02@ru.is>
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation
+//
+// 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 <cstdio>
+#include <testsuite_hooks.h>
+
+// Test that unbuffered really means unbuffered for UTF-8
+void test05()
+{
+ using namespace std;
+ bool test __attribute__((unused)) = true;
+ const char* name = "tmp_underflow-5";
+
+ wfilebuf fb;
+ fb.pubsetbuf(0, 0);
+ fb.pubimbue(locale("se_NO.UTF-8"));
+
+ FILE* file = fopen(name, "w");
+ setvbuf(file, 0, _IONBF, 0);
+ fputs("abcde", file);
+
+ fb.open(name, ios_base::in);
+ VERIFY( fb.sbumpc() == L'a' );
+
+ fseek(file, 1, SEEK_SET);
+ fputc('0', file);
+
+ VERIFY( fb.sbumpc() == L'0' );
+ VERIFY( fb.sbumpc() == L'c' );
+
+ fputc('1', file);
+ fputc('2', file);
+
+ VERIFY( fb.sbumpc() == L'2' );
+ VERIFY( fb.sbumpc() == L'e' );
+ VERIFY( fb.sbumpc() == WEOF );
+
+ fputc('3', file);
+ fputc('4', file);
+
+ VERIFY( fb.sbumpc() == L'4' );
+ VERIFY( fb.sbumpc() == WEOF );
+
+ fb.close();
+ fclose(file);
+}
+
+int main()
+{
+ test05();
+ return 0;
+}