--- /dev/null
+// 2004-10-01 Paolo Carlini <pcarlini@suse.de>
+
+// Copyright (C) 2004, 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/>.
+
+// 27.7.1.3 Overridden virtual functions [lib.stringbuf.virtuals]
+
+#include <sstream>
+#include <testsuite_hooks.h>
+
+class my_stringbuf : public std::stringbuf
+{
+public:
+ my_stringbuf(const std::string& str, std::ios_base::openmode mode)
+ : std::stringbuf(str, mode) { }
+
+ int_type
+ pub_pbackfail(int_type c)
+ { return this->pbackfail(c); }
+};
+
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+ using namespace std;
+
+ typedef my_stringbuf::int_type int_type;
+ typedef my_stringbuf::traits_type traits_type;
+
+ my_stringbuf sbuf("any", ios_base::in | ios_base::out);
+
+ int_type c = sbuf.sgetc();
+ VERIFY( c == 'a' );
+
+ c = sbuf.pub_pbackfail('z');
+ VERIFY( c == traits_type::eof() );
+ c = sbuf.sbumpc();
+ VERIFY( c == 'a' );
+
+ c = sbuf.pub_pbackfail('a');
+ VERIFY( c == 'a' );
+ c = sbuf.sbumpc();
+ VERIFY( c == 'a' );
+
+ c = sbuf.pub_pbackfail('x');
+ VERIFY( c == 'x' );
+ c = sbuf.sbumpc();
+ VERIFY( c == 'x' );
+
+ const int_type eof = traits_type::eof();
+ c = sbuf.pub_pbackfail(eof);
+ VERIFY( c == traits_type::not_eof(eof) );
+ c = sbuf.sgetc();
+ VERIFY( c == 'x' );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}