--- /dev/null
+// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003, 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <sstream>
+#include <testsuite_hooks.h>
+
+class OverBuf : public std::wstringbuf
+{
+public:
+ int_type pub_overflow(int_type c = traits_type::eof())
+ { return std::wstringbuf::overflow(c); }
+};
+
+// libstdc++/9988
+// filebuf::overflow writes EOF to file
+void test15()
+{
+ using namespace std;
+ bool test __attribute__((unused)) = true;
+
+ OverBuf sb;
+
+ sb.sputc(L'a');
+ sb.pub_overflow(L'b');
+ sb.pub_overflow();
+ sb.sputc(L'c');
+
+ wstringbuf sbin(sb.str(), ios_base::in);
+ wstringbuf::int_type c;
+ c = sbin.sbumpc();
+ VERIFY( c == L'a' );
+ c = sbin.sbumpc();
+ VERIFY( c == L'b' );
+ c = sbin.sbumpc();
+ VERIFY( c == L'c' );
+ c = sbin.sbumpc();
+ VERIFY( c == wstringbuf::traits_type::eof() );
+}
+
+int main()
+{
+ test15();
+ return 0;
+}