--- /dev/null
+// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 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 <fstream>
+#include <testsuite_hooks.h>
+#include <testsuite_io.h>
+
+// @require@ %-*.tst %-*.txt
+// @diff@ %-*.tst %*.txt
+
+const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
+
+void test05()
+{
+ using namespace std;
+ using namespace __gnu_test;
+
+ typedef filebuf::int_type int_type;
+ typedef filebuf::traits_type traits_type;
+
+ bool test __attribute__((unused)) = true;
+ int_type c3;
+
+ // int_type sputc(char_type c)
+ // if out_cur not avail, return overflow(traits_type::to_int_type(c))
+ // else, stores c at out_cur,
+ // increments out_cur, and returns c as int_type
+
+ // in
+ {
+ constraint_filebuf fb_01;
+ fb_01.pubsetbuf(0, 0);
+ fb_01.open(name_01, ios_base::in);
+ VERIFY( fb_01.unbuffered() );
+ c3 = fb_01.sputc('a');
+ VERIFY( c3 == traits_type::eof() );
+ VERIFY( fb_01.unbuffered() );
+ }
+}
+
+int main()
+{
+ test05();
+ return 0;
+}