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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/1-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/1-io.cc
new file mode 100644
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+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/1-io.cc
@@ -0,0 +1,123 @@
+// 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
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <testsuite_hooks.h>
+#include <testsuite_io.h>
+
+// @require@ %-*.tst %-*.txt
+// @diff@ %-*.tst %*.txt
+
+const char name_01[] = "seekoff-1io.tst";
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::pos_type 	pos_type;
+  typedef filebuf::off_type 	off_type;
+
+  bool test __attribute__((unused)) = true;
+  streamsize 			strmsz_1, strmsz_2;
+
+  int_type c1;
+  int_type c2;
+  int_type c3;
+
+  pos_type pt_1(off_type(-1));
+  pos_type pt_2(off_type(0));
+  off_type off_1 = 0;
+  off_type off_2 = 0;
+
+  // seekoff
+  // pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which)
+  // alters the stream position to off
+
+  // in | out
+  {
+    constraint_filebuf fb;
+    fb.open(name_01, ios_base::out | ios_base::in);
+    VERIFY( !fb.write_position() );
+    VERIFY( !fb.read_position() );
+
+    //beg
+    strmsz_1 = fb.in_avail(); 
+    pt_1 = fb.pubseekoff(2, ios_base::beg);
+    strmsz_2 = fb.in_avail(); 
+    off_1 = off_type(pt_1);
+    VERIFY( off_1 > 0 );
+    c1 = fb.snextc(); //current in pointer +1
+    VERIFY( c1 == '9' );
+    fb.pubseekoff(3, ios_base::beg);
+    c2 = fb.sputc('\n');  //current in pointer +1
+    fb.pubseekoff(4, ios_base::beg);
+    c3 = fb.sgetc();
+    VERIFY( c2 != c3 ); 
+    VERIFY( c3 == '9' );
+    fb.pubsync(); 
+    c1 = fb.sgetc();
+    VERIFY( c1 == c3 );
+
+    //cur
+    pt_2 = fb.pubseekoff(2, ios_base::cur);
+    off_2 = off_type(pt_2);
+    VERIFY( (off_2 == (off_1 + 2 + 1 + 1)) );
+    c1 = fb.snextc(); //current in pointer +1
+    VERIFY( c1 == '1' );
+    fb.pubseekoff(0, ios_base::cur);
+    c2 = fb.sputc('x');  //test current out pointer
+    c3 = fb.sputc('\n');
+    fb.pubseekoff(0, ios_base::cur);
+    c1 = fb.sgetc();
+    fb.pubsync(); 
+    c3 = fb.sgetc();
+    VERIFY( c1 == c3 );
+
+    //end
+    pt_2 = fb.pubseekoff(0, ios_base::end);
+    off_1 = off_type(pt_2);
+    VERIFY( off_1 > off_2 ); //weak, but don't know exactly where it ends
+    c3 = fb.sputc('\n');
+    strmsz_1 = fb.sputn("because because because. . .", 28);  
+    VERIFY( strmsz_1 == 28 );
+    fb.pubseekoff(-1, ios_base::end);
+    fb.sgetc();
+    c1 = fb.sungetc();
+    // Defect?  retval of sungetc is not necessarily the character ungotten.
+    // So re-get it.
+    c1 = fb.sgetc();
+    fb.pubsync(); 
+    c3 = fb.sgetc();
+    VERIFY( c1 == c3 );
+    VERIFY( !fb.write_position() );
+    VERIFY( fb.read_position() );
+  }
+}
+
+int main() 
+{
+  test05();
+  return 0;
+}