2003-06-05 Benjamin Kosnik <bkoz@redhat.com>

	PR libstdc++/9024
	* include/bits/fstream.tcc (_M_underflow): Fix for unbuffered.
	* include/bits/stl_algobase.h: Tweak.
	* include/std/std_fstream.h: Move _M_buf_size to...
	* include/std/std_streambuf.h: ...here. Modify.
	* include/bits/streambuf.tcc: Same.
	* testsuite/testsuite_hooks.h: Tweak.
	* testsuite/testsuite_io.h (constraint_filebuf): New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sbumpc/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sgetc/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sgetn/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/2.cc: Split into...
	* testsuite/27_io/basic_filebuf/sgetn/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/3.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/snextc/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sputc/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/2.cc: Split into...
	* testsuite/27_io/basic_filebuf/sputc/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sputn/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/2-out.cc: New.
	* testsuite/data/sgetc.txt: New.
	* testsuite/data/sgetn.txt: New.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@67524 138bc75d-0d04-0410-961f-82ee72b054a4

48 files changed, 2949 insertions, 843 deletions

diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1-in.cc
new file mode 100644
index 00000000000..e03da5f2064
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1-in.cc
@@ -0,0 +1,79 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  // int_type sbumpc()
+  // if read_cur not avail returns uflow(), else return *read_cur & increment
+
+  // in 
+  {
+    constraint_filebuf fb_01; 
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( !fb_01.write_position() );
+
+    int_type c1 = fb_01.sbumpc();
+    VERIFY( c1 == '/' );
+    int_type c3 = fb_01.sbumpc();
+    VERIFY( c3 == '/' );
+
+    c1 = fb_01.sgetc();
+    int_type c2 = fb_01.sbumpc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == ' ' );
+    VERIFY( c3 == '9' );
+    VERIFY( c1 == c2 );
+    VERIFY( c2 != c3 );
+
+    c1 = fb_01.sbumpc();
+    c2 = fb_01.sbumpc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == '9' );
+    VERIFY( c2 == '9' );
+    VERIFY( c3 == '0' );
+
+    VERIFY( !fb_01.write_position() );
+    VERIFY( fb_01.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1-io.cc
new file mode 100644
index 00000000000..9098a2083e7
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1-io.cc
@@ -0,0 +1,92 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+const char name_03[] = "tmp_sbumpc_1io.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  // int_type sbumpc()
+  // if read_cur not avail returns uflow(), else return *read_cur & increment
+
+  // in | out 1
+  {
+    constraint_filebuf fb_03; 
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc); 
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+    int_type c5 = fb_03.sbumpc();
+    VERIFY( c5 == traits_type::eof() );
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+  }
+
+  // in | out 2
+  {
+    constraint_filebuf fb_01; 
+    fb_01.open(name_01, ios_base::in | ios_base::out);
+    VERIFY( fb_01.write_position() );
+
+     int_type c1 = fb_01.sbumpc();
+    VERIFY( c1 == '/' );
+    int_type c3 = fb_01.sbumpc();
+    VERIFY( c3 == '/' );
+
+    c1 = fb_01.sgetc();
+    int_type c2 = fb_01.sbumpc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == ' ' );
+    VERIFY( c3 == '9' );
+    VERIFY( c1 == c2 );
+    VERIFY( c2 != c3 );
+
+    c1 = fb_01.sbumpc();
+    c2 = fb_01.sbumpc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == '9' );
+    VERIFY( c2 == '9' );
+    VERIFY( c3 == '0' );
+
+    VERIFY( fb_01.write_position() );
+    VERIFY( fb_01.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1-out.cc
new file mode 100644
index 00000000000..ff0cb97dd5d
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1-out.cc
@@ -0,0 +1,63 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sbumpc_1out.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  // int_type sbumpc()
+  // if read_cur not avail returns uflow(), else return *read_cur & increment
+
+  // out
+  {
+    constraint_filebuf fb_02; 
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+    int_type c2 = fb_02.sbumpc();
+    VERIFY( c2 == traits_type::eof() );
+    int_type c4 = fb_02.sbumpc();
+    VERIFY( c4 == traits_type::eof() );
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1.cc
deleted file mode 100644
index d2c7ccd53b4..00000000000
--- a/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1.cc
+++ /dev/null
@@ -1,106 +0,0 @@
-// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
-
-// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
-
-// 27.8.1.4 Overridden virtual functions
-
-#include <fstream>
-#include <testsuite_hooks.h>
-
-// @require@ %-*.tst %-*.txt
-// @diff@ %-*.tst %*.txt
-
-// NB: This test assumes that _M_buf_size == 40, and not the usual
-// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
-// simulated a bit more readily.
-// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
-const int buffer_size = 8192;
-//const int buffer_size = 40;
-
-const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
-const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
-const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
-
-class derived_filebuf: public std::filebuf
-{
- public:
-  void
-  set_size(int_type __size) { _M_buf_size = __size; }
-};
-
-derived_filebuf fb_01; // in 
-derived_filebuf fb_02; // out
-derived_filebuf fb_03; // in | out
-
-// Initialize filebufs to be the same size regardless of platform.
-void test03()
-{
-  fb_01.set_size(buffer_size);
-  fb_02.set_size(buffer_size);
-  fb_03.set_size(buffer_size);
-}
-
-// Test overloaded virtual functions.
-void test05() 
-{
-  using namespace std;
-  typedef filebuf::int_type 	int_type;
-  typedef filebuf::traits_type 	traits_type;
-  typedef filebuf::pos_type 	pos_type;
-  typedef filebuf::off_type 	off_type;
-  typedef size_t 			size_type;
-
-  bool 					test = true;
-  filebuf 				f_tmp;
-  streamsize 			strmsz_1, strmsz_2;
-  streamoff  			strmof_1, strmof_2;
-  int 					i = 0, j = 0, k = 0;
-
-  // GET
-  fb_01.open(name_01, ios_base::in);
-  fb_02.open(name_02, ios_base::out | ios_base::trunc);
-  fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc); 
-  strmof_1 = fb_01.in_avail();
-  strmof_2 = fb_02.in_avail();
-  strmof_1 = fb_03.in_avail(); 
-
-  // int_type sbumpc()
-  // if read_cur not avail returns uflow(), else return *read_cur & increment
-  int_type c1 = fb_01.sbumpc();
-  int_type c2 = fb_02.sbumpc();
-  VERIFY( c1 != c2 );
-  VERIFY( c1 == '/' );
-  VERIFY( c2 == -1 );
-  int_type c3 = fb_01.sbumpc();
-  int_type c4 = fb_02.sbumpc();
-  VERIFY( c3 != c4 );
-  VERIFY( c1 == c3 ); // fluke, both happen to be '/'
-  VERIFY( c2 == c4 );
-  int_type c5 = fb_03.sbumpc();
-  VERIFY( c5 == traits_type::eof() );
-  // XXX should do some kind of test to make sure that internal
-  // buffers point to the same thing, to check consistancy.
-}
-
-main() 
-{
-  test03();
-  test05();
-  return 0;
-}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/2-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/2-in.cc
new file mode 100644
index 00000000000..d0f256ee10c
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/2-in.cc
@@ -0,0 +1,79 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  // int_type sbumpc()
+  // if read_cur not avail returns uflow(), else return *read_cur & increment
+
+  // in 
+  {
+    constraint_filebuf fb_01; 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( fb_01.unbuffered() );
+
+    int_type c1 = fb_01.sbumpc();
+    VERIFY( c1 == '/' );
+    int_type c3 = fb_01.sbumpc();
+    VERIFY( c3 == '/' );
+
+    c1 = fb_01.sgetc();
+    int_type c2 = fb_01.sbumpc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == ' ' );
+    VERIFY( c3 == '9' );
+    VERIFY( c1 == c2 );
+    VERIFY( c2 != c3 );
+
+    c1 = fb_01.sbumpc();
+    c2 = fb_01.sbumpc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == '9' );
+    VERIFY( c2 == '9' );
+    VERIFY( c3 == '0' );
+
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/2-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/2-io.cc
new file mode 100644
index 00000000000..ef1f28f786e
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/2-io.cc
@@ -0,0 +1,91 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+const char name_03[] = "tmp_sbumpc_2io.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  // int_type sbumpc()
+  // if read_cur not avail returns uflow(), else return *read_cur & increment
+
+  // in | out 1
+  {
+    constraint_filebuf fb_03;
+    fb_03.pubsetbuf(0, 0); 
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc); 
+    VERIFY( fb_03.unbuffered() );
+    int_type c5 = fb_03.sbumpc();
+    VERIFY( c5 == traits_type::eof() );
+    VERIFY( fb_03.unbuffered() );
+  }
+
+  // in | out 2
+  {
+    constraint_filebuf fb_01; 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios_base::in | ios_base::out);
+    VERIFY( fb_01.unbuffered() );
+
+    int_type c1 = fb_01.sbumpc();
+    VERIFY( c1 == '/' );
+    int_type c3 = fb_01.sbumpc();
+    VERIFY( c3 == '/' );
+
+    c1 = fb_01.sgetc();
+    int_type c2 = fb_01.sbumpc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == ' ' );
+    VERIFY( c3 == '9' );
+    VERIFY( c1 == c2 );
+    VERIFY( c2 != c3 );
+
+    c1 = fb_01.sbumpc();
+    c2 = fb_01.sbumpc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == '9' );
+    VERIFY( c2 == '9' );
+    VERIFY( c3 == '0' );
+
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/2-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/2-out.cc
new file mode 100644
index 00000000000..1d8df086bcc
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/2-out.cc
@@ -0,0 +1,64 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sbumpc_2out.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  // int_type sbumpc()
+  // if read_cur not avail returns uflow(), else return *read_cur & increment
+
+  // out
+  {
+    constraint_filebuf fb_02; 
+    fb_02.pubsetbuf(0, 0);
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+    int_type c2 = fb_02.sbumpc();
+    VERIFY( c2 == traits_type::eof() );
+    int_type c4 = fb_02.sbumpc();
+    VERIFY( c4 == traits_type::eof() );
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-in.cc
new file mode 100644
index 00000000000..7ae7cdccee4
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-in.cc
@@ -0,0 +1,71 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef std::filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 		traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type sgetc()
+  // if read_cur not avail, return uflow(), else return *read_cur  
+
+  // in
+  {
+    constraint_filebuf fb_01; // in 
+    fb_01.open(name_01, ios::in);
+    VERIFY( !fb_01.write_position() );
+    c1 = fb_01.sgetc();
+    VERIFY( c1 == '/' );
+    c2 = fb_01.sgetc();
+    VERIFY( c1 == c2 );
+    fb_01.sbumpc();
+    c1 = fb_01.sbumpc();
+    c2 = fb_01.sgetc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == '/' );
+    VERIFY( c2 == ' ' );
+    VERIFY( c3 == ' ' );
+    VERIFY( !fb_01.write_position() );
+    VERIFY( fb_01.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-io.cc
new file mode 100644
index 00000000000..6882234f1d5
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-io.cc
@@ -0,0 +1,86 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+const char name_03[] = "tmp_sgetc_1io.tst"; // empty file, need to create
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef std::filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 		traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type sgetc()
+  // if read_cur not avail, return uflow(), else return *read_cur  
+
+  // in | out 1
+  {
+    constraint_filebuf fb_03; // in | out
+    fb_03.open(name_03, ios::out | ios::in | ios::trunc); 
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+    c1 = fb_03.sgetc();
+    c2 = fb_03.sbumpc();
+    VERIFY( c1 == traits_type::eof() );
+    VERIFY( c1 == c2 );
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+  }
+
+  // in | out 2
+  {
+    constraint_filebuf fb_01; // in 
+    fb_01.open(name_01, ios::in | ios::out);
+    VERIFY( fb_01.write_position() );
+    c1 = fb_01.sgetc();
+    VERIFY( c1 == '/' );
+    c2 = fb_01.sgetc();
+    VERIFY( c1 == c2 );
+    fb_01.sbumpc();
+    c1 = fb_01.sbumpc();
+    c2 = fb_01.sgetc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == '/' );
+    VERIFY( c2 == ' ' );
+    VERIFY( c3 == ' ' );
+    VERIFY( fb_01.write_position() );
+    VERIFY( fb_01.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-out.cc
new file mode 100644
index 00000000000..30d4d1b5e40
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-out.cc
@@ -0,0 +1,69 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sgetc_1out.tst"; // empty file, need to create
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef std::filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 		traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type sgetc()
+  // if read_cur not avail, return uflow(), else return *read_cur  
+
+  // out
+  {
+    constraint_filebuf fb_02; // out
+    fb_02.open(name_02, ios::out | ios::trunc);    
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+    c1 = fb_02.sgetc();
+    VERIFY( c1 == traits_type::eof() );
+    c2 = fb_02.sgetc();
+    VERIFY( c2 == traits_type::eof() );
+    fb_02.sbumpc();
+    c1 = fb_02.sbumpc();
+    c2 = fb_02.sgetc();
+    VERIFY( c1 == c2 );
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1.cc
deleted file mode 100644
index 37573c8edfd..00000000000
--- a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1.cc
+++ /dev/null
@@ -1,107 +0,0 @@
-// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
-
-// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
-
-// 27.8.1.4 Overridden virtual functions
-
-#include <fstream>
-#include <testsuite_hooks.h>
-
-// @require@ %-*.tst %-*.txt
-// @diff@ %-*.tst %*.txt
-
-// NB: This test assumes that _M_buf_size == 40, and not the usual
-// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
-// simulated a bit more readily.
-// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
-const int buffer_size = 8192;
-//const int buffer_size = 40;
-
-const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
-const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
-const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
-
-class derived_filebuf: public std::filebuf
-{
- public:
-  void
-  set_size(int_type __size) { _M_buf_size = __size; }
-};
-
-derived_filebuf fb_01; // in 
-derived_filebuf fb_02; // out
-derived_filebuf fb_03; // in | out
-
-// Initialize filebufs to be the same size regardless of platform.
-void test03()
-{
-  fb_01.set_size(buffer_size);
-  fb_02.set_size(buffer_size);
-  fb_03.set_size(buffer_size);
-}
-
-// Test overloaded virtual functions.
-void test05() 
-{
-  typedef std::filebuf::int_type 	int_type;
-  typedef std::filebuf::traits_type 	traits_type;
-  typedef std::filebuf::pos_type 	pos_type;
-  typedef std::filebuf::off_type 	off_type;
-  typedef size_t 			size_type;
-
-  bool 					test = true;
-  std::filebuf 				f_tmp;
-  std::streamsize 			strmsz_1, strmsz_2;
-  std::streamoff  			strmof_1, strmof_2;
-  int 					i = 0, j = 0, k = 0;
-
-  // GET
-  fb_01.open(name_01, std::ios_base::in);
-  fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
-  fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc); 
-  strmof_1 = fb_01.in_avail();
-  strmof_2 = fb_02.in_avail();
-  strmof_1 = fb_03.in_avail(); 
-
-  int_type c1 = fb_01.sbumpc();
-  int_type c2 = fb_02.sbumpc();
-  int_type c3 = fb_01.sbumpc();
-  int_type c4 = fb_02.sbumpc();
-  int_type c5 = fb_03.sbumpc();
-
-  // int_type sgetc()
-  // if read_cur not avail, return uflow(), else return *read_cur  
-  int_type c6 = fb_01.sgetc();
-  int_type c7 = fb_02.sgetc();
-  VERIFY( c6 != c3 );
-  VERIFY( c7 == c4 ); // both -1
-  int_type c8 = fb_01.sgetc();
-  int_type c9 = fb_02.sgetc();
-  VERIFY( c6 == c8 );
-  VERIFY( c7 == c9 );
-  c5 = fb_03.sgetc();
-  VERIFY( c5 == traits_type::eof() );
-}
-
-main() 
-{
-  test03();
-  test05();
-  return 0;
-}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/2-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/2-in.cc
new file mode 100644
index 00000000000..979a3fd3845
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/2-in.cc
@@ -0,0 +1,71 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef std::filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 		traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type sgetc()
+  // if read_cur not avail, return uflow(), else return *read_cur  
+
+  // in
+  {
+    constraint_filebuf fb_01; // in 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios::in);
+    VERIFY( fb_01.unbuffered() );
+    c1 = fb_01.sgetc();
+    VERIFY( c1 == '/' );
+    c2 = fb_01.sgetc();
+    VERIFY( c1 == c2 );
+    fb_01.sbumpc();
+    c1 = fb_01.sbumpc();
+    c2 = fb_01.sgetc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == '/' );
+    VERIFY( c2 == ' ' );
+    VERIFY( c3 == ' ' );
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/2-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/2-io.cc
new file mode 100644
index 00000000000..e12ef3455cd
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/2-io.cc
@@ -0,0 +1,85 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+const char name_03[] = "tmp_sgetc_2io.tst"; // empty file, need to create
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef std::filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 		traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type sgetc()
+  // if read_cur not avail, return uflow(), else return *read_cur  
+
+  // in | out 1
+  {
+    constraint_filebuf fb_03; // in | out
+    fb_03.pubsetbuf(0, 0);
+    fb_03.open(name_03, ios::out | ios::in | ios::trunc); 
+    VERIFY( fb_03.unbuffered() );
+    c1 = fb_03.sgetc();
+    c2 = fb_03.sbumpc();
+    VERIFY( c1 == traits_type::eof() );
+    VERIFY( c1 == c2 );
+    VERIFY( fb_03.unbuffered() );
+  }
+
+  // in | out 2
+  {
+    constraint_filebuf fb_01; // in 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios::in | ios::out);
+    VERIFY( fb_01.unbuffered() );
+    c1 = fb_01.sgetc();
+    VERIFY( c1 == '/' );
+    c2 = fb_01.sgetc();
+    VERIFY( c1 == c2 );
+    fb_01.sbumpc();
+    c1 = fb_01.sbumpc();
+    c2 = fb_01.sgetc();
+    c3 = fb_01.sgetc();
+    VERIFY( c1 == '/' );
+    VERIFY( c2 == ' ' );
+    VERIFY( c3 == ' ' );
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/2-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/2-out.cc
new file mode 100644
index 00000000000..491c028c281
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/2-out.cc
@@ -0,0 +1,70 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sgetc_2out.tst"; // empty file, need to create
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef std::filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 		traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type sgetc()
+  // if read_cur not avail, return uflow(), else return *read_cur  
+
+  // out
+  {
+    constraint_filebuf fb_02; // out
+    fb_02.pubsetbuf(0, 0);
+    fb_02.open(name_02, ios::out | ios::trunc);    
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+    c1 = fb_02.sgetc();
+    VERIFY( c1 == traits_type::eof() );
+    c2 = fb_02.sgetc();
+    VERIFY( c2 == traits_type::eof() );
+    fb_02.sbumpc();
+    c1 = fb_02.sbumpc();
+    c2 = fb_02.sgetc();
+    VERIFY( c1 == c2 );
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-in.cc
new file mode 100644
index 00000000000..021a1c89d68
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-in.cc
@@ -0,0 +1,83 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetn.txt"; // file with data in it
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  streamsize 			strmsz_1, strmsz_2, strmsz_3;
+  int 					i = 0, j = 0, k = 0;
+  char carray1[13] = "";
+  char carray2[8192] = "";
+  int_type 			c1, c2, c3, c4;
+  
+  // streamsize sgetn(char_type *s, streamsize n)
+  // streamsize xsgetn(char_type *s, streamsize n)
+  // assign up to n chars to s from input sequence, indexing in_cur as
+  // approp and returning the number of chars assigned
+
+  // in 
+  {
+    constraint_filebuf fb_01; 
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( !fb_01.write_position() );
+    strmsz_1 = fb_01.in_avail(); // 8261
+    strmsz_2 = fb_01.sgetn(carray1, 10);
+    VERIFY( strmsz_2 == 10 );
+    strmsz_2 = fb_01.in_avail(); 
+    VERIFY( strmsz_1 > strmsz_2 );
+    c1 = fb_01.sgetc();
+    VERIFY( c1 == 'b' );  
+    strmsz_1 = fb_01.in_avail();
+    strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
+    VERIFY( strmsz_1 == strmsz_2 - 5 ); 
+    c4 = fb_01.sgetc(); // buffer should have underflowed from above.
+    VERIFY( c4 == 'h' );
+    strmsz_1 = fb_01.in_avail();
+    VERIFY( strmsz_1 > 0 );
+    strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
+    VERIFY( strmsz_1 == strmsz_2 ); //at the end of the actual file 
+    VERIFY( !fb_01.write_position() );
+    VERIFY( !fb_01.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-io.cc
new file mode 100644
index 00000000000..432ed6cdab5
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-io.cc
@@ -0,0 +1,96 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetn.txt"; // file with data in it
+const char name_03[] = "tmp_sgetn_1io.tst"; // empty file, need to create
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  streamsize 			strmsz_1, strmsz_2, strmsz_3;
+  int 					i = 0, j = 0, k = 0;
+  char carray1[13] = "";
+  char carray2[8192] = "";
+  int_type 			c1, c2, c3, c4;
+  
+  // streamsize sgetn(char_type *s, streamsize n)
+  // streamsize xsgetn(char_type *s, streamsize n)
+  // assign up to n chars to s from input sequence, indexing in_cur as
+  // approp and returning the number of chars assigned
+
+  // in | out 1
+  {
+    constraint_filebuf fb_03; 
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc); 
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+    strmsz_1 = fb_03.sgetn(carray1, 10);
+    VERIFY( strmsz_1 == 0 ); 
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+  }
+
+  // in | out 2
+  {
+    constraint_filebuf fb_01; 
+    fb_01.open(name_01, ios_base::in | ios_base::out);
+    VERIFY( fb_01.write_position() );
+    strmsz_1 = fb_01.in_avail();
+    strmsz_2 = fb_01.sgetn(carray1, 10);
+    VERIFY( strmsz_2 == 10 );
+    strmsz_2 = fb_01.in_avail(); 
+    VERIFY( strmsz_1 > strmsz_2 );
+    c1 = fb_01.sgetc();
+    VERIFY( c1 == 'b' );  
+    strmsz_1 = fb_01.in_avail();
+    strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
+    VERIFY( strmsz_1 == strmsz_2 - 5 ); 
+    c4 = fb_01.sgetc(); // buffer should have underflowed from above.
+    VERIFY( c4 == 'h' );
+    strmsz_1 = fb_01.in_avail();
+    VERIFY( strmsz_1 > 0 );
+    strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
+    VERIFY( strmsz_1 == strmsz_2 ); //at the end of the actual file 
+    VERIFY( fb_01.write_position() );
+    VERIFY( !fb_01.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-out.cc
new file mode 100644
index 00000000000..dcefe01c6a1
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-out.cc
@@ -0,0 +1,79 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sgetn_1out.tst"; // empty file, need to create
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  streamsize 			strmsz_1, strmsz_2, strmsz_3;
+  int 					i = 0, j = 0, k = 0;
+  char carray1[13] = "";
+  char carray2[8192] = "";
+  int_type 			c1, c2, c3, c4;
+  
+  // streamsize sgetn(char_type *s, streamsize n)
+  // streamsize xsgetn(char_type *s, streamsize n)
+  // assign up to n chars to s from input sequence, indexing in_cur as
+  // approp and returning the number of chars assigned
+
+  // out
+  {
+    constraint_filebuf fb_02; 
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+    strmsz_2 = fb_02.in_avail();
+    strmsz_2 = fb_02.sgetn(carray2, 10);
+    VERIFY( strmsz_2 == 0 );
+    c2 = fb_02.sgetc();
+    VERIFY( c2 == traits_type::eof() );
+    strmsz_1 = fb_02.in_avail();
+    strmsz_2 = fb_02.sgetn(carray2, strmsz_1 + 5);
+    VERIFY( strmsz_1 == -1 );
+    VERIFY( strmsz_2 == 0 );
+    c4 = fb_02.sgetc(); 
+    VERIFY( c4 == traits_type::eof() );
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1.cc
deleted file mode 100644
index d890f3e7dcf..00000000000
--- a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1.cc
+++ /dev/null
@@ -1,148 +0,0 @@
-// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
-
-// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
-
-// 27.8.1.4 Overridden virtual functions
-
-#include <fstream>
-#include <testsuite_hooks.h>
-
-// @require@ %-*.tst %-*.txt
-// @diff@ %-*.tst %*.txt
-
-// NB: This test assumes that _M_buf_size == 40, and not the usual
-// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
-// simulated a bit more readily.
-// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
-const int buffer_size = 8192;
-//const int buffer_size = 40;
-
-const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
-const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
-const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
-
-class derived_filebuf: public std::filebuf
-{
- public:
-  void
-  set_size(int_type __size) { _M_buf_size = __size; }
-};
-
-derived_filebuf fb_01; // in 
-derived_filebuf fb_02; // out
-derived_filebuf fb_03; // in | out
-
-// Initialize filebufs to be the same size regardless of platform.
-void test03()
-{
-  fb_01.set_size(buffer_size);
-  fb_02.set_size(buffer_size);
-  fb_03.set_size(buffer_size);
-}
-
-// Test overloaded virtual functions.
-void test05() 
-{
-  using namespace std;
-  typedef filebuf::int_type 	int_type;
-  typedef filebuf::traits_type 	traits_type;
-  typedef filebuf::pos_type 	pos_type;
-  typedef filebuf::off_type 	off_type;
-  typedef size_t 			size_type;
-
-  bool 					test = true;
-  filebuf 				f_tmp;
-  streamsize 			strmsz_1, strmsz_2;
-  streamoff  			strmof_1, strmof_2;
-  int 					i = 0, j = 0, k = 0;
-
-  // GET
-  fb_01.open(name_01, ios_base::in);
-  fb_02.open(name_02, ios_base::out | ios_base::trunc);
-  fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc); 
-
-  strmof_1 = fb_01.in_avail();
-  int_type c1 = fb_01.sbumpc();
-  int_type c3 = fb_01.sbumpc();
-  int_type c6 = fb_01.sgetc();
-  int_type c8 = fb_01.sgetc();
-
-  strmof_2 = fb_02.in_avail();
-  int_type c2 = fb_02.sbumpc();
-  int_type c4 = fb_02.sbumpc();
-  int_type c7 = fb_02.sgetc();
-  int_type c9 = fb_02.sgetc();
-
-  strmof_1 = fb_03.in_avail(); 
-  int_type c5 = fb_03.sbumpc();
-  c5 = fb_03.sgetc();
-
-  // int_type snextc()
-  // calls sbumpc and if sbumpc != eof, return sgetc
-  c6 = fb_01.snextc();
-  c6 = fb_01.snextc();
-
-  c7 = fb_02.snextc();
-  c7 = fb_02.snextc();
-
-  c5 = fb_03.snextc();
-
-  // streamsize sgetn(char_type *s, streamsize n)
-  // streamsize xsgetn(char_type *s, streamsize n)
-  // assign up to n chars to s from input sequence, indexing in_cur as
-  // approp and returning the number of chars assigned
-  strmsz_1 = fb_01.in_avail();
-  strmsz_2 = fb_02.in_avail();
-  test = strmsz_1 != strmsz_2;
-  char carray1[13] = "";
-  strmsz_1 = fb_01.sgetn(carray1, 10);
-  char carray2[buffer_size] = "";
-  strmsz_2 = fb_02.sgetn(carray2, 10);
-  VERIFY( strmsz_1 != strmsz_2 );
-  VERIFY( strmsz_1 == 10 );
-  VERIFY( strmsz_2 == 0 );
-  c1 = fb_01.sgetc();
-  c2 = fb_02.sgetc();
-  VERIFY( c1 == '\n' );  
-  VERIFY( c7 == c2 ); // n != i
-  strmsz_1 = fb_03.sgetn(carray1, 10);
-  VERIFY( !strmsz_1 ); //zero
-  strmsz_1 = fb_01.in_avail(); // N.B.: _M_in_end - _M_in_beg == BUFSIZ - 1
-  strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
-  VERIFY( strmsz_1 == strmsz_2 - 5 ); 
-  c4 = fb_01.sgetc(); // buffer should have underflowed from above.
-  VERIFY( c4 == 'h' );
-  strmsz_1 = fb_01.in_avail();
-  VERIFY( strmsz_1 > 0 );
-  strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
-  VERIFY( strmsz_1 == strmsz_2 ); //at the end of the actual file 
-  strmsz_1 = fb_02.in_avail();
-  strmsz_2 = fb_02.sgetn(carray2, strmsz_1 + 5);
-  VERIFY( strmsz_1 == -1 );
-  VERIFY( strmsz_2 == 0 );
-  c4 = fb_02.sgetc(); // should be EOF
-  VERIFY( c4 == traits_type::eof() );
-}
-
-main() 
-{
-  test03();
-  test05();
-  return 0;
-}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-in.cc
new file mode 100644
index 00000000000..62c5a0f93f0
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-in.cc
@@ -0,0 +1,83 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetn.txt"; // file with data in it
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  streamsize 			strmsz_1, strmsz_2, strmsz_3;
+  int 					i = 0, j = 0, k = 0;
+  char carray1[13] = "";
+  char carray2[8192] = "";
+  int_type 			c1, c2, c3, c4;
+  
+  // streamsize sgetn(char_type *s, streamsize n)
+  // streamsize xsgetn(char_type *s, streamsize n)
+  // assign up to n chars to s from input sequence, indexing in_cur as
+  // approp and returning the number of chars assigned
+
+  // in 
+  {
+    constraint_filebuf fb_01; 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( fb_01.unbuffered() );
+    strmsz_1 = fb_01.in_avail();
+    strmsz_2 = fb_01.sgetn(carray1, 10);
+    VERIFY( strmsz_2 == 10 );
+    strmsz_2 = fb_01.in_avail(); 
+    VERIFY( strmsz_1 > strmsz_2 );
+    c1 = fb_01.sgetc();
+    VERIFY( c1 == 'b' );  
+    strmsz_1 = fb_01.in_avail(); // 8181 or 8250 depending on buffer
+    strmsz_2 = fb_01.sgetn(carray2, 8181 + 5);
+    VERIFY( 8181 == strmsz_2 - 5 ); 
+    c4 = fb_01.sgetc(); // buffer should have underflowed from above.
+    VERIFY( c4 == 'h' );
+    strmsz_1 = fb_01.in_avail();
+    VERIFY( strmsz_1 > 0 );
+    strmsz_2 = fb_01.sgetn(carray2, 65 + 5);
+    VERIFY( 65 == strmsz_2 ); // at the end of the actual file 
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-io.cc
new file mode 100644
index 00000000000..30ccee29f2e
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-io.cc
@@ -0,0 +1,95 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetn.txt"; // file with data in it
+const char name_03[] = "tmp_sgetn_2io.tst"; // empty file, need to create
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  streamsize 			strmsz_1, strmsz_2, strmsz_3;
+  int 					i = 0, j = 0, k = 0;
+  char carray1[13] = "";
+  char carray2[8192] = "";
+  int_type 			c1, c2, c3, c4;
+  
+  // streamsize sgetn(char_type *s, streamsize n)
+  // streamsize xsgetn(char_type *s, streamsize n)
+  // assign up to n chars to s from input sequence, indexing in_cur as
+  // approp and returning the number of chars assigned
+
+  // in | out 1
+  {
+    constraint_filebuf fb_03; 
+    fb_03.pubsetbuf(0, 0);
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc); 
+    VERIFY( fb_03.unbuffered() );
+    strmsz_1 = fb_03.sgetn(carray1, 10);
+    VERIFY( strmsz_1 == 0 ); 
+    VERIFY( fb_03.unbuffered() );
+  }
+
+  // in | out 2
+  {
+    constraint_filebuf fb_01; 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios_base::in | ios_base::out);
+    VERIFY( fb_01.unbuffered() );
+    strmsz_1 = fb_01.in_avail();
+    strmsz_2 = fb_01.sgetn(carray1, 10);
+    VERIFY( strmsz_2 == 10 );
+    strmsz_2 = fb_01.in_avail(); 
+    VERIFY( strmsz_1 > strmsz_2 );
+    c1 = fb_01.sgetc();
+    VERIFY( c1 == 'b' );  
+    strmsz_1 = fb_01.in_avail();
+    strmsz_2 = fb_01.sgetn(carray2, 8181 + 5);
+    VERIFY( 8181 == strmsz_2 - 5 ); 
+    c4 = fb_01.sgetc(); // buffer should have underflowed from above.
+    VERIFY( c4 == 'h' );
+    strmsz_1 = fb_01.in_avail();
+    VERIFY( strmsz_1 > 0 );
+    strmsz_2 = fb_01.sgetn(carray2, 65 + 5);
+    VERIFY( 65 == strmsz_2 ); //at the end of the actual file 
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-out.cc
new file mode 100644
index 00000000000..99a907493d4
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-out.cc
@@ -0,0 +1,79 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sgetn_2out.tst"; // empty file, need to create
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+
+  streamsize 			strmsz_1, strmsz_2, strmsz_3;
+  int 					i = 0, j = 0, k = 0;
+  char carray1[13] = "";
+  char carray2[8192] = "";
+  int_type 			c1, c2, c3, c4;
+  
+  // streamsize sgetn(char_type *s, streamsize n)
+  // streamsize xsgetn(char_type *s, streamsize n)
+  // assign up to n chars to s from input sequence, indexing in_cur as
+  // approp and returning the number of chars assigned
+
+  // out
+  {
+    constraint_filebuf fb_02; 
+    fb_02.pubsetbuf(0, 0);
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+    strmsz_2 = fb_02.in_avail();
+    strmsz_2 = fb_02.sgetn(carray2, 10);
+    VERIFY( strmsz_2 == 0 );
+    c2 = fb_02.sgetc();
+    VERIFY( c2 == traits_type::eof() );
+    strmsz_1 = fb_02.in_avail();
+    strmsz_2 = fb_02.sgetn(carray2, strmsz_1 + 5);
+    VERIFY( strmsz_1 == -1 );
+    VERIFY( strmsz_2 == 0 );
+    c4 = fb_02.sgetc(); 
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/3.cc
index 6ed16712b88..d3e41805938 100644
--- a/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/3.cc
@@ -23,7 +23,7 @@
 #include <fstream>
 #include <testsuite_hooks.h>
 
-const char name_01[] = "filebuf_virtuals-1.tst"; // empty file, need to create
+const char name_01[] = "sgetn.txt"; 
 
 void test06()
 {
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1-in.cc
new file mode 100644
index 00000000000..437a7fb6535
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1-in.cc
@@ -0,0 +1,84 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+const char name_02[] = "tmp_snextc_1out.tst"; // empty file, need to create
+const char name_03[] = "tmp_snextc_1io.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type snextc()
+  // calls sbumpc and if sbumpc != eof, return sgetc
+  
+  // in
+  {
+    constraint_filebuf fb_01; 
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( !fb_01.write_position() );
+    c1 = fb_01.snextc();
+    VERIFY( c1 == '/' );
+    c1 = fb_01.snextc();
+    VERIFY( c1 == ' ' );
+    VERIFY( !fb_01.write_position() );
+    VERIFY( fb_01.read_position() );
+  }
+
+  // in
+  {  
+    constraint_filebuf fb_01; 
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( !fb_01.write_position() );
+    int_type c4 = fb_01.sbumpc();
+    VERIFY( c4 == '/' );
+    c4 = fb_01.sbumpc();
+    VERIFY( c4 == '/' );
+    c4 = fb_01.sgetc();
+    VERIFY( c4 == ' ' );
+    c1 = fb_01.snextc();
+    VERIFY( c1 == '9' );
+    c4 = fb_01.sgetc();
+    VERIFY( c4 == '9' );
+    VERIFY( !fb_01.write_position() );
+    VERIFY( fb_01.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1-io.cc
new file mode 100644
index 00000000000..0627648cc7b
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1-io.cc
@@ -0,0 +1,83 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+const char name_02[] = "tmp_snextc_1out.tst"; // empty file, need to create
+const char name_03[] = "tmp_snextc_1io.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type snextc()
+  // calls sbumpc and if sbumpc != eof, return sgetc
+
+  // in | out 1
+  {
+    constraint_filebuf fb_03; 
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+    c3 = fb_03.snextc();
+    VERIFY( c3 == traits_type::eof() );
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+ }
+
+  // in | out 2
+  {  
+    constraint_filebuf fb_01; 
+    fb_01.open(name_01, ios_base::in | ios_base::out);
+    VERIFY( fb_01.write_position() );
+    int_type c4 = fb_01.sbumpc();
+    VERIFY( c4 == '/' );
+    c4 = fb_01.sbumpc();
+    VERIFY( c4 == '/' );
+    c4 = fb_01.sgetc();
+    VERIFY( c4 == ' ' );
+    c1 = fb_01.snextc();
+    VERIFY( c1 == '9' );
+    c4 = fb_01.sgetc();
+    VERIFY( c4 == '9' );
+    VERIFY( fb_01.write_position() );
+    VERIFY( fb_01.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1-out.cc
new file mode 100644
index 00000000000..d226ac29699
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1-out.cc
@@ -0,0 +1,66 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+const char name_02[] = "tmp_snextc_1out.tst"; // empty file, need to create
+const char name_03[] = "tmp_snextc_1io.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type snextc()
+  // calls sbumpc and if sbumpc != eof, return sgetc
+
+  // out
+  {    
+    constraint_filebuf fb_02;
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+    c2 = fb_02.snextc();
+    VERIFY( c2 == traits_type::eof() );
+    c2 = fb_02.snextc();
+    VERIFY( c2 == traits_type::eof() );
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1.cc
deleted file mode 100644
index fb205bd701f..00000000000
--- a/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/1.cc
+++ /dev/null
@@ -1,116 +0,0 @@
-// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
-
-// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
-
-// 27.8.1.4 Overridden virtual functions
-
-#include <fstream>
-#include <testsuite_hooks.h>
-
-// @require@ %-*.tst %-*.txt
-// @diff@ %-*.tst %*.txt
-
-// NB: This test assumes that _M_buf_size == 40, and not the usual
-// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
-// simulated a bit more readily.
-// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
-const int buffer_size = 8192;
-//const int buffer_size = 40;
-
-const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
-const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
-const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
-
-class derived_filebuf: public std::filebuf
-{
- public:
-  void
-  set_size(int_type __size) { _M_buf_size = __size; }
-};
-
-derived_filebuf fb_01; // in 
-derived_filebuf fb_02; // out
-derived_filebuf fb_03; // in | out
-
-// Initialize filebufs to be the same size regardless of platform.
-void test03()
-{
-  fb_01.set_size(buffer_size);
-  fb_02.set_size(buffer_size);
-  fb_03.set_size(buffer_size);
-}
-
-// Test overloaded virtual functions.
-void test05() 
-{
-  using namespace std;
-  typedef filebuf::int_type 	int_type;
-  typedef filebuf::traits_type 	traits_type;
-  typedef filebuf::pos_type 	pos_type;
-  typedef filebuf::off_type 	off_type;
-  typedef size_t 			size_type;
-
-  bool 					test = true;
-  filebuf 				f_tmp;
-  streamsize 			strmsz_1, strmsz_2;
-  streamoff  			strmof_1, strmof_2;
-  int 					i = 0, j = 0, k = 0;
-
-  // GET
-  fb_01.open(name_01, ios_base::in);
-  fb_02.open(name_02, ios_base::out | ios_base::trunc);
-  fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc); 
-  strmof_1 = fb_01.in_avail();
-  strmof_2 = fb_02.in_avail();
-  strmof_1 = fb_03.in_avail(); 
-
-  int_type c1 = fb_01.sbumpc();
-  int_type c2 = fb_02.sbumpc();
-  int_type c3 = fb_01.sbumpc();
-  int_type c4 = fb_02.sbumpc();
-  int_type c5 = fb_03.sbumpc();
-
-  int_type c6 = fb_01.sgetc();
-  int_type c7 = fb_02.sgetc();
-  int_type c8 = fb_01.sgetc();
-  int_type c9 = fb_02.sgetc();
-  c5 = fb_03.sgetc();
-
-  // int_type snextc()
-  // calls sbumpc and if sbumpc != eof, return sgetc
-  c6 = fb_01.snextc();
-  c7 = fb_02.snextc();
-  VERIFY( c6 != c8 );
-  VERIFY( c7 == c9 ); // -1
-  VERIFY( c6 == '\n' );
-  c6 = fb_01.snextc();
-  c7 = fb_02.snextc();
-  VERIFY( c6 != c8 );
-  VERIFY( c7 == c9 ); // -1
-  VERIFY( c6 == '9' );
-  c5 = fb_03.snextc();
-  VERIFY( c5 == traits_type::eof() );
-}
-
-main() 
-{
-  test03();
-  test05();
-  return 0;
-}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/2-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/2-in.cc
new file mode 100644
index 00000000000..8c563ad41e8
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/2-in.cc
@@ -0,0 +1,82 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type snextc()
+  // calls sbumpc and if sbumpc != eof, return sgetc
+  
+  // in
+  {
+    constraint_filebuf fb_01; 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( fb_01.unbuffered() );
+    c1 = fb_01.snextc();
+    VERIFY( c1 == '/' ); // overflow
+    c1 = fb_01.snextc();
+    VERIFY( c1 == ' ' ); 
+    VERIFY( fb_01.unbuffered() );
+  }
+
+  // in
+  {  
+    constraint_filebuf fb_01; 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( fb_01.unbuffered() );
+    int_type c4 = fb_01.sbumpc();
+    VERIFY( c4 == '/' );
+    c4 = fb_01.sbumpc();
+    VERIFY( c4 == '/' );
+    c4 = fb_01.sgetc();
+    VERIFY( c4 == ' ' );
+    c1 = fb_01.snextc();
+    VERIFY( c1 == '9' );
+    c4 = fb_01.sgetc();
+    VERIFY( c4 == '9' );
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/2-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/2-io.cc
new file mode 100644
index 00000000000..a044c6d4f41
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/2-io.cc
@@ -0,0 +1,81 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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[] = "sgetc.txt"; // file with data in it
+const char name_03[] = "tmp_snextc_2io.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type snextc()
+  // calls sbumpc and if sbumpc != eof, return sgetc
+
+  // in | out 1
+  {
+    constraint_filebuf fb_03; 
+    fb_03.pubsetbuf(0, 0);
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
+    VERIFY( fb_03.unbuffered() );
+    c3 = fb_03.snextc();
+    VERIFY( c3 == traits_type::eof() );
+    VERIFY( fb_03.unbuffered() );
+  }
+
+  // in | out 2
+  {  
+    constraint_filebuf fb_01; 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios_base::in | ios_base::out);
+    VERIFY( fb_01.unbuffered() );
+    int_type c4 = fb_01.sbumpc();
+    VERIFY( c4 == '/' );
+    c4 = fb_01.sbumpc();
+    VERIFY( c4 == '/' );
+    c4 = fb_01.sgetc();
+    VERIFY( c4 == ' ' );
+    c1 = fb_01.snextc();
+    VERIFY( c1 == '9' );
+    c4 = fb_01.sgetc();
+    VERIFY( c4 == '9' );
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/2-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/2-out.cc
new file mode 100644
index 00000000000..8af126337f6
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/snextc/char/2-out.cc
@@ -0,0 +1,63 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_snextc_2out.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  int_type 			c1, c2, c3;
+
+  // int_type snextc()
+  // calls sbumpc and if sbumpc != eof, return sgetc
+
+  // out
+  {    
+    constraint_filebuf fb_02;
+    fb_02.pubsetbuf(0, 0);
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.unbuffered() );
+    c2 = fb_02.snextc();
+    VERIFY( c2 == traits_type::eof() );
+    c2 = fb_02.snextc();
+    VERIFY( c2 == traits_type::eof() );
+    VERIFY( fb_02.unbuffered() );
+ }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1-in.cc
new file mode 100644
index 00000000000..25d9ee0ce8d
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1-in.cc
@@ -0,0 +1,65 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+  int 					i = 0, j = 0, k = 0;
+  int_type 			c1, c2, 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.open(name_01, ios_base::in);
+    VERIFY( !fb_01.write_position() );
+    c3 = fb_01.sputc('a'); 
+    VERIFY( c3 == traits_type::eof() );
+    VERIFY( !fb_01.write_position() );
+   }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1-io.cc
new file mode 100644
index 00000000000..c1717612b6c
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1-io.cc
@@ -0,0 +1,72 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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
+const char name_03[] = "tmp_sputc_1io.tst";
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+  int 					i = 0, j = 0, k = 0;
+  int_type 			c1, c2, 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 | out 1
+  {
+    constraint_filebuf fb_03; 
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+    c1 = fb_03.sputc('b'); 
+    VERIFY( c1 == 'b' );
+    c2 = fb_03.sputc('d'); 
+    VERIFY( c2 == 'd' );
+    for (int i = 50; i <= 90; ++i) 
+      c2 = fb_03.sputc(char(i));
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1-out.cc
new file mode 100644
index 00000000000..987b4e26217
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1-out.cc
@@ -0,0 +1,71 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sputc_1out.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+  int 					i = 0, j = 0, k = 0;
+  int_type 			c1, c2, 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
+
+  // out
+  {
+    constraint_filebuf fb_02; 
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+    c1 = fb_02.sputc('a');
+    VERIFY( c1 == 'a' ); 
+    c2 = fb_02.sputc('c'); 
+    VERIFY( c2 == 'c' );
+    for (int i = 50; i <= 90; ++i) 
+      c2 = fb_02.sputc(char(i));
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1.cc
deleted file mode 100644
index b02c70fb49a..00000000000
--- a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/1.cc
+++ /dev/null
@@ -1,124 +0,0 @@
-// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
-
-// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
-
-// 27.8.1.4 Overridden virtual functions
-
-#include <fstream>
-#include <testsuite_hooks.h>
-
-// @require@ %-*.tst %-*.txt
-// @diff@ %-*.tst %*.txt
-
-// NB: This test assumes that _M_buf_size == 40, and not the usual
-// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
-// simulated a bit more readily.
-// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
-const int buffer_size = 8192;
-//const int buffer_size = 40;
-
-const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
-const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
-const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
-
-class derived_filebuf: public std::filebuf
-{
- public:
-  void
-  set_size(int_type __size) { _M_buf_size = __size; }
-};
-
-derived_filebuf fb_01; // in 
-derived_filebuf fb_02; // out
-derived_filebuf fb_03; // in | out
-
-// Initialize filebufs to be the same size regardless of platform.
-void test03()
-{
-  fb_01.set_size(buffer_size);
-  fb_02.set_size(buffer_size);
-  fb_03.set_size(buffer_size);
-}
-
-// Test overloaded virtual functions.
-void test05() 
-{
-  typedef std::filebuf::int_type 	int_type;
-  typedef std::filebuf::traits_type 	traits_type;
-  typedef std::filebuf::pos_type 	pos_type;
-  typedef std::filebuf::off_type 	off_type;
-  typedef size_t 			size_type;
-
-  bool 					test = true;
-  std::filebuf 				f_tmp;
-  std::streamsize 			strmsz_1, strmsz_2;
-  std::streamoff  			strmof_1, strmof_2;
-  int 					i = 0, j = 0, k = 0;
-
-  fb_01.open(name_01, std::ios_base::in);
-  fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
-  fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc);
-
-  int_type c1 = fb_01.sbumpc();
-  int_type c2 = fb_02.sbumpc();
-  int_type c3 = fb_01.sbumpc();
-  int_type c4 = fb_02.sbumpc();
-  int_type c5 = fb_03.sbumpc();
-  int_type c6 = fb_01.sgetc();
-  int_type c7 = fb_02.sgetc();
-  int_type c8 = fb_01.sgetc();
-  int_type c9 = fb_02.sgetc();
-
-  // PUT
-  // 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
-  // strmsz_1 = fb_03.in_avail();  // XXX valid for in|out??
-  c1 = fb_02.sputc('a'); 
-  c2 = fb_03.sputc('b'); 
-  VERIFY( c1 != c2 );
-  c1 = fb_02.sputc('c'); 
-  c2 = fb_03.sputc('d'); 
-  VERIFY( c1 != c2 );
-  // strmsz_2 = fb_03.in_avail();
-  // VERIFY( strmsz_1 != strmsz_2 );
-  for (int i = 50; i <= 90; ++i) 
-    c2 = fb_02.sputc(char(i));
-  // 27filebuf-2.txt == ac23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWX
-  // fb_02._M_out_cur = '2'
-  strmsz_1 = fb_03.in_avail();
-  for (int i = 50; i <= 90; ++i) 
-    c2 = fb_03.sputc(char(i));
-  strmsz_2 = fb_03.in_avail();
-  // VERIFY( strmsz_1 != strmsz_2 );
-  // VERIFY( strmsz_1 > 0 );
-  // VERIFY( strmsz_2 > 0 );
-  // 27filebuf-2.txt == bd23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWX
-  // fb_02._M_out_cur = '2'
-  c3 = fb_01.sputc('a'); // should be EOF because this is read-only
-  VERIFY( c3 == traits_type::eof() );
-}
-
-main() 
-{
-  test03();
-  test05();
-  return 0;
-}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2-in.cc
new file mode 100644
index 00000000000..85ab4efbeff
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2-in.cc
@@ -0,0 +1,66 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+  int 					i = 0, j = 0, k = 0;
+  int_type 			c1, c2, 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() );
+   }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2-io.cc
new file mode 100644
index 00000000000..373a6a8cba5
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2-io.cc
@@ -0,0 +1,71 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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
+const char name_03[] = "tmp_sputc_2io.tst";
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+  int 					i = 0, j = 0, k = 0;
+  int_type 			c1, c2, 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 | out 1
+  {
+    constraint_filebuf fb_03; 
+    fb_03.pubsetbuf(0, 0);
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
+    VERIFY( fb_03.unbuffered() );
+    c1 = fb_03.sputc('b'); 
+    VERIFY( c1 == 'b' );
+    c2 = fb_03.sputc('d'); 
+    VERIFY( c2 == 'd' );
+    for (int i = 50; i <= 90; ++i) 
+      c2 = fb_03.sputc(char(i));
+    VERIFY( fb_03.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2-out.cc
new file mode 100644
index 00000000000..96e12954a97
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2-out.cc
@@ -0,0 +1,72 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sputc_2out.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+  int 					i = 0, j = 0, k = 0;
+  int_type 			c1, c2, 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
+
+  // out
+  {
+    constraint_filebuf fb_02; 
+    fb_02.pubsetbuf(0, 0);
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+    c1 = fb_02.sputc('a');
+    VERIFY( c1 == 'a' ); 
+    c2 = fb_02.sputc('c'); 
+    VERIFY( c2 == 'c' );
+    for (int i = 50; i <= 90; ++i) 
+      c2 = fb_02.sputc(char(i));
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2.cc
deleted file mode 100644
index f6a4ae8b0db..00000000000
--- a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputc/char/2.cc
+++ /dev/null
@@ -1,129 +0,0 @@
-// 2003-05-21 Benjamin Kosnik  <bkoz@redhat.com>
-
-// Copyright (C) 2003 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 2, 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 COPYING.  If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
-
-// 27.8.1.4 Overridden virtual functions
-
-#include <fstream>
-#include <testsuite_hooks.h>
-
-// @require@ %-*.tst %-*.txt
-// @diff@ %-*.tst %*.txt
-
-// NB: This test assumes that _M_buf_size == 40, and not the usual
-// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
-// simulated a bit more readily.
-// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
-const int buffer_size = 8192;
-//const int buffer_size = 40;
-
-const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
-const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
-const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
-
-class derived_filebuf: public std::filebuf
-{
- public:
-  void
-  set_size(int_type __size) { _M_buf_size = __size; }
-};
-
-derived_filebuf fb_01; // in 
-derived_filebuf fb_02; // out
-derived_filebuf fb_03; // in | out
-
-// Initialize filebufs to be the same size regardless of platform.
-void test03()
-{
-  fb_01.set_size(buffer_size);
-  fb_02.set_size(buffer_size);
-  fb_03.set_size(buffer_size);
-}
-
-// Test overloaded virtual functions.
-void test05() 
-{
-  typedef std::filebuf::int_type 	int_type;
-  typedef std::filebuf::traits_type 	traits_type;
-  typedef std::filebuf::pos_type 	pos_type;
-  typedef std::filebuf::off_type 	off_type;
-  typedef size_t 			size_type;
-
-  bool 					test = true;
-  std::filebuf 				f_tmp;
-  std::streamsize 			strmsz_1, strmsz_2;
-  std::streamoff  			strmof_1, strmof_2;
-  int 					i = 0, j = 0, k = 0;
-
-  // Unbuffered
-  fb_01.pubsetbuf(0, 0);
-  fb_02.pubsetbuf(0, 0);
-  fb_03.pubsetbuf(0, 0);
-
-  fb_01.open(name_01, std::ios_base::in);
-  fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
-  fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc);
-
-  int_type c1 = fb_01.sbumpc();
-  int_type c2 = fb_02.sbumpc();
-  int_type c3 = fb_01.sbumpc();
-  int_type c4 = fb_02.sbumpc();
-  int_type c5 = fb_03.sbumpc();
-  int_type c6 = fb_01.sgetc();
-  int_type c7 = fb_02.sgetc();
-  int_type c8 = fb_01.sgetc();
-  int_type c9 = fb_02.sgetc();
-
-  // PUT
-  // 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
-  // strmsz_1 = fb_03.in_avail();  // XXX valid for in|out??
-  c1 = fb_02.sputc('a'); 
-  c2 = fb_03.sputc('b'); 
-  VERIFY( c1 != c2 );
-  c1 = fb_02.sputc('c'); 
-  c2 = fb_03.sputc('d'); 
-  VERIFY( c1 != c2 );
-  // strmsz_2 = fb_03.in_avail();
-  // VERIFY( strmsz_1 != strmsz_2 );
-  for (int i = 50; i <= 90; ++i) 
-    c2 = fb_02.sputc(char(i));
-  // 27filebuf-2.txt == ac23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWX
-  // fb_02._M_out_cur = '2'
-  strmsz_1 = fb_03.in_avail();
-  for (int i = 50; i <= 90; ++i) 
-    c2 = fb_03.sputc(char(i));
-  strmsz_2 = fb_03.in_avail();
-  // VERIFY( strmsz_1 != strmsz_2 );
-  // VERIFY( strmsz_1 > 0 );
-  // VERIFY( strmsz_2 > 0 );
-  // 27filebuf-2.txt == bd23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWX
-  // fb_02._M_out_cur = '2'
-  c3 = fb_01.sputc('a'); // should be EOF because this is read-only
-  VERIFY( c3 == traits_type::eof() );
-}
-
-main() 
-{
-  test03();
-  test05();
-  return 0;
-}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-in.cc
new file mode 100644
index 00000000000..235fce07e22
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-in.cc
@@ -0,0 +1,63 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+  typedef size_t 			size_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+
+  // streamsize sputn(const char_typs* s, streamsize n)
+  // write up to n chars to out_cur from s, returning number assigned
+  // NB *sputn will happily put '\0' into your stream if you give it a chance*
+
+  // in 
+  {
+    constraint_filebuf fb_01; 
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( !fb_01.write_position() );
+    strmsz_1 = fb_01.sputn("racadabra", 10);
+    VERIFY( strmsz_1 == 0 );  
+    VERIFY( !fb_01.write_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-io.cc
new file mode 100644
index 00000000000..37509601427
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-io.cc
@@ -0,0 +1,69 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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
+const char name_03[] = "tmp_sputn_1io.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+  typedef size_t 			size_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+
+  // streamsize sputn(const char_typs* s, streamsize n)
+  // write up to n chars to out_cur from s, returning number assigned
+  // NB *sputn will happily put '\0' into your stream if you give it a chance*
+
+  // in | out
+  {
+    constraint_filebuf fb_03; 
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+    strmsz_1 = fb_03.sputn("racadabras", 10);//"abracadabras or what?"
+    VERIFY( strmsz_1 == 10 );
+    strmsz_2 = fb_03.sputn(", i wanna reach out and", 10);
+    VERIFY( strmsz_2 == 10 );
+    VERIFY( strmsz_1 == strmsz_2 ); 
+    VERIFY( fb_03.write_position() );
+    VERIFY( !fb_03.read_position() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-out.cc
new file mode 100644
index 00000000000..647f310d87f
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-out.cc
@@ -0,0 +1,65 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sputn_1out.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+  typedef size_t 			size_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+
+  // streamsize sputn(const char_typs* s, streamsize n)
+  // write up to n chars to out_cur from s, returning number assigned
+  // NB *sputn will happily put '\0' into your stream if you give it a chance*
+
+  // out
+  {
+    constraint_filebuf fb_02; 
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+    strmsz_1 = fb_02.sputn("racadabras", 10);
+    VERIFY( strmsz_1 == 10 );  
+    VERIFY( fb_02.write_position() );
+    VERIFY( !fb_02.read_position() );
+   }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1.cc
deleted file mode 100644
index 151ae42d66f..00000000000
--- a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1.cc
+++ /dev/null
@@ -1,112 +0,0 @@
-// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
-
-// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
-
-// 27.8.1.4 Overridden virtual functions
-
-#include <fstream>
-#include <testsuite_hooks.h>
-
-// @require@ %-*.tst %-*.txt
-// @diff@ %-*.tst %*.txt
-
-// NB: This test assumes that _M_buf_size == 40, and not the usual
-// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
-// simulated a bit more readily.
-// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
-const int buffer_size = 8192;
-//const int buffer_size = 40;
-
-const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
-const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
-const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
-
-class derived_filebuf: public std::filebuf
-{
- public:
-  void
-  set_size(int_type __size) { _M_buf_size = __size; }
-};
-
-derived_filebuf fb_01; // in 
-derived_filebuf fb_02; // out
-derived_filebuf fb_03; // in | out
-
-// Initialize filebufs to be the same size regardless of platform.
-void test03()
-{
-  fb_01.set_size(buffer_size);
-  fb_02.set_size(buffer_size);
-  fb_03.set_size(buffer_size);
-}
-
-// Test overloaded virtual functions.
-void test05() 
-{
-  typedef std::filebuf::int_type 	int_type;
-  typedef std::filebuf::traits_type 	traits_type;
-  typedef std::filebuf::pos_type 	pos_type;
-  typedef std::filebuf::off_type 	off_type;
-  typedef size_t 			size_type;
-
-  bool 					test = true;
-  std::filebuf 				f_tmp;
-  std::streamsize 			strmsz_1, strmsz_2;
-  std::streamoff  			strmof_1, strmof_2;
-  int 					i = 0, j = 0, k = 0;
-
-  fb_01.open(name_01, std::ios_base::in);
-  fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
-  fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc);
-
-  int_type c1 = fb_01.sbumpc();
-  int_type c2 = fb_02.sbumpc();
-  int_type c3 = fb_01.sbumpc();
-  int_type c4 = fb_02.sbumpc();
-  int_type c5 = fb_03.sbumpc();
-  int_type c6 = fb_01.sgetc();
-  int_type c7 = fb_02.sgetc();
-  int_type c8 = fb_01.sgetc();
-  int_type c9 = fb_02.sgetc();
-
-  // PUT
-  // streamsize sputn(const char_typs* s, streamsize n)
-  // write up to n chars to out_cur from s, returning number assigned
-  // NB *sputn will happily put '\0' into your stream if you give it a chance*
-  strmsz_1 = fb_03.sputn("racadabras", 10);//"abracadabras or what?"
-  VERIFY( strmsz_1 == 10 );
-  strmsz_2 = fb_03.sputn(", i wanna reach out and", 10);
-  VERIFY( strmsz_2 == 10 );
-  VERIFY( strmsz_1 == strmsz_2 ); 
-  // fb_03._M_out_beg = "YZracadabras, i wanna FGHIJKLMNOPQRSTUVW"
-  // fb_03._M_out_cur = "FGHIJKLMNOPQRSTUVW"
-  strmsz_1 = fb_02.sputn("racadabras", 10);
-  VERIFY( strmsz_1 == 10 );  
-  // fb_02._M_out_beg = "YZracadabras<=>?@ABCDEFGHIJKLMNOPQRSTUVW"
-  // fb_02._M_out_cur = "<=>?@ABCDEFGHIJKLMNOPQRSTUVW"
-  strmsz_1 = fb_01.sputn("racadabra", 10);
-  VERIFY( strmsz_1 == 0 );  
-}
-
-main() 
-{
-  test03();
-  test05();
-  return 0;
-}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/2-in.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/2-in.cc
new file mode 100644
index 00000000000..8972b5efcb8
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/2-in.cc
@@ -0,0 +1,64 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+  typedef size_t 			size_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+
+  // streamsize sputn(const char_typs* s, streamsize n)
+  // write up to n chars to out_cur from s, returning number assigned
+  // NB *sputn will happily put '\0' into your stream if you give it a chance*
+
+  // in 
+  {
+    constraint_filebuf fb_01; 
+    fb_01.pubsetbuf(0, 0);
+    fb_01.open(name_01, ios_base::in);
+    VERIFY( fb_01.unbuffered() );
+    strmsz_1 = fb_01.sputn("racadabra", 10);
+    VERIFY( strmsz_1 == 0 );  
+    VERIFY( fb_01.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/2-io.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/2-io.cc
new file mode 100644
index 00000000000..c6109c2f100
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/2-io.cc
@@ -0,0 +1,68 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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
+const char name_03[] = "tmp_sputn_2io.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+  typedef size_t 			size_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+
+  // streamsize sputn(const char_typs* s, streamsize n)
+  // write up to n chars to out_cur from s, returning number assigned
+  // NB *sputn will happily put '\0' into your stream if you give it a chance*
+
+  // in | out
+  {
+    constraint_filebuf fb_03; 
+    fb_03.pubsetbuf(0, 0);
+    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
+    VERIFY( fb_03.unbuffered() );
+    strmsz_1 = fb_03.sputn("racadabras", 10);//"abracadabras or what?"
+    VERIFY( strmsz_1 == 10 );
+    strmsz_2 = fb_03.sputn(", i wanna reach out and", 10);
+    VERIFY( strmsz_2 == 10 );
+    VERIFY( strmsz_1 == strmsz_2 ); 
+    VERIFY( fb_03.unbuffered() );
+  }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/2-out.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/2-out.cc
new file mode 100644
index 00000000000..81cd506aba1
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/2-out.cc
@@ -0,0 +1,66 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 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_02[] = "tmp_sputn_2out.tst"; // empty file, need to create
+
+void test05() 
+{
+  using namespace std;
+  using namespace __gnu_cxx_test;
+
+  typedef filebuf::int_type 	int_type;
+  typedef filebuf::traits_type 	traits_type;
+  typedef size_t 			size_type;
+
+  bool 					test = true;
+  streamsize 			strmsz_1, strmsz_2;
+
+  // streamsize sputn(const char_typs* s, streamsize n)
+  // write up to n chars to out_cur from s, returning number assigned
+  // NB *sputn will happily put '\0' into your stream if you give it a chance*
+
+  // out
+  {
+    constraint_filebuf fb_02; 
+    fb_02.pubsetbuf(0, 0);
+    fb_02.open(name_02, ios_base::out | ios_base::trunc);
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+    strmsz_1 = fb_02.sputn("racadabras", 10);
+    VERIFY( strmsz_1 == 10 );  
+    VERIFY( fb_02.unbuffered() );
+    VERIFY( !fb_02.read_position() );
+   }
+}
+
+main() 
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/data/sgetc.txt b/libstdc++-v3/testsuite/data/sgetc.txt
new file mode 100644
index 00000000000..87e81f67772
--- /dev/null
+++ b/libstdc++-v3/testsuite/data/sgetc.txt
@@ -0,0 +1,3 @@
+// 990117 bkoz
+// test functionality of basic_filebuf for char_type == char
+// this is a data file for 27filebuf.cc
diff --git a/libstdc++-v3/testsuite/data/sgetn.txt b/libstdc++-v3/testsuite/data/sgetn.txt
new file mode 100644
index 00000000000..cb3c57f7dfd
--- /dev/null
+++ b/libstdc++-v3/testsuite/data/sgetn.txt
@@ -0,0 +1,158 @@
+// 990117 bkoz
+// test functionality of basic_filebuf for char_type == char
+// this is a data file for 27filebuf.cc
+
+// Copyright (C) 1997-1999 Cygnus Solutions
+//
+// 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+/mnt/cdrom/sarah_vaughan/sarah_vaughan.allofme
+/mnt/cdrom/sarah_vaughan/sarah_vaughan.speaklow
+
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_01_the_way_i_feel
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_02_seduction_kidnap
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_03_just_a_ny_poem
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_04_butterflies_i_remem
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_05_luxury_poem
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_06_my_house
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_07_the_women_gather
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_08_the_life_i_led
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_09_when_i_die
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_10_revolutionary_dreams
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_11_winter_poem
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_12_a_certain_peace_i_nap
+/mnt/cdrom/nikkigiovanni_thewayifeel/ng_13_poem_for_a_lady_whose
+
+/mnt/cdrom/marley-songs_of_freedom/disk_1/
+/mnt/cdrom/marley-songs_of_freedom/disk_2/
+/mnt/cdrom/marley-songs_of_freedom/disk_4/
+
+/mnt/cdrom/marley-songs_of_freedom/disk_1/back out
+/mnt/cdrom/marley-songs_of_freedom/disk_1/bend down low
+/mnt/cdrom/marley-songs_of_freedom/disk_1/bus dem shut (pyaka)
+/mnt/cdrom/marley-songs_of_freedom/disk_1/caution
+/mnt/cdrom/marley-songs_of_freedom/disk_1/do it twice
+/mnt/cdrom/marley-songs_of_freedom/disk_1/don't rock the boat
+/mnt/cdrom/marley-songs_of_freedom/disk_1/duppy conqueror
+/mnt/cdrom/marley-songs_of_freedom/disk_1/hammer
+/mnt/cdrom/marley-songs_of_freedom/disk_1/hypocrites
+/mnt/cdrom/marley-songs_of_freedom/disk_1/i'm still waiting
+/mnt/cdrom/marley-songs_of_freedom/disk_1/judge not
+/mnt/cdrom/marley-songs_of_freedom/disk_1/mellow mood
+/mnt/cdrom/marley-songs_of_freedom/disk_1/mr brown
+/mnt/cdrom/marley-songs_of_freedom/disk_1/nice time
+/mnt/cdrom/marley-songs_of_freedom/disk_1/one cup of coffee
+/mnt/cdrom/marley-songs_of_freedom/disk_1/one love_people get ready
+/mnt/cdrom/marley-songs_of_freedom/disk_1/put it on
+/mnt/cdrom/marley-songs_of_freedom/disk_1/simmer down
+/mnt/cdrom/marley-songs_of_freedom/disk_1/small axe
+/mnt/cdrom/marley-songs_of_freedom/disk_1/soul rebel
+/mnt/cdrom/marley-songs_of_freedom/disk_1/soul shake down party
+/mnt/cdrom/marley-songs_of_freedom/disk_1/stir it up (original)
+/mnt/cdrom/marley-songs_of_freedom/disk_1/sun is shining
+/mnt/cdrom/marley-songs_of_freedom/disk_1/thank you lord (original)
+/mnt/cdrom/marley-songs_of_freedom/disk_2/acoustic medley
+/mnt/cdrom/marley-songs_of_freedom/disk_2/burnin' and lootin'
+/mnt/cdrom/marley-songs_of_freedom/disk_2/concrete jungle
+/mnt/cdrom/marley-songs_of_freedom/disk_2/craven choke puppy
+/mnt/cdrom/marley-songs_of_freedom/disk_2/get up stand up
+/mnt/cdrom/marley-songs_of_freedom/disk_2/guava jelly
+/mnt/cdrom/marley-songs_of_freedom/disk_2/high tide or low tide
+/mnt/cdrom/marley-songs_of_freedom/disk_2/i shot the sheriff
+/mnt/cdrom/marley-songs_of_freedom/disk_2/i'm hurting inside
+/mnt/cdrom/marley-songs_of_freedom/disk_2/iron lion zion
+/mnt/cdrom/marley-songs_of_freedom/disk_2/lick samba
+/mnt/cdrom/marley-songs_of_freedom/disk_2/lively up yourself
+/mnt/cdrom/marley-songs_of_freedom/disk_2/natty dread
+/mnt/cdrom/marley-songs_of_freedom/disk_2/no more trouble
+/mnt/cdrom/marley-songs_of_freedom/disk_2/rastaman chant
+/mnt/cdrom/marley-songs_of_freedom/disk_2/screw face
+/mnt/cdrom/marley-songs_of_freedom/disk_2/slave driver
+/mnt/cdrom/marley-songs_of_freedom/disk_2/trenchtown rock
+/mnt/cdrom/marley-songs_of_freedom/disk_4/africa unite
+/mnt/cdrom/marley-songs_of_freedom/disk_4/babylon system
+/mnt/cdrom/marley-songs_of_freedom/disk_4/bad card
+/mnt/cdrom/marley-songs_of_freedom/disk_4/coming in from the cold (12
+/mnt/cdrom/marley-songs_of_freedom/disk_4/could you be loved (12  mix
+/mnt/cdrom/marley-songs_of_freedom/disk_4/forever loving jah
+/mnt/cdrom/marley-songs_of_freedom/disk_4/give thanks and praise
+/mnt/cdrom/marley-songs_of_freedom/disk_4/one drop
+/mnt/cdrom/marley-songs_of_freedom/disk_4/one dub
+/mnt/cdrom/marley-songs_of_freedom/disk_4/rastaman live up
+/mnt/cdrom/marley-songs_of_freedom/disk_4/real situation
+/mnt/cdrom/marley-songs_of_freedom/disk_4/redemption song (live in pi
+/mnt/cdrom/marley-songs_of_freedom/disk_4/ride natty ride (12  mix)
+/mnt/cdrom/marley-songs_of_freedom/disk_4/so much trouble in the worl
+/mnt/cdrom/marley-songs_of_freedom/disk_4/survival
+/mnt/cdrom/marley-songs_of_freedom/disk_4/why should i (previously un
+/mnt/cdrom/marley-songs_of_freedom/disk_4/zimbabwe
+
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_01_pandemonium
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_02_sync_disjecta
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_03_object_unknown
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_04_it's_nice_not
+/mnt/cdrom/dj_spooky_rid-2dim_warefare/djspooky_05_dialectical_tra
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_06_post-human_soph
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_07_quilombo_ex
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_08_rekonstruction
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_09_scientifik
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_10_a_conversation
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_11_peace_in_zaire
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_13_degree_zero
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_14_roman_planeta
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_15_bass_digitalis
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_16_polyphony_of
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_17_riddim_warfare
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_18_the_nerd
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_20_theme_of_the
+/mnt/cdrom/dj_spooky_riddim_warefare/djspooky_21_twilight_fugue
+
+/mnt/cdrom/stuff_smith_mosaic/disk3/01_desert_sands
+/mnt/cdrom/stuff_smith_mosaic/disk3/02_soft_winds
+/mnt/cdrom/stuff_smith_mosaic/disk3/03_time_and_again
+/mnt/cdrom/stuff_smith_mosaic/disk3/04_it_don't_mean_a_thing
+/mnt/cdrom/stuff_smith_mosaic/disk3/05_in_a_mellotone
+/mnt/cdrom/stuff_smith_mosaic/disk3/06_i_know_that_you_know
+/mnt/cdrom/stuff_smith_mosaic/disk3/07_heat_wave
+/mnt/cdrom/stuff_smith_mosaic/disk3/08_things_ain't_what_they_used_to_be
+/mnt/cdrom/stuff_smith_mosaic/disk3/09_body_and_soul
+
+So I take a break, wander down to the park to stand, then lean into
+the concrete railing demarking the beginnings of space, oceanic
+space. I watch the waves break, and form, and ease back out to sea and
+wrap my arms around myself and hug tightly because it's early in the
+morning and windy, and the sun is late getting out of bed today, which
+is good because if there was brilliant light illuminating all the
+beauty around me I would be shocked, stunned, forced to retreat back
+into my cabana in a daze, blinded by hummingbirds and callilillies and
+un-named red, yellow, and blue flowers. Green envelopes me, waves
+sooth me. I can see the wind flip the top of the waves seaward, right
+before they break. The sea seems so calm from my perch above the fray
+that I wonder if maybe there is just some part of the deepest, most
+abstract ocean where there is a large creature who happily chews
+plankton and wags its tail in gentle, adulating waves that spread and
+move and gracefully glide thousands of miles, to crash upon a beach,
+one after the other, politely waiting for a turn to dance with the
+seashore.
+
+I know: it is what the Mexican schoolchildren call "la vibora de la
+mer," the serpent of the sea.
+
+
+
+
+
diff --git a/libstdc++-v3/testsuite/testsuite_hooks.h b/libstdc++-v3/testsuite/testsuite_hooks.h
index 0c3aae6cec9..719135caa58 100644
--- a/libstdc++-v3/testsuite/testsuite_hooks.h
+++ b/libstdc++-v3/testsuite/testsuite_hooks.h
@@ -110,6 +110,7 @@ namespace __gnu_cxx_test
   std::locale
   try_named_locale(const char* name);
 
+
   // Test data types.
   struct pod_char
   {
@@ -137,6 +138,7 @@ namespace __gnu_cxx_test
     unsigned long l2;
   };
 
+
   // Counting.
   struct counter
   {
diff --git a/libstdc++-v3/testsuite/testsuite_io.h b/libstdc++-v3/testsuite/testsuite_io.h
new file mode 100644
index 00000000000..33de2a05b14
--- /dev/null
+++ b/libstdc++-v3/testsuite/testsuite_io.h
@@ -0,0 +1,79 @@
+// -*- C++ -*-
+// Testing filebuf for the C++ library testsuite.
+//
+// Copyright (C) 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+//
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#ifndef _GLIBCPP_TESTSUITE_IO_H
+#define _GLIBCPP_TESTSUITE_IO_H
+
+#include <fstream>
+
+namespace __gnu_cxx_test
+{  
+  // Used to verify the constraints/requirements on get and put areas
+  // as defined in 
+  // 27.5.1 - Stream buffer requirements: get and put areas
+  // 27.8.1.1 - Template class basic_filebuf p 3
+  //   If the file is not open (ios_base::in) -> input seq. cannot be read
+  //   If the file is not open (ios_base::out) -> output seq. cannot be written
+  //   Joint file position
+  // 27.8.1.4 - Overridden virtual functions p9
+  //   If unbuffered, pbase == pptr == NULL
+  class constraint_filebuf: public std::filebuf
+  {
+  public:
+    bool
+    write_position() 
+    { 
+      bool two = this->pptr() != NULL; 
+      bool one = this->pptr() < this->epptr();
+      return one && two;
+    }
+
+    bool
+    read_position()
+    { 
+      bool one = this->gptr() != NULL; 
+      bool two = this->gptr() < this->egptr();
+
+      return one && two;
+    }
+
+    bool
+    unbuffered() 
+    { 
+      bool one = this->pbase() == NULL; 
+      bool two = this->pptr() == NULL; 
+      return one && two;
+    }
+    
+  };
+}; // namespace __gnu_cxx_test
+
+#endif // _GLIBCPP_TESTSUITE_IO_H
+