obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

15 files changed, 1550 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/1.cc
new file mode 100644
index 000000000..72c3ecb0a
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/1.cc
@@ -0,0 +1,111 @@
+// { dg-require-namedlocale "se_NO.UTF-8" }
+
+// 2003-09-04  Petur Runolfsson  <peturr02@ru.is>
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <locale>
+#include <fstream>
+#include <cstdio>
+#include <testsuite_hooks.h>
+
+// Test handing of UTF-8 in basic_filebuf::underflow
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+  const char name[] = "tmp_underflow-1.tst";
+
+  const char cstr[] =
+    "\x1\x2\x3\x4\x5\x6\x7\x8\x9\xa\xb\xc\xd\xe\xf\x10\x11\x12\x13"
+    "\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20!\"#$%&"
+    "'()*+,-./0123456789:;<=>?@}~\x7f\xc2\x80\xc2\x81\xc2\x82\xc2"
+    "\x83\xc2\x84\xc2\x85\xc2\x86\xc2\x87\xc2\x88\xc2\x89\xc2\x8a"
+    "\xc2\x8b\xc2\x8c\xc2\x8d\xc2\x8e\xc2\x8f\xc2\x90\xc2\x91\xc2"
+    "\x92\xc2\x93\xc2\x94\xc2\x95\xc2\x96\xc2\x97\xc2\x98\xc2\x99"
+    "\xc2\x9a\xc2\x9b\xc2\x9c\xc3\xba\xc3\xbb\xc3\xbc\xc3\xbd\xc3"
+    "\xbe\xc3\xbf\xc4\x80\xc4\x81\xc4\x82\xc4\x83\xc4\x84\xc4\x85"
+    "\xc4\x86\xc4\x87\xc4\x88\xc4\x89\xc4\x8a\xc4\x8b\xc4\x8c\xc4"
+    "\x8d\xc4\x8e\xc4\x8f\xc4\x90\xc4\x91\xc4\x92\xc4\x93\xc4\x94"
+    "\xc4\x95\xc4\x96\xc4\x97\xc4\x98\xc4\x99\xdf\xb8\xdf\xb9\xdf"
+    "\xba\xdf\xbb\xdf\xbc\xdf\xbd\xdf\xbe\xdf\xbf\xe0\xa0\x80\xe0"
+    "\xa0\x81\xe0\xa0\x82\xe0\xa0\x83\xe0\xa0\x84\xe0\xa0\x85\xe0"
+    "\xa0\x86\xe0\xa0\x87\xe0\xa0\x88\xe0\xa0\x89\xe0\xa0\x8a\xe0"
+    "\xa0\x8b\xe0\xa0\x8c\xe0\xa0\x8d\xe0\xa0\x8e\xe0\xa0\x8f\xe0"
+    "\xa0\x90\xe0\xa0\x91\xe0\xa0\x92\xe0\xa0\x93\xe0\xa0\x94\xe0"
+    "\xa0\x95\xe0\xa0\x96\xe0\xa0\x97\x1\x2\x4\x8\x10\x20@\xc2\x80"
+    "\xc4\x80\xc8\x80\xd0\x80\xe0\xa0\x80\xe1\x80\x80\xe2\x80\x80"
+    "\xe4\x80\x80\xe8\x80\x80\xf0\x90\x80\x80\xf0\xa0\x80\x80\xf1"
+    "\x80\x80\x80\xf2\x80\x80\x80\xf4\x80\x80\x80\xf8\x88\x80\x80"
+    "\x80\xf8\x90\x80\x80\x80\xf8\xa0\x80\x80\x80\xf9\x80\x80\x80"
+    "\x80\xfa\x80\x80\x80\x80\xfc\x84\x80\x80\x80\x80\xfc\x88\x80"
+    "\x80\x80\x80\xfc\x90\x80\x80\x80\x80\xfc\xa0\x80\x80\x80\x80"
+    "\xfd\x80\x80\x80\x80\x80";
+
+  const wchar_t wstr[] = {
+    0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc,
+    0xd, 0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, L'!',
+    L'"', L'#', L'$', L'%', L'&', L'\'', L'(', L')', L'*', L'+',
+    L',', L'-', L'.', L'/', L'0', L'1', L'2', L'3', L'4', L'5',
+    L'6', L'7', L'8', L'9', L':', L';', L'<', L'=', L'>', L'?',
+    L'@', L'}', L'~', 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
+    0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
+    0x9a, 0x9b, 0x9c, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0x100,
+    0x101, 0x102, 0x103, 0x104, 0x105, 0x106, 0x107, 0x108, 0x109,
+    0x10a, 0x10b, 0x10c, 0x10d, 0x10e, 0x10f, 0x110, 0x111, 0x112,
+    0x113, 0x114, 0x115, 0x116, 0x117, 0x118, 0x119, 0x7f8, 0x7f9,
+    0x7fa, 0x7fb, 0x7fc, 0x7fd, 0x7fe, 0x7ff, 0x800, 0x801, 0x802,
+    0x803, 0x804, 0x805, 0x806, 0x807, 0x808, 0x809, 0x80a, 0x80b,
+    0x80c, 0x80d, 0x80e, 0x80f, 0x810, 0x811, 0x812, 0x813, 0x814,
+    0x815, 0x816, 0x817, 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, L'@',
+    0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000, 0x8000,
+    0x10000, 0x20000, 0x40000, 0x80000, 0x100000, 0x200000, 0x400000,
+    0x800000, 0x1000000, 0x2000000, 0x4000000, 0x8000000, 0x10000000,
+    0x20000000, 0x40000000, 0x0
+  };
+
+  const size_t clen = sizeof(cstr) / sizeof(cstr[0]);
+  const size_t wlen = sizeof(wstr) / sizeof(wstr[0]);
+
+  locale loc = locale("se_NO.UTF-8");
+
+  FILE* file = fopen(name, "w");
+  fwrite(cstr, 1, clen, file);
+  fclose(file);
+
+  wchar_t wbuf[wlen + 1];
+  
+  wfilebuf fb;
+  fb.pubimbue(loc);
+  fb.open(name, ios_base::in);
+  streamsize n = fb.sgetn(wbuf, wlen + 1);
+  fb.close();
+
+  VERIFY( n == static_cast<streamsize>(wlen) );
+  VERIFY( !wmemcmp(wbuf, wstr, wlen) );
+}
+
+int main ()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-1.cc
new file mode 100644
index 000000000..55e226705
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-1.cc
@@ -0,0 +1,50 @@
+// { dg-require-namedlocale "en_US.UTF-8" }
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+const char name_01[] = "tmp_11389-1";
+
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  filebuf fbout;
+  fbout.open(name_01, ios_base::out);
+  fbout.sputc('a');
+  fbout.close();
+  
+  wfilebuf fbin;
+  locale loc(locale("en_US.UTF-8"));
+  fbin.pubimbue(loc);
+  fbin.open(name_01, ios_base::in);
+  VERIFY( fbin.sbumpc() == L'a' );
+  VERIFY( fbin.sgetc() == wfilebuf::traits_type::eof() );
+  fbin.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-2.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-2.cc
new file mode 100644
index 000000000..e4527ee69
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-2.cc
@@ -0,0 +1,52 @@
+// { dg-require-namedlocale "en_US.UTF-8" }
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+const char name_02[] = "tmp_11389-2";
+
+void test02()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  filebuf fbout;
+  fbout.open(name_02, ios_base::out);
+  fbout.sputc('a');
+  fbout.sputc('b');
+  fbout.close();
+  
+  wfilebuf fbin;
+  locale loc(locale("en_US.UTF-8"));
+  fbin.pubimbue(loc);
+  fbin.open(name_02, ios_base::in);
+  VERIFY( fbin.sbumpc() == L'a' );
+  VERIFY( fbin.sbumpc() == L'b' );
+  VERIFY( fbin.sgetc() == wfilebuf::traits_type::eof() );
+  fbin.close();
+}
+
+int main()
+{
+  test02();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-3.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-3.cc
new file mode 100644
index 000000000..45bb4bdf5
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-3.cc
@@ -0,0 +1,51 @@
+// { dg-require-namedlocale "en_US.UTF-8" }
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+const char name_03[] = "tmp_11389-3";
+
+void test03()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  filebuf fbout;
+  fbout.open(name_03, ios_base::out);
+  fbout.sputc('a');
+  fbout.close();
+  
+  wfilebuf fbin;
+  locale loc(locale("en_US.UTF-8"));
+  fbin.pubimbue(loc);
+  fbin.pubsetbuf(0, 0);
+  fbin.open(name_03, ios_base::in);
+  VERIFY( fbin.sbumpc() == L'a' );
+  VERIFY( fbin.sgetc() == wfilebuf::traits_type::eof() );
+  fbin.close();
+}
+
+int main()
+{
+  test03();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-4.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-4.cc
new file mode 100644
index 000000000..637f89806
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-4.cc
@@ -0,0 +1,53 @@
+// { dg-require-namedlocale "en_US.UTF-8" }
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+const char name_04[] = "tmp_11389-4";
+
+void test04()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  filebuf fbout;
+  fbout.open(name_04, ios_base::out);
+  fbout.sputc('a');
+  fbout.sputc('b');
+  fbout.close();
+  
+  wfilebuf fbin;
+  locale loc(locale("en_US.UTF-8"));
+  fbin.pubimbue(loc);
+  fbin.pubsetbuf(0, 0);
+  fbin.open(name_04, ios_base::in);
+  VERIFY( fbin.sbumpc() == L'a' );
+  VERIFY( fbin.sbumpc() == L'b' );
+  VERIFY( fbin.sgetc() == wfilebuf::traits_type::eof() );
+  fbin.close();
+}
+
+int main()
+{
+  test04();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11544-1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11544-1.cc
new file mode 100644
index 000000000..7a27acd6f
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11544-1.cc
@@ -0,0 +1,184 @@
+// Copyright (C) 2003, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <locale>
+#include <cstdio>
+#include <testsuite_hooks.h>
+
+template <typename InternT, typename StateT = mbstate_t>
+class checksumcvt : public std::codecvt<InternT, char, StateT>
+{
+  typedef std::codecvt<InternT, char, StateT> Base;
+  static const size_t width = sizeof(InternT) + 1;
+
+public:
+  typedef InternT intern_type;
+  typedef char extern_type;
+
+  explicit checksumcvt(size_t refs = 0)
+  : Base(refs)
+  { }
+
+protected:
+  virtual typename std::codecvt<InternT, char, StateT>::result
+  do_out(StateT&, const intern_type* from,
+	 const intern_type* from_end, const intern_type*& from_next,
+	 extern_type* to, extern_type* to_end,
+	 extern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(from_end - from),
+			  static_cast<size_t>(to_end - to) / width);
+
+    while (len--)
+      {
+	const char* p = reinterpret_cast<const char*>(from);
+	unsigned char checksum = 0;
+				
+	for (size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    *to++ = p[i];
+	    checksum ^= static_cast<unsigned char>(p[i]);
+	  }
+
+	*to++ = checksum;
+	++from;
+      }
+
+    from_next = from;
+    to_next = to;
+    return from_next == from_end ? std::codecvt<InternT, char, StateT>::ok
+           : std::codecvt<InternT, char, StateT>::partial;
+  }
+
+  virtual typename std::codecvt<InternT, char, StateT>::result
+  do_unshift(StateT&, extern_type* to,
+	     extern_type*, extern_type*& to_next) const
+  {
+    to_next = to;
+    return std::codecvt<InternT, char, StateT>::ok;
+  }
+
+  virtual typename std::codecvt<InternT, char, StateT>::result
+  do_in(StateT&, const extern_type* from,
+	const extern_type* from_end, const extern_type*& from_next,
+	intern_type* to, intern_type* to_end,
+	intern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(to_end - to),
+			  static_cast<size_t>(from_end - from) / width);
+			
+    while (len)
+      {
+	const char* f = from;
+	intern_type tmp;
+	char* p = reinterpret_cast<char*>(&tmp);
+	unsigned char checksum = 0;
+
+	for (size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    p[i] = *f;
+	    checksum ^= static_cast<unsigned char>(*f++);
+	  }
+
+	if (*f++ != checksum)
+	  break;
+
+	from = f;
+	*to++ = tmp;
+	len--;
+      }
+
+    from_next = from;
+    to_next = to;
+    return len ? std::codecvt<InternT, char, StateT>::error :
+      (from_next == from_end ? std::codecvt<InternT, char, StateT>::ok
+       : std::codecvt<InternT, char, StateT>::partial);
+  }
+
+  virtual int
+  do_encoding() const throw()
+  { return width; }
+
+  virtual int
+  do_length(StateT&, const extern_type* from,
+	    const extern_type* end, size_t max) const
+  {
+    size_t len = std::min(max, static_cast<size_t>(end - from) / width);
+
+    int ret = 0;
+    while (len--)
+      {
+	unsigned char checksum = 0;
+
+	for (size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    checksum ^= static_cast<unsigned char>(*from++);
+	  }
+
+	if (*from++ != checksum)
+	  break;
+
+	ret++;
+      }
+
+    return ret;
+  }
+
+  virtual int
+  do_max_length() const throw()
+  { return width; }
+
+  virtual bool
+  do_always_noconv() const throw()
+  { return false; }
+};
+
+// libstdc++/11544 (incomplete character in file)
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  locale loc(locale::classic(), new checksumcvt<wchar_t>);
+
+  const char* name = "tmp_11544-1";
+  
+  FILE* f = fopen(name, "w");
+  putc('a', f);
+  fclose(f);
+  
+  wifstream in;
+  in.imbue(loc);
+  in.open(name);
+  
+  VERIFY( in.good() );
+  in.get();
+  VERIFY( !in.good() );
+  VERIFY( in.bad() );
+  VERIFY( !in.eof() );
+  
+  in.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11544-2.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11544-2.cc
new file mode 100644
index 000000000..f6a2eaca9
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11544-2.cc
@@ -0,0 +1,184 @@
+// Copyright (C) 2003, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <locale>
+#include <cstdio>
+#include <testsuite_hooks.h>
+
+template <typename InternT, typename StateT = mbstate_t>
+class checksumcvt : public std::codecvt<InternT, char, StateT>
+{
+  typedef std::codecvt<InternT, char, StateT> Base;
+  static const size_t width = sizeof(InternT) + 1;
+
+public:
+  typedef InternT intern_type;
+  typedef char extern_type;
+
+  explicit checksumcvt(size_t refs = 0)
+  : Base(refs)
+  { }
+
+protected:
+  virtual typename std::codecvt<InternT, char, StateT>::result
+  do_out(StateT&, const intern_type* from,
+	 const intern_type* from_end, const intern_type*& from_next,
+	 extern_type* to, extern_type* to_end,
+	 extern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(from_end - from),
+			  static_cast<size_t>(to_end - to) / width);
+
+    while (len--)
+      {
+	const char* p = reinterpret_cast<const char*>(from);
+	unsigned char checksum = 0;
+				
+	for (size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    *to++ = p[i];
+	    checksum ^= static_cast<unsigned char>(p[i]);
+	  }
+
+	*to++ = checksum;
+	++from;
+      }
+
+    from_next = from;
+    to_next = to;
+    return from_next == from_end ? std::codecvt<InternT, char, StateT>::ok
+           : std::codecvt<InternT, char, StateT>::partial;
+  }
+
+  virtual typename std::codecvt<InternT, char, StateT>::result
+  do_unshift(StateT&, extern_type* to,
+	     extern_type*, extern_type*& to_next) const
+  {
+    to_next = to;
+    return std::codecvt<InternT, char, StateT>::ok;
+  }
+
+  virtual typename std::codecvt<InternT, char, StateT>::result
+  do_in(StateT&, const extern_type* from,
+	const extern_type* from_end, const extern_type*& from_next,
+	intern_type* to, intern_type* to_end,
+	intern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(to_end - to),
+			  static_cast<size_t>(from_end - from) / width);
+			
+    while (len)
+      {
+	const char* f = from;
+	intern_type tmp;
+	char* p = reinterpret_cast<char*>(&tmp);
+	unsigned char checksum = 0;
+
+	for (size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    p[i] = *f;
+	    checksum ^= static_cast<unsigned char>(*f++);
+	  }
+
+	if (*f++ != checksum)
+	  break;
+
+	from = f;
+	*to++ = tmp;
+	len--;
+      }
+
+    from_next = from;
+    to_next = to;
+    return len ? std::codecvt<InternT, char, StateT>::error :
+      (from_next == from_end ? std::codecvt<InternT, char, StateT>::ok
+       : std::codecvt<InternT, char, StateT>::partial);
+  }
+
+  virtual int
+  do_encoding() const throw()
+  { return width; }
+
+  virtual int
+  do_length(StateT&, const extern_type* from,
+	    const extern_type* end, size_t max) const
+  {
+    size_t len = std::min(max, static_cast<size_t>(end - from) / width);
+
+    int ret = 0;
+    while (len--)
+      {
+	unsigned char checksum = 0;
+
+	for (size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    checksum ^= static_cast<unsigned char>(*from++);
+	  }
+
+	if (*from++ != checksum)
+	  break;
+
+	ret++;
+      }
+
+    return ret;
+  }
+
+  virtual int
+  do_max_length() const throw()
+  { return width; }
+
+  virtual bool
+  do_always_noconv() const throw()
+  { return false; }
+};
+
+// libstdc++/11544 (invalid byte sequence in file)
+void test02()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  locale loc(locale::classic(), new checksumcvt<wchar_t>);
+  
+  const char* name = "tmp_11544-2";
+  
+  FILE* f = fopen(name, "w");
+  VERIFY( fwrite("aaaab", 1, 5, f) == 5 );
+  fclose(f);
+  
+  wifstream in;
+  in.imbue(loc);
+  in.open(name);
+  
+  VERIFY( in.good() );
+  in.get();
+  VERIFY( !in.good() );
+  VERIFY( in.bad() );
+  VERIFY( !in.eof() );
+  
+  in.close();
+}
+
+int main()
+{
+  test02();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11603.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11603.cc
new file mode 100644
index 000000000..116c404a5
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11603.cc
@@ -0,0 +1,201 @@
+// Copyright (C) 2003, 2004, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+// { dg-require-binary-io "" }
+
+#include <fstream>
+#include <locale>
+#include <testsuite_hooks.h>
+
+template <typename InternT, typename StateT = std::mbstate_t>
+class checksumcvt : public std::codecvt<InternT, char, StateT>
+{
+  typedef std::codecvt<InternT, char, StateT> Base;
+  static const std::size_t width = sizeof(InternT) + 1;
+
+public:
+  typedef InternT intern_type;
+  typedef char extern_type;
+
+  explicit checksumcvt(std::size_t refs = 0)
+    : Base(refs)
+  { }
+
+protected:
+  virtual std::codecvt_base::result
+  do_out(StateT&, const intern_type* from,
+	 const intern_type* from_end, const intern_type*& from_next,
+	 extern_type* to, extern_type* to_end,
+	 extern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(from_end - from),
+			  static_cast<size_t>(to_end - to) / width);
+
+    while (len--)
+      {
+	const char* p =
+	  reinterpret_cast<const char*>(from);
+	unsigned char checksum = 0;
+				
+	for (std::size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    *to++ = p[i];
+	    checksum ^= static_cast<unsigned char>(p[i]);
+	  }
+
+	*to++ = checksum;
+	++from;
+      }
+
+    from_next = from;
+    to_next = to;
+    return from_next == from_end ? std::codecvt_base::ok 
+                                 : std::codecvt_base::partial;
+  }
+
+  virtual std::codecvt_base::result
+  do_unshift(StateT&, extern_type* to,
+	     extern_type*, extern_type*& to_next) const
+  {
+    to_next = to;
+    return std::codecvt_base::ok;
+  }
+
+  virtual std::codecvt_base::result
+  do_in(StateT&, const extern_type* from,
+	const extern_type* from_end, const extern_type*& from_next,
+	intern_type* to, intern_type* to_end,
+	intern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(to_end - to),
+			  static_cast<size_t>(from_end - from) / width);
+			
+    while (len)
+      {
+	const char* f = from;
+	intern_type tmp;
+	char* p = reinterpret_cast<char*>(&tmp);
+	unsigned char checksum = 0;
+
+	for (std::size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    p[i] = *f;
+	    checksum ^= static_cast<unsigned char>(*f++);
+	  }
+
+	if (*f++ != checksum)
+	  break;
+
+	from = f;
+	*to++ = tmp;
+	len--;
+      }
+
+    from_next = from;
+    to_next = to;
+    return len ? std::codecvt_base::error :
+      (from_next == from_end ? std::codecvt_base::ok
+                             : std::codecvt_base::partial);
+  }
+
+  virtual int
+  do_encoding() const throw()
+  { return width; }
+
+  virtual int
+  do_length(const StateT&, const extern_type* from,
+	    const extern_type* end, size_t max) const
+  {
+    size_t len = std::min(max,
+			  static_cast<size_t>(end - from) / width);
+
+    int ret = 0;
+    while (len--)
+      {
+	unsigned char checksum = 0;
+
+	for (std::size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    checksum ^= static_cast<unsigned char>(*from++);
+	  }
+
+	if (*from++ != checksum)
+	  break;
+
+	ret++;
+      }
+
+    return ret;
+  }
+
+  virtual int
+  do_max_length() const throw()
+  { return width; }
+
+  virtual bool
+  do_always_noconv() const throw()
+  { return false; }
+};
+
+class Buf : public std::wfilebuf
+{
+public:
+  std::streamsize pub_showmanyc()
+  { return showmanyc(); }
+  std::wfilebuf::int_type pub_underflow()
+  { return underflow(); }
+};
+
+// libstdc++/11603
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  filebuf fbout;
+  fbout.open("tmp_11603", ios_base::out);
+  fbout.sputn("aaaab", 5);
+  fbout.close();
+
+  locale loc(locale::classic(), new checksumcvt<wchar_t>);
+  
+  Buf fb;
+  fb.pubimbue(loc);
+  fb.open("tmp_11603", ios_base::in);
+  VERIFY( fb.pub_showmanyc() == 1 );
+  
+  try
+    {
+      wfilebuf::int_type ret = fb.pub_underflow();
+      VERIFY( ret != wfilebuf::traits_type::eof() );
+      fb.sbumpc();
+      ret = fb.pub_underflow();
+      VERIFY( ret == wfilebuf::traits_type::eof() );
+    }
+  catch (...)
+    { }
+
+  fb.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/2.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/2.cc
new file mode 100644
index 000000000..c6f30442c
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/2.cc
@@ -0,0 +1,112 @@
+// { dg-require-namedlocale "se_NO.UTF-8" }
+
+// 2003-09-04  Petur Runolfsson  <peturr02@ru.is>
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <locale>
+#include <fstream>
+#include <cstdio>
+#include <testsuite_hooks.h>
+
+// Test handing of UTF-8 in unbuffered basic_filebuf::underflow
+void test02()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+  const char name[] = "tmp_underflow-2.tst";
+
+  const char cstr[] =
+    "\x1\x2\x3\x4\x5\x6\x7\x8\x9\xa\xb\xc\xd\xe\xf\x10\x11\x12\x13"
+    "\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20!\"#$%&"
+    "'()*+,-./0123456789:;<=>?@}~\x7f\xc2\x80\xc2\x81\xc2\x82\xc2"
+    "\x83\xc2\x84\xc2\x85\xc2\x86\xc2\x87\xc2\x88\xc2\x89\xc2\x8a"
+    "\xc2\x8b\xc2\x8c\xc2\x8d\xc2\x8e\xc2\x8f\xc2\x90\xc2\x91\xc2"
+    "\x92\xc2\x93\xc2\x94\xc2\x95\xc2\x96\xc2\x97\xc2\x98\xc2\x99"
+    "\xc2\x9a\xc2\x9b\xc2\x9c\xc3\xba\xc3\xbb\xc3\xbc\xc3\xbd\xc3"
+    "\xbe\xc3\xbf\xc4\x80\xc4\x81\xc4\x82\xc4\x83\xc4\x84\xc4\x85"
+    "\xc4\x86\xc4\x87\xc4\x88\xc4\x89\xc4\x8a\xc4\x8b\xc4\x8c\xc4"
+    "\x8d\xc4\x8e\xc4\x8f\xc4\x90\xc4\x91\xc4\x92\xc4\x93\xc4\x94"
+    "\xc4\x95\xc4\x96\xc4\x97\xc4\x98\xc4\x99\xdf\xb8\xdf\xb9\xdf"
+    "\xba\xdf\xbb\xdf\xbc\xdf\xbd\xdf\xbe\xdf\xbf\xe0\xa0\x80\xe0"
+    "\xa0\x81\xe0\xa0\x82\xe0\xa0\x83\xe0\xa0\x84\xe0\xa0\x85\xe0"
+    "\xa0\x86\xe0\xa0\x87\xe0\xa0\x88\xe0\xa0\x89\xe0\xa0\x8a\xe0"
+    "\xa0\x8b\xe0\xa0\x8c\xe0\xa0\x8d\xe0\xa0\x8e\xe0\xa0\x8f\xe0"
+    "\xa0\x90\xe0\xa0\x91\xe0\xa0\x92\xe0\xa0\x93\xe0\xa0\x94\xe0"
+    "\xa0\x95\xe0\xa0\x96\xe0\xa0\x97\x1\x2\x4\x8\x10\x20@\xc2\x80"
+    "\xc4\x80\xc8\x80\xd0\x80\xe0\xa0\x80\xe1\x80\x80\xe2\x80\x80"
+    "\xe4\x80\x80\xe8\x80\x80\xf0\x90\x80\x80\xf0\xa0\x80\x80\xf1"
+    "\x80\x80\x80\xf2\x80\x80\x80\xf4\x80\x80\x80\xf8\x88\x80\x80"
+    "\x80\xf8\x90\x80\x80\x80\xf8\xa0\x80\x80\x80\xf9\x80\x80\x80"
+    "\x80\xfa\x80\x80\x80\x80\xfc\x84\x80\x80\x80\x80\xfc\x88\x80"
+    "\x80\x80\x80\xfc\x90\x80\x80\x80\x80\xfc\xa0\x80\x80\x80\x80"
+    "\xfd\x80\x80\x80\x80\x80";
+
+  const wchar_t wstr[] = {
+    0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc,
+    0xd, 0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, L'!',
+    L'"', L'#', L'$', L'%', L'&', L'\'', L'(', L')', L'*', L'+',
+    L',', L'-', L'.', L'/', L'0', L'1', L'2', L'3', L'4', L'5',
+    L'6', L'7', L'8', L'9', L':', L';', L'<', L'=', L'>', L'?',
+    L'@', L'}', L'~', 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
+    0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
+    0x9a, 0x9b, 0x9c, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0x100,
+    0x101, 0x102, 0x103, 0x104, 0x105, 0x106, 0x107, 0x108, 0x109,
+    0x10a, 0x10b, 0x10c, 0x10d, 0x10e, 0x10f, 0x110, 0x111, 0x112,
+    0x113, 0x114, 0x115, 0x116, 0x117, 0x118, 0x119, 0x7f8, 0x7f9,
+    0x7fa, 0x7fb, 0x7fc, 0x7fd, 0x7fe, 0x7ff, 0x800, 0x801, 0x802,
+    0x803, 0x804, 0x805, 0x806, 0x807, 0x808, 0x809, 0x80a, 0x80b,
+    0x80c, 0x80d, 0x80e, 0x80f, 0x810, 0x811, 0x812, 0x813, 0x814,
+    0x815, 0x816, 0x817, 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, L'@',
+    0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000, 0x8000,
+    0x10000, 0x20000, 0x40000, 0x80000, 0x100000, 0x200000, 0x400000,
+    0x800000, 0x1000000, 0x2000000, 0x4000000, 0x8000000, 0x10000000,
+    0x20000000, 0x40000000, 0x0
+  };
+
+  const size_t clen = sizeof(cstr) / sizeof(cstr[0]);
+  const size_t wlen = sizeof(wstr) / sizeof(wstr[0]);
+
+  locale loc = locale("se_NO.UTF-8");
+
+  FILE* file = fopen(name, "w");
+  fwrite(cstr, 1, clen, file);
+  fclose(file);
+
+  wchar_t wbuf[wlen + 1];
+  
+  wfilebuf fb;
+  fb.pubimbue(loc);
+  fb.pubsetbuf(0, 0);
+  fb.open(name, ios_base::in);
+  streamsize n = fb.sgetn(wbuf, wlen + 1);
+  fb.close();
+
+  VERIFY( n == static_cast<streamsize>(wlen) );
+  VERIFY( !wmemcmp(wbuf, wstr, wlen) );
+}
+
+int main ()
+{
+  test02();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/3.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/3.cc
new file mode 100644
index 000000000..42892e4ac
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/3.cc
@@ -0,0 +1,117 @@
+// { dg-require-namedlocale "se_NO.UTF-8" }
+
+// 2003-09-04  Petur Runolfsson  <peturr02@ru.is>
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <locale>
+#include <fstream>
+#include <cstdio>
+#include <testsuite_hooks.h>
+
+// Test handing of UTF-8 in basic_filebuf::underflow
+void test03()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+  const char name[] = "tmp_underflow-3.tst";
+
+  const char cstr[] =
+    "\x1\x2\x3\x4\x5\x6\x7\x8\x9\xa\xb\xc\xd\xe\xf\x10\x11\x12\x13"
+    "\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20!\"#$%&"
+    "'()*+,-./0123456789:;<=>?@}~\x7f\xc2\x80\xc2\x81\xc2\x82\xc2"
+    "\x83\xc2\x84\xc2\x85\xc2\x86\xc2\x87\xc2\x88\xc2\x89\xc2\x8a"
+    "\xc2\x8b\xc2\x8c\xc2\x8d\xc2\x8e\xc2\x8f\xc2\x90\xc2\x91\xc2"
+    "\x92\xc2\x93\xc2\x94\xc2\x95\xc2\x96\xc2\x97\xc2\x98\xc2\x99"
+    "\xc2\x9a\xc2\x9b\xc2\x9c\xc3\xba\xc3\xbb\xc3\xbc\xc3\xbd\xc3"
+    "\xbe\xc3\xbf\xc4\x80\xc4\x81\xc4\x82\xc4\x83\xc4\x84\xc4\x85"
+    "\xc4\x86\xc4\x87\xc4\x88\xc4\x89\xc4\x8a\xc4\x8b\xc4\x8c\xc4"
+    "\x8d\xc4\x8e\xc4\x8f\xc4\x90\xc4\x91\xc4\x92\xc4\x93\xc4\x94"
+    "\xc4\x95\xc4\x96\xc4\x97\xc4\x98\xc4\x99\xdf\xb8\xdf\xb9\xdf"
+    "\xba\xdf\xbb\xdf\xbc\xdf\xbd\xdf\xbe\xdf\xbf\xe0\xa0\x80\xe0"
+    "\xa0\x81\xe0\xa0\x82\xe0\xa0\x83\xe0\xa0\x84\xe0\xa0\x85\xe0"
+    "\xa0\x86\xe0\xa0\x87\xe0\xa0\x88\xe0\xa0\x89\xe0\xa0\x8a\xe0"
+    "\xa0\x8b\xe0\xa0\x8c\xe0\xa0\x8d\xe0\xa0\x8e\xe0\xa0\x8f\xe0"
+    "\xa0\x90\xe0\xa0\x91\xe0\xa0\x92\xe0\xa0\x93\xe0\xa0\x94\xe0"
+    "\xa0\x95\xe0\xa0\x96\xe0\xa0\x97\x1\x2\x4\x8\x10\x20@\xc2\x80"
+    "\xc4\x80\xc8\x80\xd0\x80\xe0\xa0\x80\xe1\x80\x80\xe2\x80\x80"
+    "\xe4\x80\x80\xe8\x80\x80\xf0\x90\x80\x80\xf0\xa0\x80\x80\xf1"
+    "\x80\x80\x80\xf2\x80\x80\x80\xf4\x80\x80\x80\xf8\x88\x80\x80"
+    "\x80\xf8\x90\x80\x80\x80\xf8\xa0\x80\x80\x80\xf9\x80\x80\x80"
+    "\x80\xfa\x80\x80\x80\x80\xfc\x84\x80\x80\x80\x80\xfc\x88\x80"
+    "\x80\x80\x80\xfc\x90\x80\x80\x80\x80\xfc\xa0\x80\x80\x80\x80"
+    "\xfd\x80\x80\x80\x80\x80";
+
+  const wchar_t wstr[] = {
+    0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc,
+    0xd, 0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, L'!',
+    L'"', L'#', L'$', L'%', L'&', L'\'', L'(', L')', L'*', L'+',
+    L',', L'-', L'.', L'/', L'0', L'1', L'2', L'3', L'4', L'5',
+    L'6', L'7', L'8', L'9', L':', L';', L'<', L'=', L'>', L'?',
+    L'@', L'}', L'~', 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
+    0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
+    0x9a, 0x9b, 0x9c, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0x100,
+    0x101, 0x102, 0x103, 0x104, 0x105, 0x106, 0x107, 0x108, 0x109,
+    0x10a, 0x10b, 0x10c, 0x10d, 0x10e, 0x10f, 0x110, 0x111, 0x112,
+    0x113, 0x114, 0x115, 0x116, 0x117, 0x118, 0x119, 0x7f8, 0x7f9,
+    0x7fa, 0x7fb, 0x7fc, 0x7fd, 0x7fe, 0x7ff, 0x800, 0x801, 0x802,
+    0x803, 0x804, 0x805, 0x806, 0x807, 0x808, 0x809, 0x80a, 0x80b,
+    0x80c, 0x80d, 0x80e, 0x80f, 0x810, 0x811, 0x812, 0x813, 0x814,
+    0x815, 0x816, 0x817, 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, L'@',
+    0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000, 0x8000,
+    0x10000, 0x20000, 0x40000, 0x80000, 0x100000, 0x200000, 0x400000,
+    0x800000, 0x1000000, 0x2000000, 0x4000000, 0x8000000, 0x10000000,
+    0x20000000, 0x40000000, 0x0
+  };
+
+  const size_t clen = sizeof(cstr) / sizeof(cstr[0]);
+  const size_t wlen = sizeof(wstr) / sizeof(wstr[0]);
+
+  const int loops = 2 * BUFSIZ / wlen;
+  locale loc = locale("se_NO.UTF-8");
+
+  FILE* file = fopen(name, "w");
+  for (int i = 0; i < loops; ++i)
+    fwrite(cstr, 1, clen, file);
+  fclose(file);
+
+  wchar_t wbuf[wlen];
+  
+  wfilebuf fb;
+  fb.pubimbue(loc);
+  fb.open(name, ios_base::in);
+  for (int i = 0; i < loops; ++i)
+    {
+      streamsize n = fb.sgetn(wbuf, wlen);
+      VERIFY( n == static_cast<streamsize>(wlen) );
+      VERIFY( !wmemcmp(wbuf, wstr, wlen) );
+    }
+
+  VERIFY( fb.sgetc() == wfilebuf::traits_type::eof() );
+  fb.close();
+}
+
+int main ()
+{
+  test03();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/4.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/4.cc
new file mode 100644
index 000000000..6e63db09d
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/4.cc
@@ -0,0 +1,55 @@
+// { dg-require-namedlocale "se_NO.UTF-8" }
+
+// 2003-09-04  Petur Runolfsson  <peturr02@ru.is>
+// Adapted from 27_io/basic_filebuf/underflow/char/2.cc
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <locale>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std;
+
+  locale loc (locale("se_NO.UTF-8"));
+  wfilebuf fb_out, fb_in_out;
+  fb_out.pubimbue(loc);
+  fb_in_out.pubimbue(loc);
+  
+  fb_out.open("tmp_underflow.tst", ios::out);
+  fb_out.sputc(L'S');
+  fb_out.sputc(L'T');
+  fb_out.close();
+
+  fb_in_out.open("tmp_underflow.tst", ios::in | ios::out);
+  while (fb_in_out.sbumpc() != wfilebuf::traits_type::eof());
+
+  VERIFY( fb_in_out.sputc(L'x') == L'x' );
+  fb_in_out.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/45841.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/45841.cc
new file mode 100644
index 000000000..2d7cb7af2
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/45841.cc
@@ -0,0 +1,41 @@
+// Copyright (C) 2010 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std;
+
+  wfilebuf fb_in_out;
+
+  fb_in_out.open("tmp_underflow.tst", ios::in | ios::out | ios::trunc);
+
+  VERIFY( fb_in_out.sputc(L'x') == L'x' );
+  VERIFY( fb_in_out.sgetc() == wfilebuf::traits_type::eof() );
+  fb_in_out.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/5.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/5.cc
new file mode 100644
index 000000000..4c4b8d3b4
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/5.cc
@@ -0,0 +1,74 @@
+// { dg-require-namedlocale "se_NO.UTF-8" }
+
+// 2003-09-04  Petur Runolfsson  <peturr02@ru.is>
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <locale>
+#include <fstream>
+#include <cstdio>
+#include <testsuite_hooks.h>
+
+// Test that unbuffered really means unbuffered for UTF-8
+void test05()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+  const char* name = "tmp_underflow-5";
+
+  wfilebuf fb;
+  fb.pubsetbuf(0, 0);
+  fb.pubimbue(locale("se_NO.UTF-8"));
+
+  FILE* file = fopen(name, "w");
+  setvbuf(file, 0, _IONBF, 0);
+  fputs("abcde", file);
+
+  fb.open(name, ios_base::in);
+  VERIFY( fb.sbumpc() == L'a' );
+  
+  fseek(file, 1, SEEK_SET);
+  fputc('0', file);
+
+  VERIFY( fb.sbumpc() == L'0' );
+  VERIFY( fb.sbumpc() == L'c' );
+
+  fputc('1', file);
+  fputc('2', file);
+
+  VERIFY( fb.sbumpc() == L'2' );
+  VERIFY( fb.sbumpc() == L'e' );
+  VERIFY( fb.sbumpc() == WEOF );
+
+  fputc('3', file);
+  fputc('4', file);
+
+  VERIFY( fb.sbumpc() == L'4' );
+  VERIFY( fb.sbumpc() == WEOF );
+
+  fb.close();
+  fclose(file);
+}
+
+int main()
+{
+  test05();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/9178.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/9178.cc
new file mode 100644
index 000000000..344db32d7
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/9178.cc
@@ -0,0 +1,204 @@
+// Copyright (C) 2003, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <string>
+#include <iterator>
+#include <algorithm>
+#include <locale>
+#include <testsuite_hooks.h>
+
+template <typename InternT, typename StateT = mbstate_t>
+class checksumcvt : public std::codecvt<InternT, char, StateT>
+{
+  typedef std::codecvt<InternT, char, StateT> Base;
+  static const size_t width = sizeof(InternT) + 1;
+
+public:
+  typedef InternT intern_type;
+  typedef char extern_type;
+
+  explicit checksumcvt(size_t refs = 0)
+  : Base(refs)
+  { }
+
+protected:
+  virtual typename std::codecvt<InternT, char, StateT>::result
+  do_out(StateT&, const intern_type* from,
+	 const intern_type* from_end, const intern_type*& from_next,
+	 extern_type* to, extern_type* to_end,
+	 extern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(from_end - from),
+			  static_cast<size_t>(to_end - to) / width);
+
+    while (len--)
+      {
+	const char* p = reinterpret_cast<const char*>(from);
+	unsigned char checksum = 0;
+				
+	for (size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    *to++ = p[i];
+	    checksum ^= static_cast<unsigned char>(p[i]);
+	  }
+
+	*to++ = checksum;
+	++from;
+      }
+
+    from_next = from;
+    to_next = to;
+    return from_next == from_end ? std::codecvt<InternT, char, StateT>::ok
+           : std::codecvt<InternT, char, StateT>::partial;
+  }
+
+  virtual typename std::codecvt<InternT, char, StateT>::result
+  do_unshift(StateT&, extern_type* to,
+	     extern_type*, extern_type*& to_next) const
+  {
+    to_next = to;
+    return std::codecvt<InternT, char, StateT>::ok;
+  }
+
+  virtual typename std::codecvt<InternT, char, StateT>::result
+  do_in(StateT&, const extern_type* from,
+	const extern_type* from_end, const extern_type*& from_next,
+	intern_type* to, intern_type* to_end,
+	intern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(to_end - to),
+			  static_cast<size_t>(from_end - from) / width);
+			
+    while (len)
+      {
+	const char* f = from;
+	intern_type tmp;
+	char* p = reinterpret_cast<char*>(&tmp);
+	unsigned char checksum = 0;
+
+	for (size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    p[i] = *f;
+	    checksum ^= static_cast<unsigned char>(*f++);
+	  }
+
+	if (*f++ != checksum)
+	  break;
+
+	from = f;
+	*to++ = tmp;
+	len--;
+      }
+
+    from_next = from;
+    to_next = to;
+    return len ? std::codecvt<InternT, char, StateT>::error :
+      (from_next == from_end ? std::codecvt<InternT, char, StateT>::ok
+       : std::codecvt<InternT, char, StateT>::partial);
+  }
+
+  virtual int
+  do_encoding() const throw()
+  {
+    return width;
+  }
+
+  virtual int
+  do_length(StateT&, const extern_type* from,
+	    const extern_type* end, size_t max) const
+  {
+    size_t len = std::min(max, static_cast<size_t>(end - from) / width);
+
+    int ret = 0;
+    while (len--)
+      {
+	unsigned char checksum = 0;
+
+	for (size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    checksum ^= static_cast<unsigned char>(*from++);
+	  }
+
+	if (*from++ != checksum)
+	  break;
+
+	ret++;
+      }
+
+    return ret;
+  }
+
+  virtual int
+  do_max_length() const throw()
+  {
+    return width;
+  }
+
+  virtual bool
+  do_always_noconv() const throw()
+  {
+    return false;
+  }
+};
+
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  locale loc;
+  loc = locale(loc, new checksumcvt<wchar_t>);
+
+  wfilebuf fbuf1;
+  fbuf1.pubimbue(loc);
+  fbuf1.open("tmp_9178", ios_base::out | ios_base::trunc);
+	
+  string tmpstr = "abcdefghijklmnopqrstuvwxyz0123456789 \t\n";
+
+  wifstream stream;
+  wstring str1;
+
+  while (str1.length() < 20000) 
+    {
+      transform(tmpstr.begin(), tmpstr.end(),
+		back_inserter(str1),
+		bind1st(std::mem_fun(&std::wios::widen), &stream));
+    }
+	
+  fbuf1.sputn(str1.data(), str1.size());
+  fbuf1.close();
+
+  wfilebuf fbuf2;
+  fbuf2.pubimbue(loc);
+  fbuf2.open("tmp_9178", std::ios_base::in);
+	
+  wstring str2;
+  copy(istreambuf_iterator<wchar_t>(&fbuf2),
+       istreambuf_iterator<wchar_t>(),
+       back_inserter(str2));
+
+  VERIFY( str1 == str2 );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/9520.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/9520.cc
new file mode 100644
index 000000000..f791b86aa
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/9520.cc
@@ -0,0 +1,61 @@
+// { dg-require-namedlocale "de_DE.ISO-8859-15@euro" }
+
+// 2003-05-03  Petur Runolfsson <peturr02@ru.is>
+
+// Copyright (C) 2003, 2005, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <testsuite_hooks.h>
+#include <fstream>
+#include <cstdio>
+
+// libstdc++/9520
+void test01()
+{
+  using namespace std;
+
+  bool test __attribute__((unused)) = true;
+  const char* name = "tmp_9520";
+
+  FILE* file = fopen(name, "w");
+  for (int i = 1; i < 256; ++i)
+    putc(static_cast<unsigned char>(i), file);
+  fclose(file);
+
+  locale loc (locale("de_DE.ISO-8859-15@euro"));
+  wchar_t buf[1];
+  wfilebuf fb;
+  fb.pubimbue(loc);
+  fb.pubsetbuf(buf, 1);
+  fb.open(name, ios_base::in);
+
+  for (int j = 1; j < 256; ++j)
+    {
+      wfilebuf::int_type c1 = fb.sgetc();
+      VERIFY( c1 != wfilebuf::traits_type::eof() );
+      wfilebuf::int_type c2 = fb.sbumpc();
+      VERIFY( c1 == c2 );
+    }
+
+  fb.close();
+}
+
+int main()
+{
+  test01();  
+  return 0;
+}