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diff --git a/libstdc++/include/ext/stdio_sync_filebuf.h b/libstdc++/include/ext/stdio_sync_filebuf.h
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+// Iostreams wrapper for stdio FILE* -*- C++ -*-
+
+// Copyright (C) 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// 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.
+
+/** @file ext/stdio_sync_filebuf.h
+ * This file is a GNU extension to the Standard C++ Library.
+ */
+
+#ifndef _STDIO_SYNC_FILEBUF_H
+#define _STDIO_SYNC_FILEBUF_H 1
+
+#pragma GCC system_header
+
+#include <streambuf>
+#include <unistd.h>
+#include <cstdio>
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+#include <cwchar>
+#endif
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+ /// @brief class stdio_sync_filebuf.
+ template<typename _CharT, typename _Traits = std::char_traits<_CharT> >
+ class stdio_sync_filebuf : public std::basic_streambuf<_CharT, _Traits>
+ {
+ public:
+ // Types:
+ typedef _CharT char_type;
+ typedef _Traits traits_type;
+ typedef typename traits_type::int_type int_type;
+ typedef typename traits_type::pos_type pos_type;
+ typedef typename traits_type::off_type off_type;
+
+ private:
+ // Underlying stdio FILE
+ std::__c_file* const _M_file;
+
+ // Last character gotten. This is used when pbackfail is
+ // called from basic_streambuf::sungetc()
+ int_type _M_unget_buf;
+
+ public:
+ explicit
+ stdio_sync_filebuf(std::__c_file* __f)
+ : _M_file(__f), _M_unget_buf(traits_type::eof())
+ { }
+
+ /**
+ * @return The underlying FILE*.
+ *
+ * This function can be used to access the underlying "C" file pointer.
+ * Note that there is no way for the library to track what you do
+ * with the file, so be careful.
+ */
+ std::__c_file* const
+ file() { return this->_M_file; }
+
+ protected:
+ int_type
+ syncgetc();
+
+ int_type
+ syncungetc(int_type __c);
+
+ int_type
+ syncputc(int_type __c);
+
+ virtual int_type
+ underflow()
+ {
+ int_type __c = this->syncgetc();
+ return this->syncungetc(__c);
+ }
+
+ virtual int_type
+ uflow()
+ {
+ // Store the gotten character in case we need to unget it.
+ _M_unget_buf = this->syncgetc();
+ return _M_unget_buf;
+ }
+
+ virtual int_type
+ pbackfail(int_type __c = traits_type::eof())
+ {
+ int_type __ret;
+ const int_type __eof = traits_type::eof();
+
+ // Check if the unget or putback was requested
+ if (traits_type::eq_int_type(__c, __eof)) // unget
+ {
+ if (!traits_type::eq_int_type(_M_unget_buf, __eof))
+ __ret = this->syncungetc(_M_unget_buf);
+ else // buffer invalid, fail.
+ __ret = __eof;
+ }
+ else // putback
+ __ret = this->syncungetc(__c);
+
+ // The buffered character is no longer valid, discard it.
+ _M_unget_buf = __eof;
+ return __ret;
+ }
+
+ virtual std::streamsize
+ xsgetn(char_type* __s, std::streamsize __n);
+
+ virtual int_type
+ overflow(int_type __c = traits_type::eof())
+ {
+ int_type __ret;
+ if (traits_type::eq_int_type(__c, traits_type::eof()))
+ {
+ if (std::fflush(_M_file))
+ __ret = traits_type::eof();
+ else
+ __ret = traits_type::not_eof(__c);
+ }
+ else
+ __ret = this->syncputc(__c);
+ return __ret;
+ }
+
+ virtual std::streamsize
+ xsputn(const char_type* __s, std::streamsize __n);
+
+ virtual int
+ sync()
+ { return std::fflush(_M_file); }
+
+ virtual std::streampos
+ seekoff(std::streamoff __off, std::ios_base::seekdir __dir,
+ std::ios_base::openmode = std::ios_base::in | std::ios_base::out)
+ {
+ std::streampos __ret(std::streamoff(-1));
+ int __whence;
+ if (__dir == std::ios_base::beg)
+ __whence = SEEK_SET;
+ else if (__dir == std::ios_base::cur)
+ __whence = SEEK_CUR;
+ else
+ __whence = SEEK_END;
+#ifdef _GLIBCXX_USE_LFS
+ if (!fseeko64(_M_file, __off, __whence))
+ __ret = std::streampos(ftello64(_M_file));
+#else
+ if (!fseek(_M_file, __off, __whence))
+ __ret = std::streampos(std::ftell(_M_file));
+#endif
+ return __ret;
+ }
+
+ virtual std::streampos
+ seekpos(std::streampos __pos,
+ std::ios_base::openmode __mode =
+ std::ios_base::in | std::ios_base::out)
+ { return seekoff(std::streamoff(__pos), std::ios_base::beg, __mode); }
+ };
+
+ template<>
+ inline stdio_sync_filebuf<char>::int_type
+ stdio_sync_filebuf<char>::syncgetc()
+ { return std::getc(_M_file); }
+
+ template<>
+ inline stdio_sync_filebuf<char>::int_type
+ stdio_sync_filebuf<char>::syncungetc(int_type __c)
+ { return std::ungetc(__c, _M_file); }
+
+ template<>
+ inline stdio_sync_filebuf<char>::int_type
+ stdio_sync_filebuf<char>::syncputc(int_type __c)
+ { return std::putc(__c, _M_file); }
+
+ template<>
+ inline std::streamsize
+ stdio_sync_filebuf<char>::xsgetn(char* __s, std::streamsize __n)
+ {
+ std::streamsize __ret = std::fread(__s, 1, __n, _M_file);
+ if (__ret > 0)
+ _M_unget_buf = traits_type::to_int_type(__s[__ret - 1]);
+ else
+ _M_unget_buf = traits_type::eof();
+ return __ret;
+ }
+
+ template<>
+ inline std::streamsize
+ stdio_sync_filebuf<char>::xsputn(const char* __s, std::streamsize __n)
+ { return std::fwrite(__s, 1, __n, _M_file); }
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ template<>
+ inline stdio_sync_filebuf<wchar_t>::int_type
+ stdio_sync_filebuf<wchar_t>::syncgetc()
+ { return std::getwc(_M_file); }
+
+ template<>
+ inline stdio_sync_filebuf<wchar_t>::int_type
+ stdio_sync_filebuf<wchar_t>::syncungetc(int_type __c)
+ { return std::ungetwc(__c, _M_file); }
+
+ template<>
+ inline stdio_sync_filebuf<wchar_t>::int_type
+ stdio_sync_filebuf<wchar_t>::syncputc(int_type __c)
+ { return std::putwc(__c, _M_file); }
+
+ template<>
+ inline std::streamsize
+ stdio_sync_filebuf<wchar_t>::xsgetn(wchar_t* __s, std::streamsize __n)
+ {
+ std::streamsize __ret = 0;
+ const int_type __eof = traits_type::eof();
+ while (__n--)
+ {
+ int_type __c = this->syncgetc();
+ if (traits_type::eq_int_type(__c, __eof))
+ break;
+ __s[__ret] = traits_type::to_char_type(__c);
+ ++__ret;
+ }
+
+ if (__ret > 0)
+ _M_unget_buf = traits_type::to_int_type(__s[__ret - 1]);
+ else
+ _M_unget_buf = traits_type::eof();
+ return __ret;
+ }
+
+ template<>
+ inline std::streamsize
+ stdio_sync_filebuf<wchar_t>::xsputn(const wchar_t* __s,
+ std::streamsize __n)
+ {
+ std::streamsize __ret = 0;
+ const int_type __eof = traits_type::eof();
+ while (__n--)
+ {
+ if (traits_type::eq_int_type(this->syncputc(*__s++), __eof))
+ break;
+ ++__ret;
+ }
+ return __ret;
+ }
+#endif
+
+#if _GLIBCXX_EXTERN_TEMPLATE
+ extern template class stdio_sync_filebuf<char>;
+#ifdef _GLIBCXX_USE_WCHAR_T
+ extern template class stdio_sync_filebuf<wchar_t>;
+#endif
+#endif
+
+_GLIBCXX_END_NAMESPACE
+
+#endif
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