--- /dev/null
+// File descriptor layer for filebuf -*- C++ -*-
+
+// Copyright (C) 2002, 2003, 2004, 2005, 2009, 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.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file ext/stdio_filebuf.h
+ * This file is a GNU extension to the Standard C++ Library.
+ */
+
+#ifndef _STDIO_FILEBUF_H
+#define _STDIO_FILEBUF_H 1
+
+#pragma GCC system_header
+
+#include <fstream>
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @brief Provides a layer of compatibility for C/POSIX.
+ * @ingroup io
+ *
+ * This GNU extension provides extensions for working with standard C
+ * FILE*'s and POSIX file descriptors. It must be instantiated by the
+ * user with the type of character used in the file stream, e.g.,
+ * stdio_filebuf<char>.
+ */
+ template<typename _CharT, typename _Traits = std::char_traits<_CharT> >
+ class stdio_filebuf : public std::basic_filebuf<_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;
+ typedef std::size_t size_t;
+
+ public:
+ /**
+ * deferred initialization
+ */
+ stdio_filebuf() : std::basic_filebuf<_CharT, _Traits>() {}
+
+ /**
+ * @param __fd An open file descriptor.
+ * @param __mode Same meaning as in a standard filebuf.
+ * @param __size Optimal or preferred size of internal buffer,
+ * in chars.
+ *
+ * This constructor associates a file stream buffer with an open
+ * POSIX file descriptor. The file descriptor will be automatically
+ * closed when the stdio_filebuf is closed/destroyed.
+ */
+ stdio_filebuf(int __fd, std::ios_base::openmode __mode,
+ size_t __size = static_cast<size_t>(BUFSIZ));
+
+ /**
+ * @param __f An open @c FILE*.
+ * @param __mode Same meaning as in a standard filebuf.
+ * @param __size Optimal or preferred size of internal buffer,
+ * in chars. Defaults to system's @c BUFSIZ.
+ *
+ * This constructor associates a file stream buffer with an open
+ * C @c FILE*. The @c FILE* will not be automatically closed when the
+ * stdio_filebuf is closed/destroyed.
+ */
+ stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
+ size_t __size = static_cast<size_t>(BUFSIZ));
+
+ /**
+ * Closes the external data stream if the file descriptor constructor
+ * was used.
+ */
+ virtual
+ ~stdio_filebuf();
+
+ /**
+ * @return The underlying file descriptor.
+ *
+ * Once associated with an external data stream, this function can be
+ * used to access the underlying POSIX file descriptor. Note that
+ * there is no way for the library to track what you do with the
+ * descriptor, so be careful.
+ */
+ int
+ fd() { return this->_M_file.fd(); }
+
+ /**
+ * @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*
+ file() { return this->_M_file.file(); }
+ };
+
+ template<typename _CharT, typename _Traits>
+ stdio_filebuf<_CharT, _Traits>::~stdio_filebuf()
+ { }
+
+ template<typename _CharT, typename _Traits>
+ stdio_filebuf<_CharT, _Traits>::
+ stdio_filebuf(int __fd, std::ios_base::openmode __mode, size_t __size)
+ {
+ this->_M_file.sys_open(__fd, __mode);
+ if (this->is_open())
+ {
+ this->_M_mode = __mode;
+ this->_M_buf_size = __size;
+ this->_M_allocate_internal_buffer();
+ this->_M_reading = false;
+ this->_M_writing = false;
+ this->_M_set_buffer(-1);
+ }
+ }
+
+ template<typename _CharT, typename _Traits>
+ stdio_filebuf<_CharT, _Traits>::
+ stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
+ size_t __size)
+ {
+ this->_M_file.sys_open(__f, __mode);
+ if (this->is_open())
+ {
+ this->_M_mode = __mode;
+ this->_M_buf_size = __size;
+ this->_M_allocate_internal_buffer();
+ this->_M_reading = false;
+ this->_M_writing = false;
+ this->_M_set_buffer(-1);
+ }
+ }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif
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