libstdc++-v3/include/bits/fstream.tcc - gcc.git - Git at Google

 // File based streams -*- C++ -*-

 // Copyright (C) 1997, 1998, 1999, 2000, 2001 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.

 //
 // ISO C++ 14882: 27.8  File-based streams
 //

 #ifndef _CPP_BITS_FSTREAM_TCC
 #define _CPP_BITS_FSTREAM_TCC 1

 namespace std
 {
   template<typename _CharT, typename _Traits>
     void
     basic_filebuf<_CharT, _Traits>::
     _M_allocate_file()
     {
       if (!_M_file)
 	{
 	  _M_buf_unified = true; // Tie input to output for basic_filebuf.
 	  try
 	    { _M_file = new __file_type(&_M_lock); }
 	  catch(...)
 	    {
 	      delete _M_file;
 	      __throw_exception_again;
 	    }
 	}
     }

   template<typename _CharT, typename _Traits>
     void
     basic_filebuf<_CharT, _Traits>::
     _M_allocate_internal_buffer()
     {
       if (!_M_buf && _M_buf_size_opt)
 	{
 	  _M_buf_size = _M_buf_size_opt;

 	  // Allocate internal buffer.
 	  try { _M_buf = new char_type[_M_buf_size]; }
 	  catch(...)
 	    {
 	      delete [] _M_buf;
 	      __throw_exception_again;
 	    }
 	  _M_buf_allocated = true;
 	}
     }

   // Both close and setbuf need to deallocate internal buffers, if it exists.
   template<typename _CharT, typename _Traits>
     void
     basic_filebuf<_CharT, _Traits>::
     _M_destroy_internal_buffer()
     {
       if (_M_buf_allocated)
 	{
 	  delete [] _M_buf;
 	  _M_buf = NULL;
 	  _M_buf_allocated = false;
 	  this->setg(NULL, NULL, NULL);
 	  this->setp(NULL, NULL);
 	}
     }

  template<typename _CharT, typename _Traits>
     void
     basic_filebuf<_CharT, _Traits>::
     _M_allocate_pback_buffer()
     {
       if (!_M_pback && _M_pback_size)
 	{
 	  // Allocate pback buffer.
 	  try
 	    { _M_pback = new char_type[_M_pback_size]; }
 	  catch(...)
 	    {
 	      delete [] _M_pback;
 	      __throw_exception_again;
 	    }
 	}
     }

   template<typename _CharT, typename _Traits>
     basic_filebuf<_CharT, _Traits>::
     basic_filebuf()
     : __streambuf_type(), _M_file(NULL), _M_state_cur(__state_type()),
     _M_state_beg(__state_type()), _M_buf_allocated(false),
     _M_last_overflowed(false)
     { }

   template<typename _CharT, typename _Traits>
     basic_filebuf<_CharT, _Traits>::
     basic_filebuf(__c_file_type* __f, ios_base::openmode __mode, int_type __s)
     : __streambuf_type(),  _M_file(NULL), _M_state_cur(__state_type()),
     _M_state_beg(__state_type()), _M_buf_allocated(false),
     _M_last_overflowed(false)
     {
       _M_allocate_file();
       _M_file->sys_open(__f, __mode);
       if (this->is_open())
 	{
 	  _M_mode = __mode;
 	  if (__s)
 	    {
 	      _M_buf_size_opt = __s;
 	      _M_allocate_internal_buffer();
 	      _M_set_indeterminate();
 	    }
 	  _M_allocate_pback_buffer();
 	}
     }

   template<typename _CharT, typename _Traits>
     int
     basic_filebuf<_CharT, _Traits>::
     fd()
     {
       return _M_file->fd();
     }

   template<typename _CharT, typename _Traits>
     typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
     basic_filebuf<_CharT, _Traits>::
     open(const char* __s, ios_base::openmode __mode)
     {
       __filebuf_type *__ret = NULL;
       if (!this->is_open())
 	{
 	  _M_allocate_file();
 	  _M_file->open(__s, __mode);
 	  if (this->is_open())
 	    {
 	      _M_allocate_internal_buffer();
 	      _M_allocate_pback_buffer();
 	      _M_mode = __mode;

 	      // For time being, set both (in/out) sets  of pointers.
 	      _M_set_indeterminate();
 	      if (__mode & ios_base::ate
 		  && this->seekoff(0, ios_base::end, __mode) < 0)
 		this->close();
 	      __ret = this;
 	    }
 	}
       return __ret;
     }

   template<typename _CharT, typename _Traits>
     typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
     basic_filebuf<_CharT, _Traits>::
     close()
     {
       __filebuf_type *__ret = NULL;
       if (this->is_open())
 	{
 	  bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
 	  if (__testput)
 	    _M_really_overflow(traits_type::eof());

 	  // NB: Do this here so that re-opened filebufs will be cool...
 	  _M_pback_destroy();

 #if 0
 	  // XXX not done
 	  if (_M_last_overflowed)
 	    {
 	      _M_output_unshift();
 	      _M_really_overflow(traits_type::eof());
 	    }
 #endif

 	  _M_mode = ios_base::openmode(0);
 	  _M_destroy_internal_buffer();

 	  if (_M_pback)
 	    {
 	      delete [] _M_pback;
 	      _M_pback = NULL;
 	    }
 	  __ret = this;
 	}

       // Can actually allocate this file as part of an open and never
       // have it be opened.....
       if (_M_file)
 	{
 	  delete _M_file;
 	  _M_file = NULL;
 	}
       _M_last_overflowed = false;
       return __ret;
     }

   template<typename _CharT, typename _Traits>
     streamsize
     basic_filebuf<_CharT, _Traits>::
     showmanyc()
     {
       streamsize __ret = -1;
       bool __testin = _M_mode & ios_base::in;

       if (__testin)
 	{
 	  if (_M_in_cur < _M_in_end)
 	    __ret = _M_in_end - _M_in_cur;
 	  else
 	    __ret = 0;
 	}
       _M_last_overflowed = false;
       return __ret;
     }

   template<typename _CharT, typename _Traits>
     typename basic_filebuf<_CharT, _Traits>::int_type
     basic_filebuf<_CharT, _Traits>::
     underflow()
     {
       int_type __ret = traits_type::eof();
       bool __testin = _M_mode & ios_base::in;
       bool __testout = _M_mode & ios_base::out;

       // XXX Should re-enable codecvt bits disabled after 2.90.8.
       if (__testin)
 	{
 	  // Check for pback madness, and if so swich back to the
 	  // normal buffers and jet outta here before expensive
 	  // fileops happen...
 	  if (_M_pback_init)
 	    {
 	      _M_pback_destroy();
 	      if (_M_in_cur < _M_in_end)
 		return traits_type::to_int_type(*_M_in_cur);
 	    }

 	  bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
 	  bool __testinit = _M_is_indeterminate();
 	  // Sync internal and external buffers.
 	  // NB: __testget -> __testput as _M_buf_unified here.
 	  if (__testget)
 	    {
 	      if (__testout)
 		_M_really_overflow();
 #if _GLIBCPP_AVOID_FSEEK
 	      else if ((_M_in_cur - _M_in_beg) == 1)
 		_M_file->sys_getc();
 #endif
 	      else
 		_M_file->seekoff(_M_in_cur - _M_in_beg,
 				 ios_base::cur, ios_base::in);
 	    }

 	  if (__testinit || __testget)
 	    {
 	      // Assume buffered case, need to refill internal buffers.
 	      streamsize __size = _M_file->xsgetn(_M_in_beg, _M_buf_size);
 	      if (0 < __size)
 		{
 		  _M_set_determinate(__size);
 		  if (__testout)
 		    _M_out_cur = _M_in_cur;
 		  __ret = traits_type::to_int_type(*_M_in_cur);
 #if _GLIBCPP_AVOID_FSEEK
 		  if (__size == 1)
 		    _M_file->sys_ungetc(*_M_in_cur);
 		  else
 		    {
 #endif
 		  streamoff __p = _M_file->seekoff(0 - __size, ios_base::cur,
 						   ios_base::in);
 		  if (__p == -1)
 		    {
 		      // XXX Something is wrong, do error checking.
 		    }
 #if _GLIBCPP_AVOID_FSEEK
 		    }
 #endif
 		}
 	    }
 	}
       _M_last_overflowed = false;
       return __ret;
     }

   template<typename _CharT, typename _Traits>
     typename basic_filebuf<_CharT, _Traits>::int_type
     basic_filebuf<_CharT, _Traits>::
     pbackfail(int_type __i)
     {
       int_type __ret = traits_type::eof();
       bool __testin = _M_mode & ios_base::in;

       if (__testin)
 	{
 	  bool __testpb = _M_in_beg < _M_in_cur;
 	  char_type __c = traits_type::to_char_type(__i);
 	  bool __testeof = traits_type::eq_int_type(__i, __ret);

 	  if (__testpb)
 	    {
 	      bool __testout = _M_mode & ios_base::out;
 	      bool __testeq = traits_type::eq(__c, this->gptr()[-1]);

 	      // Try to put back __c into input sequence in one of three ways.
 	      // Order these tests done in is unspecified by the standard.
 	      if (!__testeof && __testeq)
 		{
 		  --_M_in_cur;
 		  if (__testout)
 		    --_M_out_cur;
 		  __ret = __i;
 		}
 	      else if (__testeof)
 		{
 		  --_M_in_cur;
 		  if (__testout)
 		    --_M_out_cur;
 		  __ret = traits_type::not_eof(__i);
 		}
 	      else if (!__testeof)
 		{
 		  --_M_in_cur;
 		  if (__testout)
 		    --_M_out_cur;
 		  _M_pback_create();
 		  *_M_in_cur = __c;
 		  __ret = __i;
 		}
 	    }
 	  else
 	    {
  	      // At the beginning of the buffer, need to make a
 	      // putback position available.
 	      this->seekoff(-1, ios_base::cur);
 	      this->underflow();
  	      if (!__testeof)
  		{
 		  if (!traits_type::eq(__c, *_M_in_cur))
 		    {
 		      _M_pback_create();
 		      *_M_in_cur = __c;
 		    }
  		  __ret = __i;
  		}
  	      else
  		__ret = traits_type::not_eof(__i);
  	    }
 	}
       _M_last_overflowed = false;
       return __ret;
     }

   template<typename _CharT, typename _Traits>
     typename basic_filebuf<_CharT, _Traits>::int_type
     basic_filebuf<_CharT, _Traits>::
     overflow(int_type __c)
     {
       int_type __ret = traits_type::eof();
       bool __testput = _M_out_cur && _M_out_cur < _M_buf + _M_buf_size;
       bool __testout = _M_mode & ios_base::out;

       if (__testout)
 	{
 	  if (__testput)
 	    {
 	      *_M_out_cur = traits_type::to_char_type(__c);
 	      _M_out_cur_move(1);
 	      __ret = traits_type::not_eof(__c);
 	    }
 	  else
 	    __ret = this->_M_really_overflow(__c);
 	}

       _M_last_overflowed = false;    // Set in _M_really_overflow, below.
       return __ret;
     }

   template<typename _CharT, typename _Traits>
     typename basic_filebuf<_CharT, _Traits>::int_type
     basic_filebuf<_CharT, _Traits>::
     _M_really_overflow(int_type __c)
     {
       int_type __ret = traits_type::eof();
       bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
       bool __testunbuffered = _M_file && !_M_buf_size;

       if (__testput || __testunbuffered)
 	{
 #if 1
 	  int __plen = _M_out_end - _M_out_beg;
 	  streamsize __len = 0;

 	  if (__plen)
 	    __len = _M_file->xsputn(_M_out_beg, __plen);

 	  if (__c !=traits_type::eof())
 	    {
  	      char_type __pending = traits_type::to_char_type(__c);
  	      __len += _M_file->xsputn(&__pending, 1);
   	      ++__plen;
 	    }

 	  // NB: Need this so that external byte sequence reflects
 	  // internal buffer.
 	  _M_file->sync();
 	  if (__len == __plen)
 	    {
 	      _M_set_indeterminate();
 	      __ret = traits_type::not_eof(__c);
 	    }
 #else
 	  // Part one: Allocate temporary conversion buffer on
 	  // stack. Convert internal buffer plus __c (ie,
 	  // "pending sequence") to temporary conversion buffer.
 	  int __plen = _M_out_end - _M_out_beg;
 	  char_type* __pbuf = static_cast<char_type*>(__builtin_alloca(sizeof(char_type) * __plen + 1));
 	  traits_type::copy(__pbuf, this->pbase(), __plen);
 	  if (!__testeof)
 	    {
 	      __pbuf[__plen] = traits_type::to_char_type(__c);
 	      ++__plen;
 	    }

 	  char_type* __pend;
 	  char* __conv_buf = static_cast<char*>(__builtin_alloca(__plen));
 	  char* __conv_end;
 	  _M_state_beg = _M_state_cur;

 	  __res_type __r = _M_fcvt->out(_M_state_cur,
 					__pbuf, __pbuf + __plen,
 					const_cast<const char_type*&>(__pend),
 					__conv_buf, __conv_buf + __plen,
 					__conv_end);

 	  // Part two: (Re)spill converted "pending sequence"
 	  // contents (now in temporary conversion buffer) to
 	  // external buffer (_M_file->_IO_*) using
 	  // _M_file->sys_write(), and do error (minimal) checking.
 	  if (__r != codecvt_base::error)
 	    {
 	      streamsize __len = _M_file->xsputn(__conv_buf, __plen);
 	      // NB: Need this so that external byte sequence reflects
 	      // internal buffer.
 	      _M_file->sync();
 	      if (__len == __plen)
 		{
 		  _M_set_indeterminate();
 		  __ret = traits_type::not_eof(__c);
 		}
 	    }
 #endif
 	}
       _M_last_overflowed = true;
       return __ret;
     }

   template<typename _CharT, typename _Traits>
     typename basic_filebuf<_CharT, _Traits>::__streambuf_type*
     basic_filebuf<_CharT, _Traits>::
     setbuf(char_type* __s, streamsize __n)
     {
       if (!this->is_open() && __s == 0 && __n == 0)
 	_M_buf_size_opt = 0;
       else if (__s && __n)
 	{
 	  // This is implementation-defined behavior, and assumes
 	  // that an external char_type array of length (__s + __n)
 	  // exists and has been pre-allocated. If this is not the
 	  // case, things will quickly blow up.
 	  // Step 1: Destroy the current internal array.
 	  _M_destroy_internal_buffer();

 	  // Step 2: Use the external array.
 	  _M_buf = __s;
 	  _M_buf_size_opt = _M_buf_size = __n;
 	  _M_set_indeterminate();

 	// Step 3: Make sure a pback buffer is allocated.
 	  _M_allocate_pback_buffer();
 	}
       _M_last_overflowed = false;
       return this;
     }

   template<typename _CharT, typename _Traits>
     typename basic_filebuf<_CharT, _Traits>::pos_type
     basic_filebuf<_CharT, _Traits>::
     seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
     {
       pos_type __ret =  pos_type(off_type(-1));
       bool __testopen = this->is_open();
       bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
       bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;

       // Should probably do has_facet checks here.
       int __width = use_facet<__codecvt_type>(_M_buf_locale).encoding();
       if (__width < 0)
 	__width = 0;
       bool __testfail = __off != 0  && __width <= 0;

       if (__testopen && !__testfail && (__testin || __testout))
 	{
 	  // Ditch any pback buffers to avoid confusion.
 	  _M_pback_destroy();

 	  if (__way != ios_base::cur || __off != 0)
 	    {
 	      off_type __computed_off = __width * __off;

 	      bool __testget = _M_in_cur && _M_in_beg < _M_in_end;
 	      bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
 	      // Sync the internal and external streams.
 	      // out
 	      if (__testput || _M_last_overflowed)
 		{
 		  // Part one: update the output sequence.
 		  this->sync();
 		  // Part two: output unshift sequence.
 		  _M_output_unshift();
 		}
 	      //in
 	      // NB: underflow() rewinds the external buffer.
 	      else if (__testget && __way == ios_base::cur)
 		__computed_off += _M_in_cur - _M_in_beg;

 	      __ret = _M_file->seekoff(__computed_off, __way, __mode);
 	      _M_set_indeterminate();
 	    }
 	  // NB: Need to do this in case _M_file in indeterminate
 	  // state, ie _M_file->_offset == -1
 	  else
 	    {
 	      __ret = _M_file->seekoff(__off, ios_base::cur, __mode);
 	      __ret += max(_M_out_cur, _M_in_cur) - _M_buf;
 	    }
 	}
       _M_last_overflowed = false;
       return __ret;
     }

   template<typename _CharT, typename _Traits>
     typename basic_filebuf<_CharT, _Traits>::pos_type
     basic_filebuf<_CharT, _Traits>::
     seekpos(pos_type __pos, ios_base::openmode __mode)
     {
       pos_type __ret;
       off_type __off = __pos;

       __ret = this->seekoff(__off, ios_base::beg, __mode);

       _M_last_overflowed = false;
       return __ret;
     }

   template<typename _CharT, typename _Traits>
     void
     basic_filebuf<_CharT, _Traits>::
     _M_output_unshift()
     { }

   template<typename _CharT, typename _Traits>
     void
     basic_filebuf<_CharT, _Traits>::
     imbue(const locale& __loc)
     {
       bool __testbeg = gptr() == eback() && pptr() == pbase();

       if (__testbeg && _M_buf_locale != __loc)
 	{
 	  _M_buf_locale = __loc;
 	  _M_buf_locale_init = true;
 	}

       // NB this may require the reconversion of previously
       // converted chars. This in turn may cause the reconstruction
       // of the original file. YIKES!!
       // XXX The part in the above comment is not done.
       _M_last_overflowed = false;
     }

 } // namespace std

 #endif // _CPP_BITS_FSTREAM_TCC
	// File based streams -- C++ --

	// Copyright (C) 1997, 1998, 1999, 2000, 2001 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.

	//
	// ISO C++ 14882: 27.8 File-based streams
	//

	#ifndef _CPP_BITS_FSTREAM_TCC
	#define _CPP_BITS_FSTREAM_TCC 1

	namespace std
	{
	template<typename _CharT, typename _Traits>
	void
	basic_filebuf<_CharT, _Traits>::
	_M_allocate_file()
	{
	if (!_M_file)
	{
	_M_buf_unified = true; // Tie input to output for basic_filebuf.
	try
	{ _M_file = new __file_type(&_M_lock); }
	catch(...)
	{
	delete _M_file;
	__throw_exception_again;
	}
	}
	}

	template<typename _CharT, typename _Traits>
	void
	basic_filebuf<_CharT, _Traits>::
	_M_allocate_internal_buffer()
	{
	if (!_M_buf && _M_buf_size_opt)
	{
	_M_buf_size = _M_buf_size_opt;

	// Allocate internal buffer.
	try { _M_buf = new char_type[_M_buf_size]; }
	catch(...)
	{
	delete [] _M_buf;
	__throw_exception_again;
	}
	_M_buf_allocated = true;
	}
	}

	// Both close and setbuf need to deallocate internal buffers, if it exists.
	template<typename _CharT, typename _Traits>
	void
	basic_filebuf<_CharT, _Traits>::
	_M_destroy_internal_buffer()
	{
	if (_M_buf_allocated)
	{
	delete [] _M_buf;
	_M_buf = NULL;
	_M_buf_allocated = false;
	this->setg(NULL, NULL, NULL);
	this->setp(NULL, NULL);
	}
	}

	template<typename _CharT, typename _Traits>
	void
	basic_filebuf<_CharT, _Traits>::
	_M_allocate_pback_buffer()
	{
	if (!_M_pback && _M_pback_size)
	{
	// Allocate pback buffer.
	try
	{ _M_pback = new char_type[_M_pback_size]; }
	catch(...)
	{
	delete [] _M_pback;
	__throw_exception_again;
	}
	}
	}

	template<typename _CharT, typename _Traits>
	basic_filebuf<_CharT, _Traits>::
	basic_filebuf()
	: __streambuf_type(), _M_file(NULL), _M_state_cur(__state_type()),
	_M_state_beg(__state_type()), _M_buf_allocated(false),
	_M_last_overflowed(false)
	{ }

	template<typename _CharT, typename _Traits>
	basic_filebuf<_CharT, _Traits>::
	basic_filebuf(__c_file_type* __f, ios_base::openmode __mode, int_type __s)
	: __streambuf_type(), _M_file(NULL), _M_state_cur(__state_type()),
	_M_state_beg(__state_type()), _M_buf_allocated(false),
	_M_last_overflowed(false)
	{
	_M_allocate_file();
	_M_file->sys_open(__f, __mode);
	if (this->is_open())
	{
	_M_mode = __mode;
	if (__s)
	{
	_M_buf_size_opt = __s;
	_M_allocate_internal_buffer();
	_M_set_indeterminate();
	}
	_M_allocate_pback_buffer();
	}
	}

	template<typename _CharT, typename _Traits>
	int
	basic_filebuf<_CharT, _Traits>::
	fd()
	{
	return _M_file->fd();
	}

	template<typename _CharT, typename _Traits>
	typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
	basic_filebuf<_CharT, _Traits>::
	open(const char* __s, ios_base::openmode __mode)
	{
	__filebuf_type *__ret = NULL;
	if (!this->is_open())
	{
	_M_allocate_file();
	_M_file->open(__s, __mode);
	if (this->is_open())
	{
	_M_allocate_internal_buffer();
	_M_allocate_pback_buffer();
	_M_mode = __mode;

	// For time being, set both (in/out) sets of pointers.
	_M_set_indeterminate();
	if (__mode & ios_base::ate
	&& this->seekoff(0, ios_base::end, __mode) < 0)
	this->close();
	__ret = this;
	}
	}
	return __ret;
	}

	template<typename _CharT, typename _Traits>
	typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
	basic_filebuf<_CharT, _Traits>::
	close()
	{
	__filebuf_type *__ret = NULL;
	if (this->is_open())
	{
	bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
	if (__testput)
	_M_really_overflow(traits_type::eof());

	// NB: Do this here so that re-opened filebufs will be cool...
	_M_pback_destroy();

	#if 0
	// XXX not done
	if (_M_last_overflowed)
	{
	_M_output_unshift();
	_M_really_overflow(traits_type::eof());
	}
	#endif

	_M_mode = ios_base::openmode(0);
	_M_destroy_internal_buffer();

	if (_M_pback)
	{
	delete [] _M_pback;
	_M_pback = NULL;
	}
	__ret = this;
	}

	// Can actually allocate this file as part of an open and never
	// have it be opened.....
	if (_M_file)
	{
	delete _M_file;
	_M_file = NULL;
	}
	_M_last_overflowed = false;
	return __ret;
	}

	template<typename _CharT, typename _Traits>
	streamsize
	basic_filebuf<_CharT, _Traits>::
	showmanyc()
	{
	streamsize __ret = -1;
	bool __testin = _M_mode & ios_base::in;

	if (__testin)
	{
	if (_M_in_cur < _M_in_end)
	__ret = _M_in_end - _M_in_cur;
	else
	__ret = 0;
	}
	_M_last_overflowed = false;
	return __ret;
	}

	template<typename _CharT, typename _Traits>
	typename basic_filebuf<_CharT, _Traits>::int_type
	basic_filebuf<_CharT, _Traits>::
	underflow()
	{
	int_type __ret = traits_type::eof();
	bool __testin = _M_mode & ios_base::in;
	bool __testout = _M_mode & ios_base::out;

	// XXX Should re-enable codecvt bits disabled after 2.90.8.
	if (__testin)
	{
	// Check for pback madness, and if so swich back to the
	// normal buffers and jet outta here before expensive
	// fileops happen...
	if (_M_pback_init)
	{
	_M_pback_destroy();
	if (_M_in_cur < _M_in_end)
	return traits_type::to_int_type(*_M_in_cur);
	}

	bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
	bool __testinit = _M_is_indeterminate();
	// Sync internal and external buffers.
	// NB: __testget -> __testput as _M_buf_unified here.
	if (__testget)
	{
	if (__testout)
	_M_really_overflow();
	#if _GLIBCPP_AVOID_FSEEK
	else if ((_M_in_cur - _M_in_beg) == 1)
	_M_file->sys_getc();
	#endif
	else
	_M_file->seekoff(_M_in_cur - _M_in_beg,
	ios_base::cur, ios_base::in);
	}

	if (__testinit \|\| __testget)
	{
	// Assume buffered case, need to refill internal buffers.
	streamsize __size = _M_file->xsgetn(_M_in_beg, _M_buf_size);
	if (0 < __size)
	{
	_M_set_determinate(__size);
	if (__testout)
	_M_out_cur = _M_in_cur;
	__ret = traits_type::to_int_type(*_M_in_cur);
	#if _GLIBCPP_AVOID_FSEEK
	if (__size == 1)
	_M_file->sys_ungetc(*_M_in_cur);
	else
	{
	#endif
	streamoff __p = _M_file->seekoff(0 - __size, ios_base::cur,
	ios_base::in);
	if (__p == -1)
	{
	// XXX Something is wrong, do error checking.
	}
	#if _GLIBCPP_AVOID_FSEEK
	}
	#endif
	}
	}
	}
	_M_last_overflowed = false;
	return __ret;
	}

	template<typename _CharT, typename _Traits>
	typename basic_filebuf<_CharT, _Traits>::int_type
	basic_filebuf<_CharT, _Traits>::
	pbackfail(int_type __i)
	{
	int_type __ret = traits_type::eof();
	bool __testin = _M_mode & ios_base::in;

	if (__testin)
	{
	bool __testpb = _M_in_beg < _M_in_cur;
	char_type __c = traits_type::to_char_type(__i);
	bool __testeof = traits_type::eq_int_type(__i, __ret);

	if (__testpb)
	{
	bool __testout = _M_mode & ios_base::out;
	bool __testeq = traits_type::eq(__c, this->gptr()[-1]);

	// Try to put back __c into input sequence in one of three ways.
	// Order these tests done in is unspecified by the standard.
	if (!__testeof && __testeq)
	{
	--_M_in_cur;
	if (__testout)
	--_M_out_cur;
	__ret = __i;
	}
	else if (__testeof)
	{
	--_M_in_cur;
	if (__testout)
	--_M_out_cur;
	__ret = traits_type::not_eof(__i);
	}
	else if (!__testeof)
	{
	--_M_in_cur;
	if (__testout)
	--_M_out_cur;
	_M_pback_create();
	*_M_in_cur = __c;
	__ret = __i;
	}
	}
	else
	{
	// At the beginning of the buffer, need to make a
	// putback position available.
	this->seekoff(-1, ios_base::cur);
	this->underflow();
	if (!__testeof)
	{
	if (!traits_type::eq(__c, *_M_in_cur))
	{
	_M_pback_create();
	*_M_in_cur = __c;
	}
	__ret = __i;
	}
	else
	__ret = traits_type::not_eof(__i);
	}
	}
	_M_last_overflowed = false;
	return __ret;
	}

	template<typename _CharT, typename _Traits>
	typename basic_filebuf<_CharT, _Traits>::int_type
	basic_filebuf<_CharT, _Traits>::
	overflow(int_type __c)
	{
	int_type __ret = traits_type::eof();
	bool __testput = _M_out_cur && _M_out_cur < _M_buf + _M_buf_size;
	bool __testout = _M_mode & ios_base::out;

	if (__testout)
	{
	if (__testput)
	{
	*_M_out_cur = traits_type::to_char_type(__c);
	_M_out_cur_move(1);
	__ret = traits_type::not_eof(__c);
	}
	else
	__ret = this->_M_really_overflow(__c);
	}

	_M_last_overflowed = false; // Set in _M_really_overflow, below.
	return __ret;
	}

	template<typename _CharT, typename _Traits>
	typename basic_filebuf<_CharT, _Traits>::int_type
	basic_filebuf<_CharT, _Traits>::
	_M_really_overflow(int_type __c)
	{
	int_type __ret = traits_type::eof();
	bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
	bool __testunbuffered = _M_file && !_M_buf_size;

	if (__testput \|\| __testunbuffered)
	{
	#if 1
	int __plen = _M_out_end - _M_out_beg;
	streamsize __len = 0;

	if (__plen)
	__len = _M_file->xsputn(_M_out_beg, __plen);

	if (__c !=traits_type::eof())
	{
	char_type __pending = traits_type::to_char_type(__c);
	__len += _M_file->xsputn(&__pending, 1);
	++__plen;
	}

	// NB: Need this so that external byte sequence reflects
	// internal buffer.
	_M_file->sync();
	if (__len == __plen)
	{
	_M_set_indeterminate();
	__ret = traits_type::not_eof(__c);
	}
	#else
	// Part one: Allocate temporary conversion buffer on
	// stack. Convert internal buffer plus __c (ie,
	// "pending sequence") to temporary conversion buffer.
	int __plen = _M_out_end - _M_out_beg;
	char_type* __pbuf = static_cast<char_type>(__builtin_alloca(sizeof(char_type) __plen + 1));
	traits_type::copy(__pbuf, this->pbase(), __plen);
	if (!__testeof)
	{
	__pbuf[__plen] = traits_type::to_char_type(__c);
	++__plen;
	}

	char_type* __pend;
	char* __conv_buf = static_cast<char*>(__builtin_alloca(__plen));
	char* __conv_end;
	_M_state_beg = _M_state_cur;

	__res_type __r = _M_fcvt->out(_M_state_cur,
	__pbuf, __pbuf + __plen,
	const_cast<const char_type*&>(__pend),
	__conv_buf, __conv_buf + __plen,
	__conv_end);

	// Part two: (Re)spill converted "pending sequence"
	// contents (now in temporary conversion buffer) to
	// external buffer (_M_file->_IO_*) using
	// _M_file->sys_write(), and do error (minimal) checking.
	if (__r != codecvt_base::error)
	{
	streamsize __len = _M_file->xsputn(__conv_buf, __plen);
	// NB: Need this so that external byte sequence reflects
	// internal buffer.
	_M_file->sync();
	if (__len == __plen)
	{
	_M_set_indeterminate();
	__ret = traits_type::not_eof(__c);
	}
	}
	#endif
	}
	_M_last_overflowed = true;
	return __ret;
	}

	template<typename _CharT, typename _Traits>
	typename basic_filebuf<_CharT, _Traits>::__streambuf_type*
	basic_filebuf<_CharT, _Traits>::
	setbuf(char_type* __s, streamsize __n)
	{
	if (!this->is_open() && __s == 0 && __n == 0)
	_M_buf_size_opt = 0;
	else if (__s && __n)
	{
	// This is implementation-defined behavior, and assumes
	// that an external char_type array of length (__s + __n)
	// exists and has been pre-allocated. If this is not the
	// case, things will quickly blow up.
	// Step 1: Destroy the current internal array.
	_M_destroy_internal_buffer();

	// Step 2: Use the external array.
	_M_buf = __s;
	_M_buf_size_opt = _M_buf_size = __n;
	_M_set_indeterminate();

	// Step 3: Make sure a pback buffer is allocated.
	_M_allocate_pback_buffer();
	}
	_M_last_overflowed = false;
	return this;
	}

	template<typename _CharT, typename _Traits>
	typename basic_filebuf<_CharT, _Traits>::pos_type
	basic_filebuf<_CharT, _Traits>::
	seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
	{
	pos_type __ret = pos_type(off_type(-1));
	bool __testopen = this->is_open();
	bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
	bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;

	// Should probably do has_facet checks here.
	int __width = use_facet<__codecvt_type>(_M_buf_locale).encoding();
	if (__width < 0)
	__width = 0;
	bool __testfail = __off != 0 && __width <= 0;

	if (__testopen && !__testfail && (__testin \|\| __testout))
	{
	// Ditch any pback buffers to avoid confusion.
	_M_pback_destroy();

	if (__way != ios_base::cur \|\| __off != 0)
	{
	off_type __computed_off = __width * __off;

	bool __testget = _M_in_cur && _M_in_beg < _M_in_end;
	bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
	// Sync the internal and external streams.
	// out
	if (__testput \|\| _M_last_overflowed)
	{
	// Part one: update the output sequence.
	this->sync();
	// Part two: output unshift sequence.
	_M_output_unshift();
	}
	//in
	// NB: underflow() rewinds the external buffer.
	else if (__testget && __way == ios_base::cur)
	__computed_off += _M_in_cur - _M_in_beg;

	__ret = _M_file->seekoff(__computed_off, __way, __mode);
	_M_set_indeterminate();
	}
	// NB: Need to do this in case _M_file in indeterminate
	// state, ie _M_file->_offset == -1
	else
	{
	__ret = _M_file->seekoff(__off, ios_base::cur, __mode);
	__ret += max(_M_out_cur, _M_in_cur) - _M_buf;
	}
	}
	_M_last_overflowed = false;
	return __ret;
	}

	template<typename _CharT, typename _Traits>
	typename basic_filebuf<_CharT, _Traits>::pos_type
	basic_filebuf<_CharT, _Traits>::
	seekpos(pos_type __pos, ios_base::openmode __mode)
	{
	pos_type __ret;
	off_type __off = __pos;

	__ret = this->seekoff(__off, ios_base::beg, __mode);

	_M_last_overflowed = false;
	return __ret;
	}

	template<typename _CharT, typename _Traits>
	void
	basic_filebuf<_CharT, _Traits>::
	_M_output_unshift()
	{ }

	template<typename _CharT, typename _Traits>
	void
	basic_filebuf<_CharT, _Traits>::
	imbue(const locale& __loc)
	{
	bool __testbeg = gptr() == eback() && pptr() == pbase();

	if (__testbeg && _M_buf_locale != __loc)
	{
	_M_buf_locale = __loc;
	_M_buf_locale_init = true;
	}

	// NB this may require the reconversion of previously
	// converted chars. This in turn may cause the reconstruction
	// of the original file. YIKES!!
	// XXX The part in the above comment is not done.
	_M_last_overflowed = false;
	}

	} // namespace std

	#endif // _CPP_BITS_FSTREAM_TCC