[gcc.git] / libstdc++-v3 / bits / fstream.tcc

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

// Copyright (C) 1997-1999, 2000 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_init_filebuf(void)
    {
      _M_buf_unified = true; // Tie input to output for basic_filebuf.
      _M_buf_size = _M_buf_size_opt;
      try {
	_M_file = new __file_type(&_M_lock);
      }
      catch(...) {
	delete _M_file;
	throw;
      }
    }

  template<typename _CharT, typename _Traits>
    basic_filebuf<_CharT, _Traits>::
    basic_filebuf() 
    : __streambuf_type(), _M_file(NULL), _M_state_cur(), _M_state_beg(), 
    _M_last_overflowed(false)
    { _M_fcvt = &use_facet<__codecvt_type>(this->getloc()); }

  template<typename _CharT, typename _Traits>
    basic_filebuf<_CharT, _Traits>::
    basic_filebuf(int __fd, const char* /*__name*/, ios_base::openmode __mode)
    : __streambuf_type(), _M_state_cur(), _M_state_beg(),
    _M_last_overflowed(false)
    {
      _M_fcvt = &use_facet<__codecvt_type>(this->getloc());
      _M_init_filebuf();
      _M_file->sys_open(__fd, __mode);
      if (this->is_open() && _M_buf_size)
	{
	  _M_mode = __mode;
	  // XXX So that istream::getc() will only need to get 1 char,
	  // as opposed to BUF_SIZE.
	  if (__fd == 0)
	    _M_buf_size = 1;

	  try {
	    _M_buf = new char_type[_M_buf_size];
	  }
	  catch(...) {
	    delete [] _M_buf;
	    throw;
	  }

	  this->_M_set_indeterminate();
	}
   }

  template<typename _CharT, typename _Traits>
    basic_filebuf<_CharT, _Traits>::__filebuf_type* 
    basic_filebuf<_CharT, _Traits>::
    open(const char* __s, ios_base::openmode __mode)
    {
      __filebuf_type *__retval = NULL;
      if (!this->is_open())
	{
	  _M_init_filebuf();
	  _M_file->open(__s, __mode);
	  if (this->is_open() && _M_buf_size)
	    {
	      _M_mode = __mode;

	      try {
		_M_buf = new char_type[_M_buf_size];
	      }
	      catch(...) {
		delete [] _M_buf;
		throw;
	      }
	      
	      // 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();
	      __retval = this;
	    }
	}
      return __retval;
    }

  template<typename _CharT, typename _Traits>
    basic_filebuf<_CharT, _Traits>::__filebuf_type* 
    basic_filebuf<_CharT, _Traits>::
    close()
    {
      __filebuf_type *__retval = NULL;
      if (this->is_open())
	{
	  bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
	  if (__testput)
	    _M_really_overflow(traits_type::eof());
	  
#if 0
	  // XXX not done
	  if (_M_last_overflowed)
	    {
	      _M_output_unshift();
	      _M_really_overflow(traits_type::eof());
	    }
#endif

	  if (_M_file)
	    {
	      delete _M_file;
	      _M_file = NULL;
	      _M_mode = ios_base::openmode(0);
	      if (_M_buf_size)
		delete [] _M_buf;
	      _M_buf = NULL;
	      this->setg(NULL, NULL, NULL);
	      this->setp(NULL, NULL);
	      __retval = this;
	    }
	}
      _M_last_overflowed = false;	
      return __retval;
    }

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

      if (__testin)
	{
	  bool __testeof = false;
	  if (_M_in_cur >= _M_in_end)
	    __testeof = this->underflow() == traits_type::eof();
	  if (!__testeof)
	    __retval = (_M_in_end - _M_in_cur) / sizeof(char_type);
	}
      _M_last_overflowed = false;	
      return __retval;
    }

  template<typename _CharT, typename _Traits>
    basic_filebuf<_CharT, _Traits>::int_type 
    basic_filebuf<_CharT, _Traits>::
    underflow()
    {
      int_type __retval = traits_type::eof();
      bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
      bool __testinit = _M_is_indeterminate();
      bool __testout = _M_mode & ios_base::out;
      bool __testin = _M_mode & ios_base::in;
      
      if (__testin)
	{
	  // Sync internal and external buffers.
	  // NB: __testget -> __testput as _M_buf_unified here.
	  if (__testget)
	    {
	      if (__testout)
		_M_really_overflow();
	      else 
		_M_file->seekoff(_M_in_cur - _M_in_beg, 
				 ios_base::cur, ios_base::in);
	    }

	  if (__testinit || __testget)
	    {
	      // Part one: (Re)fill external buf (_M_file->_IO_*) from
	      // external byte sequence (whatever physical byte sink or
	      // FILE actually is.)
	      char __conv_buf[_M_buf_size];
	      streamsize __size = _M_file->xsgetn(__conv_buf, _M_buf_size);
	      
	      // Part two: (Re)fill internal buf contents from external buf.
	      if (0 < __size)
		{
		  _M_set_determinate(__size);
		  
		  char* __conv_cur = __conv_buf;
		  _M_state_beg = _M_state_cur;
		  __res_type __r = _M_fcvt->in(_M_state_cur, 
					       __conv_buf,
					       __conv_buf + __size,
					 const_cast<const char*&>(__conv_cur), 
					      _M_in_beg, _M_in_end, _M_in_cur);
	      
		  if (__r == codecvt_base::partial)
		    {
		      // XXX Retry with larger _M_buf size.
		    }
		  
		  // Set pointers to internal and external buffers
		  // correctly. . .
		  if (__r != codecvt_base::error)
		    {
		      if (__testout)
			_M_out_cur = _M_in_cur;
		      __retval = traits_type::to_int_type(*_M_in_cur);
		    }

		  // Part three: Sync the current internal buffer
		  // position with the (now overshot) external buffer
		  // position.  
		  streamoff __p = _M_file->seekoff(0 - __size, ios_base::cur, 
						  ios_base::in);
		  if (__p == -1)
		    {
		      // XXX Something is wrong, do error checking.
		    }
		}
	    }	      
	}
      _M_last_overflowed = false;	
      return __retval;
    }
  
  template<typename _CharT, typename _Traits>
    basic_filebuf<_CharT, _Traits>::int_type 
    basic_filebuf<_CharT, _Traits>::
    pbackfail(int_type __i)
    {
      int_type __retval = traits_type::eof();
      char_type __c = traits_type::to_char_type(__i);
      bool __testeof = traits_type::eq_int_type(__i, traits_type::eof());
      bool __testout = _M_mode & ios_base::out;
      bool __testin = _M_mode & ios_base::in;

      if (__testin)
	{
	  if (!_M_is_indeterminate())	  
	    {
	      bool __testpb = _M_in_beg < _M_in_cur;
	      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 && __testpb && __testeq)
		{
		  --_M_in_cur;
		  if (__testout)
		    --_M_out_cur;
		  __retval = __i;
		}
	      else if (!__testeof && __testpb && __testout)
		{
		  --_M_in_cur;
		  if (__testout)
		    --_M_out_cur;
		  *_M_in_cur = __c;
		  __retval = __i;
		}
	      else if (__testeof && __testpb)
		{
		  --_M_in_cur;
		  if (__testout)
		    --_M_out_cur;
		  __retval = traits_type::not_eof(__i);
		}
	    }
	  else
	    {
	      // Need to make a putback position available.
	      this->seekoff(-1, ios_base::cur);
	      this->underflow();
	      if (!__testeof)
		{
		  *_M_in_cur = __c;
		  __retval = __c;
		}
	      else
		__retval = traits_type::not_eof(__i);
	    }
	}
      _M_last_overflowed = false;	
      return __retval;
    }

  template<typename _CharT, typename _Traits>
    basic_filebuf<_CharT, _Traits>::int_type 
    basic_filebuf<_CharT, _Traits>::
    overflow(int_type __c)
    {
      int_type __retval = traits_type::eof();
      bool __testpos = _M_out_cur && _M_out_cur >= _M_buf + _M_buf_size;
      bool __testout = _M_mode & ios_base::out;
      
      if (__testout)
	{
	  if (!__testpos)
	    {
	      *_M_out_cur = traits_type::to_char_type(__c);
	      _M_buf_bump(1);
	      __retval = traits_type::not_eof(__c);
	    }
	  else 
	    __retval = this->_M_really_overflow(__c);
	}

      _M_last_overflowed = false;    // Set in _M_really_overflow, below.
      return __retval;
    }
  
  template<typename _CharT, typename _Traits>
    basic_filebuf<_CharT, _Traits>::int_type 
    basic_filebuf<_CharT, _Traits>::
    _M_really_overflow(int_type __c)
    {
      int_type __retval = traits_type::eof();
      bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
      bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
      
      if (__testput)
	{
	  // 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[__plen + sizeof(char_type)];	      
	  traits_type::copy(__pbuf, this->pbase(), __plen);
	  if (!__testeof)
	    {
	      __pbuf[__plen] = traits_type::to_char_type(__c);
	      ++__plen;
	    }

	  char_type* __pend;
	  char __conv_buf[__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();
		  __retval = traits_type::not_eof(__c);
		}
	    }
	}	      
      _M_last_overflowed = true;	
      return __retval;
    }

  template<typename _CharT, typename _Traits>
    basic_filebuf<_CharT, _Traits>::pos_type
    basic_filebuf<_CharT, _Traits>::
    seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
    {
      pos_type __retval =  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;
      int __width = _M_fcvt->encoding();
      if (__width < 0)
	__width = 0;
      bool __testfail = __off != 0  && __width <= 0;
      
      if (__testopen && !__testfail && (__testin || __testout))
	{
	  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;
	  
	      __retval = _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
	    {
	      __retval = _M_file->seekoff(__off, ios_base::cur, __mode);
	      __retval += max(_M_out_cur, _M_in_cur) - _M_buf;
	    }
	}
      _M_last_overflowed = false;	
      return __retval;
    }

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

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

      _M_last_overflowed = false;	
      return __retval;
    }

  template<typename _CharT, typename _Traits>
    void 
    basic_filebuf<_CharT, _Traits>::
    _M_output_unshift()
    {
#if 0
      // XXX Not complete, or correct.
      int __width = _M_fcvt->encoding();
      
      if (__width < 0)
	{
	  // Part one: call codecvt::unshift
	  int __unsft_len = 0;
	  char_type __unsft_buf[_M_buf_size];
	    char_type* __unsft_cur; // XXX Set to external buf.
	    _M_state_beg = _M_state_cur;
	    __res_type __r = _M_fcvt->unshift(_M_state_cur, 
					      __unsft_buf,
					      __unsft_buf + _M_buf_size,
					      __unsft_cur);
	    
	    // Note, for char_type == char, wchar_t unshift
	    // should store no charachers.
	    if (__r == codecvt_base::ok || __r == codecvt_base::noconv)
	      __unsft_len = __unsft_cur - __unsft_buf;
	    
	    // "Output the resulting sequence."
	    if (__unsft_len)
	      {
		int __plen = _M_out_cur - _M_out_beg;
		int __rlen = __plen  + __unsft_len;
		char_type __rbuf[__rlen];
		char_type* __rend;
		traits_type::copy(__rbuf, this->pbase(), __plen);
		traits_type::copy(__rbuf + __plen, __unsft_buf, 
				  __unsft_len);

		char __conv_buf[__rlen];
		char* __conv_end;
		
		_M_state_beg = _M_state_cur; // XXX Needed?
		__r = _M_fcvt->out(_M_state_cur, 
				  __rbuf, __rbuf + __rlen,
				  const_cast<const char_type*&>(__rend),
				  __conv_buf, 
				  __conv_buf + __rlen,
				  __conv_end);
		
		if (__r != codecvt_base::error)
		  {
		    streamsize __r = _M_file->xsputn(__conv_buf, __rlen);
		    if (__r == __rlen)
		      {
			_M_out_cur = _M_out_beg;
			if (_M_mode & ios_base::in)
			  _M_in_cur = _M_out_cur;
		      }
		    else
		      {
			// XXX Throw "wig out and die exception?"
		      }
		  }
	      }
	  }
#endif
    }

  template<typename _CharT, typename _Traits>
    void
    basic_filebuf<_CharT, _Traits>::
    imbue(const locale& __loc)
    {
      bool __testbeg = gptr() == eback() && pptr() == pbase();
      bool __teststate = _M_fcvt->encoding() == -1;
      
      _M_locale_set = true;
      if (__testbeg && !__teststate && _M_locale_buf != __loc)
	{
	  // XXX Will need to save these older values.
	  _M_locale_buf = __loc;
	  _M_fcvt = &use_facet<__codecvt_type>(_M_locale_buf);
	  // XXX Necessary?
	  _M_fctype_buf = &use_facet<__ctype_type>(_M_locale_buf); 
	}
      // 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
Commit	Line	Data
b2dad0e3 BK	1	// File based streams -- C++ --
b2dad0e3 BK	2
d207c3f7	3	// Copyright (C) 1997-1999, 2000 Free Software Foundation, Inc.
b2dad0e3 BK	4	//
	5	// This file is part of the GNU ISO C++ Library. This library is free
	6	// software; you can redistribute it and/or modify it under the
	7	// terms of the GNU General Public License as published by the
	8	// Free Software Foundation; either version 2, or (at your option)
	9	// any later version.
	10
	11	// This library is distributed in the hope that it will be useful,
	12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	// GNU General Public License for more details.
	15
	16	// You should have received a copy of the GNU General Public License along
	17	// with this library; see the file COPYING. If not, write to the Free
	18	// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
	19	// USA.
	20
	21	// As a special exception, you may use this file as part of a free software
	22	// library without restriction. Specifically, if other files instantiate
	23	// templates or use macros or inline functions from this file, or you compile
	24	// this file and link it with other files to produce an executable, this
	25	// file does not by itself cause the resulting executable to be covered by
	26	// the GNU General Public License. This exception does not however
	27	// invalidate any other reasons why the executable file might be covered by
	28	// the GNU General Public License.
	29
	30	//
	31	// ISO C++ 14882: 27.8 File-based streams
	32	//
	33
	34	#ifndef _CPP_BITS_FSTREAM_TCC
	35	#define _CPP_BITS_FSTREAM_TCC 1
	36
	37	namespace std
	38	{
	39	template<typename _CharT, typename _Traits>
	40	void
	41	basic_filebuf<_CharT, _Traits>::
	42	_M_init_filebuf(void)
	43	{
	44	_M_buf_unified = true; // Tie input to output for basic_filebuf.
d207c3f7	45	_M_buf_size = _M_buf_size_opt;
b2dad0e3 BK	46	try {
	47	_M_file = new __file_type(&_M_lock);
	48	}
	49	catch(...) {
	50	delete _M_file;
	51	throw;
	52	}
	53	}
	54
	55	template<typename _CharT, typename _Traits>
	56	basic_filebuf<_CharT, _Traits>::
	57	basic_filebuf()
81ef1479	58	: __streambuf_type(), _M_file(NULL), _M_state_cur(), _M_state_beg(),
ab30ba5c	59	_M_last_overflowed(false)
b2dad0e3 BK	60	{ _M_fcvt = &use_facet<__codecvt_type>(this->getloc()); }
b2dad0e3 BK	61
b2dad0e3 BK	62	template<typename _CharT, typename _Traits>
	63	basic_filebuf<_CharT, _Traits>::
	64	basic_filebuf(int __fd, const char* /__name/, ios_base::openmode __mode)
81ef1479 BK	65	: __streambuf_type(), _M_state_cur(), _M_state_beg(),
81ef1479 BK	66	_M_last_overflowed(false)
b2dad0e3 BK	67	{
	68	_M_fcvt = &use_facet<__codecvt_type>(this->getloc());
	69	_M_init_filebuf();
	70	_M_file->sys_open(__fd, __mode);
	71	if (this->is_open() && _M_buf_size)
	72	{
	73	_M_mode = __mode;
	74	// XXX So that istream::getc() will only need to get 1 char,
	75	// as opposed to BUF_SIZE.
	76	if (__fd == 0)
	77	_M_buf_size = 1;
	78
	79	try {
	80	_M_buf = new char_type[_M_buf_size];
	81	}
	82	catch(...) {
	83	delete [] _M_buf;
	84	throw;
	85	}
	86
	87	this->_M_set_indeterminate();
	88	}
	89	}
	90
	91	template<typename _CharT, typename _Traits>
	92	basic_filebuf<_CharT, _Traits>::__filebuf_type*
	93	basic_filebuf<_CharT, _Traits>::
	94	open(const char* __s, ios_base::openmode __mode)
	95	{
	96	__filebuf_type *__retval = NULL;
	97	if (!this->is_open())
	98	{
	99	_M_init_filebuf();
	100	_M_file->open(__s, __mode);
	101	if (this->is_open() && _M_buf_size)
	102	{
	103	_M_mode = __mode;
	104
	105	try {
	106	_M_buf = new char_type[_M_buf_size];
	107	}
	108	catch(...) {
	109	delete [] _M_buf;
	110	throw;
	111	}
	112
	113	// For time being, set both (in/out) sets of pointers.
	114	_M_set_indeterminate();
	115	if (__mode & ios_base::ate
	116	&& this->seekoff(0, ios_base::end, __mode) < 0)
	117	this->close();
	118	__retval = this;
	119	}
	120	}
	121	return __retval;
	122	}
	123
	124	template<typename _CharT, typename _Traits>
	125	basic_filebuf<_CharT, _Traits>::__filebuf_type*
	126	basic_filebuf<_CharT, _Traits>::
	127	close()
	128	{
	129	__filebuf_type *__retval = NULL;
	130	if (this->is_open())
131	{
132	bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
133	if (__testput)
134	_M_really_overflow(traits_type::eof());
135
136	#if 0
137	// XXX not done
138	if (_M_last_overflowed)
139	{
140	_M_output_unshift();
141	_M_really_overflow(traits_type::eof());
142	}
143	#endif
81ef1479	144
ab30ba5c	145	if (_M_file)
b2dad0e3	146	{
ab30ba5c BK	147	delete _M_file;
ab30ba5c BK	148	_M_file = NULL;
b2dad0e3 BK	149	_M_mode = ios_base::openmode(0);
	150	if (_M_buf_size)
	151	delete [] _M_buf;
	152	_M_buf = NULL;
	153	this->setg(NULL, NULL, NULL);
	154	this->setp(NULL, NULL);
	155	__retval = this;
	156	}
	157	}
	158	_M_last_overflowed = false;
	159	return __retval;
	160	}
	161
	162	template<typename _CharT, typename _Traits>
	163	streamsize
	164	basic_filebuf<_CharT, _Traits>::
	165	showmanyc()
	166	{
	167	streamsize __retval = -1;
	168	bool __testin = _M_mode & ios_base::in;
	169
	170	if (__testin)
	171	{
	172	bool __testeof = false;
	173	if (_M_in_cur >= _M_in_end)
	174	__testeof = this->underflow() == traits_type::eof();
	175	if (!__testeof)
	176	__retval = (_M_in_end - _M_in_cur) / sizeof(char_type);
	177	}
	178	_M_last_overflowed = false;
	179	return __retval;
	180	}
	181
	182	template<typename _CharT, typename _Traits>
	183	basic_filebuf<_CharT, _Traits>::int_type
	184	basic_filebuf<_CharT, _Traits>::
	185	underflow()
	186	{
	187	int_type __retval = traits_type::eof();
	188	bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
	189	bool __testinit = _M_is_indeterminate();
	190	bool __testout = _M_mode & ios_base::out;
	191	bool __testin = _M_mode & ios_base::in;
	192
	193	if (__testin)
	194	{
	195	// Sync internal and external buffers.
	196	// NB: __testget -> __testput as _M_buf_unified here.
	197	if (__testget)
	198	{
	199	if (__testout)
	200	_M_really_overflow();
	201	else
f3b004d8 BK	202	_M_file->seekoff(_M_in_cur - _M_in_beg,
f3b004d8 BK	203	ios_base::cur, ios_base::in);
b2dad0e3 BK	204	}
	205
	206	if (__testinit \|\| __testget)
	207	{
	208	// Part one: (Re)fill external buf (_M_file->_IO_*) from
	209	// external byte sequence (whatever physical byte sink or
	210	// FILE actually is.)
	211	char __conv_buf[_M_buf_size];
f3b004d8	212	streamsize __size = _M_file->xsgetn(__conv_buf, _M_buf_size);
b2dad0e3 BK	213
	214	// Part two: (Re)fill internal buf contents from external buf.
	215	if (0 < __size)
	216	{
	217	_M_set_determinate(__size);
	218
	219	char* __conv_cur = __conv_buf;
	220	_M_state_beg = _M_state_cur;
	221	__res_type __r = _M_fcvt->in(_M_state_cur,
	222	__conv_buf,
	223	__conv_buf + __size,
	224	const_cast<const char*&>(__conv_cur),
	225	_M_in_beg, _M_in_end, _M_in_cur);
	226
	227	if (__r == codecvt_base::partial)
	228	{
	229	// XXX Retry with larger _M_buf size.
	230	}
	231
	232	// Set pointers to internal and external buffers
	233	// correctly. . .
	234	if (__r != codecvt_base::error)
	235	{
	236	if (__testout)
	237	_M_out_cur = _M_in_cur;
	238	__retval = traits_type::to_int_type(*_M_in_cur);
	239	}
	240
	241	// Part three: Sync the current internal buffer
	242	// position with the (now overshot) external buffer
	243	// position.
f3b004d8	244	streamoff __p = _M_file->seekoff(0 - __size, ios_base::cur,
b2dad0e3	245	ios_base::in);
f3b004d8	246	if (__p == -1)
b2dad0e3 BK	247	{
	248	// XXX Something is wrong, do error checking.
	249	}
	250	}
	251	}
	252	}
	253	_M_last_overflowed = false;
	254	return __retval;
	255	}
	256
	257	template<typename _CharT, typename _Traits>
	258	basic_filebuf<_CharT, _Traits>::int_type
	259	basic_filebuf<_CharT, _Traits>::
	260	pbackfail(int_type __i)
	261	{
	262	int_type __retval = traits_type::eof();
	263	char_type __c = traits_type::to_char_type(__i);
	264	bool __testeof = traits_type::eq_int_type(__i, traits_type::eof());
	265	bool __testout = _M_mode & ios_base::out;
	266	bool __testin = _M_mode & ios_base::in;
	267
	268	if (__testin)
	269	{
	270	if (!_M_is_indeterminate())
	271	{
	272	bool __testpb = _M_in_beg < _M_in_cur;
	273	bool __testeq = traits_type::eq(__c, this->gptr()[-1]);
	274
	275	// Try to put back __c into input sequence in one of three ways.
	276	// Order these tests done in is unspecified by the standard.
	277	if (!__testeof && __testpb && __testeq)
	278	{
	279	--_M_in_cur;
	280	if (__testout)
	281	--_M_out_cur;
	282	__retval = __i;
	283	}
	284	else if (!__testeof && __testpb && __testout)
	285	{
	286	--_M_in_cur;
	287	if (__testout)
	288	--_M_out_cur;
	289	*_M_in_cur = __c;
	290	__retval = __i;
	291	}
	292	else if (__testeof && __testpb)
	293	{
	294	--_M_in_cur;
	295	if (__testout)
	296	--_M_out_cur;
	297	__retval = traits_type::not_eof(__i);
	298	}
	299	}
	300	else
	301	{
	302	// Need to make a putback position available.
	303	this->seekoff(-1, ios_base::cur);
	304	this->underflow();
	305	if (!__testeof)
	306	{
	307	*_M_in_cur = __c;
	308	__retval = __c;
	309	}
	310	else
311	__retval = traits_type::not_eof(__i);
312	}
313	}
314	_M_last_overflowed = false;
315	return __retval;
316	}
317
318	template<typename _CharT, typename _Traits>
319	basic_filebuf<_CharT, _Traits>::int_type
320	basic_filebuf<_CharT, _Traits>::
321	overflow(int_type __c)
322	{
323	int_type __retval = traits_type::eof();
324	bool __testpos = _M_out_cur && _M_out_cur >= _M_buf + _M_buf_size;
325	bool __testout = _M_mode & ios_base::out;
326
327	if (__testout)
328	{
329	if (!__testpos)
330	{
331	*_M_out_cur = traits_type::to_char_type(__c);
332	_M_buf_bump(1);
333	__retval = traits_type::not_eof(__c);
334	}
335	else
336	__retval = this->_M_really_overflow(__c);
337	}
338
339	_M_last_overflowed = false; // Set in _M_really_overflow, below.
340	return __retval;
341	}
342
343	template<typename _CharT, typename _Traits>
344	basic_filebuf<_CharT, _Traits>::int_type
345	basic_filebuf<_CharT, _Traits>::
346	_M_really_overflow(int_type __c)
347	{
348	int_type __retval = traits_type::eof();
349	bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
350	bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
351
352	if (__testput)
353	{
354	// Part one: Allocate temporary conversion buffer on
355	// stack. Convert internal buffer plus __c (ie,
356	// "pending sequence") to temporary conversion buffer.
357	int __plen = _M_out_end - _M_out_beg;
358	char_type __pbuf[__plen + sizeof(char_type)];
359	traits_type::copy(__pbuf, this->pbase(), __plen);
360	if (!__testeof)
361	{
362	__pbuf[__plen] = traits_type::to_char_type(__c);
363	++__plen;
364	}
365
366	char_type* __pend;
367	char __conv_buf[__plen];
368	char* __conv_end;
369	_M_state_beg = _M_state_cur;
370
371	__res_type __r = _M_fcvt->out(_M_state_cur,
372	__pbuf, __pbuf + __plen,
373	const_cast<const char_type*&>(__pend),
374	__conv_buf, __conv_buf + __plen,
375	__conv_end);
376
377	// Part two: (Re)spill converted "pending sequence"
378	// contents (now in temporary conversion buffer) to
379	// external buffer (_M_file->_IO_*) using
380	// _M_file->sys_write(), and do error (minimal) checking.
381	if (__r != codecvt_base::error)
382	{
f3b004d8	383	streamsize __len = _M_file->xsputn(__conv_buf, __plen);
b2dad0e3 BK	384	// NB: Need this so that external byte sequence reflects
	385	// internal buffer.
	386	_M_file->sync();
f3b004d8	387	if (__len == __plen)
b2dad0e3 BK	388	{
	389	_M_set_indeterminate();
	390	__retval = traits_type::not_eof(__c);
	391	}
	392	}
	393	}
	394	_M_last_overflowed = true;
	395	return __retval;
	396	}
	397
	398	template<typename _CharT, typename _Traits>
	399	basic_filebuf<_CharT, _Traits>::pos_type
	400	basic_filebuf<_CharT, _Traits>::
	401	seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
	402	{
	403	pos_type __retval = pos_type(off_type(-1));
	404	bool __testopen = this->is_open();
	405	bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
	406	bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;
	407	int __width = _M_fcvt->encoding();
	408	if (__width < 0)
	409	__width = 0;
	410	bool __testfail = __off != 0 && __width <= 0;
	411
	412	if (__testopen && !__testfail && (__testin \|\| __testout))
	413	{
	414	if (__way != ios_base::cur \|\| __off != 0)
	415	{
	416	off_type __computed_off = __width * __off;
	417
	418	bool __testget = _M_in_cur && _M_in_beg < _M_in_end;
	419	bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
	420	// Sync the internal and external streams.
	421	// out
	422	if (__testput \|\| _M_last_overflowed)
	423	{
	424	// Part one: update the output sequence.
	425	this->sync();
	426	// Part two: output unshift sequence.
	427	_M_output_unshift();
	428	}
	429	//in
	430	// NB: underflow() rewinds the external buffer.
	431	else if (__testget && __way == ios_base::cur)
	432	__computed_off += _M_in_cur - _M_in_beg;
	433
	434	__retval = _M_file->seekoff(__computed_off, __way, __mode);
b2dad0e3 BK	435	_M_set_indeterminate();
	436	}
	437	// NB: Need to do this in case _M_file in indeterminate
	438	// state, ie _M_file->_offset == -1
	439	else
	440	{
	441	__retval = _M_file->seekoff(__off, ios_base::cur, __mode);
	442	__retval += max(_M_out_cur, _M_in_cur) - _M_buf;
	443	}
	444	}
	445	_M_last_overflowed = false;
	446	return __retval;
	447	}
	448
	449	template<typename _CharT, typename _Traits>
	450	basic_filebuf<_CharT, _Traits>::pos_type
	451	basic_filebuf<_CharT, _Traits>::
	452	seekpos(pos_type __pos, ios_base::openmode __mode)
	453	{
	454	pos_type __retval;
	455	off_type __off = __pos;
	456
	457	__retval = this->seekoff(__off, ios_base::beg, __mode);
	458
	459	_M_last_overflowed = false;
	460	return __retval;
	461	}
	462
	463	template<typename _CharT, typename _Traits>
	464	void
	465	basic_filebuf<_CharT, _Traits>::
	466	_M_output_unshift()
	467	{
	468	#if 0
	469	// XXX Not complete, or correct.
	470	int __width = _M_fcvt->encoding();
	471
	472	if (__width < 0)
	473	{
	474	// Part one: call codecvt::unshift
	475	int __unsft_len = 0;
	476	char_type __unsft_buf[_M_buf_size];
	477	char_type* __unsft_cur; // XXX Set to external buf.
	478	_M_state_beg = _M_state_cur;
	479	__res_type __r = _M_fcvt->unshift(_M_state_cur,
	480	__unsft_buf,
	481	__unsft_buf + _M_buf_size,
	482	__unsft_cur);
	483
	484	// Note, for char_type == char, wchar_t unshift
	485	// should store no charachers.
	486	if (__r == codecvt_base::ok \|\| __r == codecvt_base::noconv)
	487	__unsft_len = __unsft_cur - __unsft_buf;
	488
	489	// "Output the resulting sequence."
	490	if (__unsft_len)
	491	{
	492	int __plen = _M_out_cur - _M_out_beg;
	493	int __rlen = __plen + __unsft_len;
	494	char_type __rbuf[__rlen];
	495	char_type* __rend;
	496	traits_type::copy(__rbuf, this->pbase(), __plen);
	497	traits_type::copy(__rbuf + __plen, __unsft_buf,
	498	__unsft_len);
499
500	char __conv_buf[__rlen];
501	char* __conv_end;
502
503	_M_state_beg = _M_state_cur; // XXX Needed?
504	__r = _M_fcvt->out(_M_state_cur,
505	__rbuf, __rbuf + __rlen,
506	const_cast<const char_type*&>(__rend),
507	__conv_buf,
508	__conv_buf + __rlen,
509	__conv_end);
510
511	if (__r != codecvt_base::error)
512	{
f3b004d8	513	streamsize __r = _M_file->xsputn(__conv_buf, __rlen);
b2dad0e3 BK	514	if (__r == __rlen)
	515	{
	516	_M_out_cur = _M_out_beg;
	517	if (_M_mode & ios_base::in)
	518	_M_in_cur = _M_out_cur;
	519	}
	520	else
	521	{
	522	// XXX Throw "wig out and die exception?"
	523	}
	524	}
	525	}
	526	}
	527	#endif
	528	}
	529
	530	template<typename _CharT, typename _Traits>
	531	void
	532	basic_filebuf<_CharT, _Traits>::
	533	imbue(const locale& __loc)
	534	{
	535	bool __testbeg = gptr() == eback() && pptr() == pbase();
	536	bool __teststate = _M_fcvt->encoding() == -1;
	537
	538	_M_locale_set = true;
	539	if (__testbeg && !__teststate && _M_locale_buf != __loc)
	540	{
	541	// XXX Will need to save these older values.
	542	_M_locale_buf = __loc;
	543	_M_fcvt = &use_facet<__codecvt_type>(_M_locale_buf);
	544	// XXX Necessary?
	545	_M_fctype_buf = &use_facet<__ctype_type>(_M_locale_buf);
	546	}
	547	// NB this may require the reconversion of previously
	548	// converted chars. This in turn may cause the reconstruction
	549	// of the original file. YIKES!!
	550	// XXX The part in the above comment is not done.
	551	_M_last_overflowed = false;
	552	}
	553
	554	} // namespace std
	555
	556	#endif // _CPP_BITS_FSTREAM_TCC
	557
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