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// String based streams -*- C++ -*-

// Copyright (C) 1997-1999, 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: 27.7  String-based streams

//

#ifndef _CPP_BITS_SSTREAM_TCC

#define _CPP_BITS_SSTREAM_TCC	1

#include 

namespace std

{

  template 

    basic_stringbuf<_CharT, _Traits, _Alloc>::int_type

    basic_stringbuf<_CharT, _Traits, _Alloc>::

    pbackfail(int_type __c)

    {

      int_type __ret = traits_type::eof();

      bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());

      bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur;

      // Try to put back __c into input sequence in one of three ways.

      // Order these tests done in is unspecified by the standard.

      if (__testpos)

	{

	  if (traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])

	      && !__testeof)

	    {

	      --_M_in_cur;

	      __ret = __c;

	    }

	  else if (!__testeof)

	    {

	      --_M_in_cur;

	      *_M_in_cur = traits_type::to_char_type(__c);

	      __ret = __c;

	    }

	  else if (__testeof)

	    {

	      --_M_in_cur;

	      __ret = traits_type::not_eof(__c);

	    }

	}

      return __ret;

    }

  template 

    basic_stringbuf<_CharT, _Traits, _Alloc>::int_type

    basic_stringbuf<_CharT, _Traits, _Alloc>::

    overflow(int_type __c)

    {

      int_type __ret = traits_type::eof();

      bool __testeof = traits_type::eq_int_type(__c, __ret);

      bool __testwrite = _M_out_cur < _M_buf + _M_buf_size;

      bool __testout = _M_mode & ios_base::out;

      // Try to append __c into output sequence in one of two ways.

      // Order these tests done in is unspecified by the standard.

      if (__testout)

	{

	  if (!__testeof)

	    {

	      __size_type __len = max(_M_buf_size, _M_buf_size_opt);

	      __len *= 2;

	      if (__testwrite)

		__ret = this->sputc(__c);

	      else if (__len <= _M_string.max_size())

		{

		  // Force-allocate, re-sync.

		  _M_string = this->str();

		  _M_string.reserve(__len);

		  _M_buf_size = static_cast(__len);

		  _M_really_sync(_M_in_cur - _M_in_beg,

				 _M_out_cur - _M_out_beg);

		  *_M_out_cur = traits_type::to_char_type(__c);

		  _M_out_cur_move(1);

		  __ret = __c;

		}

	    }

	  else

	    __ret = traits_type::not_eof(__c);

	}

      return __ret;

    }

  template 

    basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type

    basic_stringbuf<_CharT, _Traits, _Alloc>::

    seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)

    {

      pos_type __ret =  pos_type(off_type(-1));

      bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;

      bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;

      bool __testboth = __testin && __testout && __way != ios_base::cur;

      if (_M_buf_size && ((__testin != __testout) || __testboth))

	{

	  char_type* __beg = _M_buf;

	  char_type* __curi = NULL;

	  char_type* __curo = NULL;

	  char_type* __endi = NULL;

	  char_type* __endo = NULL;

	  if (__testin)

	    {

	      __curi = this->gptr();

	      __endi = this->egptr();

	    }

	  if (__testout)

	    {

	      __curo = this->pptr();

	      __endo = this->epptr();

	    }

	  off_type __newoffi = 0;

	  off_type __newoffo = 0;

	  if (__way == ios_base::cur)

	    {

	      __newoffi = __curi - __beg;

	      __newoffo = __curo - __beg;

	    }

	  else if (__way == ios_base::end)

	    {

	      __newoffi = __endi - __beg;

	      __newoffo = __endo - __beg;

	    }

	  if (__testin

	      && __newoffi + __off >= 0 && __endi - __beg >= __newoffi + __off)

	    {

	      _M_in_cur = __beg + __newoffi + __off;

	      __ret = pos_type(__newoffi);

	    }

	  if (__testout

	      && __newoffo + __off >= 0 && __endo - __beg >= __newoffo + __off)

	    {

	      _M_out_cur_move(__newoffo + __off - (_M_out_cur - __beg));

	      __ret = pos_type(__newoffo);

	    }

	}

      return __ret;

    }

  template 

    basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type

    basic_stringbuf<_CharT, _Traits, _Alloc>::

    seekpos(pos_type __sp, ios_base::openmode __mode)

    {

      pos_type __ret =  pos_type(off_type(-1));

      off_type __pos = __sp._M_position();

      char_type* __beg = NULL;

      char_type* __end = NULL;

      bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;

      bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;

      if (__testin)

	{

	  __beg = this->eback();

	  __end = this->egptr();

	}

      if (__testout)

	{

	  __beg = this->pbase();

	  __end = _M_buf + _M_buf_size;

	}

      if (0 <= __pos && __pos <= __end - __beg)

	{

	  // Need to set both of these if applicable

	  if (__testin)

	    _M_in_cur = _M_in_beg + __pos;

	  if (__testout)

	    _M_out_cur_move((__pos) - (_M_out_cur - __beg));

	  __ret = pos_type(off_type(__pos));

	}

      return __ret;

    }

} // namespace std

#endif	/* _CPP_BITS_SSTREAM_TCC */