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

// Copyright (C) 1997-1999 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_SSTREAM

#define _CPP_SSTREAM	1

#pragma GCC system_header

#include 

#include 

namespace std

{

  template

    class basic_stringbuf : public basic_streambuf<_CharT, _Traits>

    {

    public:

      // Types:

      typedef _CharT 					char_type;

      typedef _Traits 					traits_type;

#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS

// 251. basic_stringbuf missing allocator_type

      typedef _Alloc				       	allocator_type;

#endif

      typedef typename traits_type::int_type 		int_type;

      typedef typename traits_type::pos_type 		pos_type;

      typedef typename traits_type::off_type 		off_type;

      // Non-standard Types:

      typedef basic_streambuf  	__streambuf_type;

      typedef basic_string 	__string_type;

      typedef typename __string_type::size_type		__size_type;

    private:

      // Data Members:

      __string_type 		_M_string;

    public:

      // Constructors:

      explicit

      basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out)

      : __streambuf_type(), _M_string()

      { _M_stringbuf_init(__mode); }

      explicit

      basic_stringbuf(const __string_type& __str,

		      ios_base::openmode __mode = ios_base::in | ios_base::out)

      : __streambuf_type(), _M_string(__str.c_str())

      { _M_stringbuf_init(__mode); }

      // Get and set:

      __string_type

      str() const

      {

	if (_M_mode & ios_base::out)

	  {

	    // This is the deal: _M_string.size() is value that

	    // represents the size of the intial string that makes

	    // _M_string, and may not be the correct size of the

	    // current stringbuf internal buffer.

	    __size_type __len = _M_string.size();

	    if (_M_out_cur > _M_out_beg)

	      __len = max(__size_type(_M_out_end - _M_out_beg), __len);

	    return __string_type(_M_out_beg, _M_out_beg + __len);

	  }

	else

	  return _M_string;

      }

      void

      str(const __string_type& __s)

      {

	_M_string = __s;

	_M_stringbuf_init(_M_mode);

      }

    protected:

      // Common initialization code for both ctors goes here.

      void

      _M_stringbuf_init(ios_base::openmode __mode)

      {

	// _M_buf_size is a convenient alias for "what the streambuf

	// thinks the allocated size of the string really is." This is

	// necessary as ostringstreams are implemented with the

	// streambufs having control of the allocation and

	// re-allocation of the internal string object, _M_string.

	_M_buf_size = _M_string.size();

	// NB: Start ostringstream buffers at 1024 bytes. This is an

	// experimental value (pronounced "arbitrary" in some of the

	// hipper english-speaking countries), and can be changed to

	// suite particular needs.

	_M_buf_size_opt = 512;

	_M_mode = __mode;

	if (_M_mode & ios_base::ate)

	  _M_really_sync(0, _M_buf_size);

	else

	  _M_really_sync(0, 0);

      }

      // Overridden virtual functions:

      virtual int_type

      underflow()

      {

	if (_M_in_cur && _M_in_cur < _M_in_end)

	  return traits_type::to_int_type(*gptr());

	else

	  return traits_type::eof();

      }

      virtual int_type

      pbackfail(int_type __c = traits_type::eof());

      virtual int_type

      overflow(int_type __c = traits_type::eof());

      virtual __streambuf_type*

      setbuf(char_type* __s, streamsize __n)

      {

	if (__s && __n)

	  {

	    _M_string = __string_type(__s, __n);

	    _M_really_sync(0, 0);

	  }

	return this;

      }

      virtual pos_type

      seekoff(off_type __off, ios_base::seekdir __way,

	      ios_base::openmode __mode = ios_base::in | ios_base::out);

      virtual pos_type

      seekpos(pos_type __sp,

	      ios_base::openmode __mode = ios_base::in | ios_base::out);

      // Internal function for correctly updating the internal buffer

      // for a particular _M_string, due to initialization or

      // re-sizing of an existing _M_string.

      // Assumes: contents of _M_string and internal buffer match exactly.

      // __i == _M_in_cur - _M_in_beg

      // __o == _M_out_cur - _M_out_beg

      virtual int

      _M_really_sync(__size_type __i, __size_type __o)

      {

	char_type* __base = const_cast(_M_string.data());

	bool __testin = _M_mode & ios_base::in;

	bool __testout = _M_mode & ios_base::out;

	__size_type __len = _M_string.size();

	_M_buf = __base;

	if (__testin)

	    this->setg(__base, __base + __i, __base + __len);

	if (__testout)

	  {

	    this->setp(__base, __base + __len);

	    _M_out_cur += __o;

	  }

	return 0;

      }

    };

  // 27.7.2  Template class basic_istringstream

  template

    class basic_istringstream : public basic_istream<_CharT, _Traits>

    {

    public:

      // Types:

      typedef _CharT 					char_type;

      typedef _Traits 					traits_type;

#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS

// 251. basic_stringbuf missing allocator_type

      typedef _Alloc				       	allocator_type;

#endif

      typedef typename traits_type::int_type 		int_type;

      typedef typename traits_type::pos_type 		pos_type;

      typedef typename traits_type::off_type 		off_type;

      // Non-standard types:

      typedef basic_string<_CharT, _Traits, _Alloc> 	__string_type;

      typedef basic_stringbuf<_CharT, _Traits, _Alloc> 	__stringbuf_type;

      typedef basic_istream	__istream_type;

    private:

      __stringbuf_type	_M_stringbuf;

    public:

      // Constructors:

      explicit

      basic_istringstream(ios_base::openmode __mode = ios_base::in)

      : __istream_type(NULL), _M_stringbuf(__mode | ios_base::in)

      { this->init(&_M_stringbuf); }

      explicit

      basic_istringstream(const __string_type& __str,

			  ios_base::openmode __mode = ios_base::in)

      : __istream_type(NULL), _M_stringbuf(__str, __mode | ios_base::in)

      { this->init(&_M_stringbuf); }

      ~basic_istringstream()

      { }

      // Members:

      __stringbuf_type*

      rdbuf() const

      { return const_cast<__stringbuf_type*>(&_M_stringbuf); }

      __string_type

      str() const

      { return _M_stringbuf.str(); }

      void

      str(const __string_type& __s)

      { _M_stringbuf.str(__s); }

    };

  // 27.7.3  Template class basic_ostringstream

  template 

    class basic_ostringstream : public basic_ostream<_CharT, _Traits>

    {

    public:

      // Types:

      typedef _CharT 					char_type;

      typedef _Traits 					traits_type;

#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS

// 251. basic_stringbuf missing allocator_type

      typedef _Alloc				       	allocator_type;

#endif

      typedef typename traits_type::int_type 		int_type;

      typedef typename traits_type::pos_type 		pos_type;

      typedef typename traits_type::off_type 		off_type;

      // Non-standard types:

      typedef basic_string<_CharT, _Traits, _Alloc> 	__string_type;

      typedef basic_stringbuf<_CharT, _Traits, _Alloc> 	__stringbuf_type;

      typedef basic_ostream	__ostream_type;

    private:

      __stringbuf_type	_M_stringbuf;

    public:

     // Constructors/destructor:

      explicit

      basic_ostringstream(ios_base::openmode __mode = ios_base::out)

      : __ostream_type(NULL), _M_stringbuf(__mode | ios_base::out)

      { this->init(&_M_stringbuf); }

      explicit

      basic_ostringstream(const __string_type __str,

			  ios_base::openmode __mode = ios_base::out)

      : __ostream_type(NULL), _M_stringbuf(__str, __mode | ios_base::out)

      { this->init(&_M_stringbuf); }

      ~basic_ostringstream()

      { }

      // Members:

      __stringbuf_type*

      rdbuf() const

      { return const_cast<__stringbuf_type*>(&_M_stringbuf); }

      __string_type

      str() const

      { return _M_stringbuf.str(); }

      void

      str(const __string_type& __s)

      { _M_stringbuf.str(__s); }

    };

  // 27.7.4  Template class basic_stringstream

  template 

    class basic_stringstream : public basic_iostream<_CharT, _Traits>

    {

    public:

      // Types:

      typedef _CharT 					char_type;

      typedef _Traits 					traits_type;

#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS

// 251. basic_stringbuf missing allocator_type

      typedef _Alloc				       	allocator_type;

#endif

      typedef typename traits_type::int_type 		int_type;

      typedef typename traits_type::pos_type 		pos_type;

      typedef typename traits_type::off_type 		off_type;

      // Non-standard Types:

      typedef basic_string<_CharT, _Traits, _Alloc> 	__string_type;

      typedef basic_stringbuf<_CharT, _Traits, _Alloc> 	__stringbuf_type;

      typedef basic_iostream	__iostream_type;

    private:

      __stringbuf_type	_M_stringbuf;

    public:

      // Constructors/destructors

      explicit

      basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)

      : __iostream_type(NULL), _M_stringbuf(__m)

      { this->init(&_M_stringbuf); }

      explicit

      basic_stringstream(const __string_type& __str,

			 ios_base::openmode __m = ios_base::out | ios_base::in)

      : __iostream_type(NULL), _M_stringbuf(__str, __m)

      { this->init(&_M_stringbuf); }

      ~basic_stringstream()

      { }

      // Members:

      __stringbuf_type*

      rdbuf() const

      { return const_cast<__stringbuf_type*>(&_M_stringbuf); }

      __string_type

      str() const

      { return _M_stringbuf.str(); }

      void

      str(const __string_type& __s)

      { _M_stringbuf.str(__s); }

    };

} // namespace std

#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT

# define export

#ifdef  _GLIBCPP_FULLY_COMPLIANT_HEADERS

# include 

#endif

#endif

#endif	// _CPP_SSTREAM