Subversion Repositories scarts

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

// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006

// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// 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.

/** @file sstream.tcc

 *  This is an internal header file, included by other library headers.

 *  You should not attempt to use it directly.

 */

//

// ISO C++ 14882: 27.7  String-based streams

//

#ifndef _SSTREAM_TCC

#define _SSTREAM_TCC 1

#pragma GCC system_header

#include 

namespace std

{

  template 

    typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type

    basic_stringbuf<_CharT, _Traits, _Alloc>::

    pbackfail(int_type __c)

    {

      int_type __ret = traits_type::eof();

      if (this->eback() < this->gptr())

        {

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

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

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

          if (!__testeof)

            {

              const bool __testeq = traits_type::eq(traits_type::

                                                    to_char_type(__c),

                                                    this->gptr()[-1]);

              const bool __testout = this->_M_mode & ios_base::out;

              if (__testeq || __testout)

                {

                  this->gbump(-1);

                  if (!__testeq)

                    *this->gptr() = traits_type::to_char_type(__c);

                  __ret = __c;

                }

            }

          else

            {

              this->gbump(-1);

              __ret = traits_type::not_eof(__c);

            }

        }

      return __ret;

    }

  template 

    typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type

    basic_stringbuf<_CharT, _Traits, _Alloc>::

    overflow(int_type __c)

    {

      const bool __testout = this->_M_mode & ios_base::out;

      if (__builtin_expect(!__testout, false))

        return traits_type::eof();

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

      if (__builtin_expect(__testeof, false))

        return traits_type::not_eof(__c);

      const __size_type __capacity = _M_string.capacity();

      const __size_type __max_size = _M_string.max_size();

      const bool __testput = this->pptr() < this->epptr();

      if (__builtin_expect(!__testput && __capacity == __max_size, false))

        return traits_type::eof();

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

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

      if (!__testput)

        {

          // NB: Start ostringstream buffers at 512 chars. This is an

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

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

          // suit particular needs.

          // Then, in virtue of DR 169 (TC) we are allowed to grow more

          // than one char.

          const __size_type __opt_len = std::max(__size_type(2 * __capacity),

                                                 __size_type(512));

          const __size_type __len = std::min(__opt_len, __max_size);

          __string_type __tmp;

          __tmp.reserve(__len);

          if (this->pbase())

            __tmp.assign(this->pbase(), this->epptr() - this->pbase());

          _M_string.swap(__tmp);

          _M_sync(const_cast(_M_string.data()),

                  this->gptr() - this->eback(), this->pptr() - this->pbase());

        }

      return this->sputc(traits_type::to_char_type(__c));

    }

  template 

    typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type

    basic_stringbuf<_CharT, _Traits, _Alloc>::

    underflow()

    {

      int_type __ret = traits_type::eof();

      const bool __testin = this->_M_mode & ios_base::in;

      if (__testin)

        {

          // Update egptr() to match the actual string end.

          _M_update_egptr();

          if (this->gptr() < this->egptr())

            __ret = traits_type::to_int_type(*this->gptr());

        }

      return __ret;

    }

  template 

    typename 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 = (ios_base::in & this->_M_mode & __mode) != 0;

      bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;

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

      __testin &= !(__mode & ios_base::out);

      __testout &= !(__mode & ios_base::in);

      // _GLIBCXX_RESOLVE_LIB_DEFECTS

      // 453. basic_stringbuf::seekoff need not always fail for an empty stream.

      const char_type* __beg = __testin ? this->eback() : this->pbase();

      if ((__beg || !__off) && (__testin || __testout || __testboth))

        {

          _M_update_egptr();

          off_type __newoffi = __off;

          off_type __newoffo = __newoffi;

          if (__way == ios_base::cur)

            {

              __newoffi += this->gptr() - __beg;

              __newoffo += this->pptr() - __beg;

            }

          else if (__way == ios_base::end)

            __newoffo = __newoffi += this->egptr() - __beg;

          if ((__testin || __testboth)

              && __newoffi >= 0

              && this->egptr() - __beg >= __newoffi)

            {

              this->gbump((__beg + __newoffi) - this->gptr());

              __ret = pos_type(__newoffi);

            }

          if ((__testout || __testboth)

              && __newoffo >= 0

              && this->egptr() - __beg >= __newoffo)

            {

              this->pbump((__beg + __newoffo) - this->pptr());

              __ret = pos_type(__newoffo);

            }

        }

      return __ret;

    }

  template 

    typename 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));

      const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;

      const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;

      const char_type* __beg = __testin ? this->eback() : this->pbase();

      if (__beg && (__testin || __testout))

        {

          _M_update_egptr();

          const off_type __pos(__sp);

          const bool __testpos = 0 <= __pos

                                 && __pos <=  this->egptr() - __beg;

          if (__testpos)

            {

              if (__testin)

                this->gbump((__beg + __pos) - this->gptr());

              if (__testout)

                this->pbump((__beg + __pos) - this->pptr());

              __ret = __sp;

            }

        }

      return __ret;

    }

  template 

    void

    basic_stringbuf<_CharT, _Traits, _Alloc>::

    _M_sync(char_type* __base, __size_type __i, __size_type __o)

    {

      const bool __testin = _M_mode & ios_base::in;

      const bool __testout = _M_mode & ios_base::out;

      char_type* __endg = __base + _M_string.size();

      char_type* __endp = __base + _M_string.capacity();

      if (__base != _M_string.data())

        {

          // setbuf: __i == size of buffer area (_M_string.size() == 0).

          __endg += __i;

          __i = 0;

          __endp = __endg;

        }

      if (__testin)

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

      if (__testout)

        {

          this->setp(__base, __endp);

          this->pbump(__o);

          // egptr() always tracks the string end.  When !__testin,

          // for the correct functioning of the streambuf inlines

          // the other get area pointers are identical.

          if (!__testin)

            this->setg(__endg, __endg, __endg);

        }

    }

  // Inhibit implicit instantiations for required instantiations,

  // which are defined via explicit instantiations elsewhere.

  // NB:  This syntax is a GNU extension.

#if _GLIBCXX_EXTERN_TEMPLATE

  extern template class basic_stringbuf;

  extern template class basic_istringstream;

  extern template class basic_ostringstream;

  extern template class basic_stringstream;

#ifdef _GLIBCXX_USE_WCHAR_T

  extern template class basic_stringbuf;

  extern template class basic_istringstream;

  extern template class basic_ostringstream;

  extern template class basic_stringstream;

#endif

#endif

} // namespace std

#endif