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// Stream buffer classes -*- C++ -*-

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

// 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 streambuf.tcc

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

 *  You should not attempt to use it directly.

 */

//

// ISO C++ 14882: 27.5  Stream buffers

//

#ifndef _STREAMBUF_TCC

#define _STREAMBUF_TCC 1

#pragma GCC system_header

namespace std

{

  template

    streamsize

    basic_streambuf<_CharT, _Traits>::

    xsgetn(char_type* __s, streamsize __n)

    {

      streamsize __ret = 0;

      while (__ret < __n)

        {

          const streamsize __buf_len = this->egptr() - this->gptr();

          if (__buf_len)

            {

              const streamsize __remaining = __n - __ret;

              const streamsize __len = std::min(__buf_len, __remaining);

              traits_type::copy(__s, this->gptr(), __len);

              __ret += __len;

              __s += __len;

              this->gbump(__len);

            }

          if (__ret < __n)

            {

              const int_type __c = this->uflow();

              if (!traits_type::eq_int_type(__c, traits_type::eof()))

                {

                  traits_type::assign(*__s++, traits_type::to_char_type(__c));

                  ++__ret;

                }

              else

                break;

            }

        }

      return __ret;

    }

  template

    streamsize

    basic_streambuf<_CharT, _Traits>::

    xsputn(const char_type* __s, streamsize __n)

    {

      streamsize __ret = 0;

      while (__ret < __n)

        {

          const streamsize __buf_len = this->epptr() - this->pptr();

          if (__buf_len)

            {

              const streamsize __remaining = __n - __ret;

              const streamsize __len = std::min(__buf_len, __remaining);

              traits_type::copy(this->pptr(), __s, __len);

              __ret += __len;

              __s += __len;

              this->pbump(__len);

            }

          if (__ret < __n)

            {

              int_type __c = this->overflow(traits_type::to_int_type(*__s));

              if (!traits_type::eq_int_type(__c, traits_type::eof()))

                {

                  ++__ret;

                  ++__s;

                }

              else

                break;

            }

        }

      return __ret;

    }

  // Conceivably, this could be used to implement buffer-to-buffer

  // copies, if this was ever desired in an un-ambiguous way by the

  // standard.

  template

    streamsize

    __copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin,

                      basic_streambuf<_CharT, _Traits>* __sbout)

    {

      streamsize __ret = 0;

      typename _Traits::int_type __c = __sbin->sgetc();

      while (!_Traits::eq_int_type(__c, _Traits::eof()))

        {

          __c = __sbout->sputc(_Traits::to_char_type(__c));

          if (_Traits::eq_int_type(__c, _Traits::eof()))

            break;

          ++__ret;

          __c = __sbin->snextc();

        }

      return __ret;

    }

  // 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_streambuf;

  extern template

    streamsize

    __copy_streambufs(basic_streambuf*, basic_streambuf*);

#ifdef _GLIBCXX_USE_WCHAR_T

  extern template class basic_streambuf;

  extern template

    streamsize

    __copy_streambufs(basic_streambuf*, basic_streambuf*);

#endif

#endif

} // namespace std

#endif