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

// Copyright (C) 1997-2013 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// .

/** @file bits/streambuf.tcc

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

 *  Do not attempt to use it directly. @headername{streambuf}

 */

//

// ISO C++ 14882: 27.5  Stream buffers

//

#ifndef _STREAMBUF_TCC

#define _STREAMBUF_TCC 1

#pragma GCC system_header

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  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->__safe_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->__safe_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_eof(basic_streambuf<_CharT, _Traits>* __sbin,

			  basic_streambuf<_CharT, _Traits>* __sbout,

			  bool& __ineof)

    {

      streamsize __ret = 0;

      __ineof = true;

      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()))

	    {

	      __ineof = false;

	      break;

	    }

	  ++__ret;

	  __c = __sbin->snextc();

	}

      return __ret;

    }

  template

    inline streamsize

    __copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin,

		      basic_streambuf<_CharT, _Traits>* __sbout)

    {

      bool __ineof;

      return __copy_streambufs_eof(__sbin, __sbout, __ineof);

    }

  // Inhibit implicit instantiations for required instantiations,

  // which are defined via explicit instantiations elsewhere.

#if _GLIBCXX_EXTERN_TEMPLATE

  extern template class basic_streambuf;

  extern template

    streamsize

    __copy_streambufs(basic_streambuf*,

		      basic_streambuf*);

  extern template

    streamsize

    __copy_streambufs_eof(basic_streambuf*,

			  basic_streambuf*, bool&);

#ifdef _GLIBCXX_USE_WCHAR_T

  extern template class basic_streambuf;

  extern template

    streamsize

    __copy_streambufs(basic_streambuf*,

		      basic_streambuf*);

  extern template

    streamsize

    __copy_streambufs_eof(basic_streambuf*,

			  basic_streambuf*, bool&);

#endif

#endif

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace std

#endif