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

// Copyright (C) 1997, 1998, 1999, 2000, 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: 27.5  Stream buffers

//

#ifndef _CPP_BITS_STREAMBUF_TCC

#define _CPP_BITS_STREAMBUF_TCC 1

namespace std {

  template

    basic_streambuf<_CharT, _Traits>::int_type

    basic_streambuf<_CharT, _Traits>::

    sbumpc()

    {

      int_type __ret;

      if (_M_in_cur && _M_in_cur < _M_in_end)

	{

	  char_type __c = *gptr();

	  _M_in_cur_move(1);

	  __ret = traits_type::to_int_type(__c);

	}

      else

	__ret = this->uflow();

      return __ret;

    }

  template

    basic_streambuf<_CharT, _Traits>::int_type

    basic_streambuf<_CharT, _Traits>::

    sputbackc(char_type __c)

    {

      int_type __ret;

      bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur;

      bool __testne = _M_in_cur && !traits_type::eq(__c, this->gptr()[-1]);

      if (!__testpos || __testne)

	__ret = pbackfail(traits_type::to_int_type(__c));

      else

	{

	  _M_in_cur_move(-1);

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

	}

      return __ret;

    }

  template

    basic_streambuf<_CharT, _Traits>::int_type

    basic_streambuf<_CharT, _Traits>::

    sungetc()

    {

      int_type __ret;

      if (_M_in_cur && _M_in_beg < _M_in_cur)

	{

	  _M_in_cur_move(-1);

	  __ret = traits_type::to_int_type(*_M_in_cur);

	}

      else

	__ret = this->pbackfail();

      return __ret;

    }

  // Don't test against _M_buf + _M_buf_size, because _M_buf reflects

  // allocated space, and on certain (rare but entirely legal)

  // situations, there will be no allocated space yet the internal

  // buffers will still be valid. (This happens if setp is used to set

  // the internal buffer to say some externally-allocated sequence.)

  template

    basic_streambuf<_CharT, _Traits>::int_type

    basic_streambuf<_CharT, _Traits>::

    sputc(char_type __c)

    {

      int_type __ret;

      if (_M_out_buf_size())

	{

	  *_M_out_cur = __c;

	  _M_out_cur_move(1);

	  __ret = traits_type::to_int_type(__c);

	}

      else

	__ret = this->overflow(traits_type::to_int_type(__c));

      return __ret;

    }

  template

    streamsize

    basic_streambuf<_CharT, _Traits>::

    xsgetn(char_type* __s, streamsize __n)

    {

      streamsize __ret = 0;

      while (__ret < __n)

	{

	  size_t __buf_len = _M_in_end - _M_in_cur;

	  if (__buf_len > 0)

	    {

	      size_t __remaining = __n - __ret;

	      size_t __len = min(__buf_len, __remaining);

	      traits_type::copy(__s, _M_in_cur, __len);

	      __ret += __len;

	      __s += __len;

	      _M_in_cur_move(__len);

	    }

	  if (__ret < __n)

	    {

	      int_type __c = this->uflow();

	      if (__c != traits_type::eof())

		{

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

		  ++__ret;

		}

	      else

		break;

	    }

	}

      return __ret;

    }

  // Don't test against _M_buf + _M_buf_size, because _M_buf reflects

  // allocated space, and on certain (rare but entirely legal)

  // situations, there will be no allocated space yet the internal

  // buffers will still be valid. (This happens if setp is used to set

  // the internal buffer to say some externally-allocated sequence.)

  template

    streamsize

    basic_streambuf<_CharT, _Traits>::

    xsputn(const char_type* __s, streamsize __n)

    {

      streamsize __ret = 0;

      while (__ret < __n)

	{

	  off_type __buf_len = _M_out_buf_size();

	  if (__buf_len > 0)

	    {

	      off_type __remaining = __n - __ret;

	      off_type __len = min(__buf_len, __remaining);

	      traits_type::copy(_M_out_cur, __s, __len);

	      __ret += __len;

	      __s += __len;

	      _M_out_cur_move(__len);

	    }

	  if (__ret < __n)

	    {

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

	      if (__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. If so, then checks for __ios being zero would be

  // necessary.

  template

    streamsize

    __copy_streambufs(basic_ios<_CharT, _Traits>& __ios,

		      basic_streambuf<_CharT, _Traits>* __sbin,

		      basic_streambuf<_CharT, _Traits>* __sbout)

  {

      typedef typename _Traits::int_type	int_type;

      streamsize __ret = 0;

      streamsize __bufsize = __sbin->in_avail();

      streamsize __xtrct;

      bool __testput = __sbout->_M_mode & ios_base::out;

      try {

	while (__testput && __bufsize != -1)

	  {

	    __xtrct = __sbout->sputn(__sbin->gptr(), __bufsize);

	    __ret += __xtrct;

	    __sbin->_M_in_cur_move(__xtrct);

	    if (__xtrct == __bufsize)

	      {

		int_type __c = __sbin->sgetc();

		if (__c == _Traits::eof())

		  {

		    __ios.setstate(ios_base::eofbit);

		    break;

		  }

		__bufsize = __sbin->in_avail();

	      }

	    else

	      break;

	  }

      }

      catch(exception& __fail) {

	if ((__ios.exceptions() & ios_base::failbit) != 0)

	  __throw_exception_again;

      }

      return __ret;

    }

} // namespace std

#endif // _CPP_BITS_STREAMBUF_TCC