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// Streambuf iterators

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

// 2006, 2007, 2009, 2010, 2011

// 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

// <http://www.gnu.org/licenses/>.

/** @file bits/streambuf_iterator.h

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

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

 */

#ifndef _STREAMBUF_ITERATOR_H

#define _STREAMBUF_ITERATOR_H 1

#pragma GCC system_header

#include <streambuf>

#include <debug/debug.h>

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /**

   * @addtogroup iterators

   * @{

   */

  // 24.5.3 Template class istreambuf_iterator

  /// Provides input iterator semantics for streambufs.

  template<typename _CharT, typename _Traits>

    class istreambuf_iterator

    : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,

                      _CharT*,

#if __cplusplus >= 201103L

    // LWG 445.

                      _CharT>

#else

                      _CharT&>

#endif

    {

    public:

      // Types:

      //@{

      /// Public typedefs

      typedef _CharT                                    char_type;

      typedef _Traits                                   traits_type;

      typedef typename _Traits::int_type                int_type;

      typedef basic_streambuf<_CharT, _Traits>          streambuf_type;

      typedef basic_istream<_CharT, _Traits>            istream_type;

      //@}

      template<typename _CharT2>

        friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,

                                    ostreambuf_iterator<_CharT2> >::__type

        copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,

             ostreambuf_iterator<_CharT2>);

      template<bool _IsMove, typename _CharT2>

        friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,

                                               _CharT2*>::__type

        __copy_move_a2(istreambuf_iterator<_CharT2>,

                       istreambuf_iterator<_CharT2>, _CharT2*);

      template<typename _CharT2>

        friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,

                                    istreambuf_iterator<_CharT2> >::__type

        find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,

             const _CharT2&);

    private:

      // 24.5.3 istreambuf_iterator

      // p 1

      // If the end of stream is reached (streambuf_type::sgetc()

      // returns traits_type::eof()), the iterator becomes equal to

      // the "end of stream" iterator value.

      // NB: This implementation assumes the "end of stream" value

      // is EOF, or -1.

      mutable streambuf_type*   _M_sbuf;

      mutable int_type          _M_c;

    public:

      ///  Construct end of input stream iterator.

      _GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT

      : _M_sbuf(0), _M_c(traits_type::eof()) { }

#if __cplusplus >= 201103L

      istreambuf_iterator(const istreambuf_iterator&) noexcept = default;

      ~istreambuf_iterator() = default;

#endif

      ///  Construct start of input stream iterator.

      istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT

      : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }

      ///  Construct start of streambuf iterator.

      istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT

      : _M_sbuf(__s), _M_c(traits_type::eof()) { }

      ///  Return the current character pointed to by iterator.  This returns

      ///  streambuf.sgetc().  It cannot be assigned.  NB: The result of

      ///  operator*() on an end of stream is undefined.

      char_type

      operator*() const

      {

#ifdef _GLIBCXX_DEBUG_PEDANTIC

        // Dereferencing a past-the-end istreambuf_iterator is a

        // libstdc++ extension

        __glibcxx_requires_cond(!_M_at_eof(),

                                _M_message(__gnu_debug::__msg_deref_istreambuf)

                                ._M_iterator(*this));

#endif

        return traits_type::to_char_type(_M_get());

      }

      /// Advance the iterator.  Calls streambuf.sbumpc().

      istreambuf_iterator&

      operator++()

      {

        __glibcxx_requires_cond(!_M_at_eof(),

                                _M_message(__gnu_debug::__msg_inc_istreambuf)

                                ._M_iterator(*this));

        if (_M_sbuf)

          {

            _M_sbuf->sbumpc();

            _M_c = traits_type::eof();

          }

        return *this;

      }

      /// Advance the iterator.  Calls streambuf.sbumpc().

      istreambuf_iterator

      operator++(int)

      {

        __glibcxx_requires_cond(!_M_at_eof(),

                                _M_message(__gnu_debug::__msg_inc_istreambuf)

                                ._M_iterator(*this));

        istreambuf_iterator __old = *this;

        if (_M_sbuf)

          {

            __old._M_c = _M_sbuf->sbumpc();

            _M_c = traits_type::eof();

          }

        return __old;

      }

      // _GLIBCXX_RESOLVE_LIB_DEFECTS

      // 110 istreambuf_iterator::equal not const

      // NB: there is also number 111 (NAD, Future) pending on this function.

      /// Return true both iterators are end or both are not end.

      bool

      equal(const istreambuf_iterator& __b) const

      { return _M_at_eof() == __b._M_at_eof(); }

    private:

      int_type

      _M_get() const

      {

        const int_type __eof = traits_type::eof();

        int_type __ret = __eof;

        if (_M_sbuf)

          {

            if (!traits_type::eq_int_type(_M_c, __eof))

              __ret = _M_c;

            else if (!traits_type::eq_int_type((__ret = _M_sbuf->sgetc()),

                                               __eof))

              _M_c = __ret;

            else

              _M_sbuf = 0;

          }

        return __ret;

      }

      bool

      _M_at_eof() const

      {

        const int_type __eof = traits_type::eof();

        return traits_type::eq_int_type(_M_get(), __eof);

      }

    };

  template<typename _CharT, typename _Traits>

    inline bool

    operator==(const istreambuf_iterator<_CharT, _Traits>& __a,

               const istreambuf_iterator<_CharT, _Traits>& __b)

    { return __a.equal(__b); }

  template<typename _CharT, typename _Traits>

    inline bool

    operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,

               const istreambuf_iterator<_CharT, _Traits>& __b)

    { return !__a.equal(__b); }

  /// Provides output iterator semantics for streambufs.

  template<typename _CharT, typename _Traits>

    class ostreambuf_iterator

    : public iterator<output_iterator_tag, void, void, void, void>

    {

    public:

      // Types:

      //@{

      /// Public typedefs

      typedef _CharT                           char_type;

      typedef _Traits                          traits_type;

      typedef basic_streambuf<_CharT, _Traits> streambuf_type;

      typedef basic_ostream<_CharT, _Traits>   ostream_type;

      //@}

      template<typename _CharT2>

        friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,

                                    ostreambuf_iterator<_CharT2> >::__type

        copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,

             ostreambuf_iterator<_CharT2>);

    private:

      streambuf_type*   _M_sbuf;

      bool              _M_failed;

    public:

      ///  Construct output iterator from ostream.

      ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT

      : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }

      ///  Construct output iterator from streambuf.

      ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT

      : _M_sbuf(__s), _M_failed(!_M_sbuf) { }

      ///  Write character to streambuf.  Calls streambuf.sputc().

      ostreambuf_iterator&

      operator=(_CharT __c)

      {

        if (!_M_failed &&

            _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))

          _M_failed = true;

        return *this;

      }

      /// Return *this.

      ostreambuf_iterator&

      operator*()

      { return *this; }

      /// Return *this.

      ostreambuf_iterator&

      operator++(int)

      { return *this; }

      /// Return *this.

      ostreambuf_iterator&

      operator++()

      { return *this; }

      /// Return true if previous operator=() failed.

      bool

      failed() const _GLIBCXX_USE_NOEXCEPT

      { return _M_failed; }

      ostreambuf_iterator&

      _M_put(const _CharT* __ws, streamsize __len)

      {

        if (__builtin_expect(!_M_failed, true)

            && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,

                                false))

          _M_failed = true;

        return *this;

      }

    };

  // Overloads for streambuf iterators.

  template<typename _CharT>

    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,

                                    ostreambuf_iterator<_CharT> >::__type

    copy(istreambuf_iterator<_CharT> __first,

         istreambuf_iterator<_CharT> __last,

         ostreambuf_iterator<_CharT> __result)

    {

      if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)

        {

          bool __ineof;

          __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);

          if (!__ineof)

            __result._M_failed = true;

        }

      return __result;

    }

  template<bool _IsMove, typename _CharT>

    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,

                                    ostreambuf_iterator<_CharT> >::__type

    __copy_move_a2(_CharT* __first, _CharT* __last,

                   ostreambuf_iterator<_CharT> __result)

    {

      const streamsize __num = __last - __first;

      if (__num > 0)

        __result._M_put(__first, __num);

      return __result;

    }

  template<bool _IsMove, typename _CharT>

    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,

                                    ostreambuf_iterator<_CharT> >::__type

    __copy_move_a2(const _CharT* __first, const _CharT* __last,

                   ostreambuf_iterator<_CharT> __result)

    {

      const streamsize __num = __last - __first;

      if (__num > 0)

        __result._M_put(__first, __num);

      return __result;

    }

  template<bool _IsMove, typename _CharT>

    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,

                                    _CharT*>::__type

    __copy_move_a2(istreambuf_iterator<_CharT> __first,

                   istreambuf_iterator<_CharT> __last, _CharT* __result)

    {

      typedef istreambuf_iterator<_CharT>                  __is_iterator_type;

      typedef typename __is_iterator_type::traits_type     traits_type;

      typedef typename __is_iterator_type::streambuf_type  streambuf_type;

      typedef typename traits_type::int_type               int_type;

      if (__first._M_sbuf && !__last._M_sbuf)

        {

          streambuf_type* __sb = __first._M_sbuf;

          int_type __c = __sb->sgetc();

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

            {

              const streamsize __n = __sb->egptr() - __sb->gptr();

              if (__n > 1)

                {

                  traits_type::copy(__result, __sb->gptr(), __n);

                  __sb->__safe_gbump(__n);

                  __result += __n;

                  __c = __sb->underflow();

                }

              else

                {

                  *__result++ = traits_type::to_char_type(__c);

                  __c = __sb->snextc();

                }

            }

        }

      return __result;

    }

  template<typename _CharT>

    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,

                                    istreambuf_iterator<_CharT> >::__type

    find(istreambuf_iterator<_CharT> __first,

         istreambuf_iterator<_CharT> __last, const _CharT& __val)

    {

      typedef istreambuf_iterator<_CharT>                  __is_iterator_type;

      typedef typename __is_iterator_type::traits_type     traits_type;

      typedef typename __is_iterator_type::streambuf_type  streambuf_type;

      typedef typename traits_type::int_type               int_type;

      if (__first._M_sbuf && !__last._M_sbuf)

        {

          const int_type __ival = traits_type::to_int_type(__val);

          streambuf_type* __sb = __first._M_sbuf;

          int_type __c = __sb->sgetc();

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

                 && !traits_type::eq_int_type(__c, __ival))

            {

              streamsize __n = __sb->egptr() - __sb->gptr();

              if (__n > 1)

                {

                  const _CharT* __p = traits_type::find(__sb->gptr(),

                                                        __n, __val);

                  if (__p)

                    __n = __p - __sb->gptr();

                  __sb->__safe_gbump(__n);

                  __c = __sb->sgetc();

                }

              else

                __c = __sb->snextc();

            }

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

            __first._M_c = __c;

          else

            __first._M_sbuf = 0;

        }

      return __first;

    }

// @} group iterators

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace

#endif