[thirdparty/gcc.git] / libstdc++-v3 / include / bits / streambuf_iterator.h

// Streambuf iterators

// Copyright (C) 1997-2021 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*, _CharT>
    {
    public:
      // Types:
      //@{
      /// Public typedefs
#if __cplusplus < 201103L
      typedef _CharT& reference; // Changed to _CharT by LWG 445
#elif __cplusplus > 201703L
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 3188. istreambuf_iterator::pointer should not be unspecified
      using pointer = void;
#endif

      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, typename _Size>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
					       _CharT2*>::__type
	__copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*, bool);

      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&);

      template<typename _CharT2, typename _Distance>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
					       void>::__type
	advance(istreambuf_iterator<_CharT2>&, _Distance);

    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;
      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 > 201703L && __cpp_lib_concepts
      constexpr istreambuf_iterator(default_sentinel_t) noexcept
      : istreambuf_iterator() { }
#endif

#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()) { }

#if __cplusplus >= 201103L
      istreambuf_iterator&
      operator=(const istreambuf_iterator&) noexcept = default;
#endif

      ///  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
      {
	int_type __c = _M_get();

#ifdef _GLIBCXX_DEBUG_PEDANTIC
	// Dereferencing a past-the-end istreambuf_iterator is a
	// libstdc++ extension
	__glibcxx_requires_cond(!_S_is_eof(__c),
				_M_message(__gnu_debug::__msg_deref_istreambuf)
				._M_iterator(*this));
#endif
	return traits_type::to_char_type(__c);
      }

      /// Advance the iterator.  Calls streambuf.sbumpc().
      istreambuf_iterator&
      operator++()
      {
	__glibcxx_requires_cond(_M_sbuf &&
				(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
				_M_message(__gnu_debug::__msg_inc_istreambuf)
				._M_iterator(*this));

	_M_sbuf->sbumpc();
	_M_c = traits_type::eof();
	return *this;
      }

      /// Advance the iterator.  Calls streambuf.sbumpc().
      istreambuf_iterator
      operator++(int)
      {
	__glibcxx_requires_cond(_M_sbuf &&
				(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
				_M_message(__gnu_debug::__msg_inc_istreambuf)
				._M_iterator(*this));

	istreambuf_iterator __old = *this;
	__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) relevant to 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
      {
	int_type __ret = _M_c;
	if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc()))
	  _M_sbuf = 0;
	return __ret;
      }

      bool
      _M_at_eof() const
      { return _S_is_eof(_M_get()); }

      static bool
      _S_is_eof(int_type __c)
      {
	const int_type __eof = traits_type::eof();
	return traits_type::eq_int_type(__c, __eof);
      }

#if __cplusplus > 201703L && __cpp_lib_concepts
      friend bool
      operator==(const istreambuf_iterator& __i, default_sentinel_t __s)
      { return __i._M_at_eof(); }
#endif
    };

  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
#if __cplusplus > 201703L
      using difference_type = ptrdiff_t;
#endif
      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:

#if __cplusplus > 201703L
      constexpr
      ostreambuf_iterator() noexcept
      : _M_sbuf(nullptr), _M_failed(true) { }
#endif

      ///  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 _Size>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    _CharT*>::__type
    __copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result,
	       bool __strict __attribute__((__unused__)))
    {
      if (__n == 0)
	return __result;

      __glibcxx_requires_cond(__it._M_sbuf,
			      _M_message(__gnu_debug::__msg_inc_istreambuf)
			      ._M_iterator(__it));
      _CharT* __beg = __result;
      __result += __it._M_sbuf->sgetn(__beg, __n);
      __glibcxx_requires_cond(!__strict || __result - __beg == __n,
			      _M_message(__gnu_debug::__msg_inc_istreambuf)
			      ._M_iterator(__it));
      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;
      const int_type __eof = traits_type::eof();

      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, __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();
	    }

	  __first._M_c = __eof;
	}

      return __first;
    }

  template<typename _CharT, typename _Distance>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    void>::__type
    advance(istreambuf_iterator<_CharT>& __i, _Distance __n)
    {
      if (__n == 0)
	return;

      __glibcxx_assert(__n > 0);
      __glibcxx_requires_cond(!__i._M_at_eof(),
			      _M_message(__gnu_debug::__msg_inc_istreambuf)
			      ._M_iterator(__i));

      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;
      const int_type __eof = traits_type::eof();

      streambuf_type* __sb = __i._M_sbuf;
      while (__n > 0)
	{
	  streamsize __size = __sb->egptr() - __sb->gptr();
	  if (__size > __n)
	    {
	      __sb->__safe_gbump(__n);
	      break;
	    }

	  __sb->__safe_gbump(__size);
	  __n -= __size;
	  if (traits_type::eq_int_type(__sb->underflow(), __eof))
	    {
	      __glibcxx_requires_cond(__n == 0,
				_M_message(__gnu_debug::__msg_inc_istreambuf)
				._M_iterator(__i));
	      break;
	    }
	}

      __i._M_c = __eof;
    }

// @} group iterators

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif
Commit	Line	Data
725dc051 BK	1	// Streambuf iterators
725dc051 BK	2
99dee823	3	// Copyright (C) 1997-2021 Free Software Foundation, Inc.
725dc051 BK	4	//
	5	// This file is part of the GNU ISO C++ Library. This library is free
	6	// software; you can redistribute it and/or modify it under the
	7	// terms of the GNU General Public License as published by the
748086b7	8	// Free Software Foundation; either version 3, or (at your option)
725dc051 BK	9	// any later version.
	10
	11	// This library is distributed in the hope that it will be useful,
	12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	// GNU General Public License for more details.
	15
748086b7 JJ	16	// Under Section 7 of GPL version 3, you are granted additional
	17	// permissions described in the GCC Runtime Library Exception, version
	18	// 3.1, as published by the Free Software Foundation.
	19
	20	// You should have received a copy of the GNU General Public License and
	21	// a copy of the GCC Runtime Library Exception along with this program;
	22	// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
	23	// <http://www.gnu.org/licenses/>.
725dc051	24
f910786b	25	/** @file bits/streambuf_iterator.h
729e3d3f	26	* This is an internal header file, included by other library headers.
f910786b	27	* Do not attempt to use it directly. @headername{iterator}
729e3d3f PE	28	*/
729e3d3f PE	29
3d7c150e BK	30	#ifndef _STREAMBUF_ITERATOR_H
3d7c150e BK	31	#define _STREAMBUF_ITERATOR_H 1
725dc051	32
b0a85b86 GDR	33	#pragma GCC system_header
b0a85b86 GDR	34
2e2a38cd	35	#include <streambuf>
285b36d6	36	#include <debug/debug.h>
2e2a38cd	37
12ffa228 BK	38	namespace std _GLIBCXX_VISIBILITY(default)
	39	{
	40	_GLIBCXX_BEGIN_NAMESPACE_VERSION
e324f9cb	41
8e32aa11 BK	42	/**
	43	* @addtogroup iterators
	44	* @{
	45	*/
	46
725dc051	47	// 24.5.3 Template class istreambuf_iterator
ffcec5c8	48	/// Provides input iterator semantics for streambufs.
39003c99	49	template<typename _CharT, typename _Traits>
725dc051 BK	50	class istreambuf_iterator
725dc051 BK	51	: public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
7918cb93	52	_CharT*, _CharT>
725dc051 BK	53	{
725dc051 BK	54	public:
725dc051	55	// Types:
ffcec5c8 JQ	56	//@{
ffcec5c8 JQ	57	/// Public typedefs
7918cb93 JW	58	#if __cplusplus < 201103L
	59	typedef _CharT& reference; // Changed to _CharT by LWG 445
	60	#elif __cplusplus > 201703L
9aeb3bef JW	61	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	62	// 3188. istreambuf_iterator::pointer should not be unspecified
	63	using pointer = void;
	64	#endif
7918cb93	65
ed6814f7 BI	66	typedef _CharT char_type;
	67	typedef _Traits traits_type;
	68	typedef typename _Traits::int_type int_type;
	69	typedef basic_streambuf<_CharT, _Traits> streambuf_type;
	70	typedef basic_istream<_CharT, _Traits> istream_type;
ffcec5c8	71	//@}
725dc051	72
0002d5d2	73	template<typename _CharT2>
105c6331	74	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
e324f9cb	75	ostreambuf_iterator<_CharT2> >::__type
0002d5d2 PC	76	copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	77	ostreambuf_iterator<_CharT2>);
	78
f0112db9	79	template<bool _IsMove, typename _CharT2>
e324f9cb	80	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
105c6331	81	_CharT2*>::__type
f0112db9 PC	82	__copy_move_a2(istreambuf_iterator<_CharT2>,
f0112db9 PC	83	istreambuf_iterator<_CharT2>, _CharT2*);
0002d5d2	84
8ab38f6c	85	template<typename _CharT2, typename _Size>
4e05c918 FD	86	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
	87	_CharT2*>::__type
	88	__copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*, bool);
8ab38f6c	89
0002d5d2	90	template<typename _CharT2>
105c6331	91	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
e324f9cb	92	istreambuf_iterator<_CharT2> >::__type
0002d5d2	93	find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
976e25f4	94	const _CharT2&);
0002d5d2	95
e324f9cb FD	96	template<typename _CharT2, typename _Distance>
	97	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
	98	void>::__type
	99	advance(istreambuf_iterator<_CharT2>&, _Distance);
	100
39003c99	101	private:
ed6814f7 BI	102	// 24.5.3 istreambuf_iterator
ed6814f7 BI	103	// p 1
39003c99 BK	104	// If the end of stream is reached (streambuf_type::sgetc()
	105	// returns traits_type::eof()), the iterator becomes equal to
	106	// the "end of stream" iterator value.
	107	// NB: This implementation assumes the "end of stream" value
	108	// is EOF, or -1.
ed6814f7	109	mutable streambuf_type* _M_sbuf;
4e914524	110	int_type _M_c;
39003c99 BK	111
39003c99 BK	112	public:
ffcec5c8	113	/// Construct end of input stream iterator.
23e4c4ee	114	_GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT
f13a69ec	115	: _M_sbuf(0), _M_c(traits_type::eof()) { }
ed6814f7	116
07522ae9	117	#if __cplusplus > 201703L && __cpp_lib_concepts
120e8734 JW	118	constexpr istreambuf_iterator(default_sentinel_t) noexcept
	119	: istreambuf_iterator() { }
	120	#endif
	121
734f5023	122	#if __cplusplus >= 201103L
23e4c4ee PC	123	istreambuf_iterator(const istreambuf_iterator&) noexcept = default;
	124
	125	~istreambuf_iterator() = default;
	126	#endif
	127
ffcec5c8	128	/// Construct start of input stream iterator.
23e4c4ee	129	istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT
f13a69ec	130	: _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
725dc051	131
ffcec5c8	132	/// Construct start of streambuf iterator.
23e4c4ee	133	istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
f13a69ec	134	: _M_sbuf(__s), _M_c(traits_type::eof()) { }
ed6814f7	135
a1417556 JW	136	#if __cplusplus >= 201103L
	137	istreambuf_iterator&
	138	operator=(const istreambuf_iterator&) noexcept = default;
	139	#endif
	140
ffcec5c8 JQ	141	/// Return the current character pointed to by iterator. This returns
	142	/// streambuf.sgetc(). It cannot be assigned. NB: The result of
	143	/// operator*() on an end of stream is undefined.
ed6814f7	144	char_type
725dc051	145	operator*() const
ed6814f7	146	{
4e914524 PO	147	int_type __c = _M_get();
4e914524 PO	148
285b36d6 BK	149	#ifdef _GLIBCXX_DEBUG_PEDANTIC
	150	// Dereferencing a past-the-end istreambuf_iterator is a
	151	// libstdc++ extension
4e914524	152	__glibcxx_requires_cond(!_S_is_eof(__c),
285b36d6	153	_M_message(__gnu_debug::__msg_deref_istreambuf)
ed6814f7	154	._M_iterator(*this));
285b36d6	155	#endif
4e914524	156	return traits_type::to_char_type(__c);
285b36d6	157	}
ffcec5c8 JQ	158
ffcec5c8 JQ	159	/// Advance the iterator. Calls streambuf.sbumpc().
ed6814f7	160	istreambuf_iterator&
725dc051	161	operator++()
ed6814f7	162	{
4e914524 PO	163	__glibcxx_requires_cond(_M_sbuf &&
4e914524 PO	164	(!_S_is_eof(_M_c) \|\| !_S_is_eof(_M_sbuf->sgetc())),
285b36d6	165	_M_message(__gnu_debug::__msg_inc_istreambuf)
ed6814f7	166	._M_iterator(*this));
4e914524 PO	167
	168	_M_sbuf->sbumpc();
	169	_M_c = traits_type::eof();
ed6814f7	170	return *this;
725dc051 BK	171	}
725dc051 BK	172
ffcec5c8	173	/// Advance the iterator. Calls streambuf.sbumpc().
b581eaf7	174	istreambuf_iterator
725dc051 BK	175	operator++(int)
725dc051 BK	176	{
4e914524 PO	177	__glibcxx_requires_cond(_M_sbuf &&
4e914524 PO	178	(!_S_is_eof(_M_c) \|\| !_S_is_eof(_M_sbuf->sgetc())),
285b36d6	179	_M_message(__gnu_debug::__msg_inc_istreambuf)
ed6814f7	180	._M_iterator(*this));
285b36d6	181
b581eaf7	182	istreambuf_iterator __old = *this;
4e914524 PO	183	__old._M_c = _M_sbuf->sbumpc();
4e914524 PO	184	_M_c = traits_type::eof();
ed6814f7	185	return __old;
725dc051	186	}
725dc051	187
f5677b15	188	// _GLIBCXX_RESOLVE_LIB_DEFECTS
725dc051	189	// 110 istreambuf_iterator::equal not const
0e7300bb	190	// NB: there is also number 111 (NAD) relevant to this function.
ffcec5c8	191	/// Return true both iterators are end or both are not end.
ed6814f7	192	bool
b581eaf7	193	equal(const istreambuf_iterator& __b) const
6bfcbf0d	194	{ return _M_at_eof() == __b._M_at_eof(); }
9875ea05 BK	195
9875ea05 BK	196	private:
ed6814f7	197	int_type
9875ea05	198	_M_get() const
ed6814f7	199	{
4e914524 PO	200	int_type __ret = _M_c;
	201	if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc()))
	202	_M_sbuf = 0;
9875ea05 BK	203	return __ret;
9875ea05 BK	204	}
285b36d6	205
ed6814f7	206	bool
285b36d6	207	_M_at_eof() const
4e914524 PO	208	{ return _S_is_eof(_M_get()); }
	209
	210	static bool
	211	_S_is_eof(int_type __c)
285b36d6 BK	212	{
285b36d6 BK	213	const int_type __eof = traits_type::eof();
4e914524	214	return traits_type::eq_int_type(__c, __eof);
285b36d6	215	}
120e8734	216
07522ae9	217	#if __cplusplus > 201703L && __cpp_lib_concepts
120e8734 JW	218	friend bool
	219	operator==(const istreambuf_iterator& __i, default_sentinel_t __s)
	220	{ return __i._M_at_eof(); }
	221	#endif
725dc051 BK	222	};
	223
	224	template<typename _CharT, typename _Traits>
ed6814f7	225	inline bool
725dc051 BK	226	operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
	227	const istreambuf_iterator<_CharT, _Traits>& __b)
	228	{ return __a.equal(__b); }
	229
	230	template<typename _CharT, typename _Traits>
ed6814f7	231	inline bool
725dc051 BK	232	operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
	233	const istreambuf_iterator<_CharT, _Traits>& __b)
	234	{ return !__a.equal(__b); }
5c352a47	235
ffcec5c8	236	/// Provides output iterator semantics for streambufs.
5c352a47 BK	237	template<typename _CharT, typename _Traits>
	238	class ostreambuf_iterator
	239	: public iterator<output_iterator_tag, void, void, void, void>
	240	{
	241	public:
	242	// Types:
ffcec5c8 JQ	243	//@{
ffcec5c8 JQ	244	/// Public typedefs
9aeb3bef JW	245	#if __cplusplus > 201703L
	246	using difference_type = ptrdiff_t;
	247	#endif
e324f9cb FD	248	typedef _CharT char_type;
e324f9cb FD	249	typedef _Traits traits_type;
5c352a47 BK	250	typedef basic_streambuf<_CharT, _Traits> streambuf_type;
5c352a47 BK	251	typedef basic_ostream<_CharT, _Traits> ostream_type;
ffcec5c8	252	//@}
5c352a47	253
0002d5d2	254	template<typename _CharT2>
105c6331	255	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
e324f9cb	256	ostreambuf_iterator<_CharT2> >::__type
0002d5d2 PC	257	copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	258	ostreambuf_iterator<_CharT2>);
	259
5c352a47	260	private:
ed6814f7 BI	261	streambuf_type* _M_sbuf;
ed6814f7 BI	262	bool _M_failed;
5c352a47 BK	263
5c352a47 BK	264	public:
9aeb3bef JW	265
	266	#if __cplusplus > 201703L
	267	constexpr
	268	ostreambuf_iterator() noexcept
	269	: _M_sbuf(nullptr), _M_failed(true) { }
	270	#endif
	271
ffcec5c8	272	/// Construct output iterator from ostream.
23e4c4ee	273	ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT
5c352a47	274	: _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
ed6814f7	275
ffcec5c8	276	/// Construct output iterator from streambuf.
23e4c4ee	277	ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
5c352a47 BK	278	: _M_sbuf(__s), _M_failed(!_M_sbuf) { }
5c352a47 BK	279
ffcec5c8	280	/// Write character to streambuf. Calls streambuf.sputc().
ed6814f7	281	ostreambuf_iterator&
2e2a38cd BK	282	operator=(_CharT __c)
2e2a38cd BK	283	{
ed6814f7	284	if (!_M_failed &&
2e2a38cd BK	285	_Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
	286	_M_failed = true;
	287	return *this;
	288	}
5c352a47	289
ffcec5c8	290	/// Return *this.
ed6814f7	291	ostreambuf_iterator&
e0ec69c9	292	operator*()
5c352a47 BK	293	{ return *this; }
5c352a47 BK	294
ffcec5c8	295	/// Return *this.
ed6814f7	296	ostreambuf_iterator&
e0ec69c9	297	operator++(int)
5c352a47 BK	298	{ return *this; }
5c352a47 BK	299
ffcec5c8	300	/// Return *this.
ed6814f7	301	ostreambuf_iterator&
e0ec69c9	302	operator++()
5c352a47 BK	303	{ return *this; }
5c352a47 BK	304
ffcec5c8	305	/// Return true if previous operator=() failed.
ed6814f7	306	bool
23e4c4ee	307	failed() const _GLIBCXX_USE_NOEXCEPT
5c352a47	308	{ return _M_failed; }
5c352a47	309
ed6814f7	310	ostreambuf_iterator&
2e2a38cd BK	311	_M_put(const _CharT* __ws, streamsize __len)
2e2a38cd BK	312	{
53279c10	313	if (__builtin_expect(!_M_failed, true)
15d72060 PC	314	&& __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
15d72060 PC	315	false))
53279c10	316	_M_failed = true;
2e2a38cd BK	317	return *this;
	318	}
	319	};
3cbc7af0	320
0002d5d2 PC	321	// Overloads for streambuf iterators.
0002d5d2 PC	322	template<typename _CharT>
105c6331	323	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
e324f9cb	324	ostreambuf_iterator<_CharT> >::__type
0002d5d2 PC	325	copy(istreambuf_iterator<_CharT> __first,
	326	istreambuf_iterator<_CharT> __last,
	327	ostreambuf_iterator<_CharT> __result)
	328	{
	329	if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)
	330	{
	331	bool __ineof;
	332	__copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);
	333	if (!__ineof)
	334	__result._M_failed = true;
	335	}
	336	return __result;
	337	}
	338
f0112db9	339	template<bool _IsMove, typename _CharT>
e324f9cb FD	340	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
e324f9cb FD	341	ostreambuf_iterator<_CharT> >::__type
f0112db9 PC	342	__copy_move_a2(_CharT* __first, _CharT* __last,
f0112db9 PC	343	ostreambuf_iterator<_CharT> __result)
0002d5d2 PC	344	{
	345	const streamsize __num = __last - __first;
	346	if (__num > 0)
	347	__result._M_put(__first, __num);
	348	return __result;
	349	}
	350
f0112db9	351	template<bool _IsMove, typename _CharT>
105c6331 BK	352	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
105c6331 BK	353	ostreambuf_iterator<_CharT> >::__type
f0112db9 PC	354	__copy_move_a2(const _CharT* __first, const _CharT* __last,
f0112db9 PC	355	ostreambuf_iterator<_CharT> __result)
0002d5d2 PC	356	{
	357	const streamsize __num = __last - __first;
	358	if (__num > 0)
	359	__result._M_put(__first, __num);
	360	return __result;
	361	}
	362
f0112db9	363	template<bool _IsMove, typename _CharT>
e324f9cb FD	364	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
e324f9cb FD	365	_CharT*>::__type
f0112db9 PC	366	__copy_move_a2(istreambuf_iterator<_CharT> __first,
f0112db9 PC	367	istreambuf_iterator<_CharT> __last, _CharT* __result)
0002d5d2	368	{
e324f9cb FD	369	typedef istreambuf_iterator<_CharT> __is_iterator_type;
e324f9cb FD	370	typedef typename __is_iterator_type::traits_type traits_type;
0002d5d2	371	typedef typename __is_iterator_type::streambuf_type streambuf_type;
e324f9cb	372	typedef typename traits_type::int_type int_type;
0002d5d2 PC	373
	374	if (__first._M_sbuf && !__last._M_sbuf)
	375	{
	376	streambuf_type* __sb = __first._M_sbuf;
	377	int_type __c = __sb->sgetc();
	378	while (!traits_type::eq_int_type(__c, traits_type::eof()))
	379	{
	380	const streamsize __n = __sb->egptr() - __sb->gptr();
	381	if (__n > 1)
	382	{
	383	traits_type::copy(__result, __sb->gptr(), __n);
1139a735	384	__sb->__safe_gbump(__n);
0002d5d2 PC	385	__result += __n;
	386	__c = __sb->underflow();
	387	}
	388	else
	389	{
	390	*__result++ = traits_type::to_char_type(__c);
	391	__c = __sb->snextc();
	392	}
	393	}
	394	}
	395	return __result;
	396	}
	397
8ab38f6c	398	template<typename _CharT, typename _Size>
4e05c918 FD	399	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
	400	_CharT*>::__type
	401	__copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result,
	402	bool __strict __attribute__((__unused__)))
8ab38f6c FD	403	{
	404	if (__n == 0)
	405	return __result;
	406
	407	__glibcxx_requires_cond(__it._M_sbuf,
	408	_M_message(__gnu_debug::__msg_inc_istreambuf)
	409	._M_iterator(__it));
	410	_CharT* __beg = __result;
	411	__result += __it._M_sbuf->sgetn(__beg, __n);
4e05c918	412	__glibcxx_requires_cond(!__strict \|\| __result - __beg == __n,
8ab38f6c FD	413	_M_message(__gnu_debug::__msg_inc_istreambuf)
	414	._M_iterator(__it));
	415	return __result;
	416	}
8ab38f6c	417
0002d5d2	418	template<typename _CharT>
105c6331 BK	419	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
105c6331 BK	420	istreambuf_iterator<_CharT> >::__type
0002d5d2	421	find(istreambuf_iterator<_CharT> __first,
976e25f4	422	istreambuf_iterator<_CharT> __last, const _CharT& __val)
0002d5d2	423	{
e324f9cb	424	typedef istreambuf_iterator<_CharT> __is_iterator_type;
0002d5d2 PC	425	typedef typename __is_iterator_type::traits_type traits_type;
0002d5d2 PC	426	typedef typename __is_iterator_type::streambuf_type streambuf_type;
e324f9cb	427	typedef typename traits_type::int_type int_type;
4e914524	428	const int_type __eof = traits_type::eof();
0002d5d2 PC	429
	430	if (__first._M_sbuf && !__last._M_sbuf)
	431	{
	432	const int_type __ival = traits_type::to_int_type(__val);
	433	streambuf_type* __sb = __first._M_sbuf;
	434	int_type __c = __sb->sgetc();
4e914524	435	while (!traits_type::eq_int_type(__c, __eof)
0002d5d2 PC	436	&& !traits_type::eq_int_type(__c, __ival))
	437	{
	438	streamsize __n = __sb->egptr() - __sb->gptr();
	439	if (__n > 1)
	440	{
	441	const _CharT* __p = traits_type::find(__sb->gptr(),
	442	__n, __val);
	443	if (__p)
	444	__n = __p - __sb->gptr();
1139a735	445	__sb->__safe_gbump(__n);
0002d5d2 PC	446	__c = __sb->sgetc();
	447	}
	448	else
	449	__c = __sb->snextc();
	450	}
	451
4e914524	452	__first._M_c = __eof;
0002d5d2	453	}
4e914524	454
0002d5d2 PC	455	return __first;
	456	}
	457
e324f9cb FD	458	template<typename _CharT, typename _Distance>
	459	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
	460	void>::__type
	461	advance(istreambuf_iterator<_CharT>& __i, _Distance __n)
	462	{
	463	if (__n == 0)
	464	return;
	465
	466	__glibcxx_assert(__n > 0);
	467	__glibcxx_requires_cond(!__i._M_at_eof(),
	468	_M_message(__gnu_debug::__msg_inc_istreambuf)
	469	._M_iterator(__i));
	470
	471	typedef istreambuf_iterator<_CharT> __is_iterator_type;
	472	typedef typename __is_iterator_type::traits_type traits_type;
	473	typedef typename __is_iterator_type::streambuf_type streambuf_type;
	474	typedef typename traits_type::int_type int_type;
	475	const int_type __eof = traits_type::eof();
	476
	477	streambuf_type* __sb = __i._M_sbuf;
	478	while (__n > 0)
	479	{
	480	streamsize __size = __sb->egptr() - __sb->gptr();
	481	if (__size > __n)
	482	{
	483	__sb->__safe_gbump(__n);
	484	break;
	485	}
	486
	487	__sb->__safe_gbump(__size);
	488	__n -= __size;
	489	if (traits_type::eq_int_type(__sb->underflow(), __eof))
	490	{
	491	__glibcxx_requires_cond(__n == 0,
	492	_M_message(__gnu_debug::__msg_inc_istreambuf)
	493	._M_iterator(__i));
	494	break;
	495	}
	496	}
	497
	498	__i._M_c = __eof;
	499	}
	500
8e32aa11 BK	501	// @} group iterators
8e32aa11 BK	502
12ffa228 BK	503	_GLIBCXX_END_NAMESPACE_VERSION
12ffa228 BK	504	} // namespace
3cbc7af0	505
b85381b9	506	#endif