459 lines
14 KiB
C++
459 lines
14 KiB
C++
// Streambuf iterators
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// Copyright (C) 1997-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/streambuf_iterator.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{iterator}
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*/
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#ifndef _STREAMBUF_ITERATOR_H
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#define _STREAMBUF_ITERATOR_H 1
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#pragma GCC system_header
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#include <streambuf>
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#include <debug/debug.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @addtogroup iterators
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* @{
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*/
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// 24.5.3 Template class istreambuf_iterator
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/// Provides input iterator semantics for streambufs.
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template<typename _CharT, typename _Traits>
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class istreambuf_iterator
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: public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
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_CharT*,
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#if __cplusplus >= 201103L
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// LWG 445.
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_CharT>
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#else
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_CharT&>
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#endif
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{
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public:
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// Types:
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//@{
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/// Public typedefs
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef typename _Traits::int_type int_type;
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typedef basic_streambuf<_CharT, _Traits> streambuf_type;
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typedef basic_istream<_CharT, _Traits> istream_type;
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//@}
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template<typename _CharT2>
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
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ostreambuf_iterator<_CharT2> >::__type
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copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
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ostreambuf_iterator<_CharT2>);
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template<bool _IsMove, typename _CharT2>
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
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_CharT2*>::__type
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__copy_move_a2(istreambuf_iterator<_CharT2>,
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istreambuf_iterator<_CharT2>, _CharT2*);
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template<typename _CharT2>
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
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istreambuf_iterator<_CharT2> >::__type
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find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
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const _CharT2&);
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template<typename _CharT2, typename _Distance>
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
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void>::__type
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advance(istreambuf_iterator<_CharT2>&, _Distance);
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private:
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// 24.5.3 istreambuf_iterator
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// p 1
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// If the end of stream is reached (streambuf_type::sgetc()
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// returns traits_type::eof()), the iterator becomes equal to
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// the "end of stream" iterator value.
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// NB: This implementation assumes the "end of stream" value
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// is EOF, or -1.
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mutable streambuf_type* _M_sbuf;
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int_type _M_c;
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public:
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/// Construct end of input stream iterator.
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_GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT
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: _M_sbuf(0), _M_c(traits_type::eof()) { }
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#if __cplusplus >= 201103L
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istreambuf_iterator(const istreambuf_iterator&) noexcept = default;
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~istreambuf_iterator() = default;
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#endif
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/// Construct start of input stream iterator.
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istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT
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: _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
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/// Construct start of streambuf iterator.
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istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
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: _M_sbuf(__s), _M_c(traits_type::eof()) { }
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#if __cplusplus >= 201103L
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istreambuf_iterator&
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operator=(const istreambuf_iterator&) noexcept = default;
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#endif
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/// Return the current character pointed to by iterator. This returns
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/// streambuf.sgetc(). It cannot be assigned. NB: The result of
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/// operator*() on an end of stream is undefined.
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char_type
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operator*() const
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{
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int_type __c = _M_get();
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#ifdef _GLIBCXX_DEBUG_PEDANTIC
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// Dereferencing a past-the-end istreambuf_iterator is a
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// libstdc++ extension
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__glibcxx_requires_cond(!_S_is_eof(__c),
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_M_message(__gnu_debug::__msg_deref_istreambuf)
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._M_iterator(*this));
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#endif
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return traits_type::to_char_type(__c);
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}
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/// Advance the iterator. Calls streambuf.sbumpc().
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istreambuf_iterator&
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operator++()
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{
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__glibcxx_requires_cond(_M_sbuf &&
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(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
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_M_message(__gnu_debug::__msg_inc_istreambuf)
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._M_iterator(*this));
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_M_sbuf->sbumpc();
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_M_c = traits_type::eof();
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return *this;
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}
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/// Advance the iterator. Calls streambuf.sbumpc().
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istreambuf_iterator
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operator++(int)
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{
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__glibcxx_requires_cond(_M_sbuf &&
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(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
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_M_message(__gnu_debug::__msg_inc_istreambuf)
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._M_iterator(*this));
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istreambuf_iterator __old = *this;
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__old._M_c = _M_sbuf->sbumpc();
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_M_c = traits_type::eof();
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return __old;
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}
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 110 istreambuf_iterator::equal not const
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// NB: there is also number 111 (NAD) relevant to this function.
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/// Return true both iterators are end or both are not end.
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bool
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equal(const istreambuf_iterator& __b) const
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{ return _M_at_eof() == __b._M_at_eof(); }
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private:
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int_type
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_M_get() const
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{
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int_type __ret = _M_c;
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if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc()))
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_M_sbuf = 0;
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return __ret;
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}
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bool
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_M_at_eof() const
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{ return _S_is_eof(_M_get()); }
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static bool
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_S_is_eof(int_type __c)
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{
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const int_type __eof = traits_type::eof();
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return traits_type::eq_int_type(__c, __eof);
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}
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};
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template<typename _CharT, typename _Traits>
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inline bool
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operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
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const istreambuf_iterator<_CharT, _Traits>& __b)
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{ return __a.equal(__b); }
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template<typename _CharT, typename _Traits>
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inline bool
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operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
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const istreambuf_iterator<_CharT, _Traits>& __b)
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{ return !__a.equal(__b); }
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/// Provides output iterator semantics for streambufs.
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template<typename _CharT, typename _Traits>
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class ostreambuf_iterator
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: public iterator<output_iterator_tag, void, void, void, void>
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{
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public:
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// Types:
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//@{
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/// Public typedefs
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef basic_streambuf<_CharT, _Traits> streambuf_type;
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typedef basic_ostream<_CharT, _Traits> ostream_type;
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//@}
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template<typename _CharT2>
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
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ostreambuf_iterator<_CharT2> >::__type
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copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
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ostreambuf_iterator<_CharT2>);
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private:
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streambuf_type* _M_sbuf;
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bool _M_failed;
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public:
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/// Construct output iterator from ostream.
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ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT
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: _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
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/// Construct output iterator from streambuf.
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ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
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: _M_sbuf(__s), _M_failed(!_M_sbuf) { }
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/// Write character to streambuf. Calls streambuf.sputc().
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ostreambuf_iterator&
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operator=(_CharT __c)
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{
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if (!_M_failed &&
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_Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
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_M_failed = true;
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return *this;
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}
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/// Return *this.
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ostreambuf_iterator&
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operator*()
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{ return *this; }
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/// Return *this.
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ostreambuf_iterator&
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operator++(int)
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{ return *this; }
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/// Return *this.
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ostreambuf_iterator&
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operator++()
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{ return *this; }
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/// Return true if previous operator=() failed.
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bool
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failed() const _GLIBCXX_USE_NOEXCEPT
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{ return _M_failed; }
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ostreambuf_iterator&
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_M_put(const _CharT* __ws, streamsize __len)
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{
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if (__builtin_expect(!_M_failed, true)
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&& __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
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false))
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_M_failed = true;
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return *this;
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}
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};
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// Overloads for streambuf iterators.
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template<typename _CharT>
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
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ostreambuf_iterator<_CharT> >::__type
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copy(istreambuf_iterator<_CharT> __first,
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istreambuf_iterator<_CharT> __last,
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ostreambuf_iterator<_CharT> __result)
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{
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if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)
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{
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bool __ineof;
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__copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);
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if (!__ineof)
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__result._M_failed = true;
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}
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return __result;
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}
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template<bool _IsMove, typename _CharT>
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
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ostreambuf_iterator<_CharT> >::__type
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__copy_move_a2(_CharT* __first, _CharT* __last,
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ostreambuf_iterator<_CharT> __result)
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{
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const streamsize __num = __last - __first;
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if (__num > 0)
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__result._M_put(__first, __num);
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return __result;
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}
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template<bool _IsMove, typename _CharT>
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
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ostreambuf_iterator<_CharT> >::__type
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__copy_move_a2(const _CharT* __first, const _CharT* __last,
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ostreambuf_iterator<_CharT> __result)
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{
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const streamsize __num = __last - __first;
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if (__num > 0)
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__result._M_put(__first, __num);
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return __result;
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}
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template<bool _IsMove, typename _CharT>
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
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_CharT*>::__type
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__copy_move_a2(istreambuf_iterator<_CharT> __first,
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istreambuf_iterator<_CharT> __last, _CharT* __result)
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{
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typedef istreambuf_iterator<_CharT> __is_iterator_type;
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typedef typename __is_iterator_type::traits_type traits_type;
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typedef typename __is_iterator_type::streambuf_type streambuf_type;
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typedef typename traits_type::int_type int_type;
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if (__first._M_sbuf && !__last._M_sbuf)
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{
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streambuf_type* __sb = __first._M_sbuf;
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int_type __c = __sb->sgetc();
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while (!traits_type::eq_int_type(__c, traits_type::eof()))
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{
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const streamsize __n = __sb->egptr() - __sb->gptr();
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if (__n > 1)
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{
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traits_type::copy(__result, __sb->gptr(), __n);
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__sb->__safe_gbump(__n);
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__result += __n;
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__c = __sb->underflow();
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}
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else
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{
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*__result++ = traits_type::to_char_type(__c);
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__c = __sb->snextc();
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}
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}
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}
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return __result;
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}
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template<typename _CharT>
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
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istreambuf_iterator<_CharT> >::__type
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find(istreambuf_iterator<_CharT> __first,
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istreambuf_iterator<_CharT> __last, const _CharT& __val)
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{
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typedef istreambuf_iterator<_CharT> __is_iterator_type;
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typedef typename __is_iterator_type::traits_type traits_type;
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typedef typename __is_iterator_type::streambuf_type streambuf_type;
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typedef typename traits_type::int_type int_type;
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const int_type __eof = traits_type::eof();
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if (__first._M_sbuf && !__last._M_sbuf)
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{
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const int_type __ival = traits_type::to_int_type(__val);
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streambuf_type* __sb = __first._M_sbuf;
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int_type __c = __sb->sgetc();
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while (!traits_type::eq_int_type(__c, __eof)
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&& !traits_type::eq_int_type(__c, __ival))
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{
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streamsize __n = __sb->egptr() - __sb->gptr();
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if (__n > 1)
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{
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const _CharT* __p = traits_type::find(__sb->gptr(),
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__n, __val);
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if (__p)
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__n = __p - __sb->gptr();
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__sb->__safe_gbump(__n);
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__c = __sb->sgetc();
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}
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else
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__c = __sb->snextc();
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}
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__first._M_c = __eof;
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}
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return __first;
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}
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template<typename _CharT, typename _Distance>
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
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void>::__type
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advance(istreambuf_iterator<_CharT>& __i, _Distance __n)
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{
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if (__n == 0)
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return;
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__glibcxx_assert(__n > 0);
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__glibcxx_requires_cond(!__i._M_at_eof(),
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_M_message(__gnu_debug::__msg_inc_istreambuf)
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._M_iterator(__i));
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typedef istreambuf_iterator<_CharT> __is_iterator_type;
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typedef typename __is_iterator_type::traits_type traits_type;
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typedef typename __is_iterator_type::streambuf_type streambuf_type;
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typedef typename traits_type::int_type int_type;
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const int_type __eof = traits_type::eof();
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streambuf_type* __sb = __i._M_sbuf;
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while (__n > 0)
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{
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streamsize __size = __sb->egptr() - __sb->gptr();
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if (__size > __n)
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{
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__sb->__safe_gbump(__n);
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break;
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}
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__sb->__safe_gbump(__size);
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__n -= __size;
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if (traits_type::eq_int_type(__sb->underflow(), __eof))
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{
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__glibcxx_requires_cond(__n == 0,
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_M_message(__gnu_debug::__msg_inc_istreambuf)
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._M_iterator(__i));
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break;
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}
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}
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__i._M_c = __eof;
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}
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// @} group iterators
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif
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