You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
507 lines
15 KiB
507 lines
15 KiB
// 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
|