istream.tcc
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// istream classes -*- C++ -*-
// 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/istream.tcc
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{istream}
*/
//
// ISO C++ 14882: 27.6.1 Input streams
//
#ifndef _ISTREAM_TCC
#define _ISTREAM_TCC 1
#pragma GCC system_header
#include <bits/cxxabi_forced.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>::sentry::
sentry(basic_istream<_CharT, _Traits>& __in, bool __noskip) : _M_ok(false)
{
ios_base::iostate __err = ios_base::goodbit;
if (__in.good())
__try
{
if (__in.tie())
__in.tie()->flush();
if (!__noskip && bool(__in.flags() & ios_base::skipws))
{
const __int_type __eof = traits_type::eof();
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sgetc();
const __ctype_type& __ct = __check_facet(__in._M_ctype);
while (!traits_type::eq_int_type(__c, __eof)
&& __ct.is(ctype_base::space,
traits_type::to_char_type(__c)))
__c = __sb->snextc();
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 195. Should basic_istream::sentry's constructor ever
// set eofbit?
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
}
}
__catch(__cxxabiv1::__forced_unwind&)
{
__in._M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ __in._M_setstate(ios_base::badbit); }
if (__in.good() && __err == ios_base::goodbit)
_M_ok = true;
else
{
__err |= ios_base::failbit;
__in.setstate(__err);
}
}
template<typename _CharT, typename _Traits>
template<typename _ValueT>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
_M_extract(_ValueT& __v)
{
sentry __cerb(*this, false);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
const __num_get_type& __ng = __check_facet(this->_M_num_get);
__ng.get(*this, 0, *this, __err, __v);
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(short& __n)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 118. basic_istream uses nonexistent num_get member functions.
sentry __cerb(*this, false);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
long __l;
const __num_get_type& __ng = __check_facet(this->_M_num_get);
__ng.get(*this, 0, *this, __err, __l);
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 696. istream::operator>>(int&) broken.
if (__l < __gnu_cxx::__numeric_traits<short>::__min)
{
__err |= ios_base::failbit;
__n = __gnu_cxx::__numeric_traits<short>::__min;
}
else if (__l > __gnu_cxx::__numeric_traits<short>::__max)
{
__err |= ios_base::failbit;
__n = __gnu_cxx::__numeric_traits<short>::__max;
}
else
__n = short(__l);
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(int& __n)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 118. basic_istream uses nonexistent num_get member functions.
sentry __cerb(*this, false);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
long __l;
const __num_get_type& __ng = __check_facet(this->_M_num_get);
__ng.get(*this, 0, *this, __err, __l);
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 696. istream::operator>>(int&) broken.
if (__l < __gnu_cxx::__numeric_traits<int>::__min)
{
__err |= ios_base::failbit;
__n = __gnu_cxx::__numeric_traits<int>::__min;
}
else if (__l > __gnu_cxx::__numeric_traits<int>::__max)
{
__err |= ios_base::failbit;
__n = __gnu_cxx::__numeric_traits<int>::__max;
}
else
__n = int(__l);
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(__streambuf_type* __sbout)
{
ios_base::iostate __err = ios_base::goodbit;
sentry __cerb(*this, false);
if (__cerb && __sbout)
{
__try
{
bool __ineof;
if (!__copy_streambufs_eof(this->rdbuf(), __sbout, __ineof))
__err |= ios_base::failbit;
if (__ineof)
__err |= ios_base::eofbit;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::failbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::failbit); }
}
else if (!__sbout)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
template<typename _CharT, typename _Traits>
typename basic_istream<_CharT, _Traits>::int_type
basic_istream<_CharT, _Traits>::
get(void)
{
const int_type __eof = traits_type::eof();
int_type __c = __eof;
_M_gcount = 0;
ios_base::iostate __err = ios_base::goodbit;
sentry __cerb(*this, true);
if (__cerb)
{
__try
{
__c = this->rdbuf()->sbumpc();
// 27.6.1.1 paragraph 3
if (!traits_type::eq_int_type(__c, __eof))
_M_gcount = 1;
else
__err |= ios_base::eofbit;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return __c;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
get(char_type& __c)
{
_M_gcount = 0;
ios_base::iostate __err = ios_base::goodbit;
sentry __cerb(*this, true);
if (__cerb)
{
__try
{
const int_type __cb = this->rdbuf()->sbumpc();
// 27.6.1.1 paragraph 3
if (!traits_type::eq_int_type(__cb, traits_type::eof()))
{
_M_gcount = 1;
__c = traits_type::to_char_type(__cb);
}
else
__err |= ios_base::eofbit;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
get(char_type* __s, streamsize __n, char_type __delim)
{
_M_gcount = 0;
ios_base::iostate __err = ios_base::goodbit;
sentry __cerb(*this, true);
if (__cerb)
{
__try
{
const int_type __idelim = traits_type::to_int_type(__delim);
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
int_type __c = __sb->sgetc();
while (_M_gcount + 1 < __n
&& !traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __idelim))
{
*__s++ = traits_type::to_char_type(__c);
++_M_gcount;
__c = __sb->snextc();
}
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 243. get and getline when sentry reports failure.
if (__n > 0)
*__s = char_type();
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
get(__streambuf_type& __sb, char_type __delim)
{
_M_gcount = 0;
ios_base::iostate __err = ios_base::goodbit;
sentry __cerb(*this, true);
if (__cerb)
{
__try
{
const int_type __idelim = traits_type::to_int_type(__delim);
const int_type __eof = traits_type::eof();
__streambuf_type* __this_sb = this->rdbuf();
int_type __c = __this_sb->sgetc();
char_type __c2 = traits_type::to_char_type(__c);
unsigned long long __gcount = 0;
while (!traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __idelim)
&& !traits_type::eq_int_type(__sb.sputc(__c2), __eof))
{
++__gcount;
__c = __this_sb->snextc();
__c2 = traits_type::to_char_type(__c);
}
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 3464. istream::gcount() can overflow
if (__gcount <= __gnu_cxx::__numeric_traits<streamsize>::__max)
_M_gcount = __gcount;
else
_M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
getline(char_type* __s, streamsize __n, char_type __delim)
{
_M_gcount = 0;
ios_base::iostate __err = ios_base::goodbit;
sentry __cerb(*this, true);
if (__cerb)
{
__try
{
const int_type __idelim = traits_type::to_int_type(__delim);
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
int_type __c = __sb->sgetc();
while (_M_gcount + 1 < __n
&& !traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __idelim))
{
*__s++ = traits_type::to_char_type(__c);
__c = __sb->snextc();
++_M_gcount;
}
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
else
{
if (traits_type::eq_int_type(__c, __idelim))
{
__sb->sbumpc();
++_M_gcount;
}
else
__err |= ios_base::failbit;
}
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 243. get and getline when sentry reports failure.
if (__n > 0)
*__s = char_type();
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
// We provide three overloads, since the first two are much simpler
// than the general case. Also, the latter two can thus adopt the
// same "batchy" strategy used by getline above.
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
ignore(void)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
if (traits_type::eq_int_type(__sb->sbumpc(), __eof))
__err |= ios_base::eofbit;
else
_M_gcount = 1;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
ignore(streamsize __n)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb && __n > 0)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
int_type __c = __sb->sgetc();
// N.B. On LFS-enabled platforms streamsize is still 32 bits
// wide: if we want to implement the standard mandated behavior
// for n == max() (see 27.6.1.3/24) we are at risk of signed
// integer overflow: thus these contortions. Also note that,
// by definition, when more than 2G chars are actually ignored,
// _M_gcount (the return value of gcount, that is) cannot be
// really correct, being unavoidably too small.
bool __large_ignore = false;
while (true)
{
while (_M_gcount < __n
&& !traits_type::eq_int_type(__c, __eof))
{
++_M_gcount;
__c = __sb->snextc();
}
if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
&& !traits_type::eq_int_type(__c, __eof))
{
_M_gcount =
__gnu_cxx::__numeric_traits<streamsize>::__min;
__large_ignore = true;
}
else
break;
}
if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max)
{
if (__large_ignore)
_M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
}
else if (_M_gcount < __n)
{
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
}
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
ignore(streamsize __n, int_type __delim)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb && __n > 0)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
int_type __c = __sb->sgetc();
// See comment above.
bool __large_ignore = false;
while (true)
{
while (_M_gcount < __n
&& !traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __delim))
{
++_M_gcount;
__c = __sb->snextc();
}
if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
&& !traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __delim))
{
_M_gcount =
__gnu_cxx::__numeric_traits<streamsize>::__min;
__large_ignore = true;
}
else
break;
}
if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max)
{
if (__large_ignore)
_M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
else
{
if (_M_gcount != __n)
++_M_gcount;
__sb->sbumpc();
}
}
else if (_M_gcount < __n) // implies __c == __delim or EOF
{
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
else
{
++_M_gcount;
__sb->sbumpc();
}
}
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
typename basic_istream<_CharT, _Traits>::int_type
basic_istream<_CharT, _Traits>::
peek(void)
{
int_type __c = traits_type::eof();
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
__c = this->rdbuf()->sgetc();
if (traits_type::eq_int_type(__c, traits_type::eof()))
__err |= ios_base::eofbit;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return __c;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
read(char_type* __s, streamsize __n)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
_M_gcount = this->rdbuf()->sgetn(__s, __n);
if (_M_gcount != __n)
__err |= (ios_base::eofbit | ios_base::failbit);
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
streamsize
basic_istream<_CharT, _Traits>::
readsome(char_type* __s, streamsize __n)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
// Cannot compare int_type with streamsize generically.
const streamsize __num = this->rdbuf()->in_avail();
if (__num > 0)
_M_gcount = this->rdbuf()->sgetn(__s, std::min(__num, __n));
else if (__num == -1)
__err |= ios_base::eofbit;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return _M_gcount;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
putback(char_type __c)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 60. What is a formatted input function?
_M_gcount = 0;
// Clear eofbit per N3168.
this->clear(this->rdstate() & ~ios_base::eofbit);
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
if (!__sb
|| traits_type::eq_int_type(__sb->sputbackc(__c), __eof))
__err |= ios_base::badbit;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
unget(void)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 60. What is a formatted input function?
_M_gcount = 0;
// Clear eofbit per N3168.
this->clear(this->rdstate() & ~ios_base::eofbit);
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
if (!__sb
|| traits_type::eq_int_type(__sb->sungetc(), __eof))
__err |= ios_base::badbit;
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
int
basic_istream<_CharT, _Traits>::
sync(void)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR60. Do not change _M_gcount.
int __ret = -1;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
__streambuf_type* __sb = this->rdbuf();
if (__sb)
{
if (__sb->pubsync() == -1)
__err |= ios_base::badbit;
else
__ret = 0;
}
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return __ret;
}
template<typename _CharT, typename _Traits>
typename basic_istream<_CharT, _Traits>::pos_type
basic_istream<_CharT, _Traits>::
tellg(void)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR60. Do not change _M_gcount.
pos_type __ret = pos_type(-1);
sentry __cerb(*this, true);
if (__cerb)
{
__try
{
if (!this->fail())
__ret = this->rdbuf()->pubseekoff(0, ios_base::cur,
ios_base::in);
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
return __ret;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
seekg(pos_type __pos)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR60. Do not change _M_gcount.
// Clear eofbit per N3168.
this->clear(this->rdstate() & ~ios_base::eofbit);
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
if (!this->fail())
{
// 136. seekp, seekg setting wrong streams?
const pos_type __p = this->rdbuf()->pubseekpos(__pos,
ios_base::in);
// 129. Need error indication from seekp() and seekg()
if (__p == pos_type(off_type(-1)))
__err |= ios_base::failbit;
}
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
seekg(off_type __off, ios_base::seekdir __dir)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR60. Do not change _M_gcount.
// Clear eofbit per N3168.
this->clear(this->rdstate() & ~ios_base::eofbit);
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
if (!this->fail())
{
// 136. seekp, seekg setting wrong streams?
const pos_type __p = this->rdbuf()->pubseekoff(__off, __dir,
ios_base::in);
// 129. Need error indication from seekp() and seekg()
if (__p == pos_type(off_type(-1)))
__err |= ios_base::failbit;
}
}
__catch(__cxxabiv1::__forced_unwind&)
{
this->_M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
// 27.6.1.2.3 Character extraction templates
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::int_type __int_type;
typename __istream_type::sentry __cerb(__in, false);
if (__cerb)
{
ios_base::iostate __err = ios_base::goodbit;
__try
{
const __int_type __cb = __in.rdbuf()->sbumpc();
if (!_Traits::eq_int_type(__cb, _Traits::eof()))
__c = _Traits::to_char_type(__cb);
else
__err |= (ios_base::eofbit | ios_base::failbit);
}
__catch(__cxxabiv1::__forced_unwind&)
{
__in._M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ __in._M_setstate(ios_base::badbit); }
if (__err)
__in.setstate(__err);
}
return __in;
}
template<typename _CharT, typename _Traits>
void
__istream_extract(basic_istream<_CharT, _Traits>& __in, _CharT* __s,
streamsize __num)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
typedef typename _Traits::int_type int_type;
typedef _CharT char_type;
typedef ctype<_CharT> __ctype_type;
streamsize __extracted = 0;
ios_base::iostate __err = ios_base::goodbit;
typename __istream_type::sentry __cerb(__in, false);
if (__cerb)
{
__try
{
// Figure out how many characters to extract.
streamsize __width = __in.width();
if (0 < __width && __width < __num)
__num = __width;
const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
const int_type __eof = _Traits::eof();
__streambuf_type* __sb = __in.rdbuf();
int_type __c = __sb->sgetc();
while (__extracted < __num - 1
&& !_Traits::eq_int_type(__c, __eof)
&& !__ct.is(ctype_base::space,
_Traits::to_char_type(__c)))
{
*__s++ = _Traits::to_char_type(__c);
++__extracted;
__c = __sb->snextc();
}
if (__extracted < __num - 1
&& _Traits::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 68. Extractors for char* should store null at end
*__s = char_type();
__in.width(0);
}
__catch(__cxxabiv1::__forced_unwind&)
{
__in._M_setstate(ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ __in._M_setstate(ios_base::badbit); }
}
if (!__extracted)
__err |= ios_base::failbit;
if (__err)
__in.setstate(__err);
}
// 27.6.1.4 Standard basic_istream manipulators
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
ws(basic_istream<_CharT, _Traits>& __in)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
typedef typename __istream_type::int_type __int_type;
typedef ctype<_CharT> __ctype_type;
const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
const __int_type __eof = _Traits::eof();
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sgetc();
while (!_Traits::eq_int_type(__c, __eof)
&& __ct.is(ctype_base::space, _Traits::to_char_type(__c)))
__c = __sb->snextc();
if (_Traits::eq_int_type(__c, __eof))
__in.setstate(ios_base::eofbit);
return __in;
}
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
#if _GLIBCXX_EXTERN_TEMPLATE
extern template class basic_istream<char>;
extern template istream& ws(istream&);
extern template istream& operator>>(istream&, char&);
extern template istream& operator>>(istream&, unsigned char&);
extern template istream& operator>>(istream&, signed char&);
extern template istream& istream::_M_extract(unsigned short&);
extern template istream& istream::_M_extract(unsigned int&);
extern template istream& istream::_M_extract(long&);
extern template istream& istream::_M_extract(unsigned long&);
extern template istream& istream::_M_extract(bool&);
#ifdef _GLIBCXX_USE_LONG_LONG
extern template istream& istream::_M_extract(long long&);
extern template istream& istream::_M_extract(unsigned long long&);
#endif
extern template istream& istream::_M_extract(float&);
extern template istream& istream::_M_extract(double&);
extern template istream& istream::_M_extract(long double&);
extern template istream& istream::_M_extract(void*&);
extern template class basic_iostream<char>;
#ifdef _GLIBCXX_USE_WCHAR_T
extern template class basic_istream<wchar_t>;
extern template wistream& ws(wistream&);
extern template wistream& operator>>(wistream&, wchar_t&);
extern template void __istream_extract(wistream&, wchar_t*, streamsize);
extern template wistream& wistream::_M_extract(unsigned short&);
extern template wistream& wistream::_M_extract(unsigned int&);
extern template wistream& wistream::_M_extract(long&);
extern template wistream& wistream::_M_extract(unsigned long&);
extern template wistream& wistream::_M_extract(bool&);
#ifdef _GLIBCXX_USE_LONG_LONG
extern template wistream& wistream::_M_extract(long long&);
extern template wistream& wistream::_M_extract(unsigned long long&);
#endif
extern template wistream& wistream::_M_extract(float&);
extern template wistream& wistream::_M_extract(double&);
extern template wistream& wistream::_M_extract(long double&);
extern template wistream& wistream::_M_extract(void*&);
extern template class basic_iostream<wchar_t>;
#endif
#endif
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif
cxxabi_forced.h
std::istream
basic_istream< char > istream
Base class for char input streams.
Definition: iosfwd:138
std::wistream
basic_istream< wchar_t > wistream
Base class for wchar_t input streams.
Definition: iosfwd:178
std::min
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:230
std
ISO C++ entities toplevel namespace is std.
std::streamsize
ptrdiff_t streamsize
Integral type for I/O operation counts and buffer sizes.
Definition: postypes.h:98
std::ws
basic_istream< _CharT, _Traits > & ws(basic_istream< _CharT, _Traits > &__is)
Quick and easy way to eat whitespace.
Definition: istream.tcc:1053
std::basic_ios::clear
void clear(iostate __state=goodbit)
[Re]sets the error state.
Definition: basic_ios.tcc:41
std::basic_ios::tie
basic_ostream< _CharT, _Traits > * tie() const
Fetches the current tied stream.
Definition: basic_ios.h:295
std::basic_ios::rdbuf
basic_streambuf< _CharT, _Traits > * rdbuf() const
Accessing the underlying buffer.
Definition: basic_ios.h:321
std::basic_ios::setstate
void setstate(iostate __state)
Sets additional flags in the error state.
Definition: basic_ios.h:157
std::basic_ios::rdstate
iostate rdstate() const
Returns the error state of the stream buffer.
Definition: basic_ios.h:137
std::basic_ios::good
bool good() const
Fast error checking.
Definition: basic_ios.h:180
std::basic_ios::fail
bool fail() const
Fast error checking.
Definition: basic_ios.h:201
std::basic_ios< char, _Traits >::char_type
char char_type
Definition: basic_ios.h:76
std::basic_ios< char, _Traits >::int_type
_Traits::int_type int_type
Definition: basic_ios.h:77
std::basic_streambuf
The actual work of input and output (interface).
Definition: streambuf:123
std::basic_streambuf::snextc
int_type snextc()
Getting the next character.
Definition: streambuf:303
std::basic_streambuf::sbumpc
int_type sbumpc()
Getting the next character.
Definition: streambuf:321
std::basic_streambuf::sungetc
int_type sungetc()
Moving backwards in the input stream.
Definition: streambuf:402
std::basic_streambuf::sgetc
int_type sgetc()
Getting the next character.
Definition: streambuf:343
std::basic_streambuf::pubsync
int pubsync()
Calls virtual sync function.
Definition: streambuf:276
std::basic_streambuf::sputbackc
int_type sputbackc(char_type __c)
Pushing characters back into the input stream.
Definition: streambuf:377
std::basic_streambuf::sputc
int_type sputc(char_type __c)
Entry point for all single-character output functions.
Definition: streambuf:429
std::basic_istream
Template class basic_istream.
Definition: istream:59
std::basic_istream::seekg
__istream_type & seekg(pos_type)
Changing the current read position.
Definition: istream.tcc:880
std::basic_istream::get
int_type get()
Simple extraction.
Definition: istream.tcc:244
std::basic_istream::readsome
streamsize readsome(char_type *__s, streamsize __n)
Extraction until the buffer is exhausted, but no more.
Definition: istream.tcc:714
std::basic_istream::peek
int_type peek()
Looking ahead in the stream.
Definition: istream.tcc:655
std::basic_istream::unget
__istream_type & unget()
Unextracting the previous character.
Definition: istream.tcc:781
std::basic_istream::tellg
pos_type tellg()
Getting the current read position.
Definition: istream.tcc:852
std::basic_istream::_M_gcount
streamsize _M_gcount
Definition: istream:82
std::basic_istream::ignore
__istream_type & ignore()
Simple extraction.
Definition: istream.tcc:475
std::basic_istream::read
__istream_type & read(char_type *__s, streamsize __n)
Extraction without delimiters.
Definition: istream.tcc:685
std::basic_istream::putback
__istream_type & putback(char_type __c)
Unextracting a single character.
Definition: istream.tcc:746
std::basic_istream::getline
__istream_type & getline(char_type *__s, streamsize __n, char_type __delim)
String extraction.
Definition: istream.tcc:415
std::basic_istream::sync
int sync()
Synchronizing the stream buffer.
Definition: istream.tcc:816
std::basic_istream::operator>>
__istream_type & operator>>(__istream_type &(*__pf)(__istream_type &))
Interface for manipulators.
Definition: istream:120
std::basic_istream::sentry
Performs setup work for input streams.
Definition: istream:687
std::basic_istream::sentry::sentry
sentry(basic_istream< _CharT, _Traits > &__is, bool __noskipws=false)
The constructor performs all the work.
Definition: istream.tcc:47
__cxxabiv1::__forced_unwind
Thrown as part of forced unwinding.
Definition: cxxabi_forced.h:49
std::ios_base::skipws
static const fmtflags skipws
Skips leading white space before certain input operations.
Definition: ios_base.h:386
std::ios_base::iostate
_Ios_Iostate iostate
This is a bitmask type.
Definition: ios_base.h:416
std::ios_base::cur
static const seekdir cur
Request a seek relative to the current position within the sequence.
Definition: ios_base.h:485
std::ios_base::in
static const openmode in
Open for input. Default for ifstream and fstream.
Definition: ios_base.h:461
std::ios_base::flags
fmtflags flags() const
Access to format flags.
Definition: ios_base.h:649
std::ios_base::eofbit
static const iostate eofbit
Indicates that an input operation reached the end of an input sequence.
Definition: ios_base.h:423
std::ios_base::goodbit
static const iostate goodbit
Indicates all is well.
Definition: ios_base.h:431
std::ios_base::badbit
static const iostate badbit
Indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error fro...
Definition: ios_base.h:420
std::ios_base::getloc
locale getloc() const
Locale access.
Definition: ios_base.h:793
std::ios_base::failbit
static const iostate failbit
Indicates that an input operation failed to read the expected characters, or that an output operation...
Definition: ios_base.h:428
std::__ctype_abstract_base::is
bool is(mask __m, char_type __c) const
Test char_type classification.
Definition: locale_facets.h:172
std::ctype
Primary class template ctype facet.
Definition: locale_facets.h:616
std::num_get
Primary class template num_get.
Definition: locale_facets.h:1956
std::num_get::get
iter_type get(iter_type __in, iter_type __end, ios_base &__io, ios_base::iostate &__err, bool &__v) const
Numeric parsing.
Definition: locale_facets.h:2002