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gcc/libstdc++-v3/include/bits/istream.tcc
Jonathan Wakely b32eea9c0c libstdc++: Fix istream::ignore discarding too many chars (PR 94749) 
The current code assumes that if the next character in the stream is
equal to the delimiter then we stopped because we saw that delimiter,
and so discards it.  But in the testcase for the PR we stop because we
reached the maximum number of characters, and it's coincidence that the
next character equals the delimiter. We should not discard the next
character in that case.

The fix is to check that we haven't discarded __n characters already,
instead of checking whether the next character equals __delim. Because
we've already checked for EOF, if we haven't discarded __n yet then we
know we stopped because we saw the delimiter. On the other hand, if the
next character is the delimiter we don't know if that's why we stopped.

	PR libstdc++/94749
	* include/bits/istream.tcc (basic_istream::ignore(streamsize, CharT)):
	Only discard an extra character if we didn't already reach the
	maximum number.
	* src/c++98/istream.cc (istream::ignore(streamsiz, char))
	(wistream::ignore(streamsize, wchar_t)): Likewise.
	* testsuite/27_io/basic_istream/ignore/char/94749.cc: New test.
	* testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc: New test.
2020-06-11 18:41:37 +01:00

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// istream classes -*- C++ -*-
// Copyright (C) 1997-2020 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);
while (!traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __idelim)
&& !traits_type::eq_int_type(__sb.sputc(__c2), __eof))
{
++_M_gcount;
__c = __this_sb->snextc();
__c2 = traits_type::to_char_type(__c);
}
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 (!_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 (__large_ignore)
_M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
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 (__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) // implies __c == __delim
{
++_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>
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
{
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 __num = __in.width();
if (__num <= 0)
__num = __gnu_cxx::__numeric_traits<streamsize>::__max;
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 (_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);
return __in;
}
// 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&, char*);
extern template istream& operator>>(istream&, unsigned char&);
extern template istream& operator>>(istream&, signed 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 wistream& operator>>(wistream&, wchar_t*);
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
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