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gcc/libstdc++-v3/include/bits/istream.tcc
Danny Smith a2554733cc istream.tcc (basic_istream::ignore): Use sbumpc, not snextc. 
2002-08-08  Danny Smith  <dannysmith@users.sourceforge.net>
            Benjamin Kosnik  <bkoz@redhat.com>

	* include/bits/istream.tcc (basic_istream::ignore): Use sbumpc,
	not snextc.

Co-Authored-By: Benjamin Kosnik <bkoz@redhat.com>

From-SVN: r56153
2002-08-09 06:00:18 +00:00

1242 lines
34 KiB
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// istream classes -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
// 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 2, 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// ISO C++ 14882: 27.6.2 Output streams
//
#pragma GCC system_header
#include <locale>
#include <ostream> // For flush()
namespace std
{
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>::sentry::
sentry(basic_istream<_CharT, _Traits>& __in, bool __noskipws)
{
if (__in.good())
{
if (__in.tie())
__in.tie()->flush();
if (!__noskipws && (__in.flags() & ios_base::skipws))
{
const __int_type __eof = traits_type::eof();
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sgetc();
if (__in._M_check_facet(__in._M_fctype))
while (!traits_type::eq_int_type(__c, __eof)
&& __in._M_fctype->is(ctype_base::space,
traits_type::to_char_type(__c)))
__c = __sb->snextc();
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
//195. Should basic_istream::sentry's constructor ever set eofbit?
if (traits_type::eq_int_type(__c, __eof))
__in.setstate(ios_base::eofbit);
#endif
}
}
if (__in.good())
_M_ok = true;
else
{
_M_ok = false;
__in.setstate(ios_base::failbit);
}
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(__istream_type& (*__pf)(__istream_type&))
{
__pf(*this);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(__ios_type& (*__pf)(__ios_type&))
{
__pf(*this);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(ios_base& (*__pf)(ios_base&))
{
__pf(*this);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(bool& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(short& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
long __l;
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __l);
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 118. basic_istream uses nonexistent num_get member functions.
if (!(__err & ios_base::failbit)
&& (numeric_limits<short>::min() <= __l
&& __l <= numeric_limits<short>::max()))
__n = __l;
else
__err |= ios_base::failbit;
#endif
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(unsigned short& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(int& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
long __l;
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __l);
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 118. basic_istream uses nonexistent num_get member functions.
if (!(__err & ios_base::failbit)
&& (numeric_limits<int>::min() <= __l
&& __l <= numeric_limits<int>::max()))
__n = __l;
else
__err |= ios_base::failbit;
#endif
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(unsigned int& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(long& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(unsigned long& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
#ifdef _GLIBCPP_USE_LONG_LONG
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(long long& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(unsigned long long& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
#endif
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(float& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(double& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(long double& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(void*& __n)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (_M_check_facet(_M_fnumget))
_M_fnumget->get(*this, 0, *this, __err, __n);
this->setstate(__err);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(__streambuf_type* __sbout)
{
sentry __cerb(*this, false);
if (__cerb)
{
try
{
streamsize __xtrct = 0;
if (__sbout)
{
__streambuf_type* __sbin = this->rdbuf();
__xtrct = __copy_streambufs(*this, __sbin, __sbout);
}
if (!__sbout || !__xtrct)
this->setstate(ios_base::failbit);
}
catch(exception& __fail)
{
// 27.6.2.5.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
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;
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
this->setstate(ios_base::eofbit | ios_base::failbit);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return __c;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
get(char_type& __c)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
try
{
const int_type __eof = traits_type::eof();
int_type __bufval = this->rdbuf()->sbumpc();
// 27.6.1.1 paragraph 3
if (!traits_type::eq_int_type(__bufval, __eof))
{
_M_gcount = 1;
__c = traits_type::to_char_type(__bufval);
}
else
this->setstate(ios_base::eofbit | ios_base::failbit);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
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;
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))
this->setstate(ios_base::eofbit);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
*__s = char_type();
if (!_M_gcount)
this->setstate(ios_base::failbit);
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;
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))
this->setstate(ios_base::eofbit);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
if (!_M_gcount)
this->setstate(ios_base::failbit);
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;
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))
this->setstate(ios_base::eofbit);
else
{
if (traits_type::eq_int_type(__c, __idelim))
{
__sb->sbumpc();
++_M_gcount;
}
else
this->setstate(ios_base::failbit);
}
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
*__s = char_type();
if (!_M_gcount)
this->setstate(ios_base::failbit);
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)
{
try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
int_type __c;
__n = min(__n, numeric_limits<streamsize>::max());
while (_M_gcount < __n
&& !traits_type::eq_int_type(__c = __sb->sbumpc(), __eof))
{
++_M_gcount;
if (traits_type::eq_int_type(__c, __delim))
break;
}
if (traits_type::eq_int_type(__c, __eof))
this->setstate(ios_base::eofbit);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
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)
{
try
{ __c = this->rdbuf()->sgetc(); }
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
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)
{
try
{
_M_gcount = this->rdbuf()->sgetn(__s, __n);
if (_M_gcount != __n)
this->setstate(ios_base::eofbit | ios_base::failbit);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
else
this->setstate(ios_base::failbit);
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)
{
try
{
streamsize __num = this->rdbuf()->in_avail();
if (__num > 0)
{
__num = min(__num, __n);
if (__num)
_M_gcount = this->rdbuf()->sgetn(__s, __num);
}
else
this->setstate(ios_base::eofbit);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
else
this->setstate(ios_base::failbit);
return _M_gcount;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
putback(char_type __c)
{
sentry __cerb(*this, true);
if (__cerb)
{
try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
if (!__sb
|| traits_type::eq_int_type(__sb->sputbackc(__c), __eof))
this->setstate(ios_base::badbit);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
else
this->setstate(ios_base::failbit);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
unget(void)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
if (!__sb
|| traits_type::eq_int_type(__sb->sungetc(), __eof))
this->setstate(ios_base::badbit);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
else
this->setstate(ios_base::failbit);
return *this;
}
template<typename _CharT, typename _Traits>
int
basic_istream<_CharT, _Traits>::
sync(void)
{
int __ret = -1;
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
try
{
__streambuf_type* __sb = this->rdbuf();
if (__sb)
{
if (__sb->pubsync() == -1)
this->setstate(ios_base::badbit);
else
__ret = 0;
}
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return __ret;
}
template<typename _CharT, typename _Traits>
typename basic_istream<_CharT, _Traits>::pos_type
basic_istream<_CharT, _Traits>::
tellg(void)
{
pos_type __ret = pos_type(-1);
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
try
{
__ret = this->rdbuf()->pubseekoff(0, ios_base::cur, ios_base::in);
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return __ret;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
seekg(pos_type __pos)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
try
{
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 136. seekp, seekg setting wrong streams?
pos_type __err = this->rdbuf()->pubseekpos(__pos, ios_base::in);
// 129. Need error indication from seekp() and seekg()
if (__err == pos_type(off_type(-1)))
this->setstate(ios_base::failbit);
#endif
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
seekg(off_type __off, ios_base::seekdir __dir)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
try
{
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 136. seekp, seekg setting wrong streams?
pos_type __err = this->rdbuf()->pubseekoff(__off, __dir,
ios_base::in);
// 129. Need error indication from seekp() and seekg()
if (__err == pos_type(off_type(-1)))
this->setstate(ios_base::failbit);
#endif
}
catch(exception& __fail)
{
// 27.6.1.3 paragraph 1
// Turn this on without causing an ios::failure to be thrown.
this->setstate(ios_base::badbit);
if ((this->exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
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;
typename __istream_type::sentry __cerb(__in, false);
if (__cerb)
{
try
{ __in.get(__c); }
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
__in.setstate(ios_base::badbit);
if ((__in.exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
else
__in.setstate(ios_base::failbit);
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 typename __istream_type::__streambuf_type __streambuf_type;
typedef typename _Traits::int_type int_type;
typedef _CharT char_type;
typedef ctype<_CharT> __ctype_type;
streamsize __extracted = 0;
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 = numeric_limits<streamsize>::max();
const __ctype_type& __ctype = 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
&& __c != __eof && !__ctype.is(ctype_base::space, __c))
{
*__s++ = __c;
++__extracted;
__c = __sb->snextc();
}
if (__c == __eof)
__in.setstate(ios_base::eofbit);
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
//68. Extractors for char* should store null at end
*__s = char_type();
#endif
__in.width(0);
}
catch(exception& __fail)
{
// 27.6.1.2.1 Common requirements.
// Turn this on without causing an ios::failure to be thrown.
__in.setstate(ios_base::badbit);
if ((__in.exceptions() & ios_base::badbit) != 0)
__throw_exception_again;
}
}
if (!__extracted)
__in.setstate(ios_base::failbit);
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 typename __istream_type::__streambuf_type __streambuf_type;
typedef typename __istream_type::__ctype_type __ctype_type;
typedef typename __istream_type::int_type __int_type;
const __ctype_type& __ctype = use_facet<__ctype_type>(__in.getloc());
const __int_type __eof = _Traits::eof();
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sgetc();
while (__c != __eof && __ctype.is(ctype_base::space, __c))
__c = __sb->snextc();
if (__c == __eof)
__in.setstate(ios_base::eofbit);
return __in;
}
// 21.3.7.9 basic_string::getline and operators
template<typename _CharT, typename _Traits, typename _Alloc>
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __in,
basic_string<_CharT, _Traits, _Alloc>& __str)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::int_type __int_type;
typedef typename __istream_type::__streambuf_type __streambuf_type;
typedef typename __istream_type::__ctype_type __ctype_type;
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef typename __string_type::size_type __size_type;
__size_type __extracted = 0;
typename __istream_type::sentry __cerb(__in, false);
if (__cerb)
{
__str.erase();
streamsize __w = __in.width();
__size_type __n;
__n = __w > 0 ? static_cast<__size_type>(__w) : __str.max_size();
const __ctype_type& __ctype = use_facet<__ctype_type>(__in.getloc());
const __int_type __eof = _Traits::eof();
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sgetc();
while (__extracted < __n
&& __c != __eof && !__ctype.is(ctype_base::space, __c))
{
__str += _Traits::to_char_type(__c);
++__extracted;
__c = __sb->snextc();
}
if (__c == __eof)
__in.setstate(ios_base::eofbit);
__in.width(0);
}
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
//211. operator>>(istream&, string&) doesn't set failbit
if (!__extracted)
__in.setstate (ios_base::failbit);
#endif
return __in;
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>& __in,
basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::int_type __int_type;
typedef typename __istream_type::__streambuf_type __streambuf_type;
typedef typename __istream_type::__ctype_type __ctype_type;
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef typename __string_type::size_type __size_type;
__size_type __extracted = 0;
bool __testdelim = false;
typename __istream_type::sentry __cerb(__in, true);
if (__cerb)
{
__str.erase();
__size_type __n = __str.max_size();
__int_type __idelim = _Traits::to_int_type(__delim);
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sbumpc();
const __int_type __eof = _Traits::eof();
__testdelim = _Traits::eq_int_type(__c, __idelim);
while (__extracted <= __n
&& !_Traits::eq_int_type(__c, __eof)
&& !__testdelim)
{
__str += _Traits::to_char_type(__c);
++__extracted;
__c = __sb->sbumpc();
__testdelim = _Traits::eq_int_type(__c, __idelim);
}
if (_Traits::eq_int_type(__c, __eof))
__in.setstate(ios_base::eofbit);
}
if (!__extracted && !__testdelim)
__in.setstate(ios_base::failbit);
return __in;
}
template<class _CharT, class _Traits, class _Alloc>
inline basic_istream<_CharT,_Traits>&
getline(basic_istream<_CharT, _Traits>& __in,
basic_string<_CharT,_Traits,_Alloc>& __str)
{ return getline(__in, __str, __in.widen('\n')); }
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
// NB: This syntax is a GNU extension.
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*);
#ifdef _GLIBCPP_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*);
#endif
} // namespace std
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