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// Copyright (C) 2020-2024 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-do run }
// { dg-options "-DSIMULATOR_TEST" { target simulator } }
// { dg-timeout-factor 2 { target ilp32 } }
// PR libstdc++/94749
// basic_istream::ignore(n, c) discards n+1 if next character is equal to c.
#include <sstream>
#include <limits>
#include <testsuite_hooks.h>
typedef wchar_t C;
void
test01()
{
std::basic_istringstream<C> s(L" + -");
s.ignore(1, L'+');
VERIFY( s.gcount() == 1 );
VERIFY( s.get() == L'+' );
s.ignore(3, L'-');
VERIFY( s.gcount() == 3 );
VERIFY( s.get() == L'-' );
}
void
test02()
{
std::basic_istringstream<C> s(L".+...-");
s.ignore(1, L'+');
VERIFY( s.gcount() == 1 );
VERIFY( s.get() == L'+' );
s.ignore(3, L'-');
VERIFY( s.gcount() == 3 );
VERIFY( s.get() == L'-' );
}
void
test03()
{
std::basic_istringstream<C, __gnu_cxx::char_traits<C> > s(L" + -");
s.ignore(1, L'+');
VERIFY( s.gcount() == 1 );
VERIFY( s.get() == L'+' );
s.ignore(3, L'-');
VERIFY( s.gcount() == 3 );
VERIFY( s.get() == L'-' );
}
void
test04()
{
std::basic_istringstream<C, __gnu_cxx::char_traits<C> > s(L".+...-");
s.ignore(1, L'+');
VERIFY( s.gcount() == 1 );
VERIFY( s.get() == L'+' );
s.ignore(3, L'-');
VERIFY( s.gcount() == 3 );
VERIFY( s.get() == L'-' );
}
// The original fix for PR libstdc++/94749 failed to discard the delimiter
// if it occurred after numeric_limits<streamsize>::max() had been seen.
// This streambuf will keep filling the get area with zero bytes until
// almost numeric_limits<streamsize>::max() characters have been read,
// and then return one more buffer that has L"123" at its end.
template<typename T>
struct buff : std::basic_streambuf<typename T::char_type, T>
{
typedef typename T::char_type char_type;
typedef typename T::int_type int_type;
typedef std::streamsize streamsize;
typedef std::numeric_limits<streamsize> limits;
buff() : count(0), buf() { }
int_type underflow()
{
// Number of characters left until we overflow the counter
const streamsize headroom = limits::max() - count;
if (headroom == 0)
return T::eof();
if (bufsz < headroom)
{
this->setg(buf, buf, buf + bufsz);
count += bufsz;
}
else
{
// write L"123" across the 2GB boundary
buf[headroom-1] = L'1';
buf[headroom+0] = L'2';
buf[headroom+1] = L'3';
this->setg(buf, buf, buf + headroom + 2);
count = limits::max();
}
return buf[0];
}
streamsize count;
static const streamsize bufsz = 2048 << limits::digits10;
char_type buf[bufsz + 2];
};
void
test05()
{
// Not possible to overflow 64-bit streamsize in reasonable time.
if (std::numeric_limits<std::streamsize>::digits > 32)
return;
typedef std::char_traits<C> T;
std::basic_istream<C, T> in(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'1');
VERIFY(in.good());
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == L'2');
VERIFY(in.get() == L'3');
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'2');
VERIFY(in.good());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == L'3');
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'3');
VERIFY(in.good());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'4');
VERIFY(in.eof());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == T::eof());
delete in.rdbuf(0);
}
void
test06()
{
if (std::numeric_limits<std::streamsize>::digits > 32)
return;
typedef __gnu_cxx::char_traits<C> T;
std::basic_istream<C, T> in(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'1');
VERIFY(in.good());
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == L'2');
VERIFY(in.get() == L'3');
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'2');
VERIFY(in.good());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == L'3');
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'3');
VERIFY(in.good());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'4');
VERIFY(in.eof());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == T::eof());
delete in.rdbuf(0);
}
int
main()
{
test01();
test02();
test03();
test04();
#ifndef SIMULATOR_TEST
test05();
test06();
#endif
}
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