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// -*- C++ -*-
// Testing streambuf/filebuf/stringbuf for the C++ library testsuite.
//
// Copyright (C) 2003-2022 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/>.
//
#ifndef _GLIBCXX_TESTSUITE_IO_H
#define _GLIBCXX_TESTSUITE_IO_H
#include <ios>
namespace __gnu_test
{
// Used to verify the constraints/requirements on get and put areas
// as defined in
// 27.5.1 - Stream buffer requirements: get and put areas
// 27.8.1.1 - Template class basic_filebuf p 3
// If the file is not open (ios_base::in) -> input seq. cannot be read
// If the file is not open (ios_base::out) -> output seq. cannot be written
// Joint file position
// 27.8.1.4 - Overridden virtual functions p9
// If unbuffered, pbase == pptr == NULL
// 27.7.1.1 - Basic_stringbuf constructors p 1
// 27.8.1.2 - Basic_filebuf constructors p 1
// ... , initializing the base class with basic_streambuf() 27.5.2.1
template<typename T>
class constraint_buf
: public T
{
public:
bool
write_position()
{
bool one = this->pptr() != 0;
bool two = this->pptr() < this->epptr();
return one && two;
}
bool
read_position()
{
bool one = this->gptr() != 0;
bool two = this->gptr() < this->egptr();
return one && two;
}
bool
unbuffered()
{
bool one = this->pbase() == 0;
bool two = this->pptr() == 0;
return one && two;
}
bool
check_pointers()
{
bool one = this->eback() == 0;
bool two = this->gptr() == 0;
bool three = this->egptr() == 0;
bool four = this->pbase() == 0;
bool five = this->pptr() == 0;
bool six = this->epptr() == 0;
return one && two && three && four && five && six;
}
};
typedef constraint_buf<std::streambuf> constraint_streambuf;
typedef constraint_buf<std::filebuf> constraint_filebuf;
typedef constraint_buf<std::stringbuf> constraint_stringbuf;
#ifdef _GLIBCXX_USE_WCHAR_T
typedef constraint_buf<std::wstreambuf> constraint_wstreambuf;
typedef constraint_buf<std::wfilebuf> constraint_wfilebuf;
typedef constraint_buf<std::wstringbuf> constraint_wstringbuf;
#endif
// Used to check if basic_streambuf::pubsync() has been called.
// This is useful for checking if a function creates [io]stream::sentry
// objects, since the sentry constructors call tie()->flush().
template<typename T>
class sync_buf
: public T
{
private:
bool m_sync_called;
public:
sync_buf()
: m_sync_called(false)
{ }
bool sync_called() const
{ return m_sync_called; }
protected:
int sync()
{
m_sync_called = true;
return 0;
}
};
typedef sync_buf<std::streambuf> sync_streambuf;
#ifdef _GLIBCXX_USE_WCHAR_T
typedef sync_buf<std::wstreambuf> sync_wstreambuf;
#endif
// Throws on all overflow and underflow calls.
struct underflow_error: std::exception { };
struct overflow_error: std::exception { };
struct positioning_error: std::exception { };
template<typename T>
struct fail_buf
: public T
{
typedef typename T::char_type char_type;
typedef typename T::int_type int_type;
typedef typename T::off_type off_type;
typedef typename T::pos_type pos_type;
private:
char_type p[2];
public:
fail_buf()
{
p[0] = char_type('s');
p[1] = char_type();
this->setg(p, p, p + 1);
}
virtual int_type underflow()
{
throw underflow_error();
return int_type();
}
virtual int_type uflow()
{
throw underflow_error();
return int_type();
}
virtual int_type
overflow(int_type)
{
throw overflow_error();
return int_type();
}
virtual pos_type
seekoff(off_type, std::ios_base::seekdir, std::ios_base::openmode)
{
throw positioning_error();
return pos_type(off_type(-1));
}
virtual pos_type
seekpos(pos_type, std::ios_base::openmode)
{
throw positioning_error();
return pos_type(off_type(-1));
}
virtual int
sync()
{
throw positioning_error();
return 0;
}
};
typedef fail_buf<std::streambuf> fail_streambuf;
#ifdef _GLIBCXX_USE_WCHAR_T
typedef fail_buf<std::wstreambuf> fail_wstreambuf;
#endif
// Facets that throw an exception for every virtual function.
struct facet_error: std::exception { };
template<typename T>
class fail_num_get
: public std::num_get<T>
{
typedef std::ios_base ios_base;
typedef typename std::num_get<T>::iter_type iter_type;
protected:
iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&, bool&) const
{ throw facet_error(); return iter_type(); }
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&, long&) const
{ throw facet_error(); return iter_type(); }
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
unsigned short&) const
{ throw facet_error(); return iter_type(); }
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
unsigned int&) const
{ throw facet_error(); return iter_type(); }
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
unsigned long&) const
{ throw facet_error(); return iter_type(); }
#ifdef _GLIBCXX_USE_LONG_LONG
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
long long&) const
{ throw facet_error(); return iter_type(); }
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
unsigned long long&) const
{ throw facet_error(); return iter_type(); }
#endif
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
float&) const
{ throw facet_error(); return iter_type(); }
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
double&) const
{ throw facet_error(); return iter_type(); }
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
long double&) const
{ throw facet_error(); return iter_type(); }
virtual iter_type
do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
void*&) const
{ throw facet_error(); return iter_type(); }
};
typedef fail_num_get<char> fail_num_get_char;
#ifdef _GLIBCXX_USE_WCHAR_T
typedef fail_num_get<wchar_t> fail_num_get_wchar_t;
#endif
template<typename T>
class fail_num_put
: public std::num_put<T>
{
typedef std::ios_base ios_base;
typedef typename std::num_put<T>::iter_type iter_type;
typedef typename std::num_put<T>::char_type char_type;
protected:
iter_type
do_put(iter_type, ios_base&, char_type, bool) const
{ throw facet_error(); return iter_type(0); }
virtual iter_type
do_put(iter_type, ios_base&, char_type, long) const
{ throw facet_error(); return iter_type(0); }
virtual iter_type
do_put(iter_type, ios_base&, char_type, unsigned long) const
{ throw facet_error(); return iter_type(0); }
#ifdef _GLIBCXX_USE_LONG_LONG
virtual iter_type
do_put(iter_type, ios_base&, char_type, long long) const
{ throw facet_error(); return iter_type(0); }
virtual iter_type
do_put(iter_type, ios_base&, char_type, unsigned long long) const
{ throw facet_error(); return iter_type(0); }
#endif
virtual iter_type
do_put(iter_type, ios_base&, char_type, double) const
{ throw facet_error(); return iter_type(0); }
virtual iter_type
do_put(iter_type, ios_base&, char_type, long double) const
{ throw facet_error(); return iter_type(0); }
virtual iter_type
do_put(iter_type, ios_base&, char_type, const void*) const
{ throw facet_error(); return iter_type(0); }
};
typedef fail_num_put<char> fail_num_put_char;
#ifdef _GLIBCXX_USE_WCHAR_T
typedef fail_num_put<wchar_t> fail_num_put_wchar_t;
#endif
} // namespace __gnu_test
#endif // _GLIBCXX_TESTSUITE_IO_H
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