// Copyright (C) 2005-2023 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/>.

// 27.6.2.6 Unformatted output functions
//
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 60. What is a formatted input function?
// basic_ostream::flush() does not behave as an unformatted output function.
// But wait  ...
// 581. flush() not unformatted function
// So now basic_ostream::flush() *is* an unformatted output function.

#include <ostream>
#include <testsuite_hooks.h>
#include <testsuite_io.h>

void
test01()
{
  std::wostream os(0);
  VERIFY( os.bad() );

  // Nothing should happen if os.rdbuf() is null. No sentry is constructed.
  os.flush();
  VERIFY( os.rdstate() == std::ios_base::badbit ); // no failbit

  os.exceptions(std::ios_base::failbit);
  os.flush();
}

void test02()
{
  __gnu_test::sync_wstreambuf buf;
  std::wostream os(&buf);

  __gnu_test::sync_wstreambuf buf_tie;
  std::wostream os_tie(&buf_tie);

  // A sentry should be constructed so os.tie()->flush() should be called.
  os.tie(&os_tie);

  os.flush();

  VERIFY( os.good() );
  VERIFY( buf.sync_called() );
  VERIFY( buf_tie.sync_called() );
}

void
test03()
{
  __gnu_test::sync_wstreambuf buf;
  std::wostream os(&buf);

  __gnu_test::sync_wstreambuf buf_tie;
  std::wostream os_tie(&buf_tie);

  os.tie(&os_tie);

  // os.rdbuf()->pubsync() should not be called if !os.good().
  os.setstate(std::ios_base::eofbit);

  os.flush();

  VERIFY( os.rdstate() & std::ios_base::eofbit );
  VERIFY( !buf.sync_called() );
  VERIFY( !buf_tie.sync_called() );
}

int main()
{
  test01();
  test02();
  test03();
}