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// Copyright (C) 2003 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// 27.8.1.4 Overridden virtual functions

#include <locale>

#include <fstream>

#include <testsuite_hooks.h>

class Cvt : public std::codecvt<wchar_t, char, std::mbstate_t>

{

public:

  mutable bool unshift_called;

  Cvt()

  : unshift_called(false)

  { }

protected:

  bool

  do_always_noconv() const throw()

  { return false; }

  int

  do_encoding() const throw()

  { return -1; }

  std::codecvt_base::result

  do_unshift(std::mbstate_t&, char* to, char*, char*& to_next) const

  {

    unshift_called = true;

    to_next = to;

    return std::codecvt_base::ok;

  }

};

// libstdc++/12790

// basic_filebuf::seekoff() should call codecvt::unshift()

void test01()

{

  using namespace std;

  bool test __attribute__((unused)) = true;

  const char* name = "tmp_seekoff_12790";

  Cvt* cvt = new Cvt;

  locale loc(locale::classic(), cvt);

  wfilebuf fb;

  fb.pubimbue(loc);

  fb.open(name, ios_base::out);

  fb.sputc(L'a');

  VERIFY( !cvt->unshift_called );

  fb.pubseekoff(0, ios_base::cur);

  VERIFY( cvt->unshift_called );

}

int main()

{

  test01();

  return 0;

}