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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 <fstream>

#include <locale>

#include <algorithm>

#include <cstring>

#include <testsuite_hooks.h>

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

{

protected:

  virtual std::codecvt_base::result

  do_out(std::mbstate_t&, const wchar_t* from, const wchar_t* from_end,

         const wchar_t*& from_next, char* to, char* to_end,

         char*& to_next) const

  {

    std::size_t from_len = from_end - from;

    std::size_t to_len = (to_end - to) / sizeof(wchar_t);

    std::size_t len = std::min(from_len, to_len);

    std::memcpy(to, from, len * sizeof(wchar_t));

    from_next = from + len;

    to_next = to + len * sizeof(wchar_t);

    return from_next == from_end ? std::codecvt_base::ok :

           std::codecvt_base::partial;

  }

  virtual std::codecvt_base::result

  do_in(std::mbstate_t&, const char* from, const char* from_end,

        const char*& from_next, wchar_t* to, wchar_t* to_end,

        wchar_t*& to_next) const

  {

    std::size_t from_len =

      (from_end - from) / sizeof(wchar_t);

    std::size_t to_len = to_end - to;

    std::size_t len = std::min(from_len, to_len);

    std::memcpy(to, from, len * sizeof(wchar_t));

    from_next = from + len * sizeof(wchar_t);

    to_next = to + len;

    return from_next == from_end ? std::codecvt_base::ok :

           std::codecvt_base::partial;

  }

  virtual std::codecvt_base::result

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

  { return std::codecvt_base::noconv; }

  virtual int do_encoding() const throw() { return sizeof(wchar_t); }

  virtual bool do_always_noconv() const throw() { return false; }

  virtual int

  do_length(std::mbstate_t&, const char* from, const char* end,

            std::size_t max)

  {

    std::size_t len = (end - from) / sizeof(wchar_t);

    return std::min(len, max) * sizeof(wchar_t);

  }

  virtual int do_max_length() const throw() { return sizeof(wchar_t); }

};

void test01()

{

  using namespace std;

  bool test __attribute__((unused)) = true;

  // seekoff

  wfilebuf fb;

  fb.pubimbue(locale(locale::classic(), new Cvt));

  fb.open("tmp_9875_seekoff", ios_base::out | ios_base::in | ios_base::trunc);

  fb.sputn(L"0123456789", 10);

  fb.pubseekoff(-3, ios_base::cur);

  VERIFY( fb.sgetc() == L'7' );

  fb.pubseekoff(-3, ios_base::cur);

  VERIFY( fb.sgetc() == L'4' );

  fb.close();

}

int main()

{

  test01();

  return 0;

}