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// Copyright (C) 2010 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-require-fileio "" }

#include <fstream>

#include <testsuite_hooks.h>

#include <testsuite_character.h>

const char name_01[] = "tmp_seekoff_45628.tst";

unsigned underflows, overflows;

class my_filebuf

: public std::basic_filebuf<__gnu_test::pod_uchar>

{

  virtual int_type

  underflow()

  {

    ++underflows;

    return std::basic_filebuf<__gnu_test::pod_uchar>::underflow();

  }

  virtual int_type

  overflow(int_type c)

  {

    ++overflows;

    return std::basic_filebuf<__gnu_test::pod_uchar>::overflow(c);

  }

};

// libstdc++/45628

void test01()

{

  bool test __attribute__((unused)) = true;

  using __gnu_test::pod_uchar;

  std::locale loc(std::locale::classic(),

             new std::codecvt<my_filebuf::traits_type::char_type, char,

             my_filebuf::traits_type::state_type>);

  my_filebuf::pos_type opos[3], ipos[3];

  my_filebuf q;

  q.pubimbue(loc);

  q.open(name_01, std::ios_base::in | std::ios_base::out

         | std::ios_base::trunc);

  q.sputc(pod_uchar::from<char>('a'));

  opos[0] = q.pubseekoff(0, std::ios_base::cur);

  q.sputc(pod_uchar::from<char>('b'));

  opos[1] = q.pubseekoff(0, std::ios_base::cur);

  q.sputc(pod_uchar::from<char>('c'));

  opos[2] = q.pubseekoff(0, std::ios_base::cur);

  VERIFY( overflows <= 9 ); // pubseekoff calls overflow twice if converting.

  // NB: checking opos==ipos is not very rigorous as long as it flushes, since

  // all positions will be at initial state.

  q.pubseekoff(0, std::ios_base::beg);

  q.sbumpc();

  VERIFY( underflows == 1 );

  ipos[0] = q.pubseekoff(0, std::ios_base::cur);

  VERIFY( ipos[0] == opos[0] );

  q.sbumpc();

  ipos[1] = q.pubseekoff(0, std::ios_base::cur);

  VERIFY( ipos[1] == opos[1] );

  q.sbumpc();

  ipos[2] = q.pubseekoff(0, std::ios_base::cur);

  VERIFY( ipos[2] == opos[2] );

  VERIFY( underflows == 1 ); // pubseekoff never flushes get area

  // Bonus test: check automatic mode switches.

  q.sputc(pod_uchar::from<char>('d'));

  q.pubseekpos( ipos[1] );

  q.sputc(pod_uchar::from<char>('e'));

  VERIFY( my_filebuf::traits_type::eq(

                        my_filebuf::traits_type::to_char_type(q.sgetc()),

                        pod_uchar::from<char>('d')) );

}

int main()

{

  test01();

  return 0;

}