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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>

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

unsigned underflows, overflows;

class my_filebuf

: public std::filebuf

{

  virtual int_type

  underflow()

  {

    ++underflows;

    return std::filebuf::underflow();

  }

  virtual int_type

  overflow(int_type c)

  {

    ++overflows;

    return std::filebuf::overflow(c);

  }

};

// libstdc++/45628

void test01()

{

  bool test __attribute__((unused)) = true;

  my_filebuf q;

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

         | std::ios_base::trunc);

  q.sputc('a');

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

  q.sputc('b');

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

  q.sputc('c');

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

  VERIFY( overflows <= 1 ); // only initial sputc allowed to overflow

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

  q.sbumpc();

  VERIFY( underflows == 1 );

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

  q.sbumpc();

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

  q.sbumpc();

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

  VERIFY( underflows == 1 );

}

int main()

{

  test01();

  return 0;

}