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// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>

// Copyright (C) 2001, 2002, 2003, 2009 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/>.

// 27.8.1.4 Overridden virtual functions

// { dg-require-fileio "" }

#include <fstream>

#include <testsuite_hooks.h>

#include <testsuite_io.h>

// @require@ %-*.tst %-*.txt

// @diff@ %-*.tst %*.txt

const char name_01[] = "seekpos.txt"; // file with data in it

void test05()

{

  using namespace std;

  using namespace __gnu_test;

  typedef filebuf::int_type     int_type;

  typedef filebuf::pos_type     pos_type;

  typedef filebuf::off_type     off_type;

  typedef filebuf::traits_type  traits_type;

  bool test __attribute__((unused)) = true;

  int_type c1;

  int_type c2;

  int_type c3;

  pos_type pt_1(off_type(-1));

  pos_type pt_2(off_type(0));

  pos_type pt_3;

  off_type off_1 = 0;

  off_type off_2 = 0;

  // seekpos

  // pubseekpos(pos_type sp, ios_base::openmode)

  // alters the stream position to sp

  // in 

  {

    constraint_filebuf fb;

    fb.open(name_01, ios_base::in);

    VERIFY( !fb.write_position() );

    // beg

    pt_1 = fb.pubseekoff(78, ios_base::beg);

    off_1 = off_type(pt_1);

    VERIFY( off_1 > 0 );

    c1 = fb.snextc(); //current in pointer +1

    VERIFY( c1 == 't' );

    // cur

    pt_3 = fb.pubseekoff(0, ios_base::cur);

    fb.pubseekpos(pt_3);

    c2 = fb.sputc('\n'); //test current out pointer

    pt_3 = fb.pubseekoff(0, ios_base::cur);

    fb.pubseekpos(pt_3);

    c3 = fb.sgetc();

    fb.pubsync(); //resets pointers

    pt_2 = fb.pubseekpos(pt_1);

    off_2 = off_type(pt_2);

    VERIFY( off_1 == off_2 );

    c3 = fb.snextc(); //current in pointer +1

    VERIFY( c2 == traits_type::eof() );

    VERIFY( c2 != c3 );

    // end

    pt_1 = fb.pubseekoff(0, ios_base::end);

    off_1 = off_type(pt_1);

    VERIFY( off_1 > off_2 );

    fb.sputn("\nof the wonderful things he does!!\nok", 37);

    fb.pubsync();

    VERIFY( !fb.write_position() );

    fb.close();

    VERIFY( !fb.is_open() );

  }

}

int main()

{

  test05();

  return 0;

}