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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 "" }

// { dg-require-binary-io "" }

#include <fstream>

#include <testsuite_hooks.h>

#include <testsuite_io.h>

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

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

const char name_01[] = "seekoff-2io.tst";

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;

  bool test __attribute__((unused)) = true;

  streamsize                    strmsz_1, strmsz_2;

  int_type c1;

  int_type c2;

  int_type c3;

  pos_type pt_1(off_type(-1));

  pos_type pt_2(off_type(0));

  off_type off_1 = 0;

  off_type off_2 = 0;

  // seekoff

  // pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which)

  // alters the stream position to off

  // in | out

  {

    constraint_filebuf fb;

    fb.pubsetbuf(0, 0);

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

    VERIFY( fb.unbuffered() );

    //beg

    strmsz_1 = fb.in_avail();

    pt_1 = fb.pubseekoff(2, ios_base::beg);

    strmsz_2 = fb.in_avail();

    off_1 = off_type(pt_1);

    VERIFY( off_1 > 0 );

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

    VERIFY( c1 == '9' );

    fb.pubseekoff(3, ios_base::beg);

    c2 = fb.sputc('\n');  //current in pointer +1

    fb.pubseekoff(4, ios_base::beg);

    c3 = fb.sgetc();

    VERIFY( c2 != c3 );

    VERIFY( c3 == '9' );

    fb.pubsync();

    c1 = fb.sgetc();

    VERIFY( c1 == c3 );

    //cur

    pt_2 = fb.pubseekoff(2, ios_base::cur);

    off_2 = off_type(pt_2);

    VERIFY( (off_2 == (off_1 + 2 + 1 + 1)) );

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

    VERIFY( c1 == '1' );

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

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

    c3 = fb.sputc('\n');

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

    c1 = fb.sgetc();

    fb.pubsync();

    c3 = fb.sgetc();

    VERIFY( c1 == c3 );

    //end

    pt_2 = fb.pubseekoff(0, ios_base::end);

    off_1 = off_type(pt_2);

    VERIFY( off_1 > off_2 ); //weak, but don't know exactly where it ends

    c3 = fb.sputc('\n');

    strmsz_1 = fb.sputn("because because because. . .", 28);

    VERIFY( strmsz_1 == 28 );

    fb.pubseekoff(-1, ios_base::end);

    fb.sgetc();

    c1 = fb.sungetc();

    // Defect?  retval of sungetc is not necessarily the character ungotten.

    // So re-get it.

    c1 = fb.sgetc();

    fb.pubsync();

    c3 = fb.sgetc();

    VERIFY( c1 == c3 );

    VERIFY( fb.unbuffered() );

  }

}

int main()

{

  test05();

  return 0;

}