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// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
 
// Copyright (C) 2001, 2002, 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 <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;
}