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// { dg-require-fileio "" }

// 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/>.

// 27.8.1.4 Overridden virtual functions

#include <fstream>

#include <cstring>

#include <testsuite_hooks.h>

void test01()

{

  using namespace std;

  bool test __attribute__((unused)) = true;

  typedef filebuf::pos_type pos_type;

  const char name[] = "tmp_seekoff-4.tst";

  const size_t size = 12;

  char buf[size];

  streamsize n;

  filebuf fb;

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

  n = fb.sputn("abcd", 4);

  VERIFY( n == 4 );

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

  n = fb.sgetn(buf, 3);

  VERIFY( n == 3 );

  VERIFY( !memcmp(buf, "abc", 3) );

  // Check read => write without pubseekoff(0, ios_base::cur)

  n = fb.sputn("ef", 2);

  VERIFY( n == 2 );

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

  n = fb.sgetn(buf, size);

  VERIFY( n == 5 );

  VERIFY( !memcmp(buf, "abcef", 5) );

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

  n = fb.sputn("gh", 2);

  VERIFY( n == 2 );

  // Check write => read without pubseekoff(0, ios_base::cur)

  n = fb.sgetn( buf, 3 );

  VERIFY( !memcmp(buf, "cef", 3) );

  n = fb.sputn("ijkl", 4);

  VERIFY( n == 4 );

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

  n = fb.sgetn(buf, 2);

  VERIFY( n == 2 );

  VERIFY( !memcmp(buf, "gh", 2) );

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

  n = fb.sputn("mno", 3);

  VERIFY( n == 3 );

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

  n = fb.sgetn(buf, size);

  VERIFY( n == 12 );

  VERIFY( !memcmp(buf, "ghcefijklmno", 12) );

  fb.close();

}

int main()

{

  test01();

  return 0;

}