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

// Copyright (C) 2001-2021 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 <testsuite_hooks.h>

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

// NB: This test assumes that _M_buf_size == 40, and not the usual
// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
// simulated a bit more readily.
// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
const int buffer_size = 8192;
//const int buffer_size = 40;

const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create

class derived_filebuf: public std::filebuf
{
 public:
  void
  set_size(int_type __size) { _M_buf_size = __size; }
};

derived_filebuf fb_01; // in 
derived_filebuf fb_02; // out
derived_filebuf fb_03; // in | out

// Initialize filebufs to be the same size regardless of platform.
void test03()
{
  fb_01.set_size(buffer_size);
  fb_02.set_size(buffer_size);
  fb_03.set_size(buffer_size);
}

// Test overloaded virtual functions.
void test05() 
{
  typedef std::filebuf::int_type 	int_type;
  typedef std::filebuf::traits_type 	traits_type;
  typedef std::filebuf::pos_type 	pos_type;
  typedef std::filebuf::off_type 	off_type;
  typedef size_t 			size_type;

  std::filebuf 				f_tmp;

  fb_01.open(name_01, std::ios_base::in);
  fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
  fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc);

  // NB Have to close these suckers. . .
  // filebuf_type* close()
  fb_01.close();
  fb_02.close();
  fb_03.close();
  VERIFY( !fb_01.is_open() );
  VERIFY( !fb_02.is_open() );
  VERIFY( !fb_03.is_open() );
}

int main() 
{
  test03();
  test05();
  return 0;
}