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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>

// @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;

  bool test __attribute__((unused)) = true;

  std::filebuf                          f_tmp;

  std::streamoff                        strmof_1, strmof_2;

  // GET

  // int in_avail()

  // if a read position is available, return _M_in_end - _M_in_cur.

  // else return showmanyc.

  strmof_1 = fb_01.in_avail();

  strmof_2 = fb_02.in_avail();

  VERIFY( strmof_1 == -1 );

  VERIFY( strmof_1 == strmof_2 ); //fail because not open

  strmof_1 = fb_03.in_avail();

  VERIFY( strmof_1 == strmof_2 );

  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);

  strmof_1 = fb_01.in_avail();

  strmof_2 = fb_02.in_avail();

  VERIFY( strmof_1 != strmof_2 );

  VERIFY( strmof_1 >= 0 );

  VERIFY( strmof_2 == -1 );  // empty file

  strmof_1 = fb_03.in_avail();

  VERIFY( strmof_1  == 0 ); // empty file

}

int main()

{

  test03();

  test05();

  return 0;

}