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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[] = "tmp_sungetc_1io.tst"; // empty file, need to create

void test01()

{

  using namespace std;

  using namespace __gnu_test;

  typedef filebuf::int_type     int_type;

  typedef filebuf::traits_type  traits_type;

  typedef size_t                size_type;

  bool test __attribute__((unused)) = true;

  streamsize                    strmsz_1, strmsz_2;

  int_type                      c1, c2, c3;

  // int_type sungetc()

  // if in_cur not avail, return pbackfail(), else decrement and

  // return to_int_type(*gptr())

  // in | out

  {

    constraint_filebuf fb_01;

    fb_01.open(name_01, ios_base::out | ios_base::in | ios_base::trunc);

    VERIFY( !fb_01.write_position() );

    VERIFY( !fb_01.read_position() );

    fb_01.sputc('u');

    fb_01.sputc('v');

    fb_01.pubseekoff(-1, std::ios_base::end);

    c3 = fb_01.sbumpc();

    strmsz_1 = fb_01.in_avail();

    c2 = fb_01.sungetc();

    strmsz_2 = fb_01.in_avail();

    VERIFY( c2 == 'v' ); //  VERIFY( c2 != traits_type::eof() );

    VERIFY( strmsz_1 + 1 == strmsz_2 );

    //test for _in_cur == _in_end

    fb_01.pubseekoff(0, std::ios_base::end);

    strmsz_1 = fb_01.in_avail(); // -1 cuz at the end

    c1 = fb_01.sgetc();

    c2 = fb_01.sungetc();

    strmsz_2 = fb_01.in_avail(); // 1

    c3 = fb_01.sgetc();

    VERIFY( c1 != c2 );

    VERIFY( strmsz_2 != strmsz_1 );

    VERIFY( strmsz_2 == 1 );

    VERIFY( !fb_01.write_position() );

    VERIFY( fb_01.read_position() );

  }

}

int main()

{

  test01();

  return 0;

}