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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_sputbackc_1out.tst"; // empty file, need to create
 
// Test overloaded virtual functions.
void test01() 
{
  using namespace std;
  using namespace __gnu_test;
  typedef std::filebuf::int_type 	int_type;
  typedef filebuf::traits_type 		traits_type;
 
  bool test __attribute__((unused)) = true;
  int_type 			c1, c2;
 
  // int_type sputbackc(char_type c)
  // if in_cur not avail || ! traits::eq(c, gptr() [-1]), return pbfail
  // otherwise decrements in_cur and returns *gptr()
 
  // out
  {
    constraint_filebuf fb_01; // out
    fb_01.open(name_01, ios::out | ios::trunc);    
    VERIFY( !fb_01.write_position() );
    VERIFY( !fb_01.read_position() );
    c1 = fb_01.sgetc();
    VERIFY( c1 == traits_type::eof() );
    c2 = fb_01.sputbackc('a');
    VERIFY( c2 == traits_type::eof() );
    fb_01.sbumpc();
    c1 = fb_01.sbumpc();
    c2 = fb_01.sputbackc('a');
    VERIFY( c1 == c2 );
    VERIFY( !fb_01.write_position() );
    VERIFY( !fb_01.read_position() );
  }
}
 
int main() 
{
  test01();
  return 0;
}