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

// Copyright (C) 2001, 2002, 2003, 2009 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

// { dg-require-fileio "" }

#include <fstream>

#include <testsuite_hooks.h>

#include <testsuite_io.h>

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

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

const char name_01[] = "tmp_sputbackc_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 sputbackc(char_type c)

  // if in_cur not avail || ! traits::eq(c, gptr() [-1]), return pbfail

  // otherwise decrements in_cur and returns *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() );

    strmsz_1 = fb_01.sputn("racadabras", 10);//"abracadabras or what?"

    strmsz_2 = fb_01.sputn(", i wanna reach out and", 10);

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

    c1 = fb_01.sgetc(); // -1

    c2 = fb_01.sputbackc('z');

    strmsz_2 = fb_01.in_avail();

    c3 = fb_01.sgetc();

    VERIFY( c3 == c2 );

    VERIFY( c1 != c3 );

    VERIFY( 1 == strmsz_2 );

    //test for _in_cur == _in_beg

    // fb_01._M_out_beg = "bd23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZracada" etc

    fb_01.pubseekoff(10, std::ios_base::beg);

    fb_01.sputc('m');

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

    strmsz_1 = fb_01.in_avail();

    c1 = fb_01.sgetc();

    fb_01.snextc();

    c2 = fb_01.sputbackc('z');

    strmsz_2 = fb_01.in_avail();

    c3 = fb_01.sgetc();

    VERIFY( c1 != c2 );

    VERIFY( c3 == c2 );

    VERIFY( c1 != c3 );

    VERIFY( c2 == 'z' );

    // test for replacing char with identical one

    fb_01.snextc();

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

    fb_01.sputc('u');

    fb_01.sputc('v');

    fb_01.sputc('a');

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

    strmsz_1 = fb_01.in_avail();

    c2 = fb_01.sputbackc('a');

    strmsz_2 = fb_01.in_avail();

    c3 = fb_01.sgetc();

    VERIFY( c3 == c2 );

    VERIFY( strmsz_1 + 1 == strmsz_2 );

    VERIFY( !fb_01.write_position() );

    VERIFY( fb_01.read_position() );

  }

}

int main()

{

  test01();

  return 0;

}