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// 2000-06-29 bkoz

// Copyright (C) 2000, 2001, 2002, 2003, 2009 Free Software Foundation

//

// 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/>.

// 27.6.1.3 unformatted input functions

// NB: ostream has a particular "seeks" category. Adopt this for istreams too.

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

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

// { dg-require-fileio "" }

#include <istream>

#include <sstream>

#include <fstream>

#include <testsuite_hooks.h>

// fstreams

void test04(void)

{

  typedef std::istream::off_type off_type;

  bool test __attribute__((unused)) = true;

  std::istream::pos_type pos01, pos02, pos03, pos04, pos05, pos06;

  std::ios_base::iostate state01, state02;

  const char str_lit01[] = "istream_seeks-1.txt";

  const char str_lit02[] = "istream_seeks-2.txt";

  std::ifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);

  std::ifstream if02(str_lit01, std::ios_base::in);

  std::ifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc);

  VERIFY( if01.good() );

  VERIFY( if02.good() );

  VERIFY( if03.good() );

  std::istream is01(if01.rdbuf());

  std::istream is02(if02.rdbuf());

  std::istream is03(if03.rdbuf());

  pos01 = is01.tellg();

  pos02 = is01.tellg();

  pos03 = is02.tellg();

  pos04 = is02.tellg();

  pos05 = is03.tellg();

  pos06 = is03.tellg();

  // istream& seekg(pos_type)

  // istream& seekg(off_type, ios_base::seekdir)

  // cur 

  // NB: see library issues list 136. It's the v-3 interp that seekg

  // only sets the input buffer, or else istreams with buffers that

  // have _M_mode == ios_base::out will fail to have consistency

  // between seekg and tellg.

  state01 = is01.rdstate();

  is01.seekg(10, std::ios_base::cur);

  state02 = is01.rdstate();

  pos01 = is01.tellg();

  VERIFY( pos01 == pos02 + off_type(10) );

  VERIFY( state01 == state02 );

  pos02 = is01.tellg();

  VERIFY( pos02 == pos01 );

  state01 = is02.rdstate();

  is02.seekg(10, std::ios_base::cur);

  state02 = is02.rdstate();

  pos03 = is02.tellg();

  VERIFY( pos03 == pos04 + off_type(10) );

  VERIFY( state01 == state02 );

  pos04 = is02.tellg();

  VERIFY( pos03 == pos04 );

  state01 = is03.rdstate();

  is03.seekg(10, std::ios_base::cur);

  state02 = is03.rdstate();

  pos05 = is03.tellg();

  VERIFY( pos05 == pos06 + off_type(10) );

  VERIFY( state01 == state02 );

  pos06 = is03.tellg();

  VERIFY( pos05 == pos06 );

  // beg

  state01 = is01.rdstate();

  is01.seekg(20, std::ios_base::beg);

  state02 = is01.rdstate();

  pos01 = is01.tellg();

  VERIFY( pos01 == pos02 + off_type(10) );

  VERIFY( state01 == state02 );

  pos02 = is01.tellg();

  VERIFY( pos02 == pos01 );

  state01 = is02.rdstate();

  is02.seekg(20, std::ios_base::beg);

  state02 = is02.rdstate();

  pos03 = is02.tellg();

  VERIFY( pos03 == pos04 + off_type(10) );

  VERIFY( state01 == state02 );

  pos04 = is02.tellg();

  VERIFY( pos03 == pos04 );

  state01 = is03.rdstate();

  is03.seekg(20, std::ios_base::beg);

  state02 = is03.rdstate();

  pos05 = is03.tellg();

  VERIFY( pos05 == pos06 + off_type(10) );

  VERIFY( state01 == state02 );

  pos06 = is03.tellg();

  VERIFY( pos05 == pos06 );

}

int main()

{

  test04();

  return 0;

}