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// 2000-06-29 bkoz
// Copyright (C) 2000-2015 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/>.
// 27.6.1.3 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>
// stringstreams
void test05(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.tst";
std::ifstream if01(str_lit01);
std::ifstream if02(str_lit01);
std::ifstream if03(str_lit01);
VERIFY( if01.good() );
VERIFY( if02.good() );
VERIFY( if03.good() );
std::stringbuf strbuf01(std::ios_base::in | std::ios_base::out);
if01 >> &strbuf01;
// initialize stringbufs that are ios_base::out
std::stringbuf strbuf03(strbuf01.str(), std::ios_base::out);
// initialize stringbufs that are ios_base::in
std::stringbuf strbuf02(strbuf01.str(), std::ios_base::in);
std::istream is01(&strbuf01);
std::istream is02(&strbuf02);
std::istream is03(&strbuf03);
// pos_type tellg()
// in | out
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 ); // as only out buffer
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 ); // as only out buffer
VERIFY( state01 == state02 );
pos06 = is03.tellg();
VERIFY( pos05 == pos06 );
}
int main()
{
test05();
return 0;
}
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