// Copyright (C) 2019-2022 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
// .
// { dg-do run { target c++17 } }
// { dg-require-filesystem-ts "" }
// C++17 30.10.15.33 Resize file [fs.op.resize_file]
#include
#include
#include
#include
#include
void
test01()
{
auto p = __gnu_test::nonexistent_path();
std::error_code ec;
resize_file(p, 0, ec);
VERIFY( ec );
ec = {};
resize_file(p, 1, ec);
VERIFY( ec );
__gnu_test::scoped_file f(p);
std::ofstream{p} << "some text";
std::ifstream fin;
std::string input;
#ifdef _GLIBCXX_HAVE_TRUNCATE
resize_file(p, 4, ec);
VERIFY( !ec );
fin.open(p);
getline(fin, input);
VERIFY( input.length() == 4 );
fin.close();
resize_file(p, 2);
fin.open(p);
getline(fin, input);
VERIFY( input.length() == 2 );
fin.close();
#endif
resize_file(p, 0, ec);
VERIFY( !ec );
fin.open(p);
getline(fin, input);
VERIFY( input.length() == 0 );
fin.close();
}
int
main()
{
test01();
}