HelenOS sources

root/uspace/lib/cpp/src/iostream.cpp

/*
 * Copyright (c) 2018 Jaroslav Jindrak
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <__bits/io/streambufs.hpp>
#include <ios>
#include <iostream>
#include <new>

namespace std
{
    istream cin{nullptr};
    ostream cout{nullptr};

    namespace aux
    {
        ios_base::Init init{};
    }

    int ios_base::Init::init_cnt_{};

    ios_base::Init::Init()
    {
        if (init_cnt_++ == 0)
        {
            // TODO: These buffers should be static too
            //       in case somebody reassigns to cout/cin.
            ::new(&cin) istream{::new aux::stdin_streambuf<char>{}};
            ::new(&cout) ostream{::new aux::stdout_streambuf<char>{}};

            cin.tie(&cout);
        }
    }

    ios_base::Init::~Init()
    {
        if (--init_cnt_ == 0)
            cout.flush();
    }
}