path: root/libdevcore/CommonIO.cpp

/*
    This file is part of solidity.

    solidity 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 of the License, or
    (at your option) any later version.

    solidity 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 solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
/** @file CommonIO.cpp
 * @author Gav Wood <i@gavwood.com>
 * @date 2014
 */

#include "CommonIO.h"
#include <iostream>
#include <cstdlib>
#include <fstream>
#include <stdio.h>
#if defined(_WIN32)
#include <windows.h>
#else
#include <unistd.h>
#include <termios.h>
#endif
#include <boost/filesystem.hpp>
#include "Assertions.h"

using namespace std;
using namespace dev;

namespace
{

template <typename _T>
inline _T readFile(std::string const& _file)
{
    _T ret;
    size_t const c_elementSize = sizeof(typename _T::value_type);
    std::ifstream is(_file, std::ifstream::binary);
    if (!is)
        return ret;

    // get length of file:
    is.seekg(0, is.end);
    streamoff length = is.tellg();
    if (length == 0)
        return ret; // do not read empty file (MSVC does not like it)
    is.seekg(0, is.beg);

    ret.resize((length + c_elementSize - 1) / c_elementSize);
    is.read(const_cast<char*>(reinterpret_cast<char const*>(ret.data())), length);
    return ret;
}

}

string dev::readFileAsString(string const& _file)
{
    return readFile<string>(_file);
}

string dev::readStandardInput()
{
    string ret;
    while (!cin.eof())
    {
        string tmp;
        // NOTE: this will read until EOF or NL
        getline(cin, tmp);
        ret.append(tmp);
        ret.append("\n");
    }
    return ret;
}

void dev::writeFile(std::string const& _file, bytesConstRef _data, bool _writeDeleteRename)
{
    namespace fs = boost::filesystem;
    if (_writeDeleteRename)
    {
        fs::path tempPath = fs::unique_path(_file + "-%%%%%%");
        writeFile(tempPath.string(), _data, false);
        // will delete _file if it exists
        fs::rename(tempPath, _file);
    }
    else
    {
        // create directory if not existent
        fs::path p(_file);
        if (!fs::exists(p.parent_path()))
        {
            fs::create_directories(p.parent_path());
            try
            {
                fs::permissions(p.parent_path(), fs::owner_all);
            }
            catch (...)
            {
            }
        }

        ofstream s(_file, ios::trunc | ios::binary);
        s.write(reinterpret_cast<char const*>(_data.data()), _data.size());
        assertThrow(s, FileError, "Could not write to file: " + _file);
        try
        {
            fs::permissions(_file, fs::owner_read|fs::owner_write);
        }
        catch (...)
        {
        }
    }
}

#if defined(_WIN32)
class DisableConsoleBuffering
{
public:
    DisableConsoleBuffering()
    {
        m_stdin = GetStdHandle(STD_INPUT_HANDLE);
        GetConsoleMode(m_stdin, &m_oldMode);
        SetConsoleMode(m_stdin, m_oldMode & (~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT)));
    }
    ~DisableConsoleBuffering()
    {
        SetConsoleMode(m_stdin, m_oldMode);
    }
private:
    HANDLE m_stdin;
    DWORD m_oldMode;
};
#else
class DisableConsoleBuffering
{
public:
    DisableConsoleBuffering()
    {
        tcgetattr(0, &m_termios);
        m_termios.c_lflag &= ~ICANON;
        m_termios.c_lflag &= ~ECHO;
        m_termios.c_cc[VMIN] = 1;
        m_termios.c_cc[VTIME] = 0;
        tcsetattr(0, TCSANOW, &m_termios);
    }
    ~DisableConsoleBuffering()
    {
        m_termios.c_lflag |= ICANON;
        m_termios.c_lflag |= ECHO;
        tcsetattr(0, TCSADRAIN, &m_termios);
    }
private:
    struct termios m_termios;
};
#endif

int dev::readStandardInputChar()
{
    DisableConsoleBuffering disableConsoleBuffering;
    return cin.get();
}

boost::filesystem::path dev::weaklyCanonicalFilesystemPath(boost::filesystem::path const &_path)
{
    if (boost::filesystem::exists(_path))
        return boost::filesystem::canonical(_path);
    else
    {
        boost::filesystem::path head(_path);
        boost::filesystem::path tail;
        for (auto it = --_path.end(); !head.empty(); --it)
        {
            if (boost::filesystem::exists(head))
                break;
            tail = (*it) / tail;
            head.remove_filename();
        }
        head = boost::filesystem::canonical(head);
        return head / tail;
    }
}