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//
// blocking_file_copy.cpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <iostream>
#include <boost/asio.hpp>
#if defined(BOOST_ASIO_HAS_FILE)
int main(int argc, char* argv[])
{
try
{
if (argc != 3)
{
std::cerr << "Usage: blocking_file_copy <from> <to>\n";
return 1;
}
boost::asio::io_context io_context;
boost::asio::stream_file from_file(io_context, argv[1],
boost::asio::stream_file::read_only);
boost::asio::stream_file to_file(io_context, argv[2],
boost::asio::stream_file::write_only
| boost::asio::stream_file::create
| boost::asio::stream_file::truncate);
char data[4096];
boost::system::error_code error;
for (;;)
{
std::size_t n = from_file.read_some(boost::asio::buffer(data), error);
if (error)
break;
boost::asio::write(to_file, boost::asio::buffer(data, n), error);
if (error)
break;
}
if (error && error != boost::asio::error::eof)
{
std::cerr << "Error copying file: " << error.message() << "\n";
return 1;
}
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
return 1;
}
return 0;
}
#else // defined(BOOST_ASIO_HAS_FILE)
int main() {}
#endif // defined(BOOST_ASIO_HAS_FILE)
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