ceph/src/boost/libs/asio/example/cpp11/files/blocking_file_copy.cpp

   1 //
   2 // blocking_file_copy.cpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include <iostream>
  12 #include <boost/asio.hpp>
  13
  14 #if defined(BOOST_ASIO_HAS_FILE)
  15
  16 int main(int argc, char* argv[])
  17 {
  18   try
  19   {
  20     if (argc != 3)
  21     {
  22       std::cerr << "Usage: blocking_file_copy <from> <to>\n";
  23       return 1;
  24     }
  25
  26     boost::asio::io_context io_context;
  27
  28     boost::asio::stream_file from_file(io_context, argv[1],
  29         boost::asio::stream_file::read_only);
  30
  31     boost::asio::stream_file to_file(io_context, argv[2],
  32         boost::asio::stream_file::write_only
  33           | boost::asio::stream_file::create
  34           | boost::asio::stream_file::truncate);
  35
  36     char data[4096];
  37     boost::system::error_code error;
  38     for (;;)
  39     {
  40       std::size_t n = from_file.read_some(boost::asio::buffer(data), error);
  41       if (error)
  42         break;
  43       boost::asio::write(to_file, boost::asio::buffer(data, n), error);
  44       if (error)
  45         break;
  46     }
  47
  48     if (error && error != boost::asio::error::eof)
  49     {
  50       std::cerr << "Error copying file: " << error.message() << "\n";
  51       return 1;
  52     }
  53   }
  54   catch (std::exception& e)
  55   {
  56     std::cerr << "Exception: " << e.what() << "\n";
  57     return 1;
  58   }
  59
  60   return 0;
  61 }
  62
  63 #else // defined(BOOST_ASIO_HAS_FILE)
  64 int main() {}
  65 #endif // defined(BOOST_ASIO_HAS_FILE)