Function copy

src/operations.cpp:2816–3006

}

BOOST_FILESYSTEM_DECL
void copy(path const& from, path const& to, copy_options options, system::error_code* ec)
{
    BOOST_ASSERT((((options & copy_options::overwrite_existing) != copy_options::none) +
        ((options & copy_options::skip_existing) != copy_options::none) +
        ((options & copy_options::update_existing) != copy_options::none)) <= 1);

    BOOST_ASSERT((((options & copy_options::copy_symlinks) != copy_options::none) +
        ((options & copy_options::skip_symlinks) != copy_options::none)) <= 1);

    BOOST_ASSERT((((options & copy_options::directories_only) != copy_options::none) +
        ((options & copy_options::create_symlinks) != copy_options::none) +
        ((options & copy_options::create_hard_links) != copy_options::none)) <= 1);

    if (ec)
        ec->clear();

    file_status from_stat;
    if ((options & (copy_options::copy_symlinks | copy_options::skip_symlinks | copy_options::create_symlinks)) != copy_options::none)
    {
        from_stat = detail::symlink_status_impl(from, ec);
    }
    else
    {
        from_stat = detail::status_impl(from, ec);
    }

    if (ec && *ec)
        return;

    if (!exists(from_stat))
    {
        emit_error(BOOST_ERROR_FILE_NOT_FOUND, from, to, ec, "boost::filesystem::copy");
        return;
    }

    if (is_symlink(from_stat))
    {
        if ((options & copy_options::skip_symlinks) != copy_options::none)
            return;

        if ((options & copy_options::copy_symlinks) == copy_options::none)
            goto fail;

        detail::copy_symlink(from, to, ec);
    }
    else if (is_regular_file(from_stat))
    {
        if ((options & copy_options::directories_only) != copy_options::none)
            return;

        if ((options & copy_options::create_symlinks) != copy_options::none)
        {
            const path* pfrom = &from;
            path relative_from;
            if (!from.is_absolute())
            {
                // Try to generate a relative path from the target location to the original file