/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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 <AK/StringView.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Process.h>

namespace Kernel {

KResultOr<int> Process::sys$link(Userspace<const Syscall::SC_link_params*> user_params)
{
    REQUIRE_PROMISE(cpath);
    Syscall::SC_link_params params;
    if (!copy_from_user(&params, user_params))
        return EFAULT;
    auto old_path = copy_string_from_user(params.old_path);
    if (old_path.is_null())
        return EFAULT;
    auto new_path = copy_string_from_user(params.new_path);
    if (new_path.is_null())
        return EFAULT;
    return VFS::the().link(old_path, new_path, current_directory());
}

KResultOr<int> Process::sys$symlink(Userspace<const Syscall::SC_symlink_params*> user_params)
{
    REQUIRE_PROMISE(cpath);
    Syscall::SC_symlink_params params;
    if (!copy_from_user(&params, user_params))
        return EFAULT;
    auto target = get_syscall_path_argument(params.target);
    if (target.is_error())
        return target.error();
    auto linkpath = get_syscall_path_argument(params.linkpath);
    if (linkpath.is_error())
        return linkpath.error();
    return VFS::the().symlink(target.value(), linkpath.value(), current_directory());
}

}