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// Copyright 2020 Ant Group. All rights reserved.
// Copyright (C) 2020 Alibaba Cloud. All rights reserved.
//
// SPDX-License-Identifier: Apache-2.0
use nix::sys::stat::dev_t;

// makedev calculations compact with macos
// view https://opensource.apple.com/source/xnu/xnu-201/bsd/sys/types.h.auto.html
pub fn makedev(major: u64, minor: u64) -> dev_t {
    #[cfg(target_os = "linux")]
    {
        nix::sys::stat::makedev(major, minor)
    }
    #[cfg(target_os = "macos")]
    {
        ((major & 0xff << 24) | (minor & 0xffffff)) as dev_t
    }
}

pub fn major_dev(dev: u64) -> u64 {
    #[cfg(target_os = "linux")]
    {
        nix::sys::stat::major(dev)
    }
    #[cfg(target_os = "macos")]
    {
        (dev >> 24) & 0xff
    }
}

pub fn minor_dev(dev: u64) -> u64 {
    #[cfg(target_os = "linux")]
    {
        nix::sys::stat::minor(dev)
    }
    #[cfg(target_os = "macos")]
    {
        dev & 0xffffff
    }
}