// Copyright 2017 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// Functions to access/create device major and minor numbers matching the

// encoding used in NetBSD's sys/types.h header.

package unix

// Major returns the major component of a NetBSD device number.

func Major(dev uint64) uint32 {

	return uint32((dev & 0x000fff00) >> 8)

}

// Minor returns the minor component of a NetBSD device number.

func Minor(dev uint64) uint32 {

	minor := uint32((dev & 0x000000ff) >> 0)

	minor |= uint32((dev & 0xfff00000) >> 12)

	return minor

}

// Mkdev returns a NetBSD device number generated from the given major and minor

// components.

func Mkdev(major, minor uint32) uint64 {

	dev := (uint64(major) << 8) & 0x000fff00

	dev |= (uint64(minor) << 12) & 0xfff00000

	dev |= (uint64(minor) << 0) & 0x000000ff

	return dev

}