var nativeByteOrder binary.ByteOrder

func init() {
	var x uint16 = 0x0102
	lowerByte := *(*byte)(unsafe.Pointer(&x))
	switch lowerByte {
	case 0x01:
		nativeByteOrder = binary.BigEndian
	case 0x02:
		nativeByteOrder = binary.LittleEndian
	default:
		panic("Could not determine native byte order.")
	}
}

// <arpa/inet.h>
func ntohs(n16 uint16) uint16 {
	if nativeByteOrder == binary.BigEndian {
		return n16
	}

const _PAGESIZE = 0x1000

type ureg struct {
	ax  uint64
	bx  uint64
	cx  uint64
	dx  uint64
	si  uint64
	di  uint64
	bp  uint64
	r8  uint64
	r9  uint64
	r10 uint64
	r11 uint64
	r12 uint64
	r13 uint64
	r14 uint64
	r15 uint64

	ds uint16
	es uint16
	fs uint16
	gs uint16

	_type uint64
	error uint64 /* error code (or zero) */
	ip    uint64 /* pc */
	cs    uint64 /* old context */

	t.Run("3", testdiv(3, func(n uint64) (uint64, uint64) { return n / 3, n % 3 }))
	t.Run("4", testdiv(4, func(n uint64) (uint64, uint64) { return n / 4, n % 4 }))
	t.Run("5", testdiv(5, func(n uint64) (uint64, uint64) { return n / 5, n % 5 }))
	t.Run("6", testdiv(6, func(n uint64) (uint64, uint64) { return n / 6, n % 6 }))
	t.Run("7", testdiv(7, func(n uint64) (uint64, uint64) { return n / 7, n % 7 }))

func (token Token) Environ(inheritExisting bool) (env []string, err error) {
	var block *uint16
	err = CreateEnvironmentBlock(&block, token, inheritExisting)
	if err != nil {
		return nil, err
	}
	defer DestroyEnvironmentBlock(block)
	size := unsafe.Sizeof(*block)
	for *block != 0 {
		// find NUL terminator
		end := unsafe.Pointer(block)
		for *(*uint16)(end) != 0 {
			end = unsafe.Add(end, size)
		}

	switch xx := x.(type) {
	default:
		return fmt.Sprint("default ", xx)
	case int, int8, int16, int32:
		return fmt.Sprint("signed ", xx)
	case int64:
		return fmt.Sprint("signed64 ", int64(xx))
	case uint, uint8, uint16, uint32:
		return fmt.Sprint("unsigned ", xx)
	case uint64:
		return fmt.Sprint("unsigned64 ", uint64(xx))
	case nil:
		return fmt.Sprint("nil ", xx)
	}
	panic("not reached")
}

}

func ExampleByteOrder_get() {
	b := []byte{0xe8, 0x03, 0xd0, 0x07}
	x1 := binary.LittleEndian.Uint16(b[0:])
	x2 := binary.LittleEndian.Uint16(b[2:])
	fmt.Printf("%#04x %#04x\n", x1, x2)
	// Output:
	// 0x03e8 0x07d0
}

func ExamplePutUvarint() {
	buf := make([]byte, binary.MaxVarintLen64)

	for _, x := range []uint64{1, 2, 127, 128, 255, 256} {
		n := binary.PutUvarint(buf, x)
		fmt.Printf("%x\n", buf[:n])
	}

	maskx = 0b00111111
	mask3 = 0b00001111

	rune1Max = 1<<7 - 1
	rune2Max = 1<<11 - 1
)

// encodeWTF16 returns the potentially ill-formed
// UTF-16 encoding of s.
func encodeWTF16(s string, buf []uint16) []uint16 {
	for i := 0; i < len(s); {
		// Cannot use 'for range s' because it expects valid
		// UTF-8 runes.
		r, size := utf8.DecodeRuneInString(s[i:])
		if r == utf8.RuneError {

	portev_events int32
	portev_source uint16
	portev_pad    uint16
	portev_object uint64
	portev_user   *byte
}

type pthread uint32
type pthreadattr struct {
	__pthread_attrp *byte
}

type stat struct {
	st_dev     uint64
	st_ino     uint64
	st_mode    uint32
	st_nlink   uint32
	st_uid     uint32
	st_gid     uint32
	st_rdev    uint64
	st_size    int64
	st_atim    timespec

	keyp, err := UTF16PtrFromString(key)
	if err != nil {
		return "", false
	}
	n := uint32(100)
	for {
		b := make([]uint16, n)
		n, err = GetEnvironmentVariable(keyp, &b[0], uint32(len(b)))
		if n == 0 && err == ERROR_ENVVAR_NOT_FOUND {
			return "", false
		}
		if n <= uint32(len(b)) {
			return UTF16ToString(b[:n]), true
		}
	}
}

func Setenv(key, value string) error {

package os

import (
	"internal/syscall/windows"
	"syscall"
)

func getModuleFileName(handle syscall.Handle) (string, error) {
	n := uint32(1024)
	var buf []uint16
	for {
		buf = make([]uint16, n)
		r, err := windows.GetModuleFileName(handle, &buf[0], n)
		if err != nil {
			return "", err
		}
		if r < n {
			break
		}
		// r == n means n not big enough
		n += 1024