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

//go:build unix || js || wasip1

package net

import "syscall"

func isConnError(err error) bool {
	if se, ok := err.(syscall.Errno); ok {
		return se == syscall.ECONNRESET || se == syscall.ECONNABORTED
	}
	return false

			// some systems (problem seen on Darwin,
			// Dragonfly, OpenBSD) the fork call will fail
			// with EAGAIN.
			if pe, ok := err.(*os.PathError); ok {
				err = pe.Err
			}
			if se, ok := err.(syscall.Errno); ok && (se == syscall.EAGAIN || se == syscall.EMFILE) {
				time.Sleep(time.Millisecond)
				continue
			}

			t.Error(err)
			return
		}
		cmds = append(cmds, cmd)
	}

	failures := 0

	// are no more pre-opens.
	for preopenFd := uintptr(3); ; preopenFd++ {
		f := os.NewFile(preopenFd, "")
		l, err := net.FileListener(f)
		f.Close()

		var se syscall.Errno
		switch errors.As(err, &se); se {
		case syscall.ENOTSOCK:
			continue
		case syscall.EBADF:
			err = nil
		}
		return l, err
	}

}

type direction int

const (
	north direction = iota
	ne
	east
	se
	south
	sw
	west
	nw
	up
	down
)

func (dir direction) String() string {
	strs := map[direction]string{
		north: "north",
		ne:    "ne",
		east:  "east",
		se:    "se",
		south: "south",
		sw:    "sw",
		west:  "west",
		nw:    "nw",
		up:    "up",
		down:  "down",

		{in: "foo bar  \n", want: "foo bar =20\r\n", wantB: "foo bar  =0A"},
		{in: "foo bar  \n ", want: "foo bar =20\r\n=20", wantB: "foo bar  =0A=20"},
		{in: "¡Hola Señor!", want: "=C2=A1Hola Se=C3=B1or!"},
		{
			in:   "\t !\"#$%&'()*+,-./ :;<>?@[\\]^_`{|}~",
			want: "\t !\"#$%&'()*+,-./ :;<>?@[\\]^_`{|}~",
		},
		{
			in:   strings.Repeat("a", 75),
			want: strings.Repeat("a", 75),
		},
		{