package net

import (
	"internal/bytealg"
	"sync"
)

var onceReadServices sync.Once

func readServices() {
	file, err := open("/etc/services")
	if err != nil {
		return
	}
	defer file.close()

	for line, ok := file.readLine(); ok; line, ok = file.readLine() {
		// "http 80/tcp www www-http # World Wide Web HTTP"
		if i := bytealg.IndexByteString(line, '#'); i >= 0 {
			line = line[:i]
		}

// Copyright 2023 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.

package bytealg

func LastIndexByte(s []byte, c byte) int {
	for i := len(s) - 1; i >= 0; i-- {
		if s[i] == c {
			return i
		}
	}
	return -1
}

func LastIndexByteString(s string, c byte) int {
	for i := len(s) - 1; i >= 0; i-- {
		if s[i] == c {
			return i
		}

//go:build !386 && (!amd64 || plan9) && !s390x && !arm && !arm64 && !loong64 && !ppc64 && !ppc64le && !mips && !mipsle && !mips64 && !mips64le && !riscv64 && !wasm

package bytealg

func IndexByte(b []byte, c byte) int {
	for i, x := range b {
		if x == c {
			return i
		}
	}
	return -1
}

func IndexByteString(s string, c byte) int {
	for i := 0; i < len(s); i++ {

			}
			var byteLen int
			for shift := uint(0); ; shift += 7 {
				if shift >= 64 {
					return ErrIntOverflowGenerated
				}
				if iNdEx >= l {
					return io.ErrUnexpectedEOF
				}
				b := dAtA[iNdEx]
				iNdEx++
				byteLen |= int(b&0x7F) << shift
				if b < 0x80 {
					break
				}
			}
			if byteLen < 0 {
				return ErrInvalidLengthGenerated
			}

// Copyright 2018 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.

package bytealg

import "unsafe"

// The declarations below generate ABI wrappers for functions
// implemented in assembly in this package but declared in another
// package.

// The compiler generates calls to runtime.memequal and runtime.memequal_varlen.

// Copyright 2018 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.

//go:build amd64 || arm64 || s390x || ppc64le || ppc64

package bytealg

// Index returns the index of the first instance of b in a, or -1 if b is not present in a.
// Requires 2 <= len(b) <= MaxLen.
//
//go:noescape
func Index(a, b []byte) int

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build !windows

// Read system DNS config from /etc/resolv.conf

package net

import (
	"internal/bytealg"
	"internal/stringslite"
	"net/netip"
	"time"
)

// See resolv.conf(5) on a Linux machine.
func dnsReadConfig(filename string) *dnsConfig {
	conf := &dnsConfig{
		ndots:    1,
		timeout:  5 * time.Second,

// Copyright 2011 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.

package net

import (
	"context"
	"errors"
	"internal/bytealg"
	"internal/itoa"
	"internal/stringslite"
	"io"
	"os"
)

// cgoAvailable set to true to indicate that the cgo resolver
// is available on Plan 9. Note that on Plan 9 the cgo resolver

// Copyright 2020 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.

package fs

import (
	"errors"
	"internal/bytealg"
	"slices"
)

// ReadDirFS is the interface implemented by a file system
// that provides an optimized implementation of [ReadDir].
type ReadDirFS interface {
	FS

	// ReadDir reads the named directory

		if !bytes.Equal(g1.Bytes(), newPoint().Bytes()) {
			t.Error("[N - k]G + [k]G != ∞")
		}
	}

	byteLen := len(c.Params().N.Bytes())
	bitLen := c.Params().N.BitLen()
	t.Run("0", func(t *testing.T) { checkScalar(t, make([]byte, byteLen)) })
	t.Run("1", func(t *testing.T) {
		checkScalar(t, big.NewInt(1).FillBytes(make([]byte, byteLen)))
	})
	t.Run("N-1", func(t *testing.T) {