github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/net/ipv6/helper.go (about)

     1  // Copyright 2013 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package ipv6
     6  
     7  import (
     8  	"errors"
     9  	"net"
    10  )
    11  
    12  var (
    13  	errMissingAddress  = errors.New("missing address")
    14  	errHeaderTooShort  = errors.New("header too short")
    15  	errInvalidConnType = errors.New("invalid conn type")
    16  	errOpNoSupport     = errors.New("operation not supported")
    17  	errNoSuchInterface = errors.New("no such interface")
    18  )
    19  
    20  func boolint(b bool) int {
    21  	if b {
    22  		return 1
    23  	}
    24  	return 0
    25  }
    26  
    27  func netAddrToIP16(a net.Addr) net.IP {
    28  	switch v := a.(type) {
    29  	case *net.UDPAddr:
    30  		if ip := v.IP.To16(); ip != nil && ip.To4() == nil {
    31  			return ip
    32  		}
    33  	case *net.IPAddr:
    34  		if ip := v.IP.To16(); ip != nil && ip.To4() == nil {
    35  			return ip
    36  		}
    37  	}
    38  	return nil
    39  }