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https://github.com/golang/go
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519474451a
This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
86 lines
1.9 KiB
Go
86 lines
1.9 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package net
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const hexDigit = "0123456789abcdef"
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// A HardwareAddr represents a physical hardware address.
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type HardwareAddr []byte
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func (a HardwareAddr) String() string {
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if len(a) == 0 {
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return ""
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}
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buf := make([]byte, 0, len(a)*3-1)
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for i, b := range a {
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if i > 0 {
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buf = append(buf, ':')
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}
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buf = append(buf, hexDigit[b>>4])
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buf = append(buf, hexDigit[b&0xF])
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}
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return string(buf)
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}
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// ParseMAC parses s as an IEEE 802 MAC-48, EUI-48, EUI-64, or a 20-octet
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// IP over InfiniBand link-layer address using one of the following formats:
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// 01:23:45:67:89:ab
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// 01:23:45:67:89:ab:cd:ef
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// 01:23:45:67:89:ab:cd:ef:00:00:01:23:45:67:89:ab:cd:ef:00:00
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// 01-23-45-67-89-ab
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// 01-23-45-67-89-ab-cd-ef
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// 01-23-45-67-89-ab-cd-ef-00-00-01-23-45-67-89-ab-cd-ef-00-00
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// 0123.4567.89ab
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// 0123.4567.89ab.cdef
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// 0123.4567.89ab.cdef.0000.0123.4567.89ab.cdef.0000
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func ParseMAC(s string) (hw HardwareAddr, err error) {
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if len(s) < 14 {
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goto error
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}
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if s[2] == ':' || s[2] == '-' {
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if (len(s)+1)%3 != 0 {
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goto error
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}
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n := (len(s) + 1) / 3
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if n != 6 && n != 8 && n != 20 {
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goto error
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}
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hw = make(HardwareAddr, n)
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for x, i := 0, 0; i < n; i++ {
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var ok bool
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if hw[i], ok = xtoi2(s[x:], s[2]); !ok {
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goto error
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}
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x += 3
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}
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} else if s[4] == '.' {
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if (len(s)+1)%5 != 0 {
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goto error
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}
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n := 2 * (len(s) + 1) / 5
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if n != 6 && n != 8 && n != 20 {
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goto error
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}
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hw = make(HardwareAddr, n)
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for x, i := 0, 0; i < n; i += 2 {
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var ok bool
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if hw[i], ok = xtoi2(s[x:x+2], 0); !ok {
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goto error
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}
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if hw[i+1], ok = xtoi2(s[x+2:], s[4]); !ok {
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goto error
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}
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x += 5
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}
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} else {
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goto error
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}
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return hw, nil
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error:
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return nil, &AddrError{Err: "invalid MAC address", Addr: s}
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}
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