diff options
Diffstat (limited to 'src/pkg/net/mac.go')
| -rw-r--r-- | src/pkg/net/mac.go | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/src/pkg/net/mac.go b/src/pkg/net/mac.go index e0637d00b..d616b1f68 100644 --- a/src/pkg/net/mac.go +++ b/src/pkg/net/mac.go @@ -6,24 +6,26 @@ package net -import ( - "bytes" - "errors" - "fmt" -) +import "errors" + +const hexDigit = "0123456789abcdef" // A HardwareAddr represents a physical hardware address. type HardwareAddr []byte func (a HardwareAddr) String() string { - var buf bytes.Buffer + if len(a) == 0 { + return "" + } + buf := make([]byte, 0, len(a)*3-1) for i, b := range a { if i > 0 { - buf.WriteByte(':') + buf = append(buf, ':') } - fmt.Fprintf(&buf, "%02x", b) + buf = append(buf, hexDigit[b>>4]) + buf = append(buf, hexDigit[b&0xF]) } - return buf.String() + return string(buf) } // ParseMAC parses s as an IEEE 802 MAC-48, EUI-48, or EUI-64 using one of the |