diff options
Diffstat (limited to 'libgo/go/net/dnsclient.go')
| -rw-r--r-- | libgo/go/net/dnsclient.go | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/libgo/go/net/dnsclient.go b/libgo/go/net/dnsclient.go index f4ed8b87cc1..e69cb3188bc 100644 --- a/libgo/go/net/dnsclient.go +++ b/libgo/go/net/dnsclient.go @@ -5,8 +5,6 @@ package net import ( - "bytes" - "fmt" "math/rand" "sort" ) @@ -45,20 +43,22 @@ func reverseaddr(addr string) (arpa string, err error) { return "", &DNSError{Err: "unrecognized address", Name: addr} } if ip.To4() != nil { - return fmt.Sprintf("%d.%d.%d.%d.in-addr.arpa.", ip[15], ip[14], ip[13], ip[12]), nil + return itoa(int(ip[15])) + "." + itoa(int(ip[14])) + "." + itoa(int(ip[13])) + "." + + itoa(int(ip[12])) + ".in-addr.arpa.", nil } // Must be IPv6 - var buf bytes.Buffer + buf := make([]byte, 0, len(ip)*4+len("ip6.arpa.")) // Add it, in reverse, to the buffer for i := len(ip) - 1; i >= 0; i-- { - s := fmt.Sprintf("%02x", ip[i]) - buf.WriteByte(s[1]) - buf.WriteByte('.') - buf.WriteByte(s[0]) - buf.WriteByte('.') + v := ip[i] + buf = append(buf, hexDigit[v&0xF]) + buf = append(buf, '.') + buf = append(buf, hexDigit[v>>4]) + buf = append(buf, '.') } // Append "ip6.arpa." and return (buf already has the final .) - return buf.String() + "ip6.arpa.", nil + buf = append(buf, "ip6.arpa."...) + return string(buf), nil } // Find answer for name in dns message. |