libgo: Update to weekly.2012-03-13.

[pf3gnuchains/gcc-fork.git] / libgo / go / net / dnsclient.go

diff --git a/libgo/go/net/dnsclient.go b/libgo/go/net/dnsclient.go
index f4ed8b8..e69cb31 100644 (file)
--- 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.