Drop config.go

If you need something to parse /etc/resolv.conf, write it. Core
Go should export more of its dns stuff from net.

Makefile

@@ -10,7 +10,6 @@ GOFILES=\
 	dns.go\
 	msg.go\
 	resolver.go \
-	config.go\
 	types.go\
 
 include $(GOROOT)/src/Make.pkg

config.go

@@ -1,105 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Read system DNS config from /etc/resolv.conf
-// Or any other file with the same format.
-
-package dns
-
-import (
-	"os"
-	"net"
-)
-
-// See resolv.conf(5) on a Linux machine.
-// TODO(rsc): Supposed to call uname() and chop the beginning
-// of the host name to get the default search domain.
-// We assume it's in resolv.conf anyway.
-func ReadConfig(f string) (*Resolver, os.Error) {
-	if f == "" {
-		f = "/etc/resolv.conf"
-	}
-
-	file, err := open(f)
-	if err != nil {
-		return nil, err			// DnsError
-	}
-	r := new(Resolver)
-	r.Servers = make([]string, 3)[0:0] // small, but the standard limit
-	r.Search = make([]string, 0)
-	r.Ndots = 1
-	r.Timeout = 5
-	r.Attempts = 2
-	r.Rotate = false
-	for line, ok := file.readLine(); ok; line, ok = file.readLine() {
-		f := getFields(line)
-		if len(f) < 1 {
-			continue
-		}
-		switch f[0] {
-		case "nameserver": // add one name server
-			a := r.Servers
-			n := len(a)
-			if len(f) > 1 && n < cap(a) {
-				// One more check: make sure server name is
-				// just an IP address.  Otherwise we need DNS
-				// to look it up.
-				name := f[1]
-				switch len(net.ParseIP(name)) {
-				case 16:
-					name = "[" + name + "]"
-					fallthrough
-				case 4:
-					a = a[0 : n+1]
-					a[n] = name
-					r.Servers = a
-				}
-			}
-
-		case "domain": // set search path to just this domain
-			if len(f) > 1 {
-				r.Search = make([]string, 1)
-				r.Search[0] = f[1]
-			} else {
-				r.Search = make([]string, 0)
-			}
-
-		case "search": // set search path to given servers
-			r.Search = make([]string, len(f)-1)
-			for i := 0; i < len(r.Search); i++ {
-				r.Search[i] = f[i+1]
-			}
-
-		case "options": // magic options
-			for i := 1; i < len(f); i++ {
-				s := f[i]
-				switch {
-				case len(s) >= 6 && s[0:6] == "ndots:":
-					n, _, _ := dtoi(s, 6)
-					if n < 1 {
-						n = 1
-					}
-					r.Ndots = n
-				case len(s) >= 8 && s[0:8] == "timeout:":
-					n, _, _ := dtoi(s, 8)
-					if n < 1 {
-						n = 1
-					}
-					r.Timeout = n
-				case len(s) >= 8 && s[0:9] == "attempts:":
-					n, _, _ := dtoi(s, 9)
-					if n < 1 {
-						n = 1
-					}
-					r.Attempts = n
-				case s == "rotate":
-					r.Rotate = true
-				}
-			}
-		}
-	}
-	file.close()
-
-	return r, nil
-}