net: use strings.Builder

Change-Id: I3861a73d6b9d1d454c42bec50099b916bf30f1cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/428266
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: xie cui <523516579@qq.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>

diff --git a/src/net/lookup_test.go b/src/net/lookup_test.go
index 24d4fbf66db8495b20c11911c55772139e55963a..ed9f93f3fe8990184aee2ad1dd475ad1dfe41b9b 100644 (file)
--- a/src/net/lookup_test.go
+++ b/src/net/lookup_test.go
@@ -7,7 +7,6 @@
 package net
 
 import (
-       "bytes"
        "context"
        "fmt"
        "internal/testenv"
@@ -718,7 +717,7 @@ func testDots(t *testing.T, mode string) {
 }
 
 func mxString(mxs []*MX) string {
-       var buf bytes.Buffer
+       var buf strings.Builder
        sep := ""
        fmt.Fprintf(&buf, "[")
        for _, mx := range mxs {
@@ -730,7 +729,7 @@ func mxString(mxs []*MX) string {
 }
 
 func nsString(nss []*NS) string {
-       var buf bytes.Buffer
+       var buf strings.Builder
        sep := ""
        fmt.Fprintf(&buf, "[")
        for _, ns := range nss {
@@ -742,7 +741,7 @@ func nsString(nss []*NS) string {
 }
 
 func srvString(srvs []*SRV) string {
-       var buf bytes.Buffer
+       var buf strings.Builder
        sep := ""
        fmt.Fprintf(&buf, "[")
        for _, srv := range srvs {

diff --git a/src/net/lookup_windows_test.go b/src/net/lookup_windows_test.go
index 20e0a1a8f175adb88b3e9c7ae4d7b49406e2ce58..c618a05bb44e44a22ff2d0382ab58a0a7b8e002b 100644 (file)
--- a/src/net/lookup_windows_test.go
+++ b/src/net/lookup_windows_test.go
@@ -5,7 +5,6 @@
 package net
 
 import (
-       "bytes"
        "context"
        "encoding/json"
        "errors"
@@ -216,8 +215,8 @@ func (s byHost) Less(i, j int) bool { return s[i].Host < s[j].Host }
 func (s byHost) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
 
 func nslookup(qtype, name string) (string, error) {
-       var out bytes.Buffer
-       var err bytes.Buffer
+       var out strings.Builder
+       var err strings.Builder
        cmd := exec.Command("nslookup", "-querytype="+qtype, name)
        cmd.Stdout = &out
        cmd.Stderr = &err