go.mod: update golang.org/x dependencies

Update golang.org/x dependencies to their latest tagged versions.
Once this CL is submitted, and post-submit testing succeeds on all
first-class ports across all supported Go versions, this repository
will be tagged with its next minor version.

Change-Id: I881b6b77e89e8d521940c996e893be72632b4867
Reviewed-on: https://go-review.googlesource.com/c/term/+/448456
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Gopher Robot <gobot@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Gopher Robot <gobot@golang.org>

AUTHORS

@@ -1,3 +0,0 @@
-# This source code refers to The Go Authors for copyright purposes.
-# The master list of authors is in the main Go distribution,
-# visible at http://tip.golang.org/AUTHORS.

CONTRIBUTORS

@@ -1,3 +0,0 @@
-# This source code was written by the Go contributors.
-# The master list of contributors is in the main Go distribution,
-# visible at http://tip.golang.org/CONTRIBUTORS.

codereview.cfg

@@ -0,0 +1 @@
+issuerepo: golang/go

go.mod

@@ -2,4 +2,4 @@ module golang.org/x/term
 
 go 1.17
 
-require golang.org/x/sys v0.0.0-20201119102817-f84b799fce68
+require golang.org/x/sys v0.2.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 h1:nxC68pudNYkKU6jWhgrqdreuFiOQWj1Fs7T3VrH4Pjw=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A=
+golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

term.go

@@ -7,11 +7,13 @@
 //
 // Putting a terminal into raw mode is the most common requirement:
 //
-// 	oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
-// 	if err != nil {
-// 	        panic(err)
-// 	}
-// 	defer term.Restore(int(os.Stdin.Fd()), oldState)
+//	oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
+//	if err != nil {
+//	        panic(err)
+//	}
+//	defer term.Restore(int(os.Stdin.Fd()), oldState)
+//
+// Note that on non-Unix systems os.Stdin.Fd() may not be 0.
 package term
 
 // State contains the state of a terminal.

term_test.go

@@ -5,7 +5,6 @@
 package term_test
 
 import (
-	"io/ioutil"
 	"os"
 	"runtime"
 	"testing"
@@ -14,7 +13,7 @@ import (
 )
 
 func TestIsTerminalTempFile(t *testing.T) {
-	file, err := ioutil.TempFile("", "TestIsTerminalTempFile")
+	file, err := os.CreateTemp("", "TestIsTerminalTempFile")
 	if err != nil {
 		t.Fatal(err)
 	}

terminal.go

@@ -233,7 +233,6 @@ func (t *Terminal) queue(data []rune) {
 	t.outBuf = append(t.outBuf, []byte(string(data))...)
 }
 
-var eraseUnderCursor = []rune{' ', keyEscape, '[', 'D'}
 var space = []rune{' '}
 
 func isPrintable(key rune) bool {
@@ -935,7 +934,7 @@ func (s *stRingBuffer) Add(a string) {
 // next most recent, and so on. If such an element doesn't exist then ok is
 // false.
 func (s *stRingBuffer) NthPreviousEntry(n int) (value string, ok bool) {
-	if n >= s.size {
+	if n < 0 || n >= s.size {
 		return "", false
 	}
 	index := s.head - n

terminal_test.go

@@ -407,7 +407,7 @@ func TestMakeRawState(t *testing.T) {
 		t.Fatalf("failed to get terminal state from GetState: %s", err)
 	}
 
-	if runtime.GOOS == "ios" || (runtime.GOOS == "darwin" && (runtime.GOARCH == "arm" || runtime.GOARCH == "arm64")) {
+	if runtime.GOOS == "ios" {
 		t.Skip("MakeRaw not allowed on iOS; skipping test")
 	}