From e0388c92d048fc31b39e133441bd4f6d85959ec4 Mon Sep 17 00:00:00 2001
From: Joe Tsai <joetsai@digital-static.net>
Date: Wed, 15 Jun 2022 17:35:41 -0700
Subject: [PATCH] internal/poll: rely on utf8.AppendRune

This is both simpler and more performant.

Change-Id: I398de29230e578fb7caf1765df7b8fe84d4e8876
Reviewed-on: https://go-review.googlesource.com/c/go/+/412336
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Ian Lance Taylor <iant@google.com>
---
 src/internal/poll/fd_windows.go | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/internal/poll/fd_windows.go b/src/internal/poll/fd_windows.go
index 1ca281b2a4..1af2011f94 100644
--- a/src/internal/poll/fd_windows.go
+++ b/src/internal/poll/fd_windows.go
@@ -500,8 +500,7 @@ func (fd *FD) readConsole(b []byte) (int, error) {
 					}
 				}
 			}
-			n := utf8.EncodeRune(buf[len(buf):cap(buf)], r)
-			buf = buf[:len(buf)+n]
+			buf = utf8.AppendRune(buf, r)
 		}
 		fd.readbyte = buf
 		fd.readbyteOffset = 0
-- 
2.50.0