From: Joe Tsai <joetsai@digital-static.net>
Date: Thu, 16 Jun 2022 00:35:41 +0000 (-0700)
Subject: internal/poll: rely on utf8.AppendRune
X-Git-Tag: go1.20rc1~1473
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=e0388c92d048fc31b39e133441bd4f6d85959ec4;p=gostls13.git

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>
---

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