From 51a2418f38fb285c57da238a2ba523c6f6684a9a Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Thu, 22 Feb 2024 22:03:50 +0100
Subject: [PATCH] net: use bytealg.IndexByte in cgoLookupAddrPTR

Change-Id: I76f4dc1e8bda98936c1198cb45ce8141ca88845b
Reviewed-on: https://go-review.googlesource.com/c/go/+/566235
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
---
 src/net/cgo_unix.go | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/net/cgo_unix.go b/src/net/cgo_unix.go
index 82ec4441fc..0f62fdeb11 100644
--- a/src/net/cgo_unix.go
+++ b/src/net/cgo_unix.go
@@ -14,6 +14,7 @@ package net
 import (
 	"context"
 	"errors"
+	"internal/bytealg"
 	"net/netip"
 	"syscall"
 	"unsafe"
@@ -287,11 +288,8 @@ func cgoLookupAddrPTR(addr string, sa *_C_struct_sockaddr, salen _C_socklen_t) (
 		}
 		return nil, &DNSError{Err: err.Error(), Name: addr, IsTemporary: isTemporary, IsNotFound: isErrorNoSuchHost}
 	}
-	for i := 0; i < len(b); i++ {
-		if b[i] == 0 {
-			b = b[:i]
-			break
-		}
+	if i := bytealg.IndexByte(b, 0); i != -1 {
+		b = b[:i]
 	}
 	return []string{absDomainName(string(b))}, nil
 }
-- 
2.50.0