From c99f320d5c0fd98fe88d9cea5407eb7ad9d50e8a Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Mon, 4 Apr 2022 23:52:49 -0700
Subject: zgrep: port to POSIX sed
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* zgrep.in (res): When escaping the file name do not rely on GNU
sed’s extension to POSIX with respect to s/.../\n/.  Instead, use
features that should also work with AIX and/or Solaris sed.  This is
simpler anyway, and would have prevented the recently-fixed bug.
---
 zgrep.in | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/zgrep.in b/zgrep.in
index bdf7da2..6a16dd1 100644
--- a/zgrep.in
+++ b/zgrep.in
@@ -220,18 +220,11 @@ do
       case $i in
       (*'
 '* | *'&'* | *'\'* | *'|'*)
-        i=$(printf '%s\n' "$i" |
-            sed '
-              :start
-              $!{
-                N
-                b start
-              }
-              s/[&\|]/\\&/g
-              s/\n/\\n/g
-            ');;
+          icolon=$(printf '%s\n' "$i:" |
+                     sed -e 's/[&\|]/\\&/g' -e '$!s/$/\\/');;
+      (*) icolon="$i:";;
       esac
-      sed_script="s|^|$i:|"
+      sed_script="s|^|$icolon|"
 
       # Fail if grep or sed fails.
       r=$(
-- 
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