Update RunGrepTest to use tr for handling binary zeros instead of sed, which it

is hoped with increase portability. Bugzilla #2681.

ChangeLog

@@ -1,8 +1,17 @@
 Change Log for PCRE2
 --------------------
 
-Version 10.36-RC1 04-December-2020
-----------------------------------
+Version 10.37-RC1 04-January-2021
+---------------------------------
+
+1. Change RunGrepTest to use tr instead of sed when testing with binary 
+zero bytes, because sed varies a lot from system to system and has problems 
+with binary zeros. This is from Bugzilla #2681. Patch from Jeremie 
+Courreges-Anglas via Nam Nguyen. This fixes RunGrepTest for OpenBSD.
+
+
+Version 10.36 04-December-2020
+------------------------------
 
 1. Add CET_CFLAGS so that when Intel CET is enabled, pass -mshstk to
 compiler. This fixes https://bugs.exim.org/show_bug.cgi?id=2578. Patch for

RunGrepTest

@@ -763,14 +763,9 @@ $valgrind $vjs $pcre2grep -n --newline=anycrlf "^(abc|def|ghi|jkl)" testNinputgr
 # doesn't.
 
 printf '%c--------------------------- Test N7 ------------------------------\r\n' - >>testtrygrep
-Z=`printf '\0' | sed 's/\x00/Z/g'`
-if [ "$Z" = "Z" ]; then
-  printf 'abc\0def' >testNinputgrep
-  $valgrind $vjs $pcre2grep -na --newline=nul "^(abc|def)" testNinputgrep | sed 's/\x00/ZERO/g' >>testtrygrep
-  echo "" >>testtrygrep
-else
-  echo '1:abcZERO2:defZERO' >>testtrygrep
-fi
+printf 'abc\0def' >testNinputgrep
+$valgrind $vjs $pcre2grep -na --newline=nul "^(abc|def)" testNinputgrep | tr '\000' '@' >>testtrygrep
+echo "" >>testtrygrep
 
 $cf $srcdir/testdata/grepoutputN testtrygrep
 if [ $? != 0 ] ; then exit 1; fi

testdata/grepoutputN

@@ -18,4 +18,4 @@ jkl
 3:ghi
 4:jkl
 ---------------------------- Test N7 ------------------------------
-1:abcZERO2:defZERO
+1:abc@2:def@