From 4ae056b1a3b5cf23916db83027cc1206e07f9b52 Mon Sep 17 00:00:00 2001
From: Jon Siwek <jsiwek@corelight.com>
Date: Thu, 8 Apr 2021 20:13:50 -0700
Subject: [PATCH] Escape non-printables in "unrecognized character" parser
 error messages

---
 src/scan.l | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/scan.l b/src/scan.l
index 5052e7583c..4a7c9f363a 100644
--- a/src/scan.l
+++ b/src/scan.l
@@ -565,7 +565,7 @@ F	RET_CONST(zeek::val_mgr->False()->Ref())
 
 <RE>[\\\n]	return yytext[0];	// should cause a parse error
 
-<*>.	zeek::reporter->Error("unrecognized character - %s", yytext);
+<*>.	zeek::reporter->Error("unrecognized character: '%s'", zeek::util::get_escaped_string(yytext, false).data());
 
 <<EOF>>	last_tok[0] = '\0'; return EOF;