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From: Kyle Evans <kevans@FreeBSD.org>
Date: Mon, 20 Aug 2018 22:08:03 +0000 (UTC)
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Subject: svn commit: r338120 - head/usr.sbin/config
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Author: kevans
Date: Mon Aug 20 22:08:03 2018
New Revision: 338120
URL: https://svnweb.freebsd.org/changeset/base/338120

Log:
  config(8): Allow escape-quoted empty strings
  
  For use with things like BOOT_TAG=\"\" -- there are valid reasons to allow
  empty strings, especially as these are usually being passed through as
  options. The same argument could perhaps be made for the unquoted
  variant in things like MODULES_OVERRIDE="", but it's not immediately clear
  that this is an issue so I've left it untouched.
  
  MFC after:	3 days

Modified:
  head/usr.sbin/config/lang.l

Modified: head/usr.sbin/config/lang.l
==============================================================================
--- head/usr.sbin/config/lang.l	Mon Aug 20 21:40:14 2018	(r338119)
+++ head/usr.sbin/config/lang.l	Mon Aug 20 22:08:03 2018	(r338120)
@@ -127,7 +127,7 @@ PATH	[./][-/.%^A-Za-z_0-9]+
 				BEGIN ENVC;
 			return i;
 		}
-\\\"[^"]+\\\"	{
+\\\"[^"]*\\\"	{
 			BEGIN 0;
 			yytext[yyleng-2] = '"';
 			yytext[yyleng-1] = '\0';