From fcd4e90ea7b45bf290cd68296a568e673fc34498 Mon Sep 17 00:00:00 2001
From: Jim Derry <balthisar@gmail.com>
Date: Sun, 19 Nov 2017 12:54:08 -0500
Subject: [PATCH] Fix issue where console app and API can't set an FPI for a
 doctype without providing a quoted string. This is especially painful in a
 terminal, which requires escaping quotes. Since all FPI's must start with +
 or -, this fixes the issue.

---
 src/config.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/config.c b/src/config.c
index 084a0c6..0174311 100644
--- a/src/config.c
+++ b/src/config.c
@@ -1620,7 +1620,7 @@ Bool ParseDocType( TidyDocImpl* doc, const TidyOptionImpl* option )
 
     /* "-//ACME//DTD HTML 3.14159//EN" or similar */
 
-    if ( c == '"' || c == '\'' )
+    if ( c == '"' || c == '\''|| c == '-' || c == '+' )
     {
         status = ParseString(doc, option);
         if (status)