From 6c91dd94959c94ee139e870843f285fcb22fc55c Mon Sep 17 00:00:00 2001
From: Daniel Richard G <skunk@iSKUNK.ORG>
Date: Thu, 1 Aug 2019 15:01:47 +0200
Subject: [PATCH] Don't call printf with NULL string in runtest.c

Avoids undefined behavior causing problems on HP-UX and Solaris.

Closes #78.
---
 runtest.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/runtest.c b/runtest.c
index b1c30d85..13e36a49 100644
--- a/runtest.c
+++ b/runtest.c
@@ -880,6 +880,8 @@ internalSubsetDebug(void *ctx ATTRIBUTE_UNUSED, const xmlChar *name,
     callbacks++;
     if (quiet)
 	return;
+    if (name == NULL)
+        name = BAD_CAST "(null)";
     fprintf(SAXdebug, "SAX.internalSubset(%s,", name);
     if (ExternalID == NULL)
 	fprintf(SAXdebug, " ,");