===================================================================
RCS file: /cvs/mandoc/mandoc_aux.c,v
retrieving revision 1.10
retrieving revision 1.12
diff -u -p -r1.10 -r1.12
--- mandoc/mandoc_aux.c	2017/06/12 19:05:47	1.10
+++ mandoc/mandoc_aux.c	2022/04/14 16:43:44	1.12
@@ -1,7 +1,7 @@
-/*	$Id: mandoc_aux.c,v 1.10 2017/06/12 19:05:47 schwarze Exp $ */
+/* $Id: mandoc_aux.c,v 1.12 2022/04/14 16:43:44 schwarze Exp $ */
 /*
+ * Copyright (c) 2014, 2015, 2017, 2018 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2009, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2014, 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -27,6 +27,7 @@
 #include <stdio.h>
 #include <string.h>
 
+#define DEBUG_NODEF 1
 #include "mandoc.h"
 #include "mandoc_aux.h"
 
@@ -111,8 +112,8 @@ mandoc_strndup(const char *ptr, size_t sz)
 {
 	char	*p;
 
-	p = mandoc_malloc(sz + 1);
-	memcpy(p, ptr, sz);
-	p[(int)sz] = '\0';
+	p = strndup(ptr, sz);
+	if (p == NULL)
+		err((int)MANDOCLEVEL_SYSERR, NULL);
 	return p;
 }