===================================================================
RCS file: /cvs/mandoc/term_ascii.c,v
retrieving revision 1.65
retrieving revision 1.66
diff -u -p -r1.65 -r1.66
--- mandoc/term_ascii.c	2020/09/06 14:45:22	1.65
+++ mandoc/term_ascii.c	2020/09/09 13:45:05	1.66
@@ -1,4 +1,4 @@
-/* $Id: term_ascii.c,v 1.65 2020/09/06 14:45:22 schwarze Exp $ */
+/* $Id: term_ascii.c,v 1.66 2020/09/09 13:45:05 schwarze Exp $ */
 /*
  * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2014,2015,2017,2018,2020 Ingo Schwarze <schwarze@openbsd.org>
@@ -245,7 +245,14 @@ ascii_advance(struct termp *p, size_t len)
 {
 	size_t		i;
 
-	assert(len < UINT16_MAX);
+	/*
+	 * XXX We used to have "assert(len < UINT16_MAX)" here.
+	 * that is not quite right because the input document
+	 * can trigger that by merely providing large input.
+	 * For now, simply truncate.
+	 */
+	if (len > 256)
+		len = 256;
 	for (i = 0; i < len; i++)
 		putchar(' ');
 }
@@ -383,7 +390,14 @@ locale_advance(struct termp *p, size_t len)
 {
 	size_t		i;
 
-	assert(len < UINT16_MAX);
+	/*
+	 * XXX We used to have "assert(len < UINT16_MAX)" here.
+	 * that is not quite right because the input document
+	 * can trigger that by merely providing large input.
+	 * For now, simply truncate.
+	 */
+	if (len > 256)
+		len = 256;
 	for (i = 0; i < len; i++)
 		putwchar(L' ');
 }