Do not use printf(3) %n.

Index: editor/shell.c
--- editor/shell.c.orig
+++ editor/shell.c
@@ -928,7 +928,7 @@ static void save_scripts (void)
 	for (r = t; *r; r++)
 	    if (*r == '\n')
 		*r = 129;	/* replace newlines with 129 */
-	sprintf (p, "%s\n%s\n%c\n%d\n%d\n%s\n%d\n%s\n%s\n%n",
+	n = sprintf (p, "%s\n%s\n%c\n%d\n%d\n%s\n%d\n%s\n%s\n",
 		 scripts[i]->name ? scripts[i]->name : 0,
 		 scripts[i]->menu ? scripts[i]->menu : 0,
 	       scripts[i]->menu_hot_key ? scripts[i]->menu_hot_key : ' ',
@@ -937,7 +937,7 @@ static void save_scripts (void)
 		 scripts[i]->prompt ? scripts[i]->prompt : "",
 		 (int) scripts[i]->options,
 		 scripts[i]->last_options ? scripts[i]->last_options : "",
-		 t, &n);
+		 t);
 	free (t);
 	p += n;
 	i++;