From d03f6f66493d8a8a80810f51fb363dfb7bcd02a5 Mon Sep 17 00:00:00 2001
From: "Arnold D. Robbins" <arnold@skeeve.com>
Date: Sun, 16 Nov 2014 19:43:58 +0200
Subject: Sync dfa with grep.

---
 dfa.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'dfa.c')

diff --git a/dfa.c b/dfa.c
index 53a8c2cc..66136ce2 100644
--- a/dfa.c
+++ b/dfa.c
@@ -3697,8 +3697,11 @@ dfassbuild (struct dfa *d)
   sup->musts = NULL;
 
   sup->charclasses = xnmalloc (sup->calloc, sizeof *sup->charclasses);
-  memcpy (sup->charclasses, d->charclasses,
-          d->cindex * sizeof *sup->charclasses);
+  if (d->cindex)
+    {
+      memcpy (sup->charclasses, d->charclasses,
+              d->cindex * sizeof *sup->charclasses);
+    }
 
   sup->tokens = xnmalloc (d->tindex, 2 * sizeof *sup->tokens);
   sup->talloc = d->tindex * 2;
-- 
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