From: erg <devnull@localhost>
Date: Mon, 30 Mar 2009 17:31:42 +0000 (+0000)
Subject: Fix bug in agnxtedge; the agnxtin branch wasn't checking for NULL return.
X-Git-Tag: LAST_LIBGRAPH~32^2~2222
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=6790a828a237b265f08700848ae1fcaa05b5e00a;p=graphviz

Fix bug in agnxtedge; the agnxtin branch wasn't checking for NULL return.
---

diff --git a/lib/cgraph/edge.c b/lib/cgraph/edge.c
index 127cedab8..55450305f 100644
--- a/lib/cgraph/edge.c
+++ b/lib/cgraph/edge.c
@@ -91,15 +91,15 @@ Agedge_t *agnxtedge(Agraph_t * g, Agedge_t * e, Agnode_t * n)
 {
     Agedge_t *rv;
 
-	if (AGTYPE(e) == AGOUTEDGE) {
-		rv = agnxtout(g, e);
-		if (rv == NILedge)
-			rv = agfstin(g, n);
+    if (AGTYPE(e) == AGOUTEDGE) {
+	rv = agnxtout(g, e);
+	if (rv == NILedge)
+	    rv = agfstin(g, n);
     } else {
-		do {
-			rv = agnxtin(g, e);		/* so that we only see each edge once, */
-		} while (rv->node == n);	/* ignore loops as in-edges */
-	}
+	do {
+	    rv = agnxtin(g, e);		/* so that we only see each edge once, */
+	} while (rv && (rv->node == n));	/* ignore loops as in-edges */
+    }
     return rv;
 }