From: Emden R. Gansner <erg@emdenrg.net>
Date: Sun, 14 Feb 2016 21:00:21 +0000 (-0500)
Subject: Fix bug in twopi where a node attribute "root" is not defined. This never
X-Git-Tag: TRAVIS_CI_BUILD_EXPERIMENTAL~35
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3e192ddc9cdbd0d64eacd1604b6d57e1c26387fb;p=graphviz

Fix bug in twopi where a node attribute "root" is not defined. This never
worked.
---

diff --git a/lib/twopigen/twopiinit.c b/lib/twopigen/twopiinit.c
index ff9ea1165..341d14085 100644
--- a/lib/twopigen/twopiinit.c
+++ b/lib/twopigen/twopiinit.c
@@ -123,7 +123,7 @@ void twopi_layout(Agraph_t * g)
 	if (ncc == 1) {
 	    if (ctr)
 		lctr = ctr;
-	    else if (!(lctr = findRootNode(g, rootattr)))
+	    else if (!rootattr || !(lctr = findRootNode(g, rootattr)))
 		lctr = 0;
 	    c = circleLayout(g, lctr);
 	    if (setRoot && !ctr)
@@ -144,7 +144,7 @@ void twopi_layout(Agraph_t * g)
 		sg = ccs[i];
 		if (ctr && agcontains(sg, ctr))
 		    lctr = ctr;
-		else if (!(lctr = findRootNode(sg, rootattr)))
+		else if (!rootattr || !(lctr = findRootNode(sg, rootattr)))
 		    lctr = 0;
 		nodeInduce(sg);
 		c = circleLayout(sg, lctr);