From: erg <devnull@localhost>
Date: Thu, 8 Nov 2007 21:41:21 +0000 (+0000)
Subject: Change semantics of agnameof() so that NULL is returned for anonymous edges.
X-Git-Tag: LAST_LIBGRAPH~32^2~5049
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=2dcc9bacb34d120cef815eb6c4cc06d82d5da959;p=graphviz

Change semantics of agnameof() so that NULL is returned for anonymous edges.
---

diff --git a/lib/cgraph/id.c b/lib/cgraph/id.c
index 59d031660..3121962ee 100644
--- a/lib/cgraph/id.c
+++ b/lib/cgraph/id.c
@@ -129,6 +129,12 @@ void agfreeid(Agraph_t * g, int objtype, unsigned long id)
     (AGDISC(g, id)->free) (AGCLOS(g, id), objtype, id);
 }
 
+/* agnameof:
+ * Return string representation of object.
+ * In general, returns the name of node or graph,
+ * and the key of an edge. If edge is anonymous, returns NULL.
+ * Uses static buffer for anonymous graphs.
+ */
 char *agnameof(void *obj)
 {
     Agraph_t *g;
@@ -145,9 +151,11 @@ char *agnameof(void *obj)
 	     AGDISC(g, id)->print(AGCLOS(g, id), AGTYPE(obj), AGID(obj))))
 	    return rv;
     }
-    if (AGTYPE(obj) != AGEDGE)
+    if (AGTYPE(obj) != AGEDGE) {
 	sprintf(buf, "%c%ld", LOCALNAMEPREFIX, AGID(obj));
+	rv = buf;
+    }
     else
-	buf[0] = 0;
-    return buf;
+	rv = 0;
+    return rv;
 }