Minor improvements to stringinfo package to make it more

robust, since it's about to get used much more heavily.

src/backend/nodes/outfuncs.c

@@ -5,7 +5,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- *	$Id: outfuncs.c,v 1.94 1999/08/21 03:48:58 tgl Exp $
+ *	$Id: outfuncs.c,v 1.95 1999/08/31 01:28:32 tgl Exp $
  *
  * NOTES
  *	  Every (plan) node in POSTGRES has an associated "out" routine which
@@ -42,6 +42,10 @@
 static void _outDatum(StringInfo str, Datum value, Oid type);
 static void _outNode(StringInfo str, void *obj);
 
+/* Convert a null string pointer into "<>" */
+#define stringStringInfo(s) (((s) == NULL) ? "<>" : (s))
+
+
 /*
  * _outIntList -
  *	   converts a List of integers