From 389c749a5ee18f1c0d6278ae49f2aae5d5f0d2dc Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Tue, 24 Oct 2000 02:03:33 +0000
Subject: [PATCH]  530.   [func]          New function dns_rdata_invalidate().

---
 CHANGES                     |  2 ++
 lib/dns/include/dns/rdata.h | 11 ++++++++++-
 lib/dns/rdata.c             | 14 +++++++++++++-
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/CHANGES b/CHANGES
index 5b6aabe575..a0c557ad4f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,5 @@
+ 530.	[func]		New function dns_rdata_invalidate().
+
  529.	[bug]		521 contained a bug which caused zones to always
 			reload.  [RT #410]
 	
diff --git a/lib/dns/include/dns/rdata.h b/lib/dns/include/dns/rdata.h
index 5ac94c2e49..7ccf967e7f 100644
--- a/lib/dns/include/dns/rdata.h
+++ b/lib/dns/include/dns/rdata.h
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rdata.h,v 1.43 2000/10/20 13:22:36 marka Exp $ */
+/* $Id: rdata.h,v 1.44 2000/10/24 02:03:33 marka Exp $ */
 
 #ifndef DNS_RDATA_H
 #define DNS_RDATA_H 1
@@ -153,6 +153,15 @@ dns_rdata_init(dns_rdata_t *rdata);
  *	'rdata' is a valid rdata (i.e. not NULL, points to a struct dns_rdata)
  */
 
+void
+dns_rdata_invalidate(dns_rdata_t *rdata);
+/*
+ * Make 'rdata' empty.
+ *
+ * Requires:
+ *	'rdata' is a previously initaliased rdata and is not linked.
+ */
+
 void
 dns_rdata_clone(dns_rdata_t *src, dns_rdata_t *target);
 /*
diff --git a/lib/dns/rdata.c b/lib/dns/rdata.c
index 03a09a08a3..23062000e4 100644
--- a/lib/dns/rdata.c
+++ b/lib/dns/rdata.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rdata.c,v 1.111 2000/10/20 13:22:35 marka Exp $ */
+/* $Id: rdata.c,v 1.112 2000/10/24 02:03:32 marka Exp $ */
 
 #include <config.h>
 #include <ctype.h>
@@ -330,6 +330,18 @@ dns_rdata_init(dns_rdata_t *rdata) {
 	/* ISC_LIST_INIT(rdata->list); */
 }
 
+void
+dns_rdata_invalidate(dns_rdata_t *rdata) {
+
+	REQUIRE(!ISC_LINK_LINKED(rdata, link));
+
+	rdata->data = NULL;
+	rdata->length = 0;
+	rdata->rdclass = 0;
+	rdata->type = 0;
+	rdata->flags = 0;
+}
+
 void
 dns_rdata_clone(dns_rdata_t *src, dns_rdata_t *target) {
 	target->data = src->data;