rdatalist.c revision 364a82f7c25b62967678027043425201a5e5171a
/*
* Copyright (C) 1999, 2000 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#include <stddef.h>
#include <isc/assertions.h>
#include <isc/util.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
static void rdatalist_disassociate(dns_rdataset_t *rdatasetp);
static isc_result_t rdatalist_first(dns_rdataset_t *rdataset);
static isc_result_t rdatalist_next(dns_rdataset_t *rdataset);
static void rdatalist_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata);
static void rdatalist_clone(dns_rdataset_t *source, dns_rdataset_t *target);
static unsigned int rdatalist_count(dns_rdataset_t *rdataset);
static dns_rdatasetmethods_t methods = {
rdatalist_disassociate,
rdatalist_first,
rdatalist_next,
rdatalist_current,
rdatalist_clone,
rdatalist_count
};
void
dns_rdatalist_init(dns_rdatalist_t *rdatalist) {
/*
* Initialize rdatalist.
*/
rdatalist->rdclass = 0;
rdatalist->type = 0;
rdatalist->covers = 0;
rdatalist->ttl = 0;
ISC_LIST_INIT(rdatalist->rdata);
ISC_LINK_INIT(rdatalist, link);
}
isc_result_t
dns_rdatalist_tordataset(dns_rdatalist_t *rdatalist,
dns_rdataset_t *rdataset) {
/*
* Make 'rdataset' refer to the rdata in 'rdatalist'.
*/
REQUIRE(rdatalist != NULL);
REQUIRE(DNS_RDATASET_VALID(rdataset));
REQUIRE(rdataset->methods == NULL);
rdataset->methods = &methods;
rdataset->rdclass = rdatalist->rdclass;
rdataset->type = rdatalist->type;
rdataset->covers = rdatalist->covers;
rdataset->ttl = rdatalist->ttl;
rdataset->trust = 0;
rdataset->private1 = rdatalist;
rdataset->private2 = NULL;
rdataset->private3 = NULL;
rdataset->private4 = NULL;
rdataset->private5 = NULL;
return (ISC_R_SUCCESS);
}
static void
rdatalist_disassociate(dns_rdataset_t *rdataset) {
(void)rdataset; /* Keep compiler quiet. */
}
static isc_result_t
rdatalist_first(dns_rdataset_t *rdataset) {
dns_rdatalist_t *rdatalist;
rdatalist = rdataset->private1;
rdataset->private2 = ISC_LIST_HEAD(rdatalist->rdata);
if (rdataset->private2 == NULL)
return (ISC_R_NOMORE);
return (ISC_R_SUCCESS);
}
static isc_result_t
rdatalist_next(dns_rdataset_t *rdataset) {
dns_rdata_t *rdata;
rdata = rdataset->private2;
if (rdata == NULL)
return (ISC_R_NOMORE);
rdataset->private2 = ISC_LIST_NEXT(rdata, link);
if (rdataset->private2 == NULL)
return (ISC_R_NOMORE);
return (ISC_R_SUCCESS);
}
static void
rdatalist_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
dns_rdata_t *list_rdata;
list_rdata = rdataset->private2;
INSIST(list_rdata != NULL);
*rdata = *list_rdata;
ISC_LINK_INIT(rdata, link);
}
static void
rdatalist_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
*target = *source;
/*
* Reset iterator state.
*/
target->private2 = NULL;
}
static unsigned int
rdatalist_count(dns_rdataset_t *rdataset) {
dns_rdatalist_t *rdatalist;
dns_rdata_t *rdata;
unsigned int count;
rdatalist = rdataset->private1;
count = 0;
for (rdata = ISC_LIST_HEAD(rdatalist->rdata);
rdata != NULL;
rdata = ISC_LIST_NEXT(rdata, link))
count++;
return (count);
}