diff options
Diffstat (limited to 'lib/dns/rdatalist.c')
| -rw-r--r-- | lib/dns/rdatalist.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/lib/dns/rdatalist.c b/lib/dns/rdatalist.c new file mode 100644 index 00000000..4065857d --- /dev/null +++ b/lib/dns/rdatalist.c @@ -0,0 +1,154 @@ +/* + * 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 <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 (DNS_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 (DNS_R_NOMORE); + + return (DNS_R_SUCCESS); +} + +static isc_result_t +rdatalist_next(dns_rdataset_t *rdataset) { + dns_rdata_t *rdata; + + rdata = rdataset->private2; + if (rdata == NULL) + return (DNS_R_NOMORE); + + rdataset->private2 = ISC_LIST_NEXT(rdata, link); + + if (rdataset->private2 == NULL) + return (DNS_R_NOMORE); + + return (DNS_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); +} |