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add dns_name_clone()

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This commit is contained in:
Bob Halley 1999-04-24 02:03:07 +00:00
parent 3c8379de2e
commit bd53af8229
2 changed files with 52 additions and 0 deletions
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27
lib/dns/include/dns/name.h
View File

@ -501,6 +501,33 @@ void dns_name_getlabelsequence(dns_name_t *source,
* first + n <= dns_label_countlabels(name)
*/
void
dns_name_clone(dns_name_t *source, dns_name_t *target);
/*
* Make 'target' refer to the same name as 'source'.
*
* Notes:
*
* 'target' refers to the same memory as 'source', so 'source'
* must not be changed while 'target' is still in use.
*
* This call is functionally equivalent to:
*
* dns_name_getlabelsequence(source, 0,
* dns_label_countlabels(source),
* target);
*
* but is more efficient. Also, dns_name_clone() works even if 'source'
* is empty.
*
* Requires:
*
* 'source' is a valid name.
*
* 'target' is a valid name that is not read-only.
*/
/***
*** Conversions
***/

25
lib/dns/name.c
View File

@ -777,6 +777,31 @@ dns_name_getlabelsequence(dns_name_t *source,
ISC_FALSE);
}
void
dns_name_clone(dns_name_t *source, dns_name_t *target) {
/*
* Make 'target' refer to the same name as 'source'.
*/
REQUIRE(VALID_NAME(source));
REQUIRE(VALID_NAME(target));
REQUIRE((target->attributes & DNS_NAMEATTR_READONLY) == 0);
target->ndata = source->ndata;
target->length = source->length;
target->labels = source->labels;
target->attributes = source->attributes;
if (target->offsets != NULL && source->labels > 0) {
if (source->offsets != NULL)
memcpy(target->offsets, source->offsets,
source->labels);
else
set_offsets(target, target->offsets, ISC_FALSE,
ISC_FALSE, ISC_FALSE);
}
}
void
dns_name_fromregion(dns_name_t *name, isc_region_t *r) {
unsigned char *offsets;