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add dns_name_dup() and dns_name_free()

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This commit is contained in:
Bob Halley 1999-06-12 01:08:16 +00:00
parent e51923a61f
commit 6f5c11ea91
2 changed files with 89 additions and 2 deletions
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42
lib/dns/include/dns/name.h
View file

@ -195,6 +195,7 @@ struct dns_name {
#define DNS_NAMEATTR_ABSOLUTE 0x0001
#define DNS_NAMEATTR_READONLY 0x0002
#define DNS_NAMEATTR_DYNAMIC 0x0004
extern dns_name_t *dns_rootname;
@ -867,6 +868,47 @@ dns_name_split(dns_name_t *name,
* have enough room to receive the split name.
*/
dns_result_t
dns_name_dup(dns_name_t *source, isc_mem_t *mctx, unsigned char *offsets,
dns_name_t *target);
/*
* Make 'target' a dynamically allocated copy of 'source'.
*
* Notes:
*
* 'target' will be initialized.
*
* 'offsets' is never required to be non-NULL, but specifying a
* dns_offsets_t for 'offsets' will improve the performance of most
* name operations if the name is used more than once.
*
* Requires:
*
* 'source' is a valid non-empty name.
*
* 'mctx' is a valid memory context.
*
* offsets == NULL or offsets is a dns_offsets_t.
*
*/
void
dns_name_free(dns_name_t *name, isc_mem_t *mctx);
/*
* Free 'name'.
*
* Requires:
*
* 'name' is a valid name created previously in 'mctx' by dns_name_dup().
*
* 'mctx' is a valid memory context.
*
* Ensures:
*
* All dynamic resources used by 'name' are freed and the name is
* invalidated.
*/
ISC_LANG_ENDDECLS
#endif /* DNS_NAME_H */

49
lib/dns/name.c
View file

@ -33,8 +33,6 @@
#define NAME_MAGIC 0x444E536EU /* DNSn. */
#define VALID_NAME(n) ((n) != NULL && \
(n)->magic == NAME_MAGIC)
isc_buffer_t x;
char xxxx[1024];
typedef enum {
ft_init = 0,
@ -2721,3 +2719,50 @@ dns_name_split(dns_name_t *name,
return (result);
}
dns_result_t
dns_name_dup(dns_name_t *source, isc_mem_t *mctx, unsigned char *offsets,
dns_name_t *target) {
REQUIRE(VALID_NAME(source));
REQUIRE(source->length > 0);
REQUIRE((target->attributes & DNS_NAMEATTR_READONLY) == 0);
/*
* Make 'target' a dynamically allocated copy of 'source'.
*/
target->ndata = isc_mem_get(mctx, source->length);
if (target->ndata == NULL)
return (DNS_R_NOMEMORY);
memcpy(target->ndata, source->ndata, source->length);
target->magic = NAME_MAGIC;
target->length = source->length;
target->labels = source->labels;
target->attributes = DNS_NAMEATTR_DYNAMIC | DNS_NAMEATTR_READONLY;
if ((source->attributes & DNS_NAMEATTR_ABSOLUTE) != 0)
target->attributes |= DNS_NAMEATTR_ABSOLUTE;
target->offsets = offsets;
if (offsets != NULL)
set_offsets(target, target->offsets, ISC_FALSE, ISC_FALSE,
ISC_FALSE);
target->buffer = NULL;
ISC_LINK_INIT(target, link);
ISC_LIST_INIT(target->list);
return (DNS_R_SUCCESS);
}
void
dns_name_free(dns_name_t *name, isc_mem_t *mctx) {
REQUIRE(VALID_NAME(name));
REQUIRE((name->attributes & DNS_NAMEATTR_DYNAMIC) != 0);
/*
* Free 'name'.
*/
isc_mem_put(mctx, name->ndata, name->length);
dns_name_invalidate(name);
}