void
isc_symtab_destroy(isc_symtab_t **symtabp) {
isc_symtab_t *symtab;
unsigned int i;
elt_t *elt, *nelt;
REQUIRE(symtabp != NULL);
symtab = *symtabp;
REQUIRE(VALID_SYMTAB(symtab));
for (i = 0; i < symtab->size; i++) {
for (elt = HEAD(symtab->table[i]); elt != NULL; elt = nelt) {
nelt = NEXT(elt, link);
if (symtab->undefine_action != NULL)
(symtab->undefine_action)(elt->key,
elt->type,
elt->value,
symtab->undefine_arg);
isc_mem_put(symtab->mctx, elt, sizeof(*elt));
}
}
isc_mem_put(symtab->mctx, symtab->table,
symtab->size * sizeof(eltlist_t));
symtab->magic = 0;
isc_mem_put(symtab->mctx, symtab, sizeof(*symtab));
*symtabp = NULL;
}
isc_result_t
isc_symtab_define(isc_symtab_t *symtab, const char *key, unsigned int type,
isc_symvalue_t value, isc_symexists_t exists_policy)
{
unsigned int bucket;
elt_t *elt;
REQUIRE(VALID_SYMTAB(symtab));
REQUIRE(key != NULL);
REQUIRE(type != 0);
FIND(symtab, key, type, bucket, elt);
if (exists_policy != isc_symexists_add && elt != NULL) {
if (exists_policy == isc_symexists_reject)
return (ISC_R_EXISTS);
INSIST(exists_policy == isc_symexists_replace);
UNLINK(symtab->table[bucket], elt, link);
if (symtab->undefine_action != NULL)
(symtab->undefine_action)(elt->key, elt->type,
elt->value,
symtab->undefine_arg);
} else {
elt = (elt_t *)isc_mem_get(symtab->mctx, sizeof(*elt));
if (elt == NULL)
return (ISC_R_NOMEMORY);
ISC_LINK_INIT(elt, link);
symtab->count++;
}
/*
* Though the "key" can be const coming in, it is not stored as const
* so that the calling program can easily have writable access to
* it in its undefine_action function. In the event that it *was*
* truly const coming in and then the caller modified it anyway ...
* well, don't do that!
*/
DE_CONST(key, elt->key);
elt->type = type;
elt->value = value;
/*
* We prepend so that the most recent definition will be found.
*/
PREPEND(symtab->table[bucket], elt, link);
if (symtab->count > symtab->maxload)
grow_table(symtab);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_symtab_lookup(isc_symtab_t *symtab, const char *key, unsigned int type,
isc_symvalue_t *value)
{
unsigned int bucket;
elt_t *elt;
REQUIRE(VALID_SYMTAB(symtab));
REQUIRE(key != NULL);
FIND(symtab, key, type, bucket, elt);
if (elt == NULL)
return (ISC_R_NOTFOUND);
if (value != NULL)
*value = elt->value;
return (ISC_R_SUCCESS);
}
isc_result_t
isc_symtab_undefine(isc_symtab_t *symtab, const char *key, unsigned int type) {
unsigned int bucket;
elt_t *elt;
REQUIRE(VALID_SYMTAB(symtab));
REQUIRE(key != NULL);
FIND(symtab, key, type, bucket, elt);
if (elt == NULL)
return (ISC_R_NOTFOUND);
if (symtab->undefine_action != NULL)
(symtab->undefine_action)(elt->key, elt->type,
elt->value, symtab->undefine_arg);
UNLINK(symtab->table[bucket], elt, link);
isc_mem_put(symtab->mctx, elt, sizeof(*elt));
return (ISC_R_SUCCESS);
}
unsigned int
isc_symtab_count(isc_symtab_t *symtab) {
REQUIRE(VALID_SYMTAB(symtab));
return (symtab->count);
}