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libctf: add hash traversal helpers

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There are two, ctf_dynhash_iter and ctf_dynhash_iter_remove: the latter
lets you return a nonzero value to remove the element being iterated
over.

Used in the next commit.

libctf/
	* ctf-impl.h (ctf_hash_iter_f): New.
	(ctf_dynhash_iter): New declaration.
	(ctf_dynhash_iter_remove): New declaration.
	* ctf-hash.c (ctf_dynhash_iter): Define.
	(ctf_dynhash_iter_remove): Likewise.
	(ctf_hashtab_traverse): New.
	(ctf_hashtab_traverse_remove): Likewise.
	(struct ctf_traverse_cb_arg): Likewise.
	(struct ctf_traverse_remove_cb_arg): Likewise.
This commit is contained in:
Nick Alcock
2019-06-27 13:30:22 +01:00
parent 3e10cffc98
commit 9658dc3963
3 changed files with 67 additions and 0 deletions
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49
libctf/ctf-hash.c
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@@ -193,6 +193,55 @@ ctf_dynhash_lookup (ctf_dynhash_t *hp, const void *key)
return NULL;
}
typedef struct ctf_traverse_cb_arg
{
ctf_hash_iter_f fun;
void *arg;
} ctf_traverse_cb_arg_t;
static int
ctf_hashtab_traverse (void **slot, void *arg_)
{
ctf_helem_t *helem = *((ctf_helem_t **) slot);
ctf_traverse_cb_arg_t *arg = (ctf_traverse_cb_arg_t *) arg_;
arg->fun (helem->key, helem->value, arg->arg);
return 1;
}
void
ctf_dynhash_iter (ctf_dynhash_t *hp, ctf_hash_iter_f fun, void *arg_)
{
ctf_traverse_cb_arg_t arg = { fun, arg_ };
htab_traverse (hp->htab, ctf_hashtab_traverse, &arg);
}
typedef struct ctf_traverse_remove_cb_arg
{
struct htab *htab;
ctf_hash_iter_remove_f fun;
void *arg;
} ctf_traverse_remove_cb_arg_t;
static int
ctf_hashtab_traverse_remove (void **slot, void *arg_)
{
ctf_helem_t *helem = *((ctf_helem_t **) slot);
ctf_traverse_remove_cb_arg_t *arg = (ctf_traverse_remove_cb_arg_t *) arg_;
if (arg->fun (helem->key, helem->value, arg->arg))
htab_clear_slot (arg->htab, slot);
return 1;
}
void
ctf_dynhash_iter_remove (ctf_dynhash_t *hp, ctf_hash_iter_remove_f fun,
void *arg_)
{
ctf_traverse_remove_cb_arg_t arg = { hp->htab, fun, arg_ };
htab_traverse (hp->htab, ctf_hashtab_traverse_remove, &arg);
}
void
ctf_dynhash_destroy (ctf_dynhash_t *hp)
{