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libctf, next, hash: add dynhash and dynset _next iteration

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This lets you iterate over dynhashes and dynsets using the _next API.
dynhashes can be iterated over in sorted order, which works by
populating an array of key/value pairs using ctf_dynhash_next itself,
then sorting it with qsort.

Convenience inline functions named ctf_dyn{hash,set}_cnext are also
provided that take (-> return) const keys and values.

libctf/
	* ctf-impl.h (ctf_next_hkv_t): New, kv-pairs passed to
	sorting functions.
	(ctf_next_t) <u.ctn_sorted_hkv>: New, sorted kv-pairs for
	ctf_dynhash_next_sorted.
	<cu.ctn_h>: New, pointer to the dynhash under iteration.
	<cu.ctn_s>: New, pointer to the dynset under iteration.
	(ctf_hash_sort_f): Sorting function passed to...
	(ctf_dynhash_next_sorted): ... this new function.
	(ctf_dynhash_next): New.
	(ctf_dynset_next): New.
	* ctf-inlines.h (ctf_dynhash_cnext_sorted): New.
	(ctf_dynhash_cnext): New.
	(ctf_dynset_cnext): New.
	* ctf-hash.c (ctf_dynhash_next_sorted): New.
	(ctf_dynhash_next): New.
	(ctf_dynset_next): New.
	* ctf-util.c (ctf_next_destroy): Free the u.ctn_sorted_hkv if
	needed.
	(ctf_next_copy): Alloc-and-copy the u.ctn_sorted_hkv if needed.
This commit is contained in:
Nick Alcock 2020-06-03 16:36:18 +01:00
parent 688d28f621
commit e28591b3df
5 changed files with 305 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

17
libctf/ctf-util.c
View file

@ -187,6 +187,11 @@ ctf_next_create (void)
void
ctf_next_destroy (ctf_next_t *i)
{
if (i == NULL)
return;
if (i->ctn_iter_fun == (void (*) (void)) ctf_dynhash_next_sorted)
free (i->u.ctn_sorted_hkv);
free (i);
}
@ -200,5 +205,17 @@ ctf_next_copy (ctf_next_t *i)
if ((i2 = ctf_next_create()) == NULL)
return NULL;
memcpy (i2, i, sizeof (struct ctf_next));
if (i2->ctn_iter_fun == (void (*) (void)) ctf_dynhash_next_sorted)
{
size_t els = ctf_dynhash_elements ((ctf_dynhash_t *) i->cu.ctn_h);
if ((i2->u.ctn_sorted_hkv = calloc (els, sizeof (ctf_next_hkv_t))) == NULL)
{
free (i2);
return NULL;
}
memcpy (i2->u.ctn_sorted_hkv, i->u.ctn_sorted_hkv,
els * sizeof (ctf_next_hkv_t));
}
return i2;
}