+++ /dev/null
- /*
- Trivial Database 2: traverse function.
- Copyright (C) Rusty Russell 2010
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 3 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, see <http://www.gnu.org/licenses/>.
-*/
-#include "private.h"
-#include <ccan/likely/likely.h>
-
-_PUBLIC_ int64_t ntdb_traverse_(struct ntdb_context *ntdb,
- int (*fn)(struct ntdb_context *,
- NTDB_DATA, NTDB_DATA, void *),
- void *p)
-{
- enum NTDB_ERROR ecode;
- struct hash_info h;
- NTDB_DATA k, d;
- int64_t count = 0;
-
- k.dptr = NULL;
- for (ecode = first_in_hash(ntdb, &h, &k, &d.dsize);
- ecode == NTDB_SUCCESS;
- ecode = next_in_hash(ntdb, &h, &k, &d.dsize)) {
- d.dptr = k.dptr + k.dsize;
-
- count++;
- if (fn && fn(ntdb, k, d, p)) {
- ntdb->free_fn(k.dptr, ntdb->alloc_data);
- return count;
- }
- ntdb->free_fn(k.dptr, ntdb->alloc_data);
- }
-
- if (ecode != NTDB_ERR_NOEXIST) {
- return NTDB_ERR_TO_OFF(ecode);
- }
- return count;
-}
-
-_PUBLIC_ enum NTDB_ERROR ntdb_firstkey(struct ntdb_context *ntdb, NTDB_DATA *key)
-{
- struct hash_info h;
-
- return first_in_hash(ntdb, &h, key, NULL);
-}
-
-/* We lock twice, not very efficient. We could keep last key & h cached. */
-_PUBLIC_ enum NTDB_ERROR ntdb_nextkey(struct ntdb_context *ntdb, NTDB_DATA *key)
-{
- struct hash_info h;
- struct ntdb_used_record rec;
- ntdb_off_t off;
-
- off = find_and_lock(ntdb, *key, F_RDLCK, &h, &rec, NULL);
- ntdb->free_fn(key->dptr, ntdb->alloc_data);
- if (NTDB_OFF_IS_ERR(off)) {
- return NTDB_OFF_TO_ERR(off);
- }
- ntdb_unlock_hash(ntdb, h.h, F_RDLCK);
-
- /* If we found something, skip to next. */
- if (off)
- h.bucket++;
- return next_in_hash(ntdb, &h, key, NULL);
-}
-
-static int wipe_one(struct ntdb_context *ntdb,
- NTDB_DATA key, NTDB_DATA data, enum NTDB_ERROR *ecode)
-{
- *ecode = ntdb_delete(ntdb, key);
- return (*ecode != NTDB_SUCCESS);
-}
-
-_PUBLIC_ enum NTDB_ERROR ntdb_wipe_all(struct ntdb_context *ntdb)
-{
- enum NTDB_ERROR ecode;
- int64_t count;
-
- ecode = ntdb_allrecord_lock(ntdb, F_WRLCK, NTDB_LOCK_WAIT, false);
- if (ecode != NTDB_SUCCESS)
- return ecode;
-
- /* FIXME: Be smarter. */
- count = ntdb_traverse(ntdb, wipe_one, &ecode);
- if (count < 0)
- ecode = NTDB_OFF_TO_ERR(count);
- ntdb_allrecord_unlock(ntdb, F_WRLCK);
- return ecode;
-}