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/*
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>
int64_t tdb_traverse_(struct tdb_context *tdb,
int (*fn)(struct tdb_context *,
TDB_DATA, TDB_DATA, void *),
void *p)
{
enum TDB_ERROR ecode;
struct traverse_info tinfo;
struct tdb_data k, d;
int64_t count = 0;
k.dptr = NULL;
for (ecode = first_in_hash(tdb, &tinfo, &k, &d.dsize);
ecode == TDB_SUCCESS;
ecode = next_in_hash(tdb, &tinfo, &k, &d.dsize)) {
d.dptr = k.dptr + k.dsize;
count++;
if (fn && fn(tdb, k, d, p)) {
free(k.dptr);
tdb->last_error = TDB_SUCCESS;
return count;
}
free(k.dptr);
}
if (ecode != TDB_ERR_NOEXIST) {
return tdb->last_error = ecode;
}
tdb->last_error = TDB_SUCCESS;
return count;
}
enum TDB_ERROR tdb_firstkey(struct tdb_context *tdb, struct tdb_data *key)
{
struct traverse_info tinfo;
return tdb->last_error = first_in_hash(tdb, &tinfo, key, NULL);
}
/* We lock twice, not very efficient. We could keep last key & tinfo cached. */
enum TDB_ERROR tdb_nextkey(struct tdb_context *tdb, struct tdb_data *key)
{
struct traverse_info tinfo;
struct hash_info h;
struct tdb_used_record rec;
tinfo.prev = find_and_lock(tdb, *key, F_RDLCK, &h, &rec, &tinfo);
free(key->dptr);
if (TDB_OFF_IS_ERR(tinfo.prev)) {
return tdb->last_error = tinfo.prev;
}
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
return tdb->last_error = next_in_hash(tdb, &tinfo, key, NULL);
}
static int wipe_one(struct tdb_context *tdb,
TDB_DATA key, TDB_DATA data, enum TDB_ERROR *ecode)
{
*ecode = tdb_delete(tdb, key);
return (*ecode != TDB_SUCCESS);
}
enum TDB_ERROR tdb_wipe_all(struct tdb_context *tdb)
{
enum TDB_ERROR ecode;
int64_t count;
ecode = tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_WAIT, false);
if (ecode != TDB_SUCCESS)
return tdb->last_error = ecode;
/* FIXME: Be smarter. */
count = tdb_traverse(tdb, wipe_one, &ecode);
if (count < 0)
ecode = count;
tdb_allrecord_unlock(tdb, F_WRLCK);
return tdb->last_error = ecode;
}
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