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2237daed7e
This clarifies the code a little, but also provides a more explicit mechanism which can be used to debug error handling (by introducing tdb_err_t and making it a pointer type). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (Imported from CCAN commit afa6d57b7d93fe4675a952f556eb462951baa257)
135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/*
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Trivial Database 2: traverse function.
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Copyright (C) Rusty Russell 2010
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "private.h"
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#include <ccan/likely/likely.h>
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int64_t tdb_traverse_(struct tdb_context *tdb,
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int (*fn)(struct tdb_context *,
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TDB_DATA, TDB_DATA, void *),
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void *p)
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{
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enum TDB_ERROR ecode;
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struct traverse_info tinfo;
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struct tdb_data k, d;
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int64_t count = 0;
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if (tdb->flags & TDB_VERSION1) {
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count = tdb1_traverse(tdb, fn, p);
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if (count == -1)
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return TDB_ERR_TO_OFF(tdb->last_error);
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return count;
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}
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k.dptr = NULL;
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for (ecode = first_in_hash(tdb, &tinfo, &k, &d.dsize);
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ecode == TDB_SUCCESS;
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ecode = next_in_hash(tdb, &tinfo, &k, &d.dsize)) {
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d.dptr = k.dptr + k.dsize;
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count++;
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if (fn && fn(tdb, k, d, p)) {
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free(k.dptr);
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tdb->last_error = TDB_SUCCESS;
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return count;
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}
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free(k.dptr);
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}
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if (ecode != TDB_ERR_NOEXIST) {
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return TDB_ERR_TO_OFF(tdb->last_error = ecode);
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}
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tdb->last_error = TDB_SUCCESS;
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return count;
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}
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enum TDB_ERROR tdb_firstkey(struct tdb_context *tdb, struct tdb_data *key)
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{
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struct traverse_info tinfo;
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if (tdb->flags & TDB_VERSION1) {
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tdb->last_error = TDB_SUCCESS;
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*key = tdb1_firstkey(tdb);
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/* TDB1 didn't set error for last key. */
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if (!key->dptr && tdb->last_error == TDB_SUCCESS) {
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tdb->last_error = TDB_ERR_NOEXIST;
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}
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return tdb->last_error;
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}
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return tdb->last_error = first_in_hash(tdb, &tinfo, key, NULL);
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}
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/* We lock twice, not very efficient. We could keep last key & tinfo cached. */
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enum TDB_ERROR tdb_nextkey(struct tdb_context *tdb, struct tdb_data *key)
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{
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struct traverse_info tinfo;
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struct hash_info h;
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struct tdb_used_record rec;
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if (tdb->flags & TDB_VERSION1) {
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struct tdb_data last_key = *key;
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tdb->last_error = TDB_SUCCESS;
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*key = tdb1_nextkey(tdb, last_key);
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free(last_key.dptr);
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/* TDB1 didn't set error for last key. */
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if (!key->dptr && tdb->last_error == TDB_SUCCESS) {
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tdb->last_error = TDB_ERR_NOEXIST;
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}
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return tdb->last_error;
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}
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tinfo.prev = find_and_lock(tdb, *key, F_RDLCK, &h, &rec, &tinfo);
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free(key->dptr);
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if (TDB_OFF_IS_ERR(tinfo.prev)) {
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return tdb->last_error = TDB_OFF_TO_ERR(tinfo.prev);
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}
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tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
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return tdb->last_error = next_in_hash(tdb, &tinfo, key, NULL);
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}
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static int wipe_one(struct tdb_context *tdb,
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TDB_DATA key, TDB_DATA data, enum TDB_ERROR *ecode)
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{
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*ecode = tdb_delete(tdb, key);
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return (*ecode != TDB_SUCCESS);
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}
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enum TDB_ERROR tdb_wipe_all(struct tdb_context *tdb)
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{
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enum TDB_ERROR ecode;
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int64_t count;
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if (tdb->flags & TDB_VERSION1) {
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if (tdb1_wipe_all(tdb) == -1)
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return tdb->last_error;
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return TDB_SUCCESS;
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}
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ecode = tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_WAIT, false);
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if (ecode != TDB_SUCCESS)
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return tdb->last_error = ecode;
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/* FIXME: Be smarter. */
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count = tdb_traverse(tdb, wipe_one, &ecode);
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if (count < 0)
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ecode = TDB_OFF_TO_ERR(count);
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tdb_allrecord_unlock(tdb, F_WRLCK);
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return tdb->last_error = ecode;
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}
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