2 Trivial Database 2: traverse function.
3 Copyright (C) Rusty Russell 2010
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 3 of the License, or (at your option) any later version.
10 This library is distributed in the hope that it will be useful,
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
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19 #include <ccan/likely/likely.h>
21 int64_t tdb_traverse_(struct tdb_context *tdb,
22 int (*fn)(struct tdb_context *,
23 TDB_DATA, TDB_DATA, void *),
27 struct traverse_info tinfo;
32 for (ecode = first_in_hash(tdb, &tinfo, &k, &d.dsize);
34 ecode = next_in_hash(tdb, &tinfo, &k, &d.dsize)) {
35 d.dptr = k.dptr + k.dsize;
38 if (fn && fn(tdb, k, d, p)) {
45 if (ecode != TDB_ERR_NOEXIST) {
51 enum TDB_ERROR tdb_firstkey(struct tdb_context *tdb, struct tdb_data *key)
53 struct traverse_info tinfo;
55 return first_in_hash(tdb, &tinfo, key, NULL);
58 /* We lock twice, not very efficient. We could keep last key & tinfo cached. */
59 enum TDB_ERROR tdb_nextkey(struct tdb_context *tdb, struct tdb_data *key)
61 struct traverse_info tinfo;
63 struct tdb_used_record rec;
65 tinfo.prev = find_and_lock(tdb, *key, F_RDLCK, &h, &rec, &tinfo);
67 if (TDB_OFF_IS_ERR(tinfo.prev)) {
70 tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
72 return next_in_hash(tdb, &tinfo, key, NULL);