ccan/ntdb: demote to junkcode.

[ccan] / junkcode / rusty@rustcorp.com.au-ntdb / traverse.c

diff --git a/junkcode/rusty@rustcorp.com.au-ntdb/traverse.c b/junkcode/rusty@rustcorp.com.au-ntdb/traverse.c
new file mode 100644 (file)
index 0000000..2e6763c
--- /dev/null
+++ b/junkcode/rusty@rustcorp.com.au-ntdb/traverse.c
@@ -0,0 +1,100 @@
+ /*
+   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;
+}