1*d3595ddfSjoerg /* $NetBSD: bt_get.c,v 1.13 2008/09/11 12:58:00 joerg Exp $ */
2a954b078Scgd
39f0aa214Scgd /*-
424420c01Scgd * Copyright (c) 1990, 1993, 1994
59f0aa214Scgd * The Regents of the University of California. All rights reserved.
69f0aa214Scgd *
79f0aa214Scgd * This code is derived from software contributed to Berkeley by
89f0aa214Scgd * Mike Olson.
99f0aa214Scgd *
109f0aa214Scgd * Redistribution and use in source and binary forms, with or without
119f0aa214Scgd * modification, are permitted provided that the following conditions
129f0aa214Scgd * are met:
139f0aa214Scgd * 1. Redistributions of source code must retain the above copyright
149f0aa214Scgd * notice, this list of conditions and the following disclaimer.
159f0aa214Scgd * 2. Redistributions in binary form must reproduce the above copyright
169f0aa214Scgd * notice, this list of conditions and the following disclaimer in the
179f0aa214Scgd * documentation and/or other materials provided with the distribution.
18eb7c1594Sagc * 3. Neither the name of the University nor the names of its contributors
199f0aa214Scgd * may be used to endorse or promote products derived from this software
209f0aa214Scgd * without specific prior written permission.
219f0aa214Scgd *
229f0aa214Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
239f0aa214Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
249f0aa214Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
259f0aa214Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
269f0aa214Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
279f0aa214Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
289f0aa214Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
299f0aa214Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
309f0aa214Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
319f0aa214Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
329f0aa214Scgd * SUCH DAMAGE.
339f0aa214Scgd */
349f0aa214Scgd
35*d3595ddfSjoerg #if HAVE_NBTOOL_CONFIG_H
36*d3595ddfSjoerg #include "nbtool_config.h"
37*d3595ddfSjoerg #endif
38*d3595ddfSjoerg
3900ae392dSchristos #include <sys/cdefs.h>
40*d3595ddfSjoerg __RCSID("$NetBSD: bt_get.c,v 1.13 2008/09/11 12:58:00 joerg Exp $");
419f0aa214Scgd
4243fa6fe3Sjtc #include "namespace.h"
439f0aa214Scgd #include <sys/types.h>
449f0aa214Scgd
45cb9daf8fSchristos #include <assert.h>
469f0aa214Scgd #include <errno.h>
479f0aa214Scgd #include <stddef.h>
489f0aa214Scgd #include <stdio.h>
499f0aa214Scgd
509f0aa214Scgd #include <db.h>
519f0aa214Scgd #include "btree.h"
529f0aa214Scgd
539f0aa214Scgd /*
549f0aa214Scgd * __BT_GET -- Get a record from the btree.
559f0aa214Scgd *
569f0aa214Scgd * Parameters:
579f0aa214Scgd * dbp: pointer to access method
589f0aa214Scgd * key: key to find
599f0aa214Scgd * data: data to return
609f0aa214Scgd * flag: currently unused
619f0aa214Scgd *
629f0aa214Scgd * Returns:
639f0aa214Scgd * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
649f0aa214Scgd */
659f0aa214Scgd int
__bt_get(const DB * dbp,const DBT * key,DBT * data,u_int flags)66cb9daf8fSchristos __bt_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
679f0aa214Scgd {
689f0aa214Scgd BTREE *t;
699f0aa214Scgd EPG *e;
709f0aa214Scgd int exact, status;
719f0aa214Scgd
7245e27c80Scgd t = dbp->internal;
7345e27c80Scgd
7445e27c80Scgd /* Toss any page pinned across calls. */
7545e27c80Scgd if (t->bt_pinned != NULL) {
7645e27c80Scgd mpool_put(t->bt_mp, t->bt_pinned, 0);
7745e27c80Scgd t->bt_pinned = NULL;
7845e27c80Scgd }
7945e27c80Scgd
8045e27c80Scgd /* Get currently doesn't take any flags. */
819f0aa214Scgd if (flags) {
829f0aa214Scgd errno = EINVAL;
839f0aa214Scgd return (RET_ERROR);
849f0aa214Scgd }
8545e27c80Scgd
869f0aa214Scgd if ((e = __bt_search(t, key, &exact)) == NULL)
879f0aa214Scgd return (RET_ERROR);
889f0aa214Scgd if (!exact) {
899f0aa214Scgd mpool_put(t->bt_mp, e->page, 0);
909f0aa214Scgd return (RET_SPECIAL);
919f0aa214Scgd }
929f0aa214Scgd
9324420c01Scgd status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);
949f0aa214Scgd
9545e27c80Scgd /*
9645e27c80Scgd * If the user is doing concurrent access, we copied the
9745e27c80Scgd * key/data, toss the page.
9845e27c80Scgd */
9924420c01Scgd if (F_ISSET(t, B_DB_LOCK))
1009f0aa214Scgd mpool_put(t->bt_mp, e->page, 0);
10145e27c80Scgd else
10245e27c80Scgd t->bt_pinned = e->page;
1039f0aa214Scgd return (status);
1049f0aa214Scgd }
105