17c478bd9Sstevel@tonic-gate /*-
27c478bd9Sstevel@tonic-gate * Copyright (c) 1990, 1993, 1994
37c478bd9Sstevel@tonic-gate * The Regents of the University of California. All rights reserved.
47c478bd9Sstevel@tonic-gate *
57c478bd9Sstevel@tonic-gate * This code is derived from software contributed to Berkeley by
67c478bd9Sstevel@tonic-gate * Mike Olson.
77c478bd9Sstevel@tonic-gate *
87c478bd9Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without
97c478bd9Sstevel@tonic-gate * modification, are permitted provided that the following conditions
107c478bd9Sstevel@tonic-gate * are met:
117c478bd9Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright
127c478bd9Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer.
137c478bd9Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright
147c478bd9Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the
157c478bd9Sstevel@tonic-gate * documentation and/or other materials provided with the distribution.
167c478bd9Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software
177c478bd9Sstevel@tonic-gate * must display the following acknowledgement:
187c478bd9Sstevel@tonic-gate * This product includes software developed by the University of
197c478bd9Sstevel@tonic-gate * California, Berkeley and its contributors.
207c478bd9Sstevel@tonic-gate * 4. Neither the name of the University nor the names of its contributors
217c478bd9Sstevel@tonic-gate * may be used to endorse or promote products derived from this software
227c478bd9Sstevel@tonic-gate * without specific prior written permission.
237c478bd9Sstevel@tonic-gate *
247c478bd9Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
257c478bd9Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
267c478bd9Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
277c478bd9Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
287c478bd9Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
297c478bd9Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
307c478bd9Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
317c478bd9Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
327c478bd9Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
337c478bd9Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
347c478bd9Sstevel@tonic-gate * SUCH DAMAGE.
357c478bd9Sstevel@tonic-gate */
367c478bd9Sstevel@tonic-gate
377c478bd9Sstevel@tonic-gate #if defined(LIBC_SCCS) && !defined(lint)
387c478bd9Sstevel@tonic-gate static char sccsid[] = "@(#)bt_get.c 8.6 (Berkeley) 7/20/94";
397c478bd9Sstevel@tonic-gate #endif /* LIBC_SCCS and not lint */
407c478bd9Sstevel@tonic-gate
417c478bd9Sstevel@tonic-gate #include <sys/types.h>
427c478bd9Sstevel@tonic-gate
437c478bd9Sstevel@tonic-gate #include <errno.h>
447c478bd9Sstevel@tonic-gate #include <stddef.h>
457c478bd9Sstevel@tonic-gate #include <stdio.h>
467c478bd9Sstevel@tonic-gate
477c478bd9Sstevel@tonic-gate #include "db-int.h"
487c478bd9Sstevel@tonic-gate #include "btree.h"
497c478bd9Sstevel@tonic-gate
507c478bd9Sstevel@tonic-gate /*
517c478bd9Sstevel@tonic-gate * __BT_GET -- Get a record from the btree.
527c478bd9Sstevel@tonic-gate *
537c478bd9Sstevel@tonic-gate * Parameters:
547c478bd9Sstevel@tonic-gate * dbp: pointer to access method
557c478bd9Sstevel@tonic-gate * key: key to find
567c478bd9Sstevel@tonic-gate * data: data to return
577c478bd9Sstevel@tonic-gate * flag: currently unused
587c478bd9Sstevel@tonic-gate *
597c478bd9Sstevel@tonic-gate * Returns:
607c478bd9Sstevel@tonic-gate * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
617c478bd9Sstevel@tonic-gate */
627c478bd9Sstevel@tonic-gate int
__bt_get(dbp,key,data,flags)637c478bd9Sstevel@tonic-gate __bt_get(dbp, key, data, flags)
647c478bd9Sstevel@tonic-gate const DB *dbp;
657c478bd9Sstevel@tonic-gate const DBT *key;
667c478bd9Sstevel@tonic-gate DBT *data;
677c478bd9Sstevel@tonic-gate u_int flags;
687c478bd9Sstevel@tonic-gate {
697c478bd9Sstevel@tonic-gate BTREE *t;
707c478bd9Sstevel@tonic-gate EPG *e;
717c478bd9Sstevel@tonic-gate int exact, status;
727c478bd9Sstevel@tonic-gate
737c478bd9Sstevel@tonic-gate t = dbp->internal;
747c478bd9Sstevel@tonic-gate
757c478bd9Sstevel@tonic-gate /* Toss any page pinned across calls. */
767c478bd9Sstevel@tonic-gate if (t->bt_pinned != NULL) {
777c478bd9Sstevel@tonic-gate mpool_put(t->bt_mp, t->bt_pinned, 0);
787c478bd9Sstevel@tonic-gate t->bt_pinned = NULL;
797c478bd9Sstevel@tonic-gate }
807c478bd9Sstevel@tonic-gate
817c478bd9Sstevel@tonic-gate /* Get currently doesn't take any flags. */
827c478bd9Sstevel@tonic-gate if (flags) {
837c478bd9Sstevel@tonic-gate errno = EINVAL;
847c478bd9Sstevel@tonic-gate return (RET_ERROR);
857c478bd9Sstevel@tonic-gate }
867c478bd9Sstevel@tonic-gate
877c478bd9Sstevel@tonic-gate if ((e = __bt_search(t, key, &exact)) == NULL)
887c478bd9Sstevel@tonic-gate return (RET_ERROR);
897c478bd9Sstevel@tonic-gate if (!exact) {
907c478bd9Sstevel@tonic-gate mpool_put(t->bt_mp, e->page, 0);
917c478bd9Sstevel@tonic-gate return (RET_SPECIAL);
927c478bd9Sstevel@tonic-gate }
937c478bd9Sstevel@tonic-gate
947c478bd9Sstevel@tonic-gate status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);
957c478bd9Sstevel@tonic-gate
967c478bd9Sstevel@tonic-gate /*
977c478bd9Sstevel@tonic-gate * If the user is doing concurrent access, we copied the
987c478bd9Sstevel@tonic-gate * key/data, toss the page.
997c478bd9Sstevel@tonic-gate */
1007c478bd9Sstevel@tonic-gate if (F_ISSET(t, B_DB_LOCK))
1017c478bd9Sstevel@tonic-gate mpool_put(t->bt_mp, e->page, 0);
1027c478bd9Sstevel@tonic-gate else
1037c478bd9Sstevel@tonic-gate t->bt_pinned = e->page;
1047c478bd9Sstevel@tonic-gate return (status);
1057c478bd9Sstevel@tonic-gate }
106