1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Mike Olson. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/types.h> 36 37 #include <errno.h> 38 #include <stddef.h> 39 #include <stdio.h> 40 41 #include <db.h> 42 #include "btree.h" 43 44 /* 45 * __BT_GET -- Get a record from the btree. 46 * 47 * Parameters: 48 * dbp: pointer to access method 49 * key: key to find 50 * data: data to return 51 * flag: currently unused 52 * 53 * Returns: 54 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found. 55 */ 56 int 57 __bt_get(const DB *dbp, const DBT *key, DBT *data, u_int flags) 58 { 59 BTREE *t; 60 EPG *e; 61 int exact, status; 62 63 t = dbp->internal; 64 65 /* Toss any page pinned across calls. */ 66 if (t->bt_pinned != NULL) { 67 mpool_put(t->bt_mp, t->bt_pinned, 0); 68 t->bt_pinned = NULL; 69 } 70 71 /* Get currently doesn't take any flags. */ 72 if (flags) { 73 errno = EINVAL; 74 return (RET_ERROR); 75 } 76 77 if ((e = __bt_search(t, key, &exact)) == NULL) 78 return (RET_ERROR); 79 if (!exact) { 80 mpool_put(t->bt_mp, e->page, 0); 81 return (RET_SPECIAL); 82 } 83 84 status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0); 85 86 /* 87 * If the user is doing concurrent access, we copied the 88 * key/data, toss the page. 89 */ 90 if (F_ISSET(t, B_DB_LOCK)) 91 mpool_put(t->bt_mp, e->page, 0); 92 else 93 t->bt_pinned = e->page; 94 return (status); 95 } 96