## root/libdb/bt_get.c

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## DEFINITIONS

This source file includes following definitions.

1. __bt_get

    /*-
     * Copyright (c) 1990, 1993, 1994
     *      The Regents of the University of California.  All rights reserved.
     *
     * This code is derived from software contributed to Berkeley by
     * Mike Olson.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */

    #if defined(LIBC_SCCS) && !defined(lint)
    static char sccsid[] = "@(#)bt_get.c    8.6 (Berkeley) 7/20/94";
    #endif /* LIBC_SCCS and not lint */

    #ifdef HAVE_CONFIG_H
    #include <config.h>
    #endif
    #include <sys/types.h>

    #include <errno.h>
    #include <stddef.h>
    #include <stdio.h>

    #include "db.h"
    #include "btree.h"

    /*
     * __BT_GET -- Get a record from the btree.
     *
     * Parameters:
     *      dbp:    pointer to access method
     *      key:    key to find
     *      data:   data to return
     *      flag:   currently unused
     *
     * Returns:
     *      RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
     */
    int
    __bt_get(dbp, key, data, flags)
            const DB *dbp;
            const DBT *key;
            DBT *data;
            u_int flags;
    {
            BTREE *t;
            EPG *e;
            int exact, status;

            t = dbp->internal;

            /* Toss any page pinned across calls. */
            if (t->bt_pinned != NULL) {
                    mpool_put(t->bt_mp, t->bt_pinned, 0);
                    t->bt_pinned = NULL;
            }

            /* Get currently doesn't take any flags. */
            if (flags) {
                    errno = EINVAL;
                    return (RET_ERROR);
            }

            if ((e = __bt_search(t, key, &exact)) == NULL)
                    return (RET_ERROR);
            if (!exact) {
                    mpool_put(t->bt_mp, e->page, 0);
                    return (RET_SPECIAL);
            }

            status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);

            /*
             * If the user is doing concurrent access, we copied the
             * key/data, toss the page.
             */
            if (F_ISSET(t, B_DB_LOCK))
                    mpool_put(t->bt_mp, e->page, 0);
            else
                    t->bt_pinned = e->page;
            return (status);
    }

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