source: rtems-libbsd/freebsd/lib/libc/db/btree/bt_get.c @ 2404264

/*-
 * 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.
 * 4. 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 */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <rtems/bsd/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(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);
}