2003-01-04 18:53:14 +00:00
|
|
|
/*-
|
|
|
|
* Copyright (c) 1991, 1993, 1994
|
|
|
|
* The Regents of the University of California. All rights reserved.
|
|
|
|
*
|
|
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
|
|
* must display the following acknowledgement:
|
|
|
|
* This product includes software developed by the University of
|
|
|
|
* California, Berkeley and its contributors.
|
|
|
|
* 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[] = "@(#)rec_seq.c 8.3 (Berkeley) 7/14/94";
|
|
|
|
#endif /* not lint */
|
|
|
|
|
|
|
|
#include <sys/types.h>
|
|
|
|
|
|
|
|
#include <errno.h>
|
|
|
|
#include <limits.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <string.h>
|
|
|
|
|
2007-01-14 05:19:09 +00:00
|
|
|
#include "../include/db.h"
|
2003-01-04 18:53:14 +00:00
|
|
|
#include "recno.h"
|
|
|
|
|
|
|
|
/*
|
|
|
|
* __REC_SEQ -- Recno sequential scan interface.
|
|
|
|
*
|
|
|
|
* Parameters:
|
|
|
|
* dbp: pointer to access method
|
|
|
|
* key: key for positioning and return value
|
|
|
|
* data: data return value
|
|
|
|
* flags: R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV.
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
* RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
__rec_seq(dbp, key, data, flags)
|
|
|
|
const DB *dbp;
|
|
|
|
DBT *key, *data;
|
|
|
|
u_int flags;
|
|
|
|
{
|
|
|
|
BTREE *t;
|
|
|
|
EPG *e;
|
|
|
|
recno_t nrec;
|
|
|
|
int 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;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch(flags) {
|
|
|
|
case R_CURSOR:
|
|
|
|
if ((nrec = *(recno_t *)key->data) == 0)
|
|
|
|
goto einval;
|
|
|
|
break;
|
|
|
|
case R_NEXT:
|
|
|
|
if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
|
|
|
|
nrec = t->bt_cursor.rcursor + 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
/* FALLTHROUGH */
|
|
|
|
case R_FIRST:
|
|
|
|
nrec = 1;
|
|
|
|
break;
|
|
|
|
case R_PREV:
|
|
|
|
if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
|
|
|
|
if ((nrec = t->bt_cursor.rcursor - 1) == 0)
|
|
|
|
return (RET_SPECIAL);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
/* FALLTHROUGH */
|
|
|
|
case R_LAST:
|
|
|
|
if (!F_ISSET(t, R_EOF | R_INMEM) &&
|
|
|
|
t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
|
|
|
|
return (RET_ERROR);
|
|
|
|
nrec = t->bt_nrecs;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
einval: errno = EINVAL;
|
|
|
|
return (RET_ERROR);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (t->bt_nrecs == 0 || nrec > t->bt_nrecs) {
|
|
|
|
if (!F_ISSET(t, R_EOF | R_INMEM) &&
|
|
|
|
(status = t->bt_irec(t, nrec)) != RET_SUCCESS)
|
|
|
|
return (status);
|
|
|
|
if (t->bt_nrecs == 0 || nrec > t->bt_nrecs)
|
|
|
|
return (RET_SPECIAL);
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((e = __rec_search(t, nrec - 1, SEARCH)) == NULL)
|
|
|
|
return (RET_ERROR);
|
|
|
|
|
|
|
|
F_SET(&t->bt_cursor, CURS_INIT);
|
|
|
|
t->bt_cursor.rcursor = nrec;
|
|
|
|
|
|
|
|
status = __rec_ret(t, e, nrec, key, data);
|
|
|
|
if (F_ISSET(t, B_DB_LOCK))
|
|
|
|
mpool_put(t->bt_mp, e->page, 0);
|
|
|
|
else
|
|
|
|
t->bt_pinned = e->page;
|
|
|
|
return (status);
|
|
|
|
}
|