281 lines
7.3 KiB
C
281 lines
7.3 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)rec_put.c 8.7 (Berkeley) 8/18/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../include/db.h"
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#include "recno.h"
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/*
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* __REC_PUT -- Add a recno item to the tree.
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*
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* Parameters:
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* dbp: pointer to access method
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* key: key
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* data: data
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* flag: R_CURSOR, R_IAFTER, R_IBEFORE, R_NOOVERWRITE
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key is
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* already in the tree and R_NOOVERWRITE specified.
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*/
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int
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__rec_put(dbp, key, data, flags)
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const DB *dbp;
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DBT *key;
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const DBT *data;
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u_int flags;
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{
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BTREE *t;
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DBT fdata, tdata;
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recno_t nrec;
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int status;
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t = dbp->internal;
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/* Toss any page pinned across calls. */
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if (t->bt_pinned != NULL) {
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mpool_put(t->bt_mp, t->bt_pinned, 0);
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t->bt_pinned = NULL;
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}
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/*
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* If using fixed-length records, and the record is long, return
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* EINVAL. If it's short, pad it out. Use the record data return
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* memory, it's only short-term.
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*/
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if (F_ISSET(t, R_FIXLEN) && data->size != t->bt_reclen) {
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if (data->size > t->bt_reclen)
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goto einval;
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if (t->bt_rdata.size < t->bt_reclen) {
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t->bt_rdata.data = t->bt_rdata.data == NULL ?
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malloc(t->bt_reclen) :
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realloc(t->bt_rdata.data, t->bt_reclen);
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if (t->bt_rdata.data == NULL)
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return (RET_ERROR);
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t->bt_rdata.size = t->bt_reclen;
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}
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memmove(t->bt_rdata.data, data->data, data->size);
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memset((char *)t->bt_rdata.data + data->size,
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t->bt_bval, t->bt_reclen - data->size);
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fdata.data = t->bt_rdata.data;
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fdata.size = t->bt_reclen;
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} else {
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fdata.data = data->data;
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fdata.size = data->size;
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}
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switch (flags) {
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case R_CURSOR:
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if (!F_ISSET(&t->bt_cursor, CURS_INIT))
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goto einval;
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nrec = t->bt_cursor.rcursor;
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break;
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case R_SETCURSOR:
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if ((nrec = *(recno_t *)key->data) == 0)
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goto einval;
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break;
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case R_IAFTER:
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if ((nrec = *(recno_t *)key->data) == 0) {
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nrec = 1;
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flags = R_IBEFORE;
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}
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break;
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case 0:
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case R_IBEFORE:
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if ((nrec = *(recno_t *)key->data) == 0)
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goto einval;
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break;
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case R_NOOVERWRITE:
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if ((nrec = *(recno_t *)key->data) == 0)
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goto einval;
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if (nrec <= t->bt_nrecs)
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return (RET_SPECIAL);
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break;
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default:
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einval: errno = EINVAL;
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return (RET_ERROR);
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}
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/*
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* Make sure that records up to and including the put record are
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* already in the database. If skipping records, create empty ones.
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*/
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if (nrec > t->bt_nrecs) {
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if (!F_ISSET(t, R_EOF | R_INMEM) &&
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t->bt_irec(t, nrec) == RET_ERROR)
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return (RET_ERROR);
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if (nrec > t->bt_nrecs + 1) {
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if (F_ISSET(t, R_FIXLEN)) {
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if ((tdata.data =
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(void *)malloc(t->bt_reclen)) == NULL)
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return (RET_ERROR);
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tdata.size = t->bt_reclen;
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memset(tdata.data, t->bt_bval, tdata.size);
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} else {
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tdata.data = NULL;
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tdata.size = 0;
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}
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while (nrec > t->bt_nrecs + 1)
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if (__rec_iput(t,
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t->bt_nrecs, &tdata, 0) != RET_SUCCESS)
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return (RET_ERROR);
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if (F_ISSET(t, R_FIXLEN))
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free(tdata.data);
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}
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}
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if ((status = __rec_iput(t, nrec - 1, &fdata, flags)) != RET_SUCCESS)
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return (status);
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if (flags == R_SETCURSOR)
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t->bt_cursor.rcursor = nrec;
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F_SET(t, R_MODIFIED);
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return (__rec_ret(t, NULL, nrec, key, NULL));
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}
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/*
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* __REC_IPUT -- Add a recno item to the tree.
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*
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* Parameters:
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* t: tree
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* nrec: record number
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* data: data
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS
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*/
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int
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__rec_iput(t, nrec, data, flags)
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BTREE *t;
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recno_t nrec;
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const DBT *data;
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u_int flags;
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{
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DBT tdata;
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EPG *e;
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PAGE *h;
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indx_t idx, nxtindex;
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pgno_t pg;
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u_int32_t nbytes;
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int dflags, status;
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char *dest, db[NOVFLSIZE];
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/*
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* If the data won't fit on a page, store it on indirect pages.
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*
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* XXX
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* If the insert fails later on, these pages aren't recovered.
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*/
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if (data->size > t->bt_ovflsize) {
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if (__ovfl_put(t, data, &pg) == RET_ERROR)
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return (RET_ERROR);
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tdata.data = db;
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tdata.size = NOVFLSIZE;
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*(pgno_t *)db = pg;
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*(u_int32_t *)(db + sizeof(pgno_t)) = data->size;
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dflags = P_BIGDATA;
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data = &tdata;
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} else
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dflags = 0;
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/* __rec_search pins the returned page. */
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if ((e = __rec_search(t, nrec,
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nrec > t->bt_nrecs || flags == R_IAFTER || flags == R_IBEFORE ?
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SINSERT : SEARCH)) == NULL)
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return (RET_ERROR);
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h = e->page;
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idx = e->index;
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/*
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* Add the specified key/data pair to the tree. The R_IAFTER and
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* R_IBEFORE flags insert the key after/before the specified key.
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*
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* Pages are split as required.
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*/
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switch (flags) {
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case R_IAFTER:
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++idx;
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break;
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case R_IBEFORE:
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break;
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default:
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if (nrec < t->bt_nrecs &&
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__rec_dleaf(t, h, idx) == RET_ERROR) {
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mpool_put(t->bt_mp, h, 0);
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return (RET_ERROR);
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}
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break;
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}
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/*
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* If not enough room, split the page. The split code will insert
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* the key and data and unpin the current page. If inserting into
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* the offset array, shift the pointers up.
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*/
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nbytes = NRLEAFDBT(data->size);
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if ((u_int32_t) (h->upper - h->lower) < nbytes + sizeof(indx_t)) {
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status = __bt_split(t, h, NULL, data, dflags, nbytes, idx);
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if (status == RET_SUCCESS)
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++t->bt_nrecs;
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return (status);
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}
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if (idx < (nxtindex = NEXTINDEX(h)))
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memmove(h->linp + idx + 1, h->linp + idx,
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(nxtindex - idx) * sizeof(indx_t));
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h->lower += sizeof(indx_t);
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h->linp[idx] = h->upper -= nbytes;
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dest = (char *)h + h->upper;
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WR_RLEAF(dest, data, dflags);
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++t->bt_nrecs;
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F_SET(t, B_MODIFIED);
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mpool_put(t->bt_mp, h, MPOOL_DIRTY);
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return (RET_SUCCESS);
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}
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