313 lines
8.2 KiB
C
313 lines
8.2 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Olson.
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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[] = "@(#)insert.c 5.3 (Berkeley) 2/22/91";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <db.h>
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#include <stdlib.h>
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#include <string.h>
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#include "btree.h"
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/*
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* _BT_INSERT -- Insert a new user datum in the btree.
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*
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* This routine is called by bt_put, the public interface, once the
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* location for the new item is known. We do the work here, and
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* handle splits if necessary.
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*
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* Parameters:
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* t -- btree in which to do the insertion.
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* item -- BTITEM describing location of new datum
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* key -- key to insert
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* data -- data associated with key
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* flag -- magic cookie passed recursively to bt_put if we
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* have to do a split
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*
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* Returns:
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* RET_SUCCESS, RET_ERROR.
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*/
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int
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_bt_insert(t, item, key, data, flag)
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BTREE_P t;
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BTITEM *item;
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DBT *key;
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DBT *data;
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int flag;
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{
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index_t index;
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BTHEADER *h;
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DATUM *d;
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int nbytes;
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int status;
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pgno_t pgno;
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int keysize, datasize;
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int bigkey, bigdata;
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if (_bt_getpage(t, item->bti_pgno) == RET_ERROR)
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return (RET_ERROR);
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h = t->bt_curpage;
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if (TOOBIG(t, data->size)) {
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bigdata = TRUE;
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datasize = sizeof(pgno_t);
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} else {
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bigdata = FALSE;
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datasize = data->size;
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}
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if (TOOBIG(t, key->size)) {
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bigkey = TRUE;
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keysize = sizeof(pgno_t);
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} else {
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bigkey = FALSE;
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keysize = key->size;
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}
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nbytes = keysize + datasize + (sizeof(DATUM) - sizeof(char));
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nbytes = LONGALIGN(nbytes) + sizeof(index_t);
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/* if there's not enough room here, split the page */
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if ((h->h_upper - h->h_lower) < nbytes) {
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if (_bt_split(t) == RET_ERROR)
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return (RET_ERROR);
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/* okay, try again (empty the stack first, though) */
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while (_bt_pop((BTREE) t) != P_NONE)
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continue;
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return (bt_put((BTREE) t, key, data, flag));
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}
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/* put together a leaf page datum from the key/data pair */
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index = item->bti_index;
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nbytes = keysize + datasize + (sizeof(DATUM) - sizeof(char));
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if ((d = (DATUM *) malloc((unsigned) nbytes)) == (DATUM *) NULL)
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return (RET_ERROR);
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d->d_ksize = keysize;
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d->d_dsize = datasize;
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d->d_flags = 0;
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if (bigkey) {
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if (_bt_indirect(t, key, &pgno) == RET_ERROR)
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return (RET_ERROR);
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(void) bcopy((char *) &pgno, &(d->d_bytes[0]), sizeof(pgno));
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d->d_flags |= D_BIGKEY;
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if (_bt_getpage(t, item->bti_pgno) == RET_ERROR)
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return (RET_ERROR);
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} else {
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if (d->d_ksize > 0) {
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(void) bcopy((char *) key->data,
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(char *) &(d->d_bytes[0]),
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(int) d->d_ksize);
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}
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}
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if (bigdata) {
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if (_bt_indirect(t, data, &pgno) == RET_ERROR)
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return (RET_ERROR);
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(void) bcopy((char *) &pgno,
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&(d->d_bytes[keysize]),
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sizeof(pgno));
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d->d_flags |= D_BIGDATA;
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if (_bt_getpage(t, item->bti_pgno) == RET_ERROR)
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return (RET_ERROR);
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} else {
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if (d->d_dsize > 0) {
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(void) bcopy((char *) data->data,
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(char *) &(d->d_bytes[keysize]),
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(int) d->d_dsize);
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}
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}
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/* do the insertion */
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status = _bt_insertat(t, (char *) d, index);
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(void) free((char *) d);
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return (status);
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}
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/*
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* _BT_INSERTI -- Insert IDATUM on current page in the btree.
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*
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* This routine handles insertions to internal pages after splits
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* lower in the tree. On entry, t->bt_curpage is the page to get
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* the new IDATUM. We are also given pgno, the page number of the
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* IDATUM that is immediately left of the new IDATUM's position.
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* This guarantees that the IDATUM for the right half of the page
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* after a split goes next to the IDATUM for its left half.
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*
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* Parameters:
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* t -- tree in which to do insertion.
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* id -- new IDATUM to insert
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* pgno -- page number of IDATUM left of id's position
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*
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* Returns:
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* RET_SUCCESS, RET_ERROR.
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*/
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int
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_bt_inserti(t, id, pgno)
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BTREE_P t;
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IDATUM *id;
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pgno_t pgno;
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{
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BTHEADER *h = t->bt_curpage;
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index_t next, i;
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IDATUM *idx;
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char *key;
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pgno_t chain;
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int free_key;
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int ignore;
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if (id->i_flags & D_BIGKEY) {
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free_key = TRUE;
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bcopy(&(id->i_bytes[0]), (char *) &chain, sizeof(chain));
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if (_bt_getbig(t, chain, &key, &ignore) == RET_ERROR)
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return (RET_ERROR);
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} else {
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free_key = FALSE;
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key = &(id->i_bytes[0]);
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}
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i = _bt_binsrch(t, key);
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next = NEXTINDEX(h);
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while (i < next && _bt_cmp(t, key, i) >= 0)
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i++;
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if (free_key)
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(void) free(key);
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/* okay, now we're close; find adjacent IDATUM */
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for (;;) {
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idx = (IDATUM *) GETDATUM(h,i);
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if (idx->i_pgno == pgno) {
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i++;
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break;
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}
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--i;
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}
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/* correctly positioned, do the insertion */
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return (_bt_insertat(t, (char *) id, i));
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}
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/*
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* _BT_INSERTAT -- Insert a datum at a given location on the current page.
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*
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* This routine does insertions on both leaf and internal pages.
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*
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* Parameters:
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* t -- tree in which to do insertion.
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* p -- DATUM or IDATUM to insert.
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* index -- index in line pointer array to put this item.
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*
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* Returns:
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* RET_SUCCESS, RET_ERROR.
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*
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* Side Effects:
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* Will rearrange line pointers to make space for the new
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* entry. This means that any scans currently active are
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* invalid after this.
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*
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* Warnings:
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* There must be sufficient room for the new item on the page.
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*/
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int
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_bt_insertat(t, p, index)
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BTREE_P t;
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char *p;
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index_t index;
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{
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IDATUM *id = (IDATUM *) p;
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DATUM *d = (DATUM *) p;
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BTHEADER *h;
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CURSOR *c;
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index_t nxtindex;
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char *src, *dest;
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int nbytes;
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/* insertion may confuse an active scan. fix it. */
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c = &(t->bt_cursor);
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if (t->bt_flags & BTF_SEQINIT && t->bt_curpage->h_pgno == c->c_pgno)
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if (_bt_fixscan(t, index, d, INSERT) == RET_ERROR)
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return (RET_ERROR);
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h = t->bt_curpage;
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nxtindex = (index_t) NEXTINDEX(h);
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/*
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* If we're inserting at the middle of the line pointer array,
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* copy pointers that will follow the new one up on the page.
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*/
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if (index < nxtindex) {
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src = (char *) &(h->h_linp[index]);
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dest = (char *) &(h->h_linp[index + 1]);
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nbytes = (h->h_lower - (src - ((char *) h)))
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+ sizeof(h->h_linp[0]);
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(void) bcopy(src, dest, nbytes);
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}
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/* compute size and copy data to page */
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if (h->h_flags & F_LEAF) {
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nbytes = d->d_ksize + d->d_dsize
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+ (sizeof(DATUM) - sizeof(char));
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} else {
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nbytes = id->i_size + (sizeof(IDATUM) - sizeof(char));
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}
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dest = (((char *) h) + h->h_upper) - LONGALIGN(nbytes);
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(void) bcopy((char *) p, dest, nbytes);
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/* update statistics */
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dest -= (int) h;
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h->h_linp[index] = (index_t) dest;
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h->h_upper = (index_t) dest;
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h->h_lower += sizeof(index_t);
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/* we're done */
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h->h_flags |= F_DIRTY;
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return (RET_SUCCESS);
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}
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