DtMmdb: move to lib directory as a standalone library.
This commit is contained in:
Liang Chang
255
cde/lib/DtMmdb/btree_berkeley/bt_utils.c
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255
cde/lib/DtMmdb/btree_berkeley/bt_utils.c
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/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/* $XConsortium: bt_utils.c /main/3 1996/06/11 17:13:20 cde-hal $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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[] = "@(#)bt_utils.c 8.2 (Berkeley) 9/7/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.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 <db.h>
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#include "btree.h"
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/*
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* __BT_RET -- Build return key/data pair as a result of search or scan.
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*
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* Parameters:
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* t: tree
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* d: LEAF to be returned to the user.
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* key: user's key structure (NULL if not to be filled in)
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* data: user's data structure
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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_ret(BTREE *t, EPG *e, DBT *key, DBT *data)
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{
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BLEAF *bl;
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void *p;
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bl = GETBLEAF(e->page, e->index);
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/*
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* We always copy big keys/data to make them contigous. Otherwise,
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* we leave the page pinned and don't copy unless the user specified
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* concurrent access.
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*/
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if (bl->flags & P_BIGDATA) {
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if (__ovfl_get(t, bl->bytes + bl->ksize,
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&data->size, &t->bt_dbuf, &t->bt_dbufsz))
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return (RET_ERROR);
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data->data = t->bt_dbuf;
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} else if (ISSET(t, B_DB_LOCK)) {
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/* Use +1 in case the first record retrieved is 0 length. */
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if (bl->dsize + 1 > t->bt_dbufsz) {
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if ((p = __fix_realloc(t->bt_dbuf, bl->dsize + 1)) == NULL)
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return (RET_ERROR);
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t->bt_dbuf = p;
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t->bt_dbufsz = bl->dsize + 1;
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}
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memmove(t->bt_dbuf, bl->bytes + bl->ksize, bl->dsize);
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data->size = bl->dsize;
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data->data = t->bt_dbuf;
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} else {
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data->size = bl->dsize;
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data->data = bl->bytes + bl->ksize;
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}
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if (key == NULL)
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return (RET_SUCCESS);
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if (bl->flags & P_BIGKEY) {
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if (__ovfl_get(t, bl->bytes,
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&key->size, &t->bt_kbuf, &t->bt_kbufsz))
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return (RET_ERROR);
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key->data = t->bt_kbuf;
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} else if (ISSET(t, B_DB_LOCK)) {
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if (bl->ksize > t->bt_kbufsz) {
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if ((p = __fix_realloc(t->bt_kbuf, bl->ksize)) == NULL)
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return (RET_ERROR);
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t->bt_kbuf = p;
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t->bt_kbufsz = bl->ksize;
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}
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memmove(t->bt_kbuf, bl->bytes, bl->ksize);
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key->size = bl->ksize;
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key->data = t->bt_kbuf;
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} else {
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key->size = bl->ksize;
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key->data = bl->bytes;
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}
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return (RET_SUCCESS);
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}
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/*
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* __BT_CMP -- Compare a key to a given record.
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*
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* Parameters:
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* t: tree
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* k1: DBT pointer of first arg to comparison
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* e: pointer to EPG for comparison
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*
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* Returns:
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* < 0 if k1 is < record
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* = 0 if k1 is = record
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* > 0 if k1 is > record
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*/
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int
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__bt_cmp(BTREE *t, const DBT *k1, EPG *e)
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{
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BINTERNAL *bi;
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BLEAF *bl;
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DBT k2;
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PAGE *h;
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void *bigkey;
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/*
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* The left-most key on internal pages, at any level of the tree, is
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* guaranteed by the following code to be less than any user key.
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* This saves us from having to update the leftmost key on an internal
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* page when the user inserts a new key in the tree smaller than
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* anything we've yet seen.
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*/
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h = e->page;
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if (e->index == 0 && h->prevpg == P_INVALID && !(h->flags & P_BLEAF))
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return (1);
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bigkey = NULL;
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if (h->flags & P_BLEAF) {
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bl = GETBLEAF(h, e->index);
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if (bl->flags & P_BIGKEY)
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bigkey = bl->bytes;
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else {
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k2.data = bl->bytes;
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k2.size = bl->ksize;
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}
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} else {
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bi = GETBINTERNAL(h, e->index);
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if (bi->flags & P_BIGKEY)
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bigkey = bi->bytes;
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else {
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k2.data = bi->bytes;
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k2.size = bi->ksize;
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}
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}
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if (bigkey) {
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if (__ovfl_get(t, bigkey,
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&k2.size, &t->bt_dbuf, &t->bt_dbufsz))
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return (RET_ERROR);
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k2.data = t->bt_dbuf;
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}
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return ((*t->bt_cmp)(k1, &k2));
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}
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/*
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* __BT_DEFCMP -- Default comparison routine.
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*
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* Parameters:
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* a: DBT #1
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* b: DBT #2
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*
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* Returns:
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* < 0 if a is < b
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* = 0 if a is = b
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* > 0 if a is > b
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*/
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int
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__bt_defcmp(const DBT *a, const DBT *b)
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{
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u_char *p1, *p2;
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int diff, len;
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len = MIN(a->size, b->size);
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for (p1 = a->data, p2 = b->data; len--; ++p1, ++p2)
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if ((diff = *p1 - *p2))
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return (diff);
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return (a->size - b->size);
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}
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/*
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* __BT_DEFPFX -- Default prefix routine.
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*
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* Parameters:
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* a: DBT #1
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* b: DBT #2
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*
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* Returns:
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* Number of bytes needed to distinguish b from a.
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*/
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int
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__bt_defpfx(const DBT *a, const DBT *b)
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{
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u_char *p1, *p2;
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int len;
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int cnt;
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cnt = 1;
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len = MIN(a->size, b->size);
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for (p1 = a->data, p2 = b->data; len--; ++p1, ++p2, ++cnt)
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if (*p1 != *p2)
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return (cnt);
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/* a->size must be <= b->size, or they wouldn't be in this order. */
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return (a->size < b->size ? a->size + 1 : a->size);
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}
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