130 lines
4.0 KiB
C
130 lines
4.0 KiB
C
/* $NetBSD: rec_utils.c,v 1.8 1997/07/13 18:52:15 christos Exp $ */
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/*-
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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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)rec_utils.c 8.6 (Berkeley) 7/16/94";
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#else
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__RCSID("$NetBSD: rec_utils.c,v 1.8 1997/07/13 18:52:15 christos Exp $");
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#endif
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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 "recno.h"
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/*
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* __rec_ret --
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* Build return data.
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*
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* Parameters:
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* t: tree
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* e: key/data pair to be returned
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* nrec: record number
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* key: user's key structure
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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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__rec_ret(t, e, nrec, key, data)
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BTREE *t;
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EPG *e;
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recno_t nrec;
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DBT *key, *data;
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{
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RLEAF *rl;
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void *p;
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if (key == NULL)
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goto dataonly;
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/* We have to copy the key, it's not on the page. */
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if (sizeof(recno_t) > t->bt_rkey.size) {
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p = (void *)(t->bt_rkey.data == NULL ?
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malloc(sizeof(recno_t)) :
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realloc(t->bt_rkey.data, sizeof(recno_t)));
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if (p == NULL)
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return (RET_ERROR);
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t->bt_rkey.data = p;
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t->bt_rkey.size = sizeof(recno_t);
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}
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memmove(t->bt_rkey.data, &nrec, sizeof(recno_t));
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key->size = sizeof(recno_t);
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key->data = t->bt_rkey.data;
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dataonly:
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if (data == NULL)
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return (RET_SUCCESS);
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/*
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* We must copy big keys/data to make them contigous. Otherwise,
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* 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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rl = GETRLEAF(e->page, e->index);
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if (rl->flags & P_BIGDATA) {
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if (__ovfl_get(t, rl->bytes,
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&data->size, &t->bt_rdata.data, &t->bt_rdata.size))
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return (RET_ERROR);
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data->data = t->bt_rdata.data;
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} else if (F_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 (rl->dsize + 1 > t->bt_rdata.size) {
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p = (void *)(t->bt_rdata.data == NULL ?
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malloc(rl->dsize + 1) :
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realloc(t->bt_rdata.data, rl->dsize + 1));
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if (p == NULL)
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return (RET_ERROR);
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t->bt_rdata.data = p;
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t->bt_rdata.size = rl->dsize + 1;
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}
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memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
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data->size = rl->dsize;
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data->data = t->bt_rdata.data;
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} else {
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data->size = rl->dsize;
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data->data = rl->bytes;
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}
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return (RET_SUCCESS);
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}
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