[BACK]Return to rec_utils.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / lib / libc / db / recno

File: [cvs.NetBSD.org] / src / lib / libc / db / recno / rec_utils.c (download)

Revision 1.11, Sat Feb 3 23:46:09 2007 UTC (14 years, 11 months ago) by christos
Branch: MAIN
CVS Tags: yamt-pf42-baseX, yamt-pf42-base4, yamt-pf42-base3, yamt-pf42-base2, yamt-pf42-base, yamt-pf42, wrstuden-revivesa-base-2, wrstuden-revivesa-base-1, wrstuden-revivesa-base, matt-mips64-base, matt-mips64, matt-armv6-prevmlocking, matt-armv6-nbase, matt-armv6-base, matt-armv6, keiichi-mipv6-base, keiichi-mipv6, hpcarm-cleanup-nbase, hpcarm-cleanup-base, hpcarm-cleanup, cube-autoconf-base, cube-autoconf
Branch point for: wrstuden-revivesa
Changes since 1.10: +4 -7 lines

cleanup:
	- remove __P
	- remove unneeded casts
	- add _DIAGASSERT
	- add more diagnostics for integer overflow
	- fix size_t/int confusion
	- make debugging and statistics code compile

/*	$NetBSD: rec_utils.c,v 1.11 2007/02/03 23:46:09 christos Exp $	*/

/*-
 * Copyright (c) 1990, 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. 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 HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)rec_utils.c	8.6 (Berkeley) 7/16/94";
#else
__RCSID("$NetBSD: rec_utils.c,v 1.11 2007/02/03 23:46:09 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <db.h>
#include "recno.h"

/*
 * __rec_ret --
 *	Build return data.
 *
 * Parameters:
 *	t:	tree
 *	e:	key/data pair to be returned
 *   nrec:	record number
 *    key:	user's key structure
 *	data:	user's data structure
 *
 * Returns:
 *	RET_SUCCESS, RET_ERROR.
 */
int
__rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data)
{
	RLEAF *rl;
	void *p;

	if (key == NULL)
		goto dataonly;

	/* We have to copy the key, it's not on the page. */
	if (sizeof(recno_t) > t->bt_rkey.size) {
		p = (void *)(t->bt_rkey.data == NULL ?
		    malloc(sizeof(recno_t)) :
		    realloc(t->bt_rkey.data, sizeof(recno_t)));
		if (p == NULL)
			return (RET_ERROR);
		t->bt_rkey.data = p;
		t->bt_rkey.size = sizeof(recno_t);
	}
	memmove(t->bt_rkey.data, &nrec, sizeof(recno_t));
	key->size = sizeof(recno_t);
	key->data = t->bt_rkey.data;

dataonly:
	if (data == NULL)
		return (RET_SUCCESS);

	/*
	 * We must copy big keys/data to make them contigous.  Otherwise,
	 * leave the page pinned and don't copy unless the user specified
	 * concurrent access.
	 */
	rl = GETRLEAF(e->page, e->index);
	if (rl->flags & P_BIGDATA) {
		if (__ovfl_get(t, rl->bytes,
		    &data->size, &t->bt_rdata.data, &t->bt_rdata.size))
			return (RET_ERROR);
		data->data = t->bt_rdata.data;
	} else if (F_ISSET(t, B_DB_LOCK)) {
		/* Use +1 in case the first record retrieved is 0 length. */
		if (rl->dsize + 1 > t->bt_rdata.size) {
			p = (void *)(t->bt_rdata.data == NULL ?
			    malloc(rl->dsize + 1) :
			    realloc(t->bt_rdata.data, rl->dsize + 1));
			if (p == NULL)
				return (RET_ERROR);
			t->bt_rdata.data = p;
			t->bt_rdata.size = rl->dsize + 1;
		}
		memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
		data->size = rl->dsize;
		data->data = t->bt_rdata.data;
	} else {
		data->size = rl->dsize;
		data->data = rl->bytes;
	}
	return (RET_SUCCESS);
}