minix/lib/libc/db/hash/ndbmdatum.c

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/* $NetBSD: ndbmdatum.c,v 1.5 2012/03/13 21:13:33 christos Exp $ */
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/* from: NetBSD: ndbm.c,v 1.18 2004/04/27 20:03:45 kleink Exp */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Margo Seltzer.
*
* 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>
__RCSID("$NetBSD: ndbmdatum.c,v 1.5 2012/03/13 21:13:33 christos Exp $");
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/*
* This package provides a dbm compatible interface to the new hashing
* package described in db(3).
*/
#include "namespace.h"
#include <sys/param.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <ndbm.h>
#include "hash.h"
#ifndef datum_truncate
#define datum_truncate(a) (a)
#endif
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/*
* Returns:
* DATUM on success
* NULL on failure
*/
datum
dbm_fetch(DBM *db, datum key)
{
datum retdata;
int status;
DBT dbtkey, dbtretdata;
dbtkey.data = key.dptr;
dbtkey.size = key.dsize;
status = (db->get)(db, &dbtkey, &dbtretdata, 0);
if (status) {
dbtretdata.data = NULL;
dbtretdata.size = 0;
}
retdata.dptr = dbtretdata.data;
retdata.dsize = datum_truncate(dbtretdata.size);
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return (retdata);
}
/*
* Returns:
* DATUM on success
* NULL on failure
*/
datum
dbm_firstkey(DBM *db)
{
int status;
datum retkey;
DBT dbtretkey, dbtretdata;
status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
if (status)
dbtretkey.data = NULL;
retkey.dptr = dbtretkey.data;
retkey.dsize = datum_truncate(dbtretkey.size);
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return (retkey);
}
/*
* Returns:
* DATUM on success
* NULL on failure
*/
datum
dbm_nextkey(DBM *db)
{
int status;
datum retkey;
DBT dbtretkey, dbtretdata;
status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
if (status)
dbtretkey.data = NULL;
retkey.dptr = dbtretkey.data;
retkey.dsize = datum_truncate(dbtretkey.size);
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return (retkey);
}
/*
* Returns:
* 0 on success
* <0 failure
*/
int
dbm_delete(DBM *db, datum key)
{
int status;
DBT dbtkey;
dbtkey.data = key.dptr;
dbtkey.size = key.dsize;
status = (db->del)(db, &dbtkey, 0);
if (status)
return (-1);
else
return (0);
}
/*
* Returns:
* 0 on success
* <0 failure
* 1 if DBM_INSERT and entry exists
*/
int
dbm_store(DBM *db, datum key, datum data, int flags)
{
DBT dbtkey, dbtdata;
dbtkey.data = key.dptr;
dbtkey.size = key.dsize;
dbtdata.data = data.dptr;
dbtdata.size = data.dsize;
return ((db->put)(db, &dbtkey, &dbtdata,
(u_int)((flags == DBM_INSERT) ? R_NOOVERWRITE : 0)));
}