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      1 /*	$NetBSD: ndbmdatum.c,v 1.5 2012/03/13 21:13:33 christos Exp $	*/
      2 /*	from: NetBSD: ndbm.c,v 1.18 2004/04/27 20:03:45 kleink Exp 	*/
      3 
      4 /*-
      5  * Copyright (c) 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * Margo Seltzer.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if HAVE_NBTOOL_CONFIG_H
     37 #include "nbtool_config.h"
     38 #endif
     39 
     40 #include <sys/cdefs.h>
     41 __RCSID("$NetBSD: ndbmdatum.c,v 1.5 2012/03/13 21:13:33 christos Exp $");
     42 
     43 /*
     44  * This package provides a dbm compatible interface to the new hashing
     45  * package described in db(3).
     46  */
     47 #include "namespace.h"
     48 #include <sys/param.h>
     49 
     50 #include <fcntl.h>
     51 #include <stdio.h>
     52 #include <string.h>
     53 
     54 #include <ndbm.h>
     55 #include "hash.h"
     56 
     57 #ifndef datum_truncate
     58 #define datum_truncate(a) (a)
     59 #endif
     60 /*
     61  * Returns:
     62  *	DATUM on success
     63  *	NULL on failure
     64  */
     65 datum
     66 dbm_fetch(DBM *db, datum key)
     67 {
     68 	datum retdata;
     69 	int status;
     70 	DBT dbtkey, dbtretdata;
     71 
     72 	dbtkey.data = key.dptr;
     73 	dbtkey.size = key.dsize;
     74 	status = (db->get)(db, &dbtkey, &dbtretdata, 0);
     75 	if (status) {
     76 		dbtretdata.data = NULL;
     77 		dbtretdata.size = 0;
     78 	}
     79 	retdata.dptr = dbtretdata.data;
     80 	retdata.dsize = datum_truncate(dbtretdata.size);
     81 	return (retdata);
     82 }
     83 
     84 /*
     85  * Returns:
     86  *	DATUM on success
     87  *	NULL on failure
     88  */
     89 datum
     90 dbm_firstkey(DBM *db)
     91 {
     92 	int status;
     93 	datum retkey;
     94 	DBT dbtretkey, dbtretdata;
     95 
     96 	status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
     97 	if (status)
     98 		dbtretkey.data = NULL;
     99 	retkey.dptr = dbtretkey.data;
    100 	retkey.dsize = datum_truncate(dbtretkey.size);
    101 	return (retkey);
    102 }
    103 
    104 /*
    105  * Returns:
    106  *	DATUM on success
    107  *	NULL on failure
    108  */
    109 datum
    110 dbm_nextkey(DBM *db)
    111 {
    112 	int status;
    113 	datum retkey;
    114 	DBT dbtretkey, dbtretdata;
    115 
    116 	status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
    117 	if (status)
    118 		dbtretkey.data = NULL;
    119 	retkey.dptr = dbtretkey.data;
    120 	retkey.dsize = datum_truncate(dbtretkey.size);
    121 	return (retkey);
    122 }
    123 
    124 /*
    125  * Returns:
    126  *	 0 on success
    127  *	<0 failure
    128  */
    129 int
    130 dbm_delete(DBM *db, datum key)
    131 {
    132 	int status;
    133 	DBT dbtkey;
    134 
    135 	dbtkey.data = key.dptr;
    136 	dbtkey.size = key.dsize;
    137 	status = (db->del)(db, &dbtkey, 0);
    138 	if (status)
    139 		return (-1);
    140 	else
    141 		return (0);
    142 }
    143 
    144 /*
    145  * Returns:
    146  *	 0 on success
    147  *	<0 failure
    148  *	 1 if DBM_INSERT and entry exists
    149  */
    150 int
    151 dbm_store(DBM *db, datum key, datum data, int flags)
    152 {
    153 	DBT dbtkey, dbtdata;
    154 
    155 	dbtkey.data = key.dptr;
    156 	dbtkey.size = key.dsize;
    157 	dbtdata.data = data.dptr;
    158 	dbtdata.size = data.dsize;
    159 	return ((db->put)(db, &dbtkey, &dbtdata,
    160 	    (u_int)((flags == DBM_INSERT) ? R_NOOVERWRITE : 0)));
    161 }
    162