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ndbmdatum.c revision 1.4.6.2 
      1 /*	$NetBSD: ndbmdatum.c,v 1.4.6.2 2008/09/11 12:58:01 joerg 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 1.4.6.2 2008/09/11 12:58:01 joerg 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 /*
     58  * Returns:
     59  *	DATUM on success
     60  *	NULL on failure
     61  */
     62 datum
     63 dbm_fetch(DBM *db, datum key)
     64 {
     65 	datum retdata;
     66 	int status;
     67 	DBT dbtkey, dbtretdata;
     68 
     69 	dbtkey.data = key.dptr;
     70 	dbtkey.size = key.dsize;
     71 	status = (db->get)(db, &dbtkey, &dbtretdata, 0);
     72 	if (status) {
     73 		dbtretdata.data = NULL;
     74 		dbtretdata.size = 0;
     75 	}
     76 	retdata.dptr = dbtretdata.data;
     77 	retdata.dsize = dbtretdata.size;
     78 	return (retdata);
     79 }
     80 
     81 /*
     82  * Returns:
     83  *	DATUM on success
     84  *	NULL on failure
     85  */
     86 datum
     87 dbm_firstkey(DBM *db)
     88 {
     89 	int status;
     90 	datum retkey;
     91 	DBT dbtretkey, dbtretdata;
     92 
     93 	status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
     94 	if (status)
     95 		dbtretkey.data = NULL;
     96 	retkey.dptr = dbtretkey.data;
     97 	retkey.dsize = dbtretkey.size;
     98 	return (retkey);
     99 }
    100 
    101 /*
    102  * Returns:
    103  *	DATUM on success
    104  *	NULL on failure
    105  */
    106 datum
    107 dbm_nextkey(DBM *db)
    108 {
    109 	int status;
    110 	datum retkey;
    111 	DBT dbtretkey, dbtretdata;
    112 
    113 	status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
    114 	if (status)
    115 		dbtretkey.data = NULL;
    116 	retkey.dptr = dbtretkey.data;
    117 	retkey.dsize = dbtretkey.size;
    118 	return (retkey);
    119 }
    120 
    121 /*
    122  * Returns:
    123  *	 0 on success
    124  *	<0 failure
    125  */
    126 int
    127 dbm_delete(DBM *db, datum key)
    128 {
    129 	int status;
    130 	DBT dbtkey;
    131 
    132 	dbtkey.data = key.dptr;
    133 	dbtkey.size = key.dsize;
    134 	status = (db->del)(db, &dbtkey, 0);
    135 	if (status)
    136 		return (-1);
    137 	else
    138 		return (0);
    139 }
    140 
    141 /*
    142  * Returns:
    143  *	 0 on success
    144  *	<0 failure
    145  *	 1 if DBM_INSERT and entry exists
    146  */
    147 int
    148 dbm_store(DBM *db, datum key, datum data, int flags)
    149 {
    150 	DBT dbtkey, dbtdata;
    151 
    152 	dbtkey.data = key.dptr;
    153 	dbtkey.size = key.dsize;
    154 	dbtdata.data = data.dptr;
    155 	dbtdata.size = data.dsize;
    156 	return ((db->put)(db, &dbtkey, &dbtdata,
    157 	    (u_int)((flags == DBM_INSERT) ? R_NOOVERWRITE : 0)));
    158 }
    159