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
dbm_fetch(DBM * db,datum key)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
dbm_firstkey(DBM * db)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
dbm_nextkey(DBM * db)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
dbm_delete(DBM * db,datum key)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
dbm_store(DBM * db,datum key,datum data,int flags)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