1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Margo Seltzer.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)ndbm.c 8.4 (Berkeley) 7/21/94";
37 #endif /* LIBC_SCCS and not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$ : src/lib/libc/db/hash/ndbm.c Nov 20 19:49:47 2017 UTC by pfg - SVN Revision 326025");
40
41 /*
42 * This package provides a dbm compatible interface to the new hashing
43 * package described in db(3).
44 */
45
46 #include <sys/param.h>
47
48 #include <stdio.h>
49 #include <string.h>
50 #include <errno.h>
51
52 #include <ndbm.h>
53 #include "hash.h"
54
55 #define __DBINTERFACE_PRIVATE /* activate prototypes from db_local.h */
56 #include "db_local.h"
57
58 /*
59 * Returns:
60 * *DBM on success
61 * NULL on failure
62 */
63 extern DBM *
dbm_open(const char * file,int flags,mode_t mode)64 dbm_open(const char *file, int flags, mode_t mode)
65 {
66 HASHINFO info;
67 char path[MAXPATHLEN];
68
69 info.bsize = 4096;
70 info.ffactor = 40;
71 info.nelem = 1;
72 info.cachesize = 0;
73 info.hash = NULL;
74 info.lorder = 0;
75
76 if( strlen(file) >= sizeof(path) - strlen(DBM_SUFFIX)) {
77 errno = ENAMETOOLONG;
78 return(NULL);
79 }
80 (void)strcpy(path, file);
81 (void)strcat(path, DBM_SUFFIX);
82 return ((DBM *)__hash_open(path, flags, mode, 0, &info));
83 }
84
85 extern void
dbm_close(DBM * db)86 dbm_close(DBM *db)
87 {
88 (void)(db->close)(db);
89 }
90
91 /*
92 * Returns:
93 * DATUM on success
94 * NULL on failure
95 */
96 extern datum
dbm_fetch(DBM * db,datum key)97 dbm_fetch(DBM *db, datum key)
98 {
99 datum retdata;
100 int status;
101 DBT dbtkey, dbtretdata;
102
103 dbtkey.data = key.dptr;
104 dbtkey.size = key.dsize;
105 status = (db->get)(db, &dbtkey, &dbtretdata, 0);
106 if (status) {
107 dbtretdata.data = NULL;
108 dbtretdata.size = 0;
109 }
110 retdata.dptr = dbtretdata.data;
111 retdata.dsize = dbtretdata.size;
112 return (retdata);
113 }
114
115 /*
116 * Returns:
117 * DATUM on success
118 * NULL on failure
119 */
120 extern datum
dbm_firstkey(DBM * db)121 dbm_firstkey(DBM *db)
122 {
123 int status;
124 datum retkey;
125 DBT dbtretkey, dbtretdata;
126
127 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
128 if (status)
129 dbtretkey.data = NULL;
130 retkey.dptr = dbtretkey.data;
131 retkey.dsize = dbtretkey.size;
132 return (retkey);
133 }
134
135 /*
136 * Returns:
137 * DATUM on success
138 * NULL on failure
139 */
140 extern datum
dbm_nextkey(DBM * db)141 dbm_nextkey(DBM *db)
142 {
143 int status;
144 datum retkey;
145 DBT dbtretkey, dbtretdata;
146
147 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
148 if (status)
149 dbtretkey.data = NULL;
150 retkey.dptr = dbtretkey.data;
151 retkey.dsize = dbtretkey.size;
152 return (retkey);
153 }
154
155 /*
156 * Returns:
157 * 0 on success
158 * <0 failure
159 */
160 extern int
dbm_delete(DBM * db,datum key)161 dbm_delete(DBM *db, datum key)
162 {
163 int status;
164 DBT dbtkey;
165
166 dbtkey.data = key.dptr;
167 dbtkey.size = key.dsize;
168 status = (db->del)(db, &dbtkey, 0);
169 if (status)
170 return (-1);
171 else
172 return (0);
173 }
174
175 /*
176 * Returns:
177 * 0 on success
178 * <0 failure
179 * 1 if DBM_INSERT and entry exists
180 */
181 extern int
dbm_store(DBM * db,datum key,datum data,int flags)182 dbm_store(DBM *db, datum key, datum data, int flags)
183 {
184 DBT dbtkey, dbtdata;
185
186 dbtkey.data = key.dptr;
187 dbtkey.size = key.dsize;
188 dbtdata.data = data.dptr;
189 dbtdata.size = data.dsize;
190 return ((db->put)(db, &dbtkey, &dbtdata,
191 (flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
192 }
193
194 extern int
dbm_error(DBM * db)195 dbm_error(DBM *db)
196 {
197 HTAB *hp;
198
199 hp = (HTAB *)db->internal;
200 return (hp->error);
201 }
202
203 extern int
dbm_clearerr(DBM * db)204 dbm_clearerr(DBM *db)
205 {
206 HTAB *hp;
207
208 hp = (HTAB *)db->internal;
209 hp->error = 0;
210 return (0);
211 }
212
213 extern int
dbm_dirfno(DBM * db)214 dbm_dirfno(DBM *db)
215 {
216 return(((HTAB *)db->internal)->fp);
217 }
218
