summaryrefslogtreecommitdiffstats
path: root/include/apr_dbm.h
blob: ad1b4f391eda9b1b4116fe59a94f8e0363364c05 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef APR_DBM_H
#define APR_DBM_H

#include "apu.h"
#include "apr.h"
#include "apr_errno.h"
#include "apr_pools.h"
#include "apr_file_info.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @file apr_dbm.h
 * @brief APR-UTIL DBM library
 */
/** 
 * @defgroup APR_Util_DBM DBM routines
 * @ingroup APR_Util
 * @{
 */
/**
 * Structure for referencing a dbm
 */
typedef struct apr_dbm_t apr_dbm_t;

/**
 * Structure for referencing the datum record within a dbm
 */
typedef struct
{
    /** pointer to the 'data' to retrieve/store in the DBM */
    char *dptr;
    /** size of the 'data' to retrieve/store in the DBM */
    apr_size_t dsize;
} apr_datum_t;

/* modes to open the DB */
#define APR_DBM_READONLY        1       /**< open for read-only access */
#define APR_DBM_READWRITE       2       /**< open for read-write access */
#define APR_DBM_RWCREATE        3       /**< open for r/w, create if needed */
#define APR_DBM_RWTRUNC         4       /**< open for r/w, truncating an existing
                                          DB if present */
/**
 * Open a dbm file by file name and type of DBM
 * @param dbm The newly opened database
 * @param type The type of the DBM (not all may be available at run time)
 * <pre>
 *  db   for Berkeley DB files
 *  gdbm for GDBM files
 *  ndbm for NDBM files
 *  sdbm for SDBM files (always available)
 *  default for the default DBM type
 *  </pre>
 * @param name The dbm file name to open
 * @param mode The flag value
 * <PRE>
 *           APR_DBM_READONLY   open for read-only access
 *           APR_DBM_READWRITE  open for read-write access
 *           APR_DBM_RWCREATE   open for r/w, create if needed
 *           APR_DBM_RWTRUNC    open for r/w, truncate if already there
 * </PRE>
 * @param perm Permissions to apply to if created
 * @param cntxt The pool to use when creating the dbm
 * @remark The dbm name may not be a true file name, as many dbm packages
 * append suffixes for seperate data and index files.
 * @bug In apr-util 0.9 and 1.x, the type arg was case insensitive.  This
 * was highly inefficient, and as of 2.x the dbm name must be provided in
 * the correct case (lower case for all bundled providers)
 */

APU_DECLARE(apr_status_t) apr_dbm_open_ex(apr_dbm_t **dbm, const char* type, 
                                       const char *name, 
                                       apr_int32_t mode, apr_fileperms_t perm,
                                       apr_pool_t *cntxt);


/**
 * Open a dbm file by file name
 * @param dbm The newly opened database
 * @param name The dbm file name to open
 * @param mode The flag value
 * <PRE>
 *           APR_DBM_READONLY   open for read-only access
 *           APR_DBM_READWRITE  open for read-write access
 *           APR_DBM_RWCREATE   open for r/w, create if needed
 *           APR_DBM_RWTRUNC    open for r/w, truncate if already there
 * </PRE>
 * @param perm Permissions to apply to if created
 * @param cntxt The pool to use when creating the dbm
 * @remark The dbm name may not be a true file name, as many dbm packages
 * append suffixes for seperate data and index files.
 */
APU_DECLARE(apr_status_t) apr_dbm_open(apr_dbm_t **dbm, const char *name, 
                                       apr_int32_t mode, apr_fileperms_t perm,
                                       apr_pool_t *cntxt);

/**
 * Close a dbm file previously opened by apr_dbm_open
 * @param dbm The database to close
 */
APU_DECLARE(void) apr_dbm_close(apr_dbm_t *dbm);

/**
 * Fetch a dbm record value by key
 * @param dbm The database 
 * @param key The key datum to find this record
 * @param pvalue The value datum retrieved for this record
 */
APU_DECLARE(apr_status_t) apr_dbm_fetch(apr_dbm_t *dbm, apr_datum_t key,
                                        apr_datum_t *pvalue);
/**
 * Store a dbm record value by key
 * @param dbm The database 
 * @param key The key datum to store this record by
 * @param value The value datum to store in this record
 */
APU_DECLARE(apr_status_t) apr_dbm_store(apr_dbm_t *dbm, apr_datum_t key, 
                                        apr_datum_t value);

/**
 * Delete a dbm record value by key
 * @param dbm The database 
 * @param key The key datum of the record to delete
 * @remark It is not an error to delete a non-existent record.
 */
APU_DECLARE(apr_status_t) apr_dbm_delete(apr_dbm_t *dbm, apr_datum_t key);

/**
 * Search for a key within the dbm
 * @param dbm The database 
 * @param key The datum describing a key to test
 */
APU_DECLARE(int) apr_dbm_exists(apr_dbm_t *dbm, apr_datum_t key);

/**
 * Retrieve the first record key from a dbm
 * @param dbm The database 
 * @param pkey The key datum of the first record
 */
APU_DECLARE(apr_status_t) apr_dbm_firstkey(apr_dbm_t *dbm, apr_datum_t *pkey);

/**
 * Retrieve the next record key from a dbm
 * @param dbm The database 
 * @param pkey The key datum of the next record
 */
APU_DECLARE(apr_status_t) apr_dbm_nextkey(apr_dbm_t *dbm, apr_datum_t *pkey);

/**
 * Proactively toss any memory associated with the apr_datum_t.
 * @param dbm The database 
 * @param data The datum to free.
 */
APU_DECLARE(void) apr_dbm_freedatum(apr_dbm_t *dbm, apr_datum_t data);

/**
 * Report more information when an apr_dbm function fails.
 * @param dbm The database
 * @param errcode A DBM-specific value for the error (for logging). If this
 *                isn't needed, it may be NULL.
 * @param errbuf Location to store the error text
 * @param errbufsize The size of the provided buffer
 * @return The errbuf parameter, for convenience.
 */
APU_DECLARE(char *) apr_dbm_geterror(apr_dbm_t *dbm, int *errcode,
                                     char *errbuf, apr_size_t errbufsize);
/**
 * If the specified file/path were passed to apr_dbm_open(), return the
 * actual file/path names which would be (created and) used. At most, two
 * files may be used; used2 may be NULL if only one file is used.
 * @param pool The pool for allocating used1 and used2.
 * @param type The type of DBM you require info on @see apr_dbm_open_ex
 * @param pathname The path name to generate used-names from.
 * @param used1 The first pathname used by the apr_dbm implementation.
 * @param used2 The second pathname used by apr_dbm. If only one file is
 *              used by the specific implementation, this will be set to NULL.
 * @return An error if the specified type is invalid.
 * @remark The dbm file(s) don't need to exist. This function only manipulates
 *      the pathnames.
 */
APU_DECLARE(apr_status_t) apr_dbm_get_usednames_ex(apr_pool_t *pool,
                                                   const char *type,
                                                   const char *pathname,
                                                   const char **used1,
                                                   const char **used2);

/**
 * If the specified file/path were passed to apr_dbm_open(), return the
 * actual file/path names which would be (created and) used. At most, two
 * files may be used; used2 may be NULL if only one file is used.
 * @param pool The pool for allocating used1 and used2.
 * @param pathname The path name to generate used-names from.
 * @param used1 The first pathname used by the apr_dbm implementation.
 * @param used2 The second pathname used by apr_dbm. If only one file is
 *              used by the specific implementation, this will be set to NULL.
 * @remark The dbm file(s) don't need to exist. This function only manipulates
 *      the pathnames.
 */
APU_DECLARE(void) apr_dbm_get_usednames(apr_pool_t *pool,
                                        const char *pathname,
                                        const char **used1,
                                        const char **used2);

/** @} */
#ifdef __cplusplus
}
#endif

#endif	/* !APR_DBM_H */