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
228
229
230
231
232
233
234
|
/* $NetBSD: db.h,v 1.13 1994/10/26 00:55:48 cgd Exp $ */
/*-
* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)db.h 8.7 (Berkeley) 6/16/94
*/
#ifndef _DB_H_
#define _DB_H_
#include <sys/types.h>
#include <sys/cdefs.h>
#include <limits.h>
#define RET_ERROR -1 /* Return values. */
#define RET_SUCCESS 0
#define RET_SPECIAL 1
#ifndef __BIT_TYPES_DEFINED__
#define __BIT_TYPES_DEFINED__
typedef __signed char int8_t;
typedef unsigned char u_int8_t;
typedef short int16_t;
typedef unsigned short u_int16_t;
typedef int int32_t;
typedef unsigned int u_int32_t;
#ifdef WE_DONT_NEED_QUADS
typedef long long int64_t;
typedef unsigned long long u_int64_t;
#endif
#endif
#define MAX_PAGE_NUMBER 0xffffffff /* >= # of pages in a file */
typedef u_int32_t pgno_t;
#define MAX_PAGE_OFFSET 65535 /* >= # of bytes in a page */
typedef u_int16_t indx_t;
#define MAX_REC_NUMBER 0xffffffff /* >= # of records in a tree */
typedef u_int32_t recno_t;
/* Key/data structure -- a Data-Base Thang. */
typedef struct {
void *data; /* data */
size_t size; /* data length */
} DBT;
/* Routine flags. */
#define R_CURSOR 1 /* del, put, seq */
#define __R_UNUSED 2 /* UNUSED */
#define R_FIRST 3 /* seq */
#define R_IAFTER 4 /* put (RECNO) */
#define R_IBEFORE 5 /* put (RECNO) */
#define R_LAST 6 /* seq (BTREE, RECNO) */
#define R_NEXT 7 /* seq */
#define R_NOOVERWRITE 8 /* put */
#define R_PREV 9 /* seq (BTREE, RECNO) */
#define R_SETCURSOR 10 /* put (RECNO) */
#define R_RECNOSYNC 11 /* sync (RECNO) */
typedef enum { DB_BTREE, DB_HASH, DB_RECNO } DBTYPE;
/*
* !!!
* The following flags are included in the dbopen(3) call as part of the
* open(2) flags. In order to avoid conflicts with the open flags, start
* at the top of the 16 or 32-bit number space and work our way down. If
* the open flags were significantly expanded in the future, it could be
* a problem. Wish I'd left another flags word in the dbopen call.
*
* !!!
* None of this stuff is implemented yet. The only reason that it's here
* is so that the access methods can skip copying the key/data pair when
* the DB_LOCK flag isn't set.
*/
#if UINT_MAX > 65535
#define DB_LOCK 0x20000000 /* Do locking. */
#define DB_SHMEM 0x40000000 /* Use shared memory. */
#define DB_TXN 0x80000000 /* Do transactions. */
#else
#define DB_LOCK 0x2000 /* Do locking. */
#define DB_SHMEM 0x4000 /* Use shared memory. */
#define DB_TXN 0x8000 /* Do transactions. */
#endif
/* Access method description structure. */
typedef struct __db {
DBTYPE type; /* Underlying db type. */
int (*close) __P((struct __db *));
int (*del) __P((const struct __db *, const DBT *, u_int));
int (*get) __P((const struct __db *, const DBT *, DBT *, u_int));
int (*put) __P((const struct __db *, DBT *, const DBT *, u_int));
int (*seq) __P((const struct __db *, DBT *, DBT *, u_int));
int (*sync) __P((const struct __db *, u_int));
void *internal; /* Access method private. */
int (*fd) __P((const struct __db *));
} DB;
#define BTREEMAGIC 0x053162
#define BTREEVERSION 3
/* Structure used to pass parameters to the btree routines. */
typedef struct {
#define R_DUP 0x01 /* duplicate keys */
u_long flags;
u_int cachesize; /* bytes to cache */
int maxkeypage; /* maximum keys per page */
int minkeypage; /* minimum keys per page */
u_int psize; /* page size */
int (*compare) /* comparison function */
__P((const DBT *, const DBT *));
size_t (*prefix) /* prefix function */
__P((const DBT *, const DBT *));
int lorder; /* byte order */
} BTREEINFO;
#define HASHMAGIC 0x061561
#define HASHVERSION 2
/* Structure used to pass parameters to the hashing routines. */
typedef struct {
u_int bsize; /* bucket size */
u_int ffactor; /* fill factor */
u_int nelem; /* number of elements */
u_int cachesize; /* bytes to cache */
u_int32_t /* hash function */
(*hash) __P((const void *, size_t));
int lorder; /* byte order */
} HASHINFO;
/* Structure used to pass parameters to the record routines. */
typedef struct {
#define R_FIXEDLEN 0x01 /* fixed-length records */
#define R_NOKEY 0x02 /* key not required */
#define R_SNAPSHOT 0x04 /* snapshot the input */
u_long flags;
u_int cachesize; /* bytes to cache */
u_int psize; /* page size */
int lorder; /* byte order */
size_t reclen; /* record length (fixed-length records) */
u_char bval; /* delimiting byte (variable-length records */
char *bfname; /* btree file name */
} RECNOINFO;
#ifdef __DBINTERFACE_PRIVATE
/*
* Little endian <==> big endian 32-bit swap macros.
* M_32_SWAP swap a memory location
* P_32_SWAP swap a referenced memory location
* P_32_COPY swap from one location to another
*/
#define M_32_SWAP(a) { \
u_int32_t _tmp = a; \
((char *)&a)[0] = ((char *)&_tmp)[3]; \
((char *)&a)[1] = ((char *)&_tmp)[2]; \
((char *)&a)[2] = ((char *)&_tmp)[1]; \
((char *)&a)[3] = ((char *)&_tmp)[0]; \
}
#define P_32_SWAP(a) { \
u_int32_t _tmp = *(u_int32_t *)a; \
((char *)a)[0] = ((char *)&_tmp)[3]; \
((char *)a)[1] = ((char *)&_tmp)[2]; \
((char *)a)[2] = ((char *)&_tmp)[1]; \
((char *)a)[3] = ((char *)&_tmp)[0]; \
}
#define P_32_COPY(a, b) { \
((char *)&(b))[0] = ((char *)&(a))[3]; \
((char *)&(b))[1] = ((char *)&(a))[2]; \
((char *)&(b))[2] = ((char *)&(a))[1]; \
((char *)&(b))[3] = ((char *)&(a))[0]; \
}
/*
* Little endian <==> big endian 16-bit swap macros.
* M_16_SWAP swap a memory location
* P_16_SWAP swap a referenced memory location
* P_16_COPY swap from one location to another
*/
#define M_16_SWAP(a) { \
u_int16_t _tmp = a; \
((char *)&a)[0] = ((char *)&_tmp)[1]; \
((char *)&a)[1] = ((char *)&_tmp)[0]; \
}
#define P_16_SWAP(a) { \
u_int16_t _tmp = *(u_int16_t *)a; \
((char *)a)[0] = ((char *)&_tmp)[1]; \
((char *)a)[1] = ((char *)&_tmp)[0]; \
}
#define P_16_COPY(a, b) { \
((char *)&(b))[0] = ((char *)&(a))[1]; \
((char *)&(b))[1] = ((char *)&(a))[0]; \
}
#endif
__BEGIN_DECLS
DB *dbopen __P((const char *, int, int, DBTYPE, const void *));
#ifdef __DBINTERFACE_PRIVATE
DB *__bt_open __P((const char *, int, int, const BTREEINFO *, int));
DB *__hash_open __P((const char *, int, int, const HASHINFO *, int));
DB *__rec_open __P((const char *, int, int, const RECNOINFO *, int));
void __dbpanic __P((DB *dbp));
#endif
__END_DECLS
#endif /* !_DB_H_ */
|
