2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990, 1993, 1994
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35 #include <sys/types.h>
36 #include <sys/cdefs.h>
40 #define RET_ERROR -1 /* Return values. */
44 #define MAX_PAGE_NUMBER 0xffffffff /* >= # of pages in a file */
45 typedef uint32_t pgno_t;
46 #define MAX_PAGE_OFFSET 65535 /* >= # of bytes in a page */
47 typedef uint16_t indx_t;
48 #define MAX_REC_NUMBER 0xffffffff /* >= # of records in a tree */
49 typedef uint32_t recno_t;
51 /* Key/data structure -- a Data-Base Thang. */
53 void *data; /* data */
54 size_t size; /* data length */
58 #define R_CURSOR 1 /* del, put, seq */
59 #define __R_UNUSED 2 /* UNUSED */
60 #define R_FIRST 3 /* seq */
61 #define R_IAFTER 4 /* put (RECNO) */
62 #define R_IBEFORE 5 /* put (RECNO) */
63 #define R_LAST 6 /* seq (BTREE, RECNO) */
64 #define R_NEXT 7 /* seq */
65 #define R_NOOVERWRITE 8 /* put */
66 #define R_PREV 9 /* seq (BTREE, RECNO) */
67 #define R_SETCURSOR 10 /* put (RECNO) */
68 #define R_RECNOSYNC 11 /* sync (RECNO) */
70 typedef enum { DB_BTREE, DB_HASH, DB_RECNO } DBTYPE;
74 * The following flags are included in the dbopen(3) call as part of the
75 * open(2) flags. In order to avoid conflicts with the open flags, start
76 * at the top of the 16 or 32-bit number space and work our way down. If
77 * the open flags were significantly expanded in the future, it could be
78 * a problem. Wish I'd left another flags word in the dbopen call.
81 * None of this stuff is implemented yet. The only reason that it's here
82 * is so that the access methods can skip copying the key/data pair when
83 * the DB_LOCK flag isn't set.
86 #define DB_LOCK 0x20000000 /* Do locking. */
87 #define DB_SHMEM 0x40000000 /* Use shared memory. */
88 #define DB_TXN 0x80000000 /* Do transactions. */
90 #define DB_LOCK 0x2000 /* Do locking. */
91 #define DB_SHMEM 0x4000 /* Use shared memory. */
92 #define DB_TXN 0x8000 /* Do transactions. */
95 /* Access method description structure. */
97 DBTYPE type; /* Underlying db type. */
98 int (*close)(struct __db *);
99 int (*del)(const struct __db *, const DBT *, unsigned int);
100 int (*get)(const struct __db *, const DBT *, DBT *, unsigned int);
101 int (*put)(const struct __db *, DBT *, const DBT *, unsigned int);
102 int (*seq)(const struct __db *, DBT *, DBT *, unsigned int);
103 int (*sync)(const struct __db *, unsigned int);
104 void *internal; /* Access method private. */
105 int (*fd)(const struct __db *);
108 #define BTREEMAGIC 0x053162
109 #define BTREEVERSION 3
111 /* Structure used to pass parameters to the btree routines. */
113 #define R_DUP 0x01 /* duplicate keys */
115 unsigned int cachesize; /* bytes to cache */
116 int maxkeypage; /* maximum keys per page */
117 int minkeypage; /* minimum keys per page */
118 unsigned int psize; /* page size */
119 int (*compare) /* comparison function */
120 (const DBT *, const DBT *);
121 size_t (*prefix) /* prefix function */
122 (const DBT *, const DBT *);
123 int lorder; /* byte order */
126 #define HASHMAGIC 0x061561
127 #define HASHVERSION 2
129 /* Structure used to pass parameters to the hashing routines. */
131 unsigned int bsize; /* bucket size */
132 unsigned int ffactor; /* fill factor */
133 unsigned int nelem; /* number of elements */
134 unsigned int cachesize; /* bytes to cache */
135 uint32_t /* hash function */
136 (*hash)(const void *, size_t);
137 int lorder; /* byte order */
140 /* Structure used to pass parameters to the record routines. */
142 #define R_FIXEDLEN 0x01 /* fixed-length records */
143 #define R_NOKEY 0x02 /* key not required */
144 #define R_SNAPSHOT 0x04 /* snapshot the input */
146 unsigned int cachesize; /* bytes to cache */
147 unsigned int psize; /* page size */
148 int lorder; /* byte order */
149 size_t reclen; /* record length (fixed-length records) */
150 unsigned char bval; /* delimiting byte (variable-length records */
151 char *bfname; /* btree file name */
154 #ifdef __DBINTERFACE_PRIVATE
156 * Little endian <==> big endian 32-bit swap macros.
157 * M_32_SWAP swap a memory location
158 * P_32_SWAP swap a referenced memory location
159 * P_32_COPY swap from one location to another
161 #define M_32_SWAP(a) { \
163 ((char *)&a)[0] = ((char *)&_tmp)[3]; \
164 ((char *)&a)[1] = ((char *)&_tmp)[2]; \
165 ((char *)&a)[2] = ((char *)&_tmp)[1]; \
166 ((char *)&a)[3] = ((char *)&_tmp)[0]; \
168 #define P_32_SWAP(a) { \
169 uint32_t _tmp = *(uint32_t *)a; \
170 ((char *)a)[0] = ((char *)&_tmp)[3]; \
171 ((char *)a)[1] = ((char *)&_tmp)[2]; \
172 ((char *)a)[2] = ((char *)&_tmp)[1]; \
173 ((char *)a)[3] = ((char *)&_tmp)[0]; \
175 #define P_32_COPY(a, b) { \
176 ((char *)&(b))[0] = ((char *)&(a))[3]; \
177 ((char *)&(b))[1] = ((char *)&(a))[2]; \
178 ((char *)&(b))[2] = ((char *)&(a))[1]; \
179 ((char *)&(b))[3] = ((char *)&(a))[0]; \
183 * Little endian <==> big endian 16-bit swap macros.
184 * M_16_SWAP swap a memory location
185 * P_16_SWAP swap a referenced memory location
186 * P_16_COPY swap from one location to another
188 #define M_16_SWAP(a) { \
190 ((char *)&a)[0] = ((char *)&_tmp)[1]; \
191 ((char *)&a)[1] = ((char *)&_tmp)[0]; \
193 #define P_16_SWAP(a) { \
194 uint16_t _tmp = *(uint16_t *)a; \
195 ((char *)a)[0] = ((char *)&_tmp)[1]; \
196 ((char *)a)[1] = ((char *)&_tmp)[0]; \
198 #define P_16_COPY(a, b) { \
199 ((char *)&(b))[0] = ((char *)&(a))[1]; \
200 ((char *)&(b))[1] = ((char *)&(a))[0]; \
206 DB *dbopen(const char *, int, int, DBTYPE, const void *);
209 #ifdef __DBINTERFACE_PRIVATE
210 DB *__bt_open(const char *, int, int, const BTREEINFO *, int);
211 DB *__hash_open(const char *, int, int, const HASHINFO *, int);
212 DB *__rec_open(const char *, int, int, const RECNOINFO *, int);
213 void __dbpanic(DB *dbp);