1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)db.h 8.7 (Berkeley) 6/16/94 34 * $FreeBSD: src/include/db.h,v 1.5 2002/03/26 01:35:05 bde Exp $ 35 */ 36 37 #ifndef _DB_H_ 38 #define _DB_H_ 39 40 #include <sys/types.h> 41 #include <sys/cdefs.h> 42 #include <sys/config.h> 43 44 #include <limits.h> 45 46 #define RET_ERROR -1 /* Return values. */ 47 #define RET_SUCCESS 0 48 #define RET_SPECIAL 1 49 50 #define MAX_PAGE_NUMBER 0xffffffff /* >= # of pages in a file */ 51 typedef __uint32_t pgno_t; 52 #define MAX_PAGE_OFFSET 65535 /* >= # of bytes in a page */ 53 typedef __uint16_t indx_t; 54 #define MAX_REC_NUMBER 0xffffffff /* >= # of records in a tree */ 55 typedef __uint32_t recno_t; 56 57 /* Key/data structure -- a Data-Base Thang. */ 58 typedef struct { 59 void *data; /* data */ 60 size_t size; /* data length */ 61 } DBT; 62 63 /* Routine flags. */ 64 #define R_CURSOR 1 /* del, put, seq */ 65 #define __R_UNUSED 2 /* UNUSED */ 66 #define R_FIRST 3 /* seq */ 67 #define R_IAFTER 4 /* put (RECNO) */ 68 #define R_IBEFORE 5 /* put (RECNO) */ 69 #define R_LAST 6 /* seq (BTREE, RECNO) */ 70 #define R_NEXT 7 /* seq */ 71 #define R_NOOVERWRITE 8 /* put */ 72 #define R_PREV 9 /* seq (BTREE, RECNO) */ 73 #define R_SETCURSOR 10 /* put (RECNO) */ 74 #define R_RECNOSYNC 11 /* sync (RECNO) */ 75 76 typedef enum { DB_BTREE, DB_HASH, DB_RECNO } DBTYPE; 77 78 /* 79 * !!! 80 * The following flags are included in the dbopen(3) call as part of the 81 * open(2) flags. In order to avoid conflicts with the open flags, start 82 * at the top of the 16 or 32-bit number space and work our way down. If 83 * the open flags were significantly expanded in the future, it could be 84 * a problem. Wish I'd left another flags word in the dbopen call. 85 * 86 * !!! 87 * None of this stuff is implemented yet. The only reason that it's here 88 * is so that the access methods can skip copying the key/data pair when 89 * the DB_LOCK flag isn't set. 90 */ 91 #if UINT_MAX > 65535 92 #define DB_LOCK 0x20000000 /* Do locking. */ 93 #define DB_SHMEM 0x40000000 /* Use shared memory. */ 94 #define DB_TXN 0x80000000 /* Do transactions. */ 95 #else 96 #define DB_LOCK 0x2000 /* Do locking. */ 97 #define DB_SHMEM 0x4000 /* Use shared memory. */ 98 #define DB_TXN 0x8000 /* Do transactions. */ 99 #endif 100 101 /* Access method description structure. */ 102 typedef struct __db { 103 DBTYPE type; /* Underlying db type. */ 104 int (*close)(struct __db *); 105 int (*del)(const struct __db *, const DBT *, u_int); 106 int (*get)(const struct __db *, const DBT *, DBT *, u_int); 107 int (*put)(const struct __db *, DBT *, const DBT *, u_int); 108 int (*seq)(const struct __db *, DBT *, DBT *, u_int); 109 int (*sync)(const struct __db *, u_int); 110 void *internal; /* Access method private. */ 111 int (*fd)(const struct __db *); 112 } DB; 113 114 #define BTREEMAGIC 0x053162 115 #define BTREEVERSION 3 116 117 /* Structure used to pass parameters to the btree routines. */ 118 typedef struct { 119 #define R_DUP 0x01 /* duplicate keys */ 120 u_long flags; 121 u_int cachesize; /* bytes to cache */ 122 int maxkeypage; /* maximum keys per page */ 123 int minkeypage; /* minimum keys per page */ 124 u_int psize; /* page size */ 125 int (*compare) /* comparison function */ 126 (const DBT *, const DBT *); 127 size_t (*prefix) /* prefix function */ 128 (const DBT *, const DBT *); 129 int lorder; /* byte order */ 130 } BTREEINFO; 131 132 #define HASHMAGIC 0x061561 133 #define HASHVERSION 2 134 135 /* Structure used to pass parameters to the hashing routines. */ 136 typedef struct { 137 u_int bsize; /* bucket size */ 138 u_int ffactor; /* fill factor */ 139 u_int nelem; /* number of elements */ 140 u_int cachesize; /* bytes to cache */ 141 __uint32_t /* hash function */ 142 (*hash)(const void *, size_t); 143 int lorder; /* byte order */ 144 } HASHINFO; 145 146 /* Structure used to pass parameters to the record routines. */ 147 typedef struct { 148 #define R_FIXEDLEN 0x01 /* fixed-length records */ 149 #define R_NOKEY 0x02 /* key not required */ 150 #define R_SNAPSHOT 0x04 /* snapshot the input */ 151 u_long flags; 152 u_int cachesize; /* bytes to cache */ 153 u_int psize; /* page size */ 154 int lorder; /* byte order */ 155 size_t reclen; /* record length (fixed-length records) */ 156 u_char bval; /* delimiting byte (variable-length records */ 157 char *bfname; /* btree file name */ 158 } RECNOINFO; 159 160 /* 161 * Little endian <==> big endian 32-bit swap macros. 162 * M_32_SWAP swap a memory location 163 * P_32_SWAP swap a referenced memory location 164 * P_32_COPY swap from one location to another 165 */ 166 #define M_32_SWAP(a) { \ 167 __uint32_t _tmp = a; \ 168 ((char *)&a)[0] = ((char *)&_tmp)[3]; \ 169 ((char *)&a)[1] = ((char *)&_tmp)[2]; \ 170 ((char *)&a)[2] = ((char *)&_tmp)[1]; \ 171 ((char *)&a)[3] = ((char *)&_tmp)[0]; \ 172 } 173 #define P_32_SWAP(a) { \ 174 __uint32_t _tmp = *(__uint32_t *)a; \ 175 ((char *)a)[0] = ((char *)&_tmp)[3]; \ 176 ((char *)a)[1] = ((char *)&_tmp)[2]; \ 177 ((char *)a)[2] = ((char *)&_tmp)[1]; \ 178 ((char *)a)[3] = ((char *)&_tmp)[0]; \ 179 } 180 #define P_32_COPY(a, b) { \ 181 ((char *)&(b))[0] = ((char *)&(a))[3]; \ 182 ((char *)&(b))[1] = ((char *)&(a))[2]; \ 183 ((char *)&(b))[2] = ((char *)&(a))[1]; \ 184 ((char *)&(b))[3] = ((char *)&(a))[0]; \ 185 } 186 187 /* 188 * Little endian <==> big endian 16-bit swap macros. 189 * M_16_SWAP swap a memory location 190 * P_16_SWAP swap a referenced memory location 191 * P_16_COPY swap from one location to another 192 */ 193 #define M_16_SWAP(a) { \ 194 __uint16_t _tmp = a; \ 195 ((char *)&a)[0] = ((char *)&_tmp)[1]; \ 196 ((char *)&a)[1] = ((char *)&_tmp)[0]; \ 197 } 198 #define P_16_SWAP(a) { \ 199 __uint16_t _tmp = *(__uint16_t *)a; \ 200 ((char *)a)[0] = ((char *)&_tmp)[1]; \ 201 ((char *)a)[1] = ((char *)&_tmp)[0]; \ 202 } 203 #define P_16_COPY(a, b) { \ 204 ((char *)&(b))[0] = ((char *)&(a))[1]; \ 205 ((char *)&(b))[1] = ((char *)&(a))[0]; \ 206 } 207 208 __BEGIN_DECLS 209 DB *dbopen(const char *, int, int, DBTYPE, const void *); 210 211 #ifdef __DBINTERFACE_PRIVATE 212 DB *__bt_open(const char *, int, int, const BTREEINFO *, int); 213 DB *__hash_open(const char *, int, int, const HASHINFO *, int); 214 DB *__rec_open(const char *, int, int, const RECNOINFO *, int); 215 void __dbpanic(DB *dbp); 216 #endif 217 __END_DECLS 218 #endif /* !_DB_H_ */ 219