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219 lines
7.5 KiB
C
219 lines
7.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)db.h 8.7 (Berkeley) 6/16/94
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*/
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#ifndef _DB_H_
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#define _DB_H_
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#include <sys/types.h>
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#include <sys/cdefs.h>
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#include <limits.h>
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#define RET_ERROR -1 /* Return values. */
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#define RET_SUCCESS 0
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#define RET_SPECIAL 1
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#define MAX_PAGE_NUMBER 0xffffffff /* >= # of pages in a file */
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typedef uint32_t pgno_t;
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#define MAX_PAGE_OFFSET 65535 /* >= # of bytes in a page */
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typedef uint16_t indx_t;
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#define MAX_REC_NUMBER 0xffffffff /* >= # of records in a tree */
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typedef uint32_t recno_t;
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/* Key/data structure -- a Data-Base Thang. */
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typedef struct {
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void *data; /* data */
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size_t size; /* data length */
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} DBT;
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/* Routine flags. */
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#define R_CURSOR 1 /* del, put, seq */
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#define __R_UNUSED 2 /* UNUSED */
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#define R_FIRST 3 /* seq */
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#define R_IAFTER 4 /* put (RECNO) */
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#define R_IBEFORE 5 /* put (RECNO) */
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#define R_LAST 6 /* seq (BTREE, RECNO) */
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#define R_NEXT 7 /* seq */
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#define R_NOOVERWRITE 8 /* put */
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#define R_PREV 9 /* seq (BTREE, RECNO) */
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#define R_SETCURSOR 10 /* put (RECNO) */
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#define R_RECNOSYNC 11 /* sync (RECNO) */
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typedef enum { DB_BTREE, DB_HASH, DB_RECNO } DBTYPE;
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/*
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* !!!
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* The following flags are included in the dbopen(3) call as part of the
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* open(2) flags. In order to avoid conflicts with the open flags, start
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* at the top of the 16 or 32-bit number space and work our way down. If
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* the open flags were significantly expanded in the future, it could be
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* a problem. Wish I'd left another flags word in the dbopen call.
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*
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* !!!
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* None of this stuff is implemented yet. The only reason that it's here
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* is so that the access methods can skip copying the key/data pair when
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* the DB_LOCK flag isn't set.
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*/
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#if UINT_MAX > 65535
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#define DB_LOCK 0x20000000 /* Do locking. */
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#define DB_SHMEM 0x40000000 /* Use shared memory. */
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#define DB_TXN 0x80000000 /* Do transactions. */
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#else
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#define DB_LOCK 0x2000 /* Do locking. */
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#define DB_SHMEM 0x4000 /* Use shared memory. */
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#define DB_TXN 0x8000 /* Do transactions. */
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#endif
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/* Access method description structure. */
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typedef struct __db {
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DBTYPE type; /* Underlying db type. */
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int (*close)(struct __db *);
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int (*del)(const struct __db *, const DBT *, unsigned int);
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int (*get)(const struct __db *, const DBT *, DBT *, unsigned int);
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int (*put)(const struct __db *, DBT *, const DBT *, unsigned int);
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int (*seq)(const struct __db *, DBT *, DBT *, unsigned int);
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int (*sync)(const struct __db *, unsigned int);
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void *internal; /* Access method private. */
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int (*fd)(const struct __db *);
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} DB;
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#define BTREEMAGIC 0x053162
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#define BTREEVERSION 3
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/* Structure used to pass parameters to the btree routines. */
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typedef struct {
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#define R_DUP 0x01 /* duplicate keys */
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unsigned long flags;
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unsigned int cachesize; /* bytes to cache */
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int maxkeypage; /* maximum keys per page */
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int minkeypage; /* minimum keys per page */
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unsigned int psize; /* page size */
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int (*compare) /* comparison function */
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(const DBT *, const DBT *);
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size_t (*prefix) /* prefix function */
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(const DBT *, const DBT *);
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int lorder; /* byte order */
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} BTREEINFO;
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#define HASHMAGIC 0x061561
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#define HASHVERSION 2
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/* Structure used to pass parameters to the hashing routines. */
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typedef struct {
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unsigned int bsize; /* bucket size */
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unsigned int ffactor; /* fill factor */
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unsigned int nelem; /* number of elements */
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unsigned int cachesize; /* bytes to cache */
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uint32_t /* hash function */
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(*hash)(const void *, size_t);
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int lorder; /* byte order */
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} HASHINFO;
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/* Structure used to pass parameters to the record routines. */
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typedef struct {
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#define R_FIXEDLEN 0x01 /* fixed-length records */
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#define R_NOKEY 0x02 /* key not required */
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#define R_SNAPSHOT 0x04 /* snapshot the input */
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unsigned long flags;
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unsigned int cachesize; /* bytes to cache */
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unsigned int psize; /* page size */
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int lorder; /* byte order */
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size_t reclen; /* record length (fixed-length records) */
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unsigned char bval; /* delimiting byte (variable-length records */
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char *bfname; /* btree file name */
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} RECNOINFO;
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#ifdef __DBINTERFACE_PRIVATE
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/*
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* Little endian <==> big endian 32-bit swap macros.
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* M_32_SWAP swap a memory location
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* P_32_SWAP swap a referenced memory location
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* P_32_COPY swap from one location to another
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*/
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#define M_32_SWAP(a) { \
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uint32_t _tmp = a; \
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((char *)&a)[0] = ((char *)&_tmp)[3]; \
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((char *)&a)[1] = ((char *)&_tmp)[2]; \
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((char *)&a)[2] = ((char *)&_tmp)[1]; \
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((char *)&a)[3] = ((char *)&_tmp)[0]; \
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}
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#define P_32_SWAP(a) { \
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uint32_t _tmp = *(uint32_t *)a; \
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((char *)a)[0] = ((char *)&_tmp)[3]; \
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((char *)a)[1] = ((char *)&_tmp)[2]; \
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((char *)a)[2] = ((char *)&_tmp)[1]; \
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((char *)a)[3] = ((char *)&_tmp)[0]; \
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}
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#define P_32_COPY(a, b) { \
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((char *)&(b))[0] = ((char *)&(a))[3]; \
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((char *)&(b))[1] = ((char *)&(a))[2]; \
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((char *)&(b))[2] = ((char *)&(a))[1]; \
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((char *)&(b))[3] = ((char *)&(a))[0]; \
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}
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/*
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* Little endian <==> big endian 16-bit swap macros.
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* M_16_SWAP swap a memory location
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* P_16_SWAP swap a referenced memory location
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* P_16_COPY swap from one location to another
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*/
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#define M_16_SWAP(a) { \
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uint16_t _tmp = a; \
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((char *)&a)[0] = ((char *)&_tmp)[1]; \
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((char *)&a)[1] = ((char *)&_tmp)[0]; \
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}
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#define P_16_SWAP(a) { \
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uint16_t _tmp = *(uint16_t *)a; \
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((char *)a)[0] = ((char *)&_tmp)[1]; \
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((char *)a)[1] = ((char *)&_tmp)[0]; \
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}
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#define P_16_COPY(a, b) { \
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((char *)&(b))[0] = ((char *)&(a))[1]; \
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((char *)&(b))[1] = ((char *)&(a))[0]; \
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}
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#endif
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__BEGIN_DECLS
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#if __BSD_VISIBLE
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DB *dbopen(const char *, int, int, DBTYPE, const void *);
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#endif
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#ifdef __DBINTERFACE_PRIVATE
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DB *__bt_open(const char *, int, int, const BTREEINFO *, int);
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DB *__hash_open(const char *, int, int, const HASHINFO *, int);
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DB *__rec_open(const char *, int, int, const RECNOINFO *, int);
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void __dbpanic(DB *dbp);
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#endif
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__END_DECLS
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#endif /* !_DB_H_ */
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