NetBSD/include/db.h

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/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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.
*
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* from: @(#)db.h 8.3 (Berkeley) 10/12/93
* $Id: db.h,v 1.11 1993/10/20 07:25:53 cgd Exp $
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*/
#ifndef _DB_H_
#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. */
#define RET_SUCCESS 0
#define RET_SPECIAL 1
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#define MAX_PAGE_NUMBER ULONG_MAX /* >= # of pages in a file */
typedef u_long pgno_t;
#define MAX_PAGE_OFFSET USHRT_MAX /* >= # of bytes in a page */
typedef u_short indx_t;
#define MAX_REC_NUMBER ULONG_MAX /* >= # of records in a tree */
typedef u_long 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 */
size_t size; /* data length */
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} DBT;
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/* Routine flags. */
#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 */
#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) */
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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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/*
* !!!
* 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 0x00002000 /* Do locking. */
#define DB_SHMEM 0x00004000 /* Use shared memory. */
#define DB_TXN 0x00008000 /* Do transactions. */
#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) __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));
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int (*sync) __P((const struct __db *, u_int));
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void *internal; /* Access method private. */
int (*fd) __P((const struct __db *));
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} DB;
#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 {
#define R_DUP 0x01 /* duplicate keys */
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u_long flags;
int cachesize; /* bytes to cache */
int maxkeypage; /* maximum keys per page */
int minkeypage; /* minimum keys per page */
int psize; /* page size */
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/* comparison, prefix functions */
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int (*compare) __P((const DBT *, const DBT *));
int (*prefix) __P((const DBT *, const DBT *));
int lorder; /* byte order */
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} BTREEINFO;
#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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int bsize; /* bucket size */
int ffactor; /* fill factor */
int nelem; /* number of elements */
int cachesize; /* bytes to cache */
/* hash function */
int (*hash) __P((const void *, size_t));
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 {
#define R_FIXEDLEN 0x01 /* fixed-length records */
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#define R_NOKEY 0x02 /* key not required */
#define R_SNAPSHOT 0x04 /* snapshot the input */
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u_long flags;
int cachesize; /* bytes to cache */
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 */
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} RECNOINFO;
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/*
* Little endian <==> big endian long swap macros.
* BLSWAP swap a memory location
* BLPSWAP swap a referenced memory location
* BLSWAP_COPY swap from one location to another
*/
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#define BLSWAP(a) { \
u_long _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]; \
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}
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#define BLPSWAP(a) { \
u_long _tmp = *(u_long *)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]; \
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}
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#define BLSWAP_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]; \
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}
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/*
* Little endian <==> big endian short swap macros.
* BSSWAP swap a memory location
* BSPSWAP swap a referenced memory location
* BSSWAP_COPY swap from one location to another
*/
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#define BSSWAP(a) { \
u_short _tmp = a; \
((char *)&a)[0] = ((char *)&_tmp)[1]; \
((char *)&a)[1] = ((char *)&_tmp)[0]; \
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}
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#define BSPSWAP(a) { \
u_short _tmp = *(u_short *)a; \
((char *)a)[0] = ((char *)&_tmp)[1]; \
((char *)a)[1] = ((char *)&_tmp)[0]; \
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}
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#define BSSWAP_COPY(a, b) { \
((char *)&(b))[0] = ((char *)&(a))[1]; \
((char *)&(b))[1] = ((char *)&(a))[0]; \
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}
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__BEGIN_DECLS
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DB *dbopen __P((const char *, int, int, DBTYPE, const void *));
#ifdef __DBINTERFACE_PRIVATE
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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));
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void __dbpanic __P((DB *dbp));
#endif
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__END_DECLS
#endif /* !_DB_H_ */