215 lines
7.4 KiB
C
215 lines
7.4 KiB
C
/*-
|
|
* 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. 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
|
|
* $FreeBSD: src/include/db.h,v 1.5 2002/03/26 01:35:05 bde Exp $
|
|
*/
|
|
|
|
#ifndef _DB_H_
|
|
#define _DB_H_
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/cdefs.h>
|
|
#include <sys/config.h>
|
|
|
|
#include <limits.h>
|
|
|
|
#define RET_ERROR -1 /* Return values. */
|
|
#define RET_SUCCESS 0
|
|
#define RET_SPECIAL 1
|
|
|
|
#define MAX_PAGE_NUMBER 0xffffffff /* >= # of pages in a file */
|
|
typedef __uint32_t pgno_t;
|
|
#define MAX_PAGE_OFFSET 65535 /* >= # of bytes in a page */
|
|
typedef __uint16_t indx_t;
|
|
#define MAX_REC_NUMBER 0xffffffff /* >= # of records in a tree */
|
|
typedef __uint32_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)(struct __db *);
|
|
int (*del)(const struct __db *, const DBT *, u_int);
|
|
int (*get)(const struct __db *, const DBT *, DBT *, u_int);
|
|
int (*put)(const struct __db *, DBT *, const DBT *, u_int);
|
|
int (*seq)(const struct __db *, DBT *, DBT *, u_int);
|
|
int (*sync)(const struct __db *, u_int);
|
|
void *internal; /* Access method private. */
|
|
int (*fd)(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 */
|
|
(const DBT *, const DBT *);
|
|
size_t (*prefix) /* prefix function */
|
|
(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 */
|
|
__uint32_t /* hash function */
|
|
(*hash)(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;
|
|
|
|
/*
|
|
* 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) { \
|
|
__uint32_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) { \
|
|
__uint32_t _tmp = *(__uint32_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) { \
|
|
__uint16_t _tmp = a; \
|
|
((char *)&a)[0] = ((char *)&_tmp)[1]; \
|
|
((char *)&a)[1] = ((char *)&_tmp)[0]; \
|
|
}
|
|
#define P_16_SWAP(a) { \
|
|
__uint16_t _tmp = *(__uint16_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]; \
|
|
}
|
|
|
|
__BEGIN_DECLS
|
|
DB *dbopen(const char *, int, int, DBTYPE, const void *);
|
|
|
|
#ifdef __DBINTERFACE_PRIVATE
|
|
DB *__bt_open(const char *, int, int, const BTREEINFO *, int);
|
|
DB *__hash_open(const char *, int, int, int, const HASHINFO *);
|
|
DB *__rec_open(const char *, int, int, const RECNOINFO *, int);
|
|
void __dbpanic(DB *dbp);
|
|
#endif
|
|
__END_DECLS
|
|
#endif /* !_DB_H_ */
|