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Re: berkeley db header files

From: Ben Collins-Sussman <sussman_at_newton.collab.net>
Date: 2000-09-25 01:12:41 CEST

Jim Blandy <jimb@savonarola.red-bean.com> writes:

> Out of curiosity, what *is* /usr/include/db.h on your system?

I'm not sure. I suspect it's an earlier version of berkeley db?
Maybe not. I don't know enough about FreeBSD.

I've attached it here:

----------------------

/*-
 * 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. 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.
 *
 * @(#)db.h 8.7 (Berkeley) 6/16/94
 */

#ifndef _DB_H_
#define _DB_H_

#include <sys/types.h>
#include <sys/cdefs.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 u_int32_t pgno_t;
#define MAX_PAGE_OFFSET 65535 /* >= # of bytes in a page */
typedef u_int16_t indx_t;
#define MAX_REC_NUMBER 0xffffffff /* >= # of records in a tree */
typedef u_int32_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) __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));
        int (*sync) __P((const struct __db *, u_int));
        void *internal; /* Access method private. */
        int (*fd) __P((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 */
            __P((const DBT *, const DBT *));
        size_t (*prefix) /* prefix function */
            __P((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 */
        u_int32_t /* hash function */
                (*hash) __P((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;

#ifdef __DBINTERFACE_PRIVATE
/*
 * 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) { \
        u_int32_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) { \
        u_int32_t _tmp = *(u_int32_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) { \
        u_int16_t _tmp = a; \
        ((char *)&a)[0] = ((char *)&_tmp)[1]; \
        ((char *)&a)[1] = ((char *)&_tmp)[0]; \
}
#define P_16_SWAP(a) { \
        u_int16_t _tmp = *(u_int16_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]; \
}
#endif

__BEGIN_DECLS
DB *dbopen __P((const char *, int, int, DBTYPE, const void *));

#ifdef __DBINTERFACE_PRIVATE
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));
void __dbpanic __P((DB *dbp));
#endif
__END_DECLS
#endif /* !_DB_H_ */
Received on Sat Oct 21 14:36:08 2006

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