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Diffstat (limited to 'include/db.h')
| -rw-r--r-- | include/db.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/include/db.h b/include/db.h new file mode 100644 index 0000000..4381efe --- /dev/null +++ b/include/db.h @@ -0,0 +1,161 @@ +/* $OpenBSD: db.h,v 1.12 2015/10/17 21:48:42 guenther Exp $ */ +/* $NetBSD: db.h,v 1.13 1994/10/26 00:55:48 cgd Exp $ */ + +/*- + * 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 + */ + +#ifndef _DB_H_ +#define _DB_H_ + +#include <sys/types.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)(struct __db *); + int (*del)(const struct __db *, const DBT *, unsigned int); + int (*get)(const struct __db *, const DBT *, DBT *, unsigned int); + int (*put)(const struct __db *, DBT *, const DBT *, unsigned int); + int (*seq)(const struct __db *, DBT *, DBT *, unsigned int); + int (*sync)(const struct __db *, unsigned 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 */ + unsigned long flags; + unsigned int cachesize; /* bytes to cache */ + int maxkeypage; /* maximum keys per page */ + int minkeypage; /* minimum keys per page */ + unsigned 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 { + unsigned int bsize; /* bucket size */ + unsigned int ffactor; /* fill factor */ + unsigned int nelem; /* number of elements */ + unsigned int cachesize; /* bytes to cache */ + u_int32_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 */ + unsigned long flags; + unsigned int cachesize; /* bytes to cache */ + unsigned int psize; /* page size */ + int lorder; /* byte order */ + size_t reclen; /* record length + (fixed-length records) */ + unsigned char bval; /* delimiting byte + (variable-length records) */ + char *bfname; /* btree file name */ +} RECNOINFO; + +__BEGIN_DECLS +DB *dbopen(const char *, int, int, DBTYPE, const void *); +__END_DECLS +#endif /* !_DB_H_ */ |