Re: Importing C structs?

[Freejack <freejack@nospam.net>]

On Thu, 31 Jul 2003 01:35:57 -0400, Matthew Heaney wrote:

> The type DBTYPE is a bit of a mystery at this point, since structs
> aren't typically passed by value in C.  Perhaps DBTYPE is really a
> pointer?

The header file declares it thusly....

/*******************************************************
 * Access methods.
 *******************************************************/
/*
 * !!!
 * Changes here must be reflected in java/src/com/sleepycat/db/Db.java.
 */
	typedef enum {
	DB_BTREE=1,
	DB_HASH,
	DB_RECNO,
	DB_QUEUE,
	DB_UNKNOWN			/* Figure it out on open. */
	} DBTYPE;
 
So I'm assuming I could just use an Ada enumerated type. (It compiles when I
do this, but it fails at runtime.)

The second hurdle I'll need to jump is creating a suitable Ada
replacement for this buttload of defines that occur after the DBTYPE
declaration.

/*
 * DB access method and cursor operation values.  Each value is an operation
 * code to which additional bit flags are added.
 */
#define	DB_AFTER	 1		/* c_put() */
#define	DB_APPEND	 2		/* put() */
#define	DB_BEFORE	 3		/* c_put() */
#define	DB_CACHED_COUNTS 4		/* stat() */
#define	DB_CHECKPOINT	 5		/* log_put(), log_get() */
#define	DB_CONSUME	 6		/* get() */
#define	DB_CONSUME_WAIT  7		/* get() */
#define	DB_CURLSN	 8		/* log_put() */
#define	DB_CURRENT	 9		/* c_get(), c_put(), log_get() */
#define	DB_FIRST	10		/* c_get(), log_get() */
#define	DB_FLUSH	11		/* log_put() */
#define	DB_GET_BOTH	12		/* get(), c_get() */
#define	DB_GET_BOTHC	13		/* c_get() (internal) */
#define	DB_GET_RECNO	14		/* c_get() */
#define	DB_JOIN_ITEM	15		/* c_get(); do not do primary lookup */
#define	DB_KEYFIRST	16		/* c_put() */
#define	DB_KEYLAST	17		/* c_put() */
#define	DB_LAST		18		/* c_get(), log_get() */
#define	DB_NEXT		19		/* c_get(), log_get() */
#define	DB_NEXT_DUP	20		/* c_get() */
#define	DB_NEXT_NODUP	21		/* c_get() */
#define	DB_NODUPDATA	22		/* put(), c_put() */
#define	DB_NOOVERWRITE	23		/* put() */
#define	DB_NOSYNC	24		/* close() */
#define	DB_POSITION	25		/* c_dup() */
#define	DB_POSITIONI	26		/* c_dup() (internal) */
#define	DB_PREV		27		/* c_get(), log_get() */
#define	DB_PREV_NODUP	28		/* c_get(), log_get() */
#define	DB_RECORDCOUNT	29		/* stat() */
#define	DB_SET		30		/* c_get(), log_get() */
#define	DB_SET_RANGE	31		/* c_get() */
#define	DB_SET_RECNO	32		/* get(), c_get() */
#define	DB_WRITECURSOR	33		/* cursor() */
#define	DB_WRITELOCK	34		/* cursor() (internal) */

But one step at a time.

Hooking into glibc is cake, but this is something else entirely. Heh.

Any suggestions?

Freejack