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/*-------------------------------------------------------------------------
*
* tupmacs.h--
* Tuple macros used by both index tuples and heap tuples.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: tupmacs.h,v 1.1.1.1 1996/07/09 06:21:09 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TUPMACS_H
#define TUPMACS_H
/*
* check to see if the ATT'th bit of an array of 8-bit bytes is set.
*/
#define att_isnull(ATT, BITS) (!((BITS)[(ATT) >> 3] & (1 << ((ATT) & 0x07))))
/*
* given a AttributeTupleForm and a pointer into a tuple's data
* area, return the correct value or pointer.
*
* note that T must already be properly LONGALIGN/SHORTALIGN'd for
* this to work correctly.
*
* the double-cast is to stop gcc from (correctly) complaining about
* casting integer types with size < sizeof(char *) to (char *).
* sign-extension may get weird if you use an integer type that
* isn't the same size as (char *) for the first cast. (on the other
* hand, it's safe to use another type for the (foo *)(T).)
*/
#define fetchatt(A, T) \
((*(A))->attbyval \
? ((*(A))->attlen > sizeof(int16) \
? (char *) (long) *((int32 *)(T)) \
: ((*(A))->attlen < sizeof(int16) \
? (char *) (long) *((char *)(T)) \
: (char *) (long) *((int16 *)(T)))) \
: (char *) (T))
#endif
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