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/*-------------------------------------------------------------------------
*
* attnum.h--
* POSTGRES attribute number definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: attnum.h,v 1.1.1.1 1996/07/09 06:21:08 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef ATTNUM_H
#define ATTNUM_H
#include "c.h"
/*
* user defined attribute numbers start at 1. -ay 2/95
*/
typedef int16 AttrNumber;
#define InvalidAttrNumber 0
/* ----------------
* support macros
* ----------------
*/
/*
* AttributeNumberIsValid --
* True iff the attribute number is valid.
*/
#define AttributeNumberIsValid(attributeNumber) \
((bool) ((attributeNumber) != InvalidAttrNumber))
/*
* AttrNumberIsForUserDefinedAttr --
* True iff the attribute number corresponds to an user defined attribute.
*/
#define AttrNumberIsForUserDefinedAttr(attributeNumber) \
((bool) ((attributeNumber) > 0))
/*
* AttrNumberGetAttrOffset --
* Returns the attribute offset for an attribute number.
*
* Note:
* Assumes the attribute number is for an user defined attribute.
*/
#define AttrNumberGetAttrOffset(attNum) \
(AssertMacro(AttrNumberIsForUserDefinedAttr(attNum)) ? \
((attNum - 1)) : 0)
/*
* AttributeOffsetGetAttributeNumber --
* Returns the attribute number for an attribute offset.
*/
#define AttrOffsetGetAttrNumber(attributeOffset) \
((AttrNumber) (1 + attributeOffset))
#endif /* ATTNUM_H */
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