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64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* attnum.h
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* POSTGRES attribute number definitions.
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*
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/access/attnum.h,v 1.21 2005/05/25 21:40:42 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef ATTNUM_H
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#define ATTNUM_H
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/*
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* user defined attribute numbers start at 1. -ay 2/95
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*/
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typedef int16 AttrNumber;
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#define InvalidAttrNumber 0
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/* ----------------
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* support macros
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* ----------------
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*/
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/*
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* AttributeNumberIsValid
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* True iff the attribute number is valid.
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*/
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#define AttributeNumberIsValid(attributeNumber) \
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((bool) ((attributeNumber) != InvalidAttrNumber))
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/*
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* AttrNumberIsForUserDefinedAttr
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* True iff the attribute number corresponds to an user defined attribute.
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*/
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#define AttrNumberIsForUserDefinedAttr(attributeNumber) \
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((bool) ((attributeNumber) > 0))
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/*
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* AttrNumberGetAttrOffset
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* Returns the attribute offset for an attribute number.
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*
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* Note:
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* Assumes the attribute number is for an user defined attribute.
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*/
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#define AttrNumberGetAttrOffset(attNum) \
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( \
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AssertMacro(AttrNumberIsForUserDefinedAttr(attNum)), \
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((attNum) - 1) \
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)
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/*
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* AttributeOffsetGetAttributeNumber
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* Returns the attribute number for an attribute offset.
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*/
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#define AttrOffsetGetAttrNumber(attributeOffset) \
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((AttrNumber) (1 + (attributeOffset)))
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#endif /* ATTNUM_H */
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