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/*-------------------------------------------------------------------------
*
* tupmacs.h
* Tuple macros used by both index tuples and heap tuples.
*
*
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/tupmacs.h,v 1.26 2004/08/29 04:13:04 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TUPMACS_H
#define TUPMACS_H
#include "utils/memutils.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 Form_pg_attribute and a pointer into a tuple's data area,
* return the correct value or pointer.
*
* We return a Datum value in all cases. If the attribute has "byval" false,
* we return the same pointer into the tuple data area that we're passed.
* Otherwise, we return the correct number of bytes fetched from the data
* area and extended to Datum form.
*
* On machines where Datum is 8 bytes, we support fetching 8-byte byval
* attributes; otherwise, only 1, 2, and 4-byte values are supported.
*
* Note that T must already be properly aligned for this to work correctly.
*/
#define fetchatt(A,T) fetch_att(T, (A)->attbyval, (A)->attlen)
/*
* Same, but work from byval/len parameters rather than Form_pg_attribute.
*/
#if SIZEOF_DATUM == 8
#define fetch_att(T,attbyval,attlen) \
( \
(attbyval) ? \
( \
(attlen) == (int) sizeof(Datum) ? \
*((Datum *)(T)) \
: \
( \
(attlen) == (int) sizeof(int32) ? \
Int32GetDatum(*((int32 *)(T))) \
: \
( \
(attlen) == (int) sizeof(int16) ? \
Int16GetDatum(*((int16 *)(T))) \
: \
( \
AssertMacro((attlen) == 1), \
CharGetDatum(*((char *)(T))) \
) \
) \
) \
) \
: \
PointerGetDatum((char *) (T)) \
)
#else /* SIZEOF_DATUM != 8 */
#define fetch_att(T,attbyval,attlen) \
( \
(attbyval) ? \
( \
(attlen) == (int) sizeof(int32) ? \
Int32GetDatum(*((int32 *)(T))) \
: \
( \
(attlen) == (int) sizeof(int16) ? \
Int16GetDatum(*((int16 *)(T))) \
: \
( \
AssertMacro((attlen) == 1), \
CharGetDatum(*((char *)(T))) \
) \
) \
) \
: \
PointerGetDatum((char *) (T)) \
)
#endif /* SIZEOF_DATUM == 8 */
/*
* att_align aligns the given offset as needed for a datum of alignment
* requirement attalign. The cases are tested in what is hopefully something
* like their frequency of occurrence.
*/
#define att_align(cur_offset, attalign) \
( \
((attalign) == 'i') ? INTALIGN(cur_offset) : \
(((attalign) == 'c') ? ((long)(cur_offset)) : \
(((attalign) == 'd') ? DOUBLEALIGN(cur_offset) : \
( \
AssertMacro((attalign) == 's'), \
SHORTALIGN(cur_offset) \
))) \
)
/*
* att_addlength increments the given offset by the length of the attribute.
* attval is only accessed if we are dealing with a variable-length attribute.
*/
#define att_addlength(cur_offset, attlen, attval) \
( \
((attlen) > 0) ? \
( \
(cur_offset) + (attlen) \
) \
: (((attlen) == -1) ? \
( \
(cur_offset) + VARATT_SIZE(DatumGetPointer(attval)) \
) \
: \
( \
AssertMacro((attlen) == -2), \
(cur_offset) + (strlen(DatumGetCString(attval)) + 1) \
)) \
)
/*
* store_att_byval is a partial inverse of fetch_att: store a given Datum
* value into a tuple data area at the specified address. However, it only
* handles the byval case, because in typical usage the caller needs to
* distinguish by-val and by-ref cases anyway, and so a do-it-all macro
* wouldn't be convenient.
*/
#if SIZEOF_DATUM == 8
#define store_att_byval(T,newdatum,attlen) \
do { \
switch (attlen) \
{ \
case sizeof(char): \
*(char *) (T) = DatumGetChar(newdatum); \
break; \
case sizeof(int16): \
*(int16 *) (T) = DatumGetInt16(newdatum); \
break; \
case sizeof(int32): \
*(int32 *) (T) = DatumGetInt32(newdatum); \
break; \
case sizeof(Datum): \
*(Datum *) (T) = (newdatum); \
break; \
default: \
elog(ERROR, "unsupported byval length: %d", \
(int) (attlen)); \
break; \
} \
} while (0)
#else /* SIZEOF_DATUM != 8 */
#define store_att_byval(T,newdatum,attlen) \
do { \
switch (attlen) \
{ \
case sizeof(char): \
*(char *) (T) = DatumGetChar(newdatum); \
break; \
case sizeof(int16): \
*(int16 *) (T) = DatumGetInt16(newdatum); \
break; \
case sizeof(int32): \
*(int32 *) (T) = DatumGetInt32(newdatum); \
break; \
default: \
elog(ERROR, "unsupported byval length: %d", \
(int) (attlen)); \
break; \
} \
} while (0)
#endif /* SIZEOF_DATUM == 8 */
#endif
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