mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-02 02:13:23 +02:00
94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* varbit.h
|
|
* Functions for the SQL datatypes BIT() and BIT VARYING().
|
|
*
|
|
* Code originally contributed by Adriaan Joubert.
|
|
*
|
|
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* $Id: varbit.h,v 1.13 2001/10/28 06:26:10 momjian Exp $
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef VARBIT_H
|
|
#define VARBIT_H
|
|
|
|
#include "fmgr.h"
|
|
|
|
/*
|
|
* Modeled on struct varlena from postgres.h, but data type is bits8.
|
|
*/
|
|
typedef struct
|
|
{
|
|
int32 vl_len; /* standard varlena header (total size in
|
|
* bytes) */
|
|
int32 bit_len; /* number of valid bits */
|
|
bits8 bit_dat[1]; /* bit string, most sig. byte first */
|
|
} VarBit;
|
|
|
|
/*
|
|
* fmgr interface macros
|
|
*
|
|
* BIT and BIT VARYING are toastable varlena types. They are the same
|
|
* as far as representation goes, so we just have one set of macros.
|
|
*/
|
|
#define DatumGetVarBitP(X) ((VarBit *) PG_DETOAST_DATUM(X))
|
|
#define DatumGetVarBitPCopy(X) ((VarBit *) PG_DETOAST_DATUM_COPY(X))
|
|
#define VarBitPGetDatum(X) PointerGetDatum(X)
|
|
#define PG_GETARG_VARBIT_P(n) DatumGetVarBitP(PG_GETARG_DATUM(n))
|
|
#define PG_GETARG_VARBIT_P_COPY(n) DatumGetVarBitPCopy(PG_GETARG_DATUM(n))
|
|
#define PG_RETURN_VARBIT_P(x) return VarBitPGetDatum(x)
|
|
|
|
/* Header overhead *in addition to* VARHDRSZ */
|
|
#define VARBITHDRSZ sizeof(int32)
|
|
/* Number of bits in this bit string */
|
|
#define VARBITLEN(PTR) (((VarBit *) (PTR))->bit_len)
|
|
/* Pointer to the first byte containing bit string data */
|
|
#define VARBITS(PTR) (((VarBit *) (PTR))->bit_dat)
|
|
/* Number of bytes in the data section of a bit string */
|
|
#define VARBITBYTES(PTR) (VARSIZE(PTR) - VARHDRSZ - VARBITHDRSZ)
|
|
/* Padding of the bit string at the end (in bits) */
|
|
#define VARBITPAD(PTR) (VARBITBYTES(PTR)*BITS_PER_BYTE - VARBITLEN(PTR))
|
|
/* Number of bytes needed to store a bit string of a given length */
|
|
#define VARBITTOTALLEN(BITLEN) (((BITLEN) + BITS_PER_BYTE-1)/BITS_PER_BYTE + \
|
|
VARHDRSZ + VARBITHDRSZ)
|
|
/* pointer beyond the end of the bit string (like end() in STL containers) */
|
|
#define VARBITEND(PTR) (((bits8 *) (PTR)) + VARSIZE(PTR))
|
|
/* Mask that will cover exactly one byte, i.e. BITS_PER_BYTE bits */
|
|
#define BITMASK 0xFF
|
|
#define BITHIGH 0x80
|
|
|
|
|
|
extern Datum bit_in(PG_FUNCTION_ARGS);
|
|
extern Datum bit_out(PG_FUNCTION_ARGS);
|
|
extern Datum varbit_in(PG_FUNCTION_ARGS);
|
|
extern Datum varbit_out(PG_FUNCTION_ARGS);
|
|
extern Datum bit(PG_FUNCTION_ARGS);
|
|
extern Datum _bit(PG_FUNCTION_ARGS);
|
|
extern Datum varbit(PG_FUNCTION_ARGS);
|
|
extern Datum _varbit(PG_FUNCTION_ARGS);
|
|
extern Datum biteq(PG_FUNCTION_ARGS);
|
|
extern Datum bitne(PG_FUNCTION_ARGS);
|
|
extern Datum bitlt(PG_FUNCTION_ARGS);
|
|
extern Datum bitle(PG_FUNCTION_ARGS);
|
|
extern Datum bitgt(PG_FUNCTION_ARGS);
|
|
extern Datum bitge(PG_FUNCTION_ARGS);
|
|
extern Datum bitcmp(PG_FUNCTION_ARGS);
|
|
extern Datum bitand(PG_FUNCTION_ARGS);
|
|
extern Datum bitor(PG_FUNCTION_ARGS);
|
|
extern Datum bitxor(PG_FUNCTION_ARGS);
|
|
extern Datum bitnot(PG_FUNCTION_ARGS);
|
|
extern Datum bitshiftleft(PG_FUNCTION_ARGS);
|
|
extern Datum bitshiftright(PG_FUNCTION_ARGS);
|
|
extern Datum bitcat(PG_FUNCTION_ARGS);
|
|
extern Datum bitsubstr(PG_FUNCTION_ARGS);
|
|
extern Datum bitlength(PG_FUNCTION_ARGS);
|
|
extern Datum bitoctetlength(PG_FUNCTION_ARGS);
|
|
extern Datum bitfromint4(PG_FUNCTION_ARGS);
|
|
extern Datum bittoint4(PG_FUNCTION_ARGS);
|
|
extern Datum bitposition(PG_FUNCTION_ARGS);
|
|
|
|
#endif
|