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/*-------------------------------------------------------------------------
*
* array.h
* Utilities for the new array code. Contains prototypes from the
* following files:
* utils/adt/arrayfuncs.c
* utils/adt/arrayutils.c
*
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: array.h,v 1.35 2002/09/18 21:35:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef ARRAY_H
#define ARRAY_H
#include "fmgr.h"
/*
* Arrays are varlena objects, so must meet the varlena convention that
* the first int32 of the object contains the total object size in bytes.
*/
typedef struct
{
int32 size; /* total array size (varlena requirement) */
int ndim; /* # of dimensions */
int flags; /* implementation flags */
/* flags field is currently unused, always zero. */
Oid elemtype; /* element type OID */
} ArrayType;
/*
* fmgr macros for array objects
*/
#define DatumGetArrayTypeP(X) ((ArrayType *) PG_DETOAST_DATUM(X))
#define DatumGetArrayTypePCopy(X) ((ArrayType *) PG_DETOAST_DATUM_COPY(X))
#define PG_GETARG_ARRAYTYPE_P(n) DatumGetArrayTypeP(PG_GETARG_DATUM(n))
#define PG_GETARG_ARRAYTYPE_P_COPY(n) DatumGetArrayTypePCopy(PG_GETARG_DATUM(n))
#define PG_RETURN_ARRAYTYPE_P(x) PG_RETURN_POINTER(x)
/*
* Access macros for array header fields.
*
* ARR_DIMS returns a pointer to an array of array dimensions (number of
* elements along the various array axes).
*
* ARR_LBOUND returns a pointer to an array of array lower bounds.
*
* That is: if the third axis of an array has elements 5 through 10, then
* ARR_DIMS(a)[2] == 6 and ARR_LBOUND[2] == 5.
*
* Unlike C, the default lower bound is 1.
*/
#define ARR_SIZE(a) (((ArrayType *) (a))->size)
#define ARR_NDIM(a) (((ArrayType *) (a))->ndim)
#define ARR_ELEMTYPE(a) (((ArrayType *) (a))->elemtype)
#define ARR_DIMS(a) \
((int *) (((char *) (a)) + sizeof(ArrayType)))
#define ARR_LBOUND(a) \
((int *) (((char *) (a)) + sizeof(ArrayType) + \
(sizeof(int) * ARR_NDIM(a))))
/*
* The total array header size for an array of dimension n (in bytes).
*/
#define ARR_OVERHEAD(n) \
(MAXALIGN(sizeof(ArrayType) + 2 * sizeof(int) * (n)))
/*
* Returns a pointer to the actual array data.
*/
#define ARR_DATA_PTR(a) \
(((char *) (a)) + ARR_OVERHEAD(ARR_NDIM(a)))
/*
* prototypes for functions defined in arrayfuncs.c
*/
extern Datum array_in(PG_FUNCTION_ARGS);
extern Datum array_out(PG_FUNCTION_ARGS);
extern Datum array_length_coerce(PG_FUNCTION_ARGS);
extern Datum array_eq(PG_FUNCTION_ARGS);
extern Datum array_dims(PG_FUNCTION_ARGS);
extern Datum array_ref(ArrayType *array, int nSubscripts, int *indx,
int arraylen, int elmlen, bool elmbyval, char elmalign,
bool *isNull);
extern ArrayType *array_set(ArrayType *array, int nSubscripts, int *indx,
Datum dataValue,
int arraylen, int elmlen, bool elmbyval, char elmalign,
bool *isNull);
extern ArrayType *array_get_slice(ArrayType *array, int nSubscripts,
int *upperIndx, int *lowerIndx,
int arraylen, int elmlen, bool elmbyval, char elmalign,
bool *isNull);
extern ArrayType *array_set_slice(ArrayType *array, int nSubscripts,
int *upperIndx, int *lowerIndx,
ArrayType *srcArray,
int arraylen, int elmlen, bool elmbyval, char elmalign,
bool *isNull);
extern Datum array_map(FunctionCallInfo fcinfo, Oid inpType, Oid retType);
extern ArrayType *construct_array(Datum *elems, int nelems,
Oid elmtype,
int elmlen, bool elmbyval, char elmalign);
extern void deconstruct_array(ArrayType *array,
Oid elmtype,
int elmlen, bool elmbyval, char elmalign,
Datum **elemsp, int *nelemsp);
/*
* prototypes for functions defined in arrayutils.c
*/
extern int ArrayGetOffset(int n, int *dim, int *lb, int *indx);
extern int ArrayGetOffset0(int n, int *tup, int *scale);
extern int ArrayGetNItems(int n, int *a);
extern void mda_get_range(int n, int *span, int *st, int *endp);
extern void mda_get_prod(int n, int *range, int *prod);
extern void mda_get_offset_values(int n, int *dist, int *prod, int *span);
extern int mda_next_tuple(int n, int *curr, int *span);
#endif /* ARRAY_H */
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