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/*------------------------------------------------------------------------- * * arrayaccess.h * Declarations for element-by-element access to Postgres arrays. * * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/utils/arrayaccess.h * *------------------------------------------------------------------------- */ #ifndef ARRAYACCESS_H #define ARRAYACCESS_H #include "access/tupmacs.h" #include "utils/array.h" /* * Functions for iterating through elements of a flat or expanded array. * These require a state struct "array_iter iter". * * Use "array_iter_setup(&iter, arrayptr);" to prepare to iterate, and * "datumvar = array_iter_next(&iter, &isnullvar, index, ...);" to fetch * the next element into datumvar/isnullvar. * "index" must be the zero-origin element number; we make caller provide * this since caller is generally counting the elements anyway. Despite * that, these functions can only fetch elements sequentially. */ typedef struct array_iter { /* datumptr being NULL or not tells if we have flat or expanded array */ /* Fields used when we have an expanded array */ Datum *datumptr; /* Pointer to Datum array */ bool *isnullptr; /* Pointer to isnull array */ /* Fields used when we have a flat array */ char *dataptr; /* Current spot in the data area */ bits8 *bitmapptr; /* Current byte of the nulls bitmap, or NULL */ int bitmask; /* mask for current bit in nulls bitmap */ } array_iter; static inline void array_iter_setup(array_iter *it, AnyArrayType *a) { if (VARATT_IS_EXPANDED_HEADER(a)) { if (a->xpn.dvalues) { it->datumptr = a->xpn.dvalues; it->isnullptr = a->xpn.dnulls; /* we must fill all fields to prevent compiler warnings */ it->dataptr = NULL; it->bitmapptr = NULL; } else { /* Work with flat array embedded in the expanded datum */ it->datumptr = NULL; it->isnullptr = NULL; it->dataptr = ARR_DATA_PTR(a->xpn.fvalue); it->bitmapptr = ARR_NULLBITMAP(a->xpn.fvalue); } } else { it->datumptr = NULL; it->isnullptr = NULL; it->dataptr = ARR_DATA_PTR((ArrayType *) a); it->bitmapptr = ARR_NULLBITMAP((ArrayType *) a); } it->bitmask = 1; } static inline Datum array_iter_next(array_iter *it, bool *isnull, int i, int elmlen, bool elmbyval, char elmalign) { Datum ret; if (it->datumptr) { ret = it->datumptr[i]; *isnull = it->isnullptr ? it->isnullptr[i] : false; } else { if (it->bitmapptr && (*(it->bitmapptr) & it->bitmask) == 0) { *isnull = true; ret = (Datum) 0; } else { *isnull = false; ret = fetch_att(it->dataptr, elmbyval, elmlen); it->dataptr = att_addlength_pointer(it->dataptr, elmlen, it->dataptr); it->dataptr = (char *) att_align_nominal(it->dataptr, elmalign); } it->bitmask <<= 1; if (it->bitmask == 0x100) { if (it->bitmapptr) it->bitmapptr++; it->bitmask = 1; } } return ret; } #endif /* ARRAYACCESS_H */