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/*--------------------------------------------------------------------
* Symbols referenced in this file:
* - ArrayGetNItems
* - ArrayGetNItemsSafe
* - ArrayCheckBounds
* - ArrayCheckBoundsSafe
*--------------------------------------------------------------------
*/
/*-------------------------------------------------------------------------
*
* arrayutils.c
* This file contains some support routines required for array functions.
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/adt/arrayutils.c
*
*-------------------------------------------------------------------------
*/
/*
* Convert subscript list into linear element number (from 0)
*
* We assume caller has already range-checked the dimensions and subscripts,
* so no overflow is possible.
*/
/*
* Convert array dimensions into number of elements
*
* This must do overflow checking, since it is used to validate that a user
* dimensionality request doesn't overflow what we can handle.
*
* The multiplication overflow check only works on machines that have int64
* arithmetic, but that is nearly all platforms these days, and doing check
* divides for those that don't seems way too expensive.
*/
int
/*
* This entry point can return the error into an ErrorSaveContext
* instead of throwing an exception. -1 is returned after an error.
*/
int
/*
* Verify sanity of proposed lower-bound values for an array
*
* The lower-bound values must not be so large as to cause overflow when
* calculating subscripts, e.g. lower bound 2147483640 with length 10
* must be disallowed. We actually insist that dims[i] + lb[i] be
* computable without overflow, meaning that an array with last subscript
* equal to INT_MAX will be disallowed.
*
* It is assumed that the caller already called ArrayGetNItems, so that
* overflowed (negative) dims[] values have been eliminated.
*/
void
/*
* This entry point can return the error into an ErrorSaveContext
* instead of throwing an exception.
*/
bool
/*
* Compute ranges (sub-array dimensions) for an array slice
*
* We assume caller has validated slice endpoints, so overflow is impossible
*/
/*
* Compute products of array dimensions, ie, scale factors for subscripts
*
* We assume caller has validated dimensions, so overflow is impossible
*/
/*
* From products of whole-array dimensions and spans of a sub-array,
* compute offset distances needed to step through subarray within array
*
* We assume caller has validated dimensions, so overflow is impossible
*/
/*
* Generates the tuple that is lexicographically one greater than the current
* n-tuple in "curr", with the restriction that the i-th element of "curr" is
* less than the i-th element of "span".
*
* Returns -1 if no next tuple exists, else the subscript position (0..n-1)
* corresponding to the dimension to advance along.
*
* We assume caller has validated dimensions, so overflow is impossible
*/
/*
* ArrayGetIntegerTypmods: verify that argument is a 1-D cstring array,
* and get the contents converted to integers. Returns a palloc'd array
* and places the length at *n.
*/