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* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var min = require( '@stdlib/math/base/special/min' );
var abs = require( '@stdlib/math/base/special/abs' );
var Float64Array = require( '@stdlib/array/float64' );
// MAIN //
/**
* Performs an in-place copy of elements within a double-precision floating-point array.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {integer} target - target index
* @param {Float64Array} x - input array
* @param {integer} strideX - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @param {integer} start - source start index
* @param {integer} end - source end index
* @returns {Float64Array} input array
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
*
* dcopyWithin( 2, 2, x, 1, 0, 1, 3 );
* // x => <Float64Array>[ 1.0, 2.0, 2.0, 3.0, 5.0, 6.0 ]
*/
function dcopyWithin( N, target, x, strideX, offsetX, start, end ) {
var targetIdx;
var tmp;
var cl;
var o;
var i;
if ( N <= 0 ) {
return x;
}
// Resolve copy length:
cl = min( abs( end - start ), N );
// Create a temporary copy of source elements:
tmp = new Float64Array( cl );
if ( strideX > 0 ) {
o = offsetX + ( start * strideX );
} else {
o = start;
}
// Copy source elements to temporary array:
for ( i = 0; i < cl; i++ ) {
tmp[ i ] = x[ o ];
o += strideX;
}
// Resolve the target index:
if ( strideX > 0 ) {
targetIdx = offsetX + ( target * strideX );
} else {
targetIdx = target;
}
// Allocate elements to target position:
for ( i = 0; i < cl; i++ ) {
x[ targetIdx ] = tmp[ i ];
targetIdx += strideX;
}
return x;
}
// EXPORTS //
module.exports = dcopyWithin;
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