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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 isnanf = require( '@stdlib/math/base/assert/is-nanf' );
var isInfinitef = require( '@stdlib/math/base/assert/is-infinitef' );
var powf = require( '@stdlib/math/base/special/powf' );
var truncf = require( '@stdlib/math/base/special/truncf' );
var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
// MAIN //
/**
* Rounds a single-precision floating-point number toward zero to `n` digits in base `b`.
*
* @param {number} x - input value
* @param {integer} n - number of digits
* @param {integer} b - base
* @returns {number} rounded value
*
* @example
* var v = truncbf( 3.14159, 2, 10 );
* // returns 3.140000104904175
*
* @example
* var v = truncbf( 3.14159, 3, 10 );
* // returns 3.1410000324249268
*
* @example
* var v = truncbf( 15.0, -1, 10 );
* // returns 10.0
*
* @example
* var v = truncbf( -3.14159, 2, 10 );
* // returns -3.140000104904175
*
* @example
* var v = truncbf( NaN, 2, 10 );
* // returns NaN
*/
function truncbf( x, n, b ) {
var s;
var y;
x = float64ToFloat32( x );
if ( x === 0.0 || isnanf( x ) || isInfinitef( x ) ) {
return x;
}
if ( b === 0 ) {
return NaN;
}
// Compute scale factor in single precision: s = b^n
s = powf( float64ToFloat32( b ), float64ToFloat32( n ) );
// Handle overflow in scale factor
if ( isInfinitef( s ) ) {
return x;
}
// Multiply by scale, truncate, then divide by scale
y = truncf( x * s ) / s;
return float64ToFloat32( y );
}
// EXPORTS //
module.exports = truncbf;
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