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* @license Apache-2.0
*
* Copyright (c) 2026 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 floorf = require( '@stdlib/math/base/special/floorf' );
var ceilf = require( '@stdlib/math/base/special/ceilf' );
var log10 = require( '@stdlib/math/base/special/log10' );
var MAX_EXP = require( '@stdlib/constants/float32/max-base10-exponent' );
var MIN_EXP_SUBNORMAL = require( '@stdlib/constants/float32/min-base10-exponent-subnormal' );
var NINF = require( '@stdlib/constants/float32/ninf' );
var f32 = require( '@stdlib/number/float64/base/to-float32' );
// VARIABLES //
var ZERO = f32( 0.0 );
var ONE = f32( 1.0 );
// MAIN //
/**
* Rounds a single-precision floating-point number to the nearest power of `10` toward negative infinity.
*
* @param {number} x - input value
* @returns {number} rounded value
*
* @example
* var v = floor10f( 3.141592653589793 );
* // returns 1.0
*
* @example
* var v = floor10f( 9.0 );
* // returns 1.0
*
* @example
* var v = floor10f( -0.314 );
* // returns -1.0
*/
function floor10f( x ) {
var sign;
var p;
if (
isnanf( x ) ||
isInfinitef( x ) ||
x === ZERO
) {
return x;
}
if ( x < ZERO ) {
x = -x;
sign = -ONE;
} else {
sign = ONE;
}
// Solve the equation `10^p = x` for `p`:
p = f32( log10( x ) );
// Determine a power of 10 which rounds the input value toward negative infinity:
if ( sign === ONE ) {
p = floorf( p );
} else {
p = ceilf( p );
}
// Handle underflow:
if ( p <= MIN_EXP_SUBNORMAL ) {
return f32( sign * ZERO ); // sign-preserving
}
// Handle overflow:
if ( p > MAX_EXP ) {
return NINF;
}
return f32( sign * powf( 10.0, p ) );
}
// EXPORTS //
module.exports = floor10f;
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