@struktoai/mirage-core/dist/commands/builtin/utils/strtol.js

A Unified Virtual Filesystem For AI Agents

// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
// 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.
// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
import { C_SPACE } from "../constants.js";
// The leading decimal run C's atoi reads, after blanks and one sign.
const DECIMAL = new RegExp(`^${C_SPACE}([+-]?)([0-9]+)`);
const LONG_MIN = -(2n ** 63n);
const LONG_MAX = 2n ** 63n - 1n;
export const INT_MAX = 2n ** 31n - 1n;
/**
 * ASCII decimal `digits` as a number, null when it is `bound` or more. Leading
 * zeros go first and a run longer than the bound is refused by its length, so
 * however many digits are typed, the conversion only ever sees as many as the
 * bound has. Mirrors Python's bounded_decimal.
 */
export function boundedDecimal(digits, bound) {
    const significant = digits.replace(/^0+/, '');
    if (significant.length > bound.toString().length)
        return null;
    const value = BigInt(significant === '' ? '0' : significant);
    return value < bound ? value : null;
}
/**
 * C's `atoi`: the decimal number `text` begins with, after C blanks and one
 * sign, 0 when it begins with none, saturated to the `long` range as glibc's
 * `strtol` underneath it is. Mirrors Python's `atoi`.
 */
export function atoi(text) {
    const match = DECIMAL.exec(text);
    if (match === null)
        return 0;
    const negative = match[1] === '-';
    const limit = negative ? -LONG_MIN : LONG_MAX;
    const value = boundedDecimal(match[2] ?? '0', limit + 1n) ?? limit;
    return Number(negative ? -value : value);
}
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