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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869// SPDX-License-Identifier: Apache-2.0 OR MIT
use std::ops::{AddAssign, MulAssign};
// For implementing base10_digits() accessor on LitInt.pub(crate) struct BigInt { digits: Vec<u8>,}
impl BigInt { pub(crate) fn new() -> Self { BigInt { digits: Vec::new() } }
pub(crate) fn to_string(&self) -> String { let mut repr = String::with_capacity(self.digits.len());
let mut has_nonzero = false; for digit in self.digits.iter().rev() { has_nonzero |= *digit != 0; if has_nonzero { repr.push((*digit + b'0') as char); } }
if repr.is_empty() { repr.push('0'); }
repr }
fn reserve_two_digits(&mut self) { let len = self.digits.len(); let desired = len + !self.digits.ends_with(&[0, 0]) as usize + !self.digits.ends_with(&[0]) as usize; self.digits.resize(desired, 0); }}
impl AddAssign<u8> for BigInt { // Assumes increment <16. fn add_assign(&mut self, mut increment: u8) { self.reserve_two_digits();
let mut i = 0; while increment > 0 { let sum = self.digits[i] + increment; self.digits[i] = sum % 10; increment = sum / 10; i += 1; } }}
impl MulAssign<u8> for BigInt { // Assumes base <=16. fn mul_assign(&mut self, base: u8) { self.reserve_two_digits();
let mut carry = 0; for digit in &mut self.digits { let prod = *digit * base + carry; *digit = prod % 10; carry = prod / 10; } }}