itoa fuzzer

fuzz_itoa.rs

#![no_main]
use libfuzzer_sys::fuzz_target;
use libfuzzer_sys::arbitrary;

#[derive(arbitrary::Arbitrary,Debug,Clone)]
enum IntegerInput {
    I8(i8),
    U8(u8),
    I16(i16),
    U16(u16),
    I32(i32),
    U32(u32),
    I64(i64),
    U64(u64),
    ISIZE(isize),
    USIZE(usize),
    I128(i128),
    U128(u128),
}

#[derive(arbitrary::Arbitrary,Debug,Clone)]
struct Inputs {
    inputs: Vec<IntegerInput>
}

fuzz_target!(|input: Inputs| {
    let mut buffer = itoa::Buffer::new();
    for input_integer in input.inputs {
        match input_integer {
            IntegerInput::I8(val) => buffer.format(val),
            IntegerInput::U8(val) => buffer.format(val),
            IntegerInput::I16(val) => buffer.format(val),
            IntegerInput::U16(val) => buffer.format(val),
            IntegerInput::I32(val) => buffer.format(val),
            IntegerInput::U32(val) => buffer.format(val),
            IntegerInput::I64(val) => buffer.format(val),
            IntegerInput::U64(val) => buffer.format(val),
            IntegerInput::ISIZE(val) => buffer.format(val),
            IntegerInput::USIZE(val) => buffer.format(val),
            IntegerInput::I128(val) => buffer.format(val),
            IntegerInput::U128(val) => buffer.format(val),
        };
    }
});