charconv/fuzzing/fuzz_from_chars_float.cpp

// Copyright 2024 Matt Borland
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt

#include <boost/charconv.hpp>
#include <boost/core/detail/string_view.hpp>
#include <iostream>
#include <exception>

extern "C" int LLVMFuzzerTestOneInput(const std::uint8_t* data, std::size_t size)
{
    try
    {
        auto c_data = reinterpret_cast<const char*>(data);

        const auto formats = {boost::charconv::chars_format::general, boost::charconv::chars_format::fixed,
                              boost::charconv::chars_format::scientific, boost::charconv::chars_format::hex};

        boost::core::string_view sv {c_data, size};

        for (const auto format : formats)
        {
            float f_val;
            boost::charconv::from_chars(c_data, c_data + size, f_val, format);
            boost::charconv::from_chars(sv, f_val, format);

            double val;
            boost::charconv::from_chars(c_data, c_data + size, val, format);
            boost::charconv::from_chars(sv, val, format);

            long double ld_val;
            boost::charconv::from_chars(c_data, c_data + size, ld_val, format);
            boost::charconv::from_chars(sv, ld_val, format);
        }
    }
    catch(...)
    {
        std::cerr << "Error with: " << data << std::endl;
        std::terminate();
    }

    return 0;
}