1 // A fuzzer for floating-point formatter. 2 // For the license information refer to format.h. 3 4 #include <cstdint> 5 #include <cstdlib> 6 #include <stdexcept> 7 #include <limits> 8 #include <fmt/format.h> 9 10 #include "fuzzer-common.h" 11 LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)12extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { 13 if (size <= sizeof(double) || !std::numeric_limits<double>::is_iec559) 14 return 0; 15 16 auto value = assign_from_buf<double>(data); 17 auto buffer = fmt::memory_buffer(); 18 fmt::format_to(buffer, "{}", value); 19 20 // Check a round trip. 21 if (std::isnan(value)) { 22 auto nan = std::signbit(value) ? "-nan" : "nan"; 23 if (fmt::string_view(buffer.data(), buffer.size()) != nan) 24 throw std::runtime_error("round trip failure"); 25 return 0; 26 } 27 buffer.push_back('\0'); 28 char* ptr = nullptr; 29 if (std::strtod(buffer.data(), &ptr) != value) 30 throw std::runtime_error("round trip failure"); 31 if (ptr + 1 != buffer.end()) 32 throw std::runtime_error("unparsed output"); 33 return 0; 34 } 35