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// A fuzzer for floating-point formatter.
// For the license information refer to format.h.
#include <cstdint>
#include <cstdlib>
#include <stdexcept>
#include <limits>
#include <fmt/format.h>
#include "fuzzer-common.h"
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
if (size <= sizeof(double) || !std::numeric_limits<double>::is_iec559)
return 0;
auto value = assign_from_buf<double>(data);
auto buffer = fmt::memory_buffer();
fmt::format_to(buffer, "{}", value);
// Check a round trip.
if (std::isnan(value)) {
auto nan = std::signbit(value) ? "-nan" : "nan";
if (fmt::string_view(buffer.data(), buffer.size()) != nan)
throw std::runtime_error("round trip failure");
return 0;
}
buffer.push_back('\0');
char* ptr = nullptr;
if (std::strtod(buffer.data(), &ptr) != value)
throw std::runtime_error("round trip failure");
if (ptr + 1 != buffer.end())
throw std::runtime_error("unparsed output");
return 0;
}
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