40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
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// A fuzzer for floating-point formatter.
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// For the license information refer to format.h.
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#include <cstdint>
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#include <cstdlib>
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#include <stdexcept>
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#include <limits>
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#include <fmt/format.h>
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#include "fuzzer-common.h"
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void check_round_trip(fmt::string_view format_str, double value) {
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auto buffer = fmt::memory_buffer();
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fmt::format_to(buffer, format_str, value);
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if (std::isnan(value)) {
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auto nan = std::signbit(value) ? "-nan" : "nan";
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if (fmt::string_view(buffer.data(), buffer.size()) != nan)
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throw std::runtime_error("round trip failure");
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return;
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}
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buffer.push_back('\0');
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char* ptr = nullptr;
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if (std::strtod(buffer.data(), &ptr) != value)
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throw std::runtime_error("round trip failure");
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if (ptr + 1 != buffer.end())
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throw std::runtime_error("unparsed output");
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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if (size <= sizeof(double) || !std::numeric_limits<double>::is_iec559)
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return 0;
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check_round_trip("{}", assign_from_buf<double>(data));
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// A larger than necessary precision is used to trigger the fallback
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// formatter.
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check_round_trip("{:.50g}", assign_from_buf<double>(data));
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return 0;
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}
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