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annotate dep/fmt/test/fuzzing/float.cc @ 343:1faa72660932

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*: transfer back to cmake from autotools autotools just made lots of things more complicated than they should have and many things broke (i.e. translations)
author Paper <paper@paper.us.eu.org>
date Thu, 20 Jun 2024 05:56:06 -0400
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343
1faa72660932 *: transfer back to cmake from autotools
Paper <paper@paper.us.eu.org>
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1 // A fuzzer for floating-point formatter.
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2 // For the license information refer to format.h.
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3
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4 #include <fmt/format.h>
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5
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6 #include <cstdint>
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7 #include <cstdlib>
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8 #include <limits>
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9 #include <stdexcept>
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10
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11 #include "fuzzer-common.h"
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12
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13 void check_round_trip(fmt::string_view format_str, double value) {
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14 auto buffer = fmt::memory_buffer();
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15 fmt::format_to(std::back_inserter(buffer), format_str, value);
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16
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17 if (std::isnan(value)) {
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18 auto nan = std::signbit(value) ? "-nan" : "nan";
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19 if (fmt::string_view(buffer.data(), buffer.size()) != nan)
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20 throw std::runtime_error("round trip failure");
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21 return;
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22 }
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23
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24 buffer.push_back('\0');
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25 char* ptr = nullptr;
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26 if (std::strtod(buffer.data(), &ptr) != value)
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27 throw std::runtime_error("round trip failure");
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28 if (ptr + 1 != buffer.end()) throw std::runtime_error("unparsed output");
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29 }
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30
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31 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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32 if (size <= sizeof(double) || !std::numeric_limits<double>::is_iec559)
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33 return 0;
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34 check_round_trip("{}", assign_from_buf<double>(data));
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35 // A larger than necessary precision is used to trigger the fallback
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36 // formatter.
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37 check_round_trip("{:.50g}", assign_from_buf<double>(data));
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38 return 0;
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39 }