d98bf8776b
mutating the first byte of the input now always results in picking on of the two paths. Before, two of the four possible outcomes resulted in doit() not being invoked.
52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
// Copyright (c) 2021, Paul Dreik
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// For license information refer to format.h.
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#include <fmt/chrono.h>
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#include "fuzzer-common.h"
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/*
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* a fuzzer for the chrono timepoints formatters
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* C is a clock (std::chrono::system_clock etc)
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*/
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template <typename C> void doit(const uint8_t* data, size_t size) {
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using D = typename C::duration;
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using TP = typename C::time_point;
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using Rep = typename TP::rep;
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constexpr auto N = sizeof(Rep);
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if (size < N) return;
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const auto x = assign_from_buf<Rep>(data);
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D dur{x};
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TP timepoint{dur};
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data += N;
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size -= N;
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data_to_string format_str(data, size);
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std::string message = fmt::format(format_str.get(), timepoint);
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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 < 1) return 0;
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const auto action = data[0] & 0b1;
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data += 1;
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size -= 1;
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try {
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switch (action) {
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case 0:
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doit<std::chrono::system_clock>(data, size);
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break;
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case 1:
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// may be the same as system_clock
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doit<std::chrono::high_resolution_clock>(data, size);
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break;
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case 2:
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// won't compile
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// doit<std::chrono::steady_clock>(data,size);
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break;
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}
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} catch (...) {
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}
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return 0;
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}
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