ceph/src/fmt/test/fuzzing/chrono-timepoint.cc

   1 // Copyright (c) 2021, Paul Dreik
   2 // For license information refer to format.h.
   3 #include <fmt/chrono.h>
   4
   5 #include "fuzzer-common.h"
   6
   7 /*
   8  * a fuzzer for the chrono timepoints formatters
   9  * C is a clock (std::chrono::system_clock etc)
  10  */
  11 template <typename C> void doit(const uint8_t* data, size_t size) {
  12   using Rep = typename C::time_point::rep;
  13   constexpr auto N = sizeof(Rep);
  14   if (size < N) return;
  15
  16   const auto x = assign_from_buf<Rep>(data);
  17   typename C::duration dur{x};
  18   typename C::time_point timepoint{dur};
  19   data += N;
  20   size -= N;
  21   data_to_string format_str(data, size);
  22
  23   std::string message = fmt::format(format_str.get(), timepoint);
  24 }
  25
  26 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  27   try {
  28     doit<std::chrono::system_clock>(data, size);
  29   } catch (...) {
  30   }
  31   return 0;
  32 }