blame: source/misc/embedded_libs/fmt-11.0.2/test/fuzzing/named-arg.cc

// Copyright (c) 2019, Paul Dreik

// For the license information refer to format.h.

#include <fmt/chrono.h>

#include <cstdint>

#include <type_traits>

#include <vector>

#include "fuzzer-common.h"

template <typename T>

void invoke_fmt(const uint8_t* data, size_t size, unsigned arg_name_size) {

  static_assert(sizeof(T) <= fixed_size, "fixed_size too small");

  if (size <= fixed_size) return;

  const T value = assign_from_buf<T>(data);

  data += fixed_size;

  size -= fixed_size;

  if (arg_name_size <= 0 || arg_name_size >= size) return;

  data_to_string arg_name(data, arg_name_size, true);

  data += arg_name_size;

  size -= arg_name_size;

  data_to_string format_str(data, size);

  try {

#if FMT_FUZZ_FORMAT_TO_STRING

    std::string message =

        fmt::format(format_str.get(), fmt::arg(arg_name.data(), value));

#else

    fmt::memory_buffer out;

    fmt::format_to(std::back_inserter(out), format_str.get(),

                   fmt::arg(arg_name.data(), value));

#endif

  } catch (std::exception&) {

  }

}

// For dynamic dispatching to an explicit instantiation.

template <typename Callback> void invoke(int type, Callback callback) {

  switch (type) {

  case 0:

    callback(bool());

    break;

  case 1:

    callback(char());

    break;

  case 2:

    using sc = signed char;

    callback(sc());

    break;

  case 3:

    using uc = unsigned char;

    callback(uc());

    break;

  case 4:

    callback(short());

    break;

  case 5:

    using us = unsigned short;

    callback(us());

    break;

  case 6:

    callback(int());

    break;

  case 7:

    callback(unsigned());

    break;

  case 8:

    callback(long());

    break;

  case 9:

    using ul = unsigned long;

    callback(ul());

    break;

  case 10:

    callback(float());

    break;

  case 11:

    callback(double());

    break;

  case 12:

    using LD = long double;

    callback(LD());

    break;

  }

}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {

  if (size <= 3) return 0;

  // Switch types depending on the first byte of the input.

  const auto type = data[0] & 0x0F;

  const unsigned arg_name_size = (data[0] & 0xF0) >> 4;

  data++;

  size--;

  invoke(type, [=](auto arg) {

    invoke_fmt<decltype(arg)>(data, size, arg_name_size);

  });

  return 0;

}