mirror of
https://github.com/fmtlib/fmt.git
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132 lines
3.1 KiB
C++
132 lines
3.1 KiB
C++
// Copyright (c) 2019, Paul Dreik
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// License: see LICENSE.rst in the fmt root directory
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#include <fmt/core.h>
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#include <cstdint>
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#include <stdexcept>
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#include <type_traits>
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#include <vector>
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#include <fmt/chrono.h>
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#include "fuzzer_common.h"
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using fmt_fuzzer::Nfixed;
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template <typename Item>
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void invoke_fmt(const uint8_t* Data, std::size_t Size) {
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constexpr auto N = sizeof(Item);
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static_assert(N <= Nfixed, "Nfixed is too small");
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if (Size <= Nfixed) {
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return;
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}
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const Item item = fmt_fuzzer::assignFromBuf<Item>(Data);
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Data += Nfixed;
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Size -= Nfixed;
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#if FMT_FUZZ_SEPARATE_ALLOCATION
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// allocates as tight as possible, making it easier to catch buffer overruns.
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std::vector<char> fmtstringbuffer(Size);
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std::memcpy(fmtstringbuffer.data(), Data, Size);
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auto fmtstring = fmt::string_view(fmtstringbuffer.data(), Size);
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#else
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auto fmtstring = fmt::string_view(fmt_fuzzer::as_chars(Data), Size);
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#endif
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#if FMT_FUZZ_FORMAT_TO_STRING
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std::string message = fmt::format(fmtstring, item);
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#else
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fmt::memory_buffer message;
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fmt::format_to(message, fmtstring, item);
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#endif
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}
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void invoke_fmt_time(const uint8_t* Data, std::size_t Size) {
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using Item = std::time_t;
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constexpr auto N = sizeof(Item);
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static_assert(N <= Nfixed, "Nfixed too small");
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if (Size <= Nfixed) {
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return;
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}
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const Item item = fmt_fuzzer::assignFromBuf<Item>(Data);
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Data += Nfixed;
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Size -= Nfixed;
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#if FMT_FUZZ_SEPARATE_ALLOCATION
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// allocates as tight as possible, making it easier to catch buffer overruns.
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std::vector<char> fmtstringbuffer(Size);
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std::memcpy(fmtstringbuffer.data(), Data, Size);
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auto fmtstring = fmt::string_view(fmtstringbuffer.data(), Size);
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#else
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auto fmtstring = fmt::string_view(fmt_fuzzer::as_chars(Data), Size);
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#endif
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auto* b = std::localtime(&item);
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if (b) {
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#if FMT_FUZZ_FORMAT_TO_STRING
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std::string message = fmt::format(fmtstring, *b);
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#else
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fmt::memory_buffer message;
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fmt::format_to(message, fmtstring, *b);
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#endif
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}
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, std::size_t Size) {
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if (Size <= 3) {
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return 0;
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}
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const auto first = Data[0];
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Data++;
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Size--;
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try {
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switch (first) {
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case 0:
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invoke_fmt<bool>(Data, Size);
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break;
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case 1:
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invoke_fmt<char>(Data, Size);
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break;
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case 2:
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invoke_fmt<unsigned char>(Data, Size);
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break;
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case 3:
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invoke_fmt<signed char>(Data, Size);
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break;
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case 4:
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invoke_fmt<short>(Data, Size);
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break;
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case 5:
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invoke_fmt<unsigned short>(Data, Size);
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break;
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case 6:
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invoke_fmt<int>(Data, Size);
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break;
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case 7:
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invoke_fmt<unsigned int>(Data, Size);
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break;
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case 8:
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invoke_fmt<long>(Data, Size);
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break;
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case 9:
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invoke_fmt<unsigned long>(Data, Size);
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break;
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case 10:
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invoke_fmt<float>(Data, Size);
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break;
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case 11:
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invoke_fmt<double>(Data, Size);
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break;
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case 12:
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invoke_fmt<long double>(Data, Size);
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break;
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case 13:
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invoke_fmt_time(Data, Size);
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break;
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default:
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break;
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}
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} catch (std::exception& /*e*/) {
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}
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return 0;
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}
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