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annotate dep/fmt/test/fuzzing/named-arg.cc @ 379:5eaafed6c10b

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*: clang-format
author Paper <paper@tflc.us>
date Wed, 05 Nov 2025 12:59:46 -0500
parents 1faa72660932
children
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343
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Paper <paper@paper.us.eu.org>
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1 // Copyright (c) 2019, Paul Dreik
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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/chrono.h>
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5
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6 #include <cstdint>
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7 #include <type_traits>
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8 #include <vector>
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9
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10 #include "fuzzer-common.h"
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11
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12 template <typename T>
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13 void invoke_fmt(const uint8_t* data, size_t size, unsigned arg_name_size) {
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14 static_assert(sizeof(T) <= fixed_size, "fixed_size too small");
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15 if (size <= fixed_size) return;
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16 const T value = assign_from_buf<T>(data);
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17 data += fixed_size;
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18 size -= fixed_size;
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19
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20 if (arg_name_size <= 0 || arg_name_size >= size) return;
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21 data_to_string arg_name(data, arg_name_size, true);
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22 data += arg_name_size;
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23 size -= arg_name_size;
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24
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25 data_to_string format_str(data, size);
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26 try {
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27 #if FMT_FUZZ_FORMAT_TO_STRING
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28 std::string message =
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29 fmt::format(format_str.get(), fmt::arg(arg_name.data(), value));
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30 #else
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31 fmt::memory_buffer out;
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32 fmt::format_to(std::back_inserter(out), format_str.get(),
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33 fmt::arg(arg_name.data(), value));
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34 #endif
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35 } catch (std::exception&) {
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36 }
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37 }
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38
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39 // For dynamic dispatching to an explicit instantiation.
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40 template <typename Callback> void invoke(int type, Callback callback) {
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41 switch (type) {
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42 case 0:
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43 callback(bool());
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44 break;
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45 case 1:
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46 callback(char());
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47 break;
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48 case 2:
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49 using sc = signed char;
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50 callback(sc());
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51 break;
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52 case 3:
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53 using uc = unsigned char;
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54 callback(uc());
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55 break;
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56 case 4:
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57 callback(short());
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58 break;
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59 case 5:
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60 using us = unsigned short;
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61 callback(us());
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62 break;
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63 case 6:
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64 callback(int());
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65 break;
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66 case 7:
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67 callback(unsigned());
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68 break;
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69 case 8:
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70 callback(long());
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71 break;
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72 case 9:
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73 using ul = unsigned long;
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74 callback(ul());
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75 break;
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76 case 10:
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77 callback(float());
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78 break;
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79 case 11:
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80 callback(double());
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81 break;
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82 case 12:
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83 using LD = long double;
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84 callback(LD());
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85 break;
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86 }
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87 }
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88
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89 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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90 if (size <= 3) return 0;
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91
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92 // Switch types depending on the first byte of the input.
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93 const auto type = data[0] & 0x0F;
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94 const unsigned arg_name_size = (data[0] & 0xF0) >> 4;
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95 data++;
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96 size--;
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97
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98 invoke(type, [=](auto arg) {
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99 invoke_fmt<decltype(arg)>(data, size, arg_name_size);
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100 });
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101 return 0;
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102 }