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annotate dep/fmt/test/fuzzing/two-args.cc @ 343:1faa72660932

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*: transfer back to cmake from autotools autotools just made lots of things more complicated than they should have and many things broke (i.e. translations)
author Paper <paper@paper.us.eu.org>
date Thu, 20 Jun 2024 05:56:06 -0400
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343
1faa72660932 *: transfer back to cmake from autotools
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/format.h>
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5
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6 #include <cstdint>
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7 #include <exception>
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8 #include <string>
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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 Item1, typename Item2>
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13 void invoke_fmt(const uint8_t* data, size_t size) {
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14 static_assert(sizeof(Item1) <= fixed_size, "size1 exceeded");
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15 static_assert(sizeof(Item2) <= fixed_size, "size2 exceeded");
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16 if (size <= fixed_size + fixed_size) return;
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17
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18 const Item1 item1 = assign_from_buf<Item1>(data);
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19 data += fixed_size;
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20 size -= fixed_size;
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21
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22 const Item2 item2 = assign_from_buf<Item2>(data);
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23 data += fixed_size;
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24 size -= fixed_size;
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25
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26 auto format_str = fmt::string_view(as_chars(data), size);
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27 #if FMT_FUZZ_FORMAT_TO_STRING
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28 std::string message = fmt::format(format_str, item1, item2);
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29 #else
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30 auto buf = fmt::memory_buffer();
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31 fmt::format_to(std::back_inserter(buf), format_str, item1, item2);
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32 #endif
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33 }
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34
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35 // For dynamic dispatching to an explicit instantiation.
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36 template <typename Callback> void invoke(int index, Callback callback) {
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37 switch (index) {
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38 case 0:
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39 callback(bool());
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40 break;
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41 case 1:
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42 callback(char());
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43 break;
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44 case 2:
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45 using sc = signed char;
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46 callback(sc());
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47 break;
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48 case 3:
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49 using uc = unsigned char;
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50 callback(uc());
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51 break;
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52 case 4:
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53 callback(short());
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54 break;
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55 case 5:
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56 using us = unsigned short;
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57 callback(us());
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58 break;
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59 case 6:
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60 callback(int());
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61 break;
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62 case 7:
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63 callback(unsigned());
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64 break;
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65 case 8:
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66 callback(long());
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67 break;
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68 case 9:
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69 using ul = unsigned long;
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70 callback(ul());
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71 break;
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72 case 10:
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73 callback(float());
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74 break;
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75 case 11:
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76 callback(double());
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77 break;
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78 case 12:
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79 using LD = long double;
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80 callback(LD());
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81 break;
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82 case 13:
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83 using ptr = void*;
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84 callback(ptr());
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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 type1 = data[0] & 0x0F;
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94 const auto type2 = (data[0] & 0xF0) >> 4;
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95 data++;
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96 size--;
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97 try {
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98 invoke(type1, [=](auto param1) {
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99 invoke(type2, [=](auto param2) {
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100 invoke_fmt<decltype(param1), decltype(param2)>(data, size);
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101 });
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102 });
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103 } catch (std::exception&) {
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104 }
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105 return 0;
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106 }