1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
2 // See https://llvm.org/LICENSE.txt for license information.
3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
4 
5 // Simple test for a custom mutator.
6 #include <assert.h>
7 #include <cstddef>
8 #include <cstdint>
9 #include <cstdlib>
10 #include <iostream>
11 #include <ostream>
12 
13 #include "FuzzerInterface.h"
14 
15 static volatile int Sink;
16 
17 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
18   assert(Data);
19   if (Size > 0 && Data[0] == 'H') {
20     Sink = 1;
21     if (Size > 1 && Data[1] == 'i') {
22       Sink = 2;
23       if (Size > 2 && Data[2] == '!') {
24         std::cout << "BINGO; Found the target, exiting\n" << std::flush;
25         exit(1);
26       }
27     }
28   }
29   return 0;
30 }
31 
32 extern "C" size_t LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size,
33                                           size_t MaxSize, unsigned int Seed) {
34   static bool Printed;
35   if (!Printed) {
36     std::cerr << "In LLVMFuzzerCustomMutator\n";
37     Printed = true;
38   }
39   return LLVMFuzzerMutate(Data, Size, MaxSize);
40 }
41