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 #include <stdint.h>
6 #include <stdio.h>
7 #include <stdlib.h>
8 
9 // Dummy functions used to avoid dependency on AFL.
10 extern "C" void __afl_manual_init() {}
11 
12 extern "C" int __afl_persistent_loop(unsigned int N) {
13   static int Count = N;
14   fprintf(stderr, "__afl_persistent_loop called, Count = %d\n", Count);
15   return Count--;
16 }
17 
18 // This declaration exists to prevent the Darwin linker
19 // from complaining about this being a missing weak symbol.
20 extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
21   return 0;
22 }
23 
24 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
25   puts("STDOUT MESSAGE");
26   fflush(stdout);
27   fprintf(stderr, "STDERR MESSAGE\n"
28                   "LLVMFuzzerTestOneInput called; Size = %zd\n",
29           Size);
30   if (Size < 4)
31     return 0;
32 
33   return Data[Size];
34 }
35