xref: /llvm-project/compiler-rt/test/fuzzer/Switch2Test.cpp (revision 2946cd701067404b99c39fb29dc9c74bd7193eb3)
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 fuzzer. The fuzzer must find the interesting switch value.
6 #include <cstddef>
7 #include <cstdint>
8 #include <cstdio>
9 #include <cstdlib>
10 #include <cstring>
11 
Switch(int a)12 int Switch(int a) {
13   switch(a) {
14     case 100001: return 1;
15     case 100002: return 2;
16     case 100003: return 4;
17   }
18   return 0;
19 }
20 
LLVMFuzzerTestOneInput(const uint8_t * Data,size_t Size)21 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
22   const int N = 3;
23   if (Size < N * sizeof(int)) return 0;
24   int Res = 0;
25   for (int i = 0; i < N; i++) {
26     int X;
27     memcpy(&X, Data + i * sizeof(int), sizeof(int));
28     Res += Switch(X);
29   }
30   if (Res == 5 || Res == 3 || Res == 6 || Res == 7) {
31     fprintf(stderr, "BINGO; Found the target, exiting; Res=%d\n", Res);
32     exit(1);
33   }
34   return 0;
35 }
36 
37