compiler-rt/test/fuzzer/ImplicitUnsignedIntegerTruncationTest.cpp

// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.

// Test for unsigned-integer-overflow.
#include <assert.h>
#include <climits>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <iostream>

static volatile int Sink;
static unsigned char Large = UINT8_MAX;

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  assert(Data);
  if (Size > 0 && Data[0] == 'H') {
    Sink = 1;
    if (Size > 1 && Data[1] == 'i') {
      Sink = 2;
      if (Size > 2 && Data[2] == '!') {
        Large = (unsigned int)Large + 1U;  // 'char overflow'.
      }
    }
  }
  return 0;
}