ClickHouse/utils/libfuzzer-test/test_basic_fuzzer/main.cpp

#include <stdint.h>
#include <stddef.h>

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
    if (size > 0 && data[0] == 'H')
        if (size > 1 && data[1] == 'I')
            if (size > 2 && data[2] == '!')
                __builtin_trap();
    return 0;
}