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// Copyright (c) 2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <cstdint>
#include <string>
#include <vector>
#if defined(__has_builtin)
#if __has_builtin(__builtin_mul_overflow)
#define HAVE_BUILTIN_MUL_OVERFLOW
#endif
#elif defined(__GNUC__)
#define HAVE_BUILTIN_MUL_OVERFLOW
#endif
namespace {
template <typename T>
void TestMultiplicationOverflow(FuzzedDataProvider& fuzzed_data_provider)
{
const T i = fuzzed_data_provider.ConsumeIntegral<T>();
const T j = fuzzed_data_provider.ConsumeIntegral<T>();
const bool is_multiplication_overflow_custom = MultiplicationOverflow(i, j);
#if defined(HAVE_BUILTIN_MUL_OVERFLOW)
T result_builtin;
const bool is_multiplication_overflow_builtin = __builtin_mul_overflow(i, j, &result_builtin);
assert(is_multiplication_overflow_custom == is_multiplication_overflow_builtin);
if (!is_multiplication_overflow_custom) {
assert(i * j == result_builtin);
}
#else
if (!is_multiplication_overflow_custom) {
(void)(i * j);
}
#endif
}
} // namespace
FUZZ_TARGET(multiplication_overflow)
{
FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
TestMultiplicationOverflow<int64_t>(fuzzed_data_provider);
TestMultiplicationOverflow<uint64_t>(fuzzed_data_provider);
TestMultiplicationOverflow<int32_t>(fuzzed_data_provider);
TestMultiplicationOverflow<uint32_t>(fuzzed_data_provider);
TestMultiplicationOverflow<int16_t>(fuzzed_data_provider);
TestMultiplicationOverflow<uint16_t>(fuzzed_data_provider);
TestMultiplicationOverflow<char>(fuzzed_data_provider);
TestMultiplicationOverflow<unsigned char>(fuzzed_data_provider);
TestMultiplicationOverflow<signed char>(fuzzed_data_provider);
}
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