1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <gtest/gtest.h>
18
19#include <stdint.h>
20#include <limits>
21#include <sstream>
22
23// TODO: move this test to libcxx.
24
25template <typename T>
26static void CheckOverflow(T expected, const char* value, bool should_overflow) {
27  std::stringstream ss(value);
28  T result = T(0);
29  ss >> result;
30  EXPECT_FALSE(ss.bad()) << value << ' ' << int64_t(result);
31  EXPECT_EQ(should_overflow, ss.fail()) << value << ' ' << int64_t(result);
32  if (!should_overflow) { // glibc writes garbage on overflow.
33    ASSERT_EQ(expected, result) << value;
34  }
35}
36
37TEST(sstream, __get_integer_overflow_8) {
38  // The usual byte/char confusion means that operator>> on 8-bit types is used
39  // for chars, so there's no possibility of overflow.
40}
41
42TEST(sstream, __get_integer_overflow_16) {
43  CheckOverflow<int16_t>(std::numeric_limits<int16_t>::min(), "-32768", false);
44  CheckOverflow<int16_t>(0, "-32769", true);
45  CheckOverflow<int16_t>(std::numeric_limits<int16_t>::max(), "32767", false);
46  CheckOverflow<int16_t>(0, "32768", true);
47
48  CheckOverflow<uint16_t>(std::numeric_limits<uint16_t>::max(), "65535", false);
49  CheckOverflow<uint16_t>(0, "65536", true);
50}
51
52TEST(sstream, __get_integer_overflow_32) {
53  CheckOverflow<int32_t>(std::numeric_limits<int32_t>::min(), "-2147483648", false);
54  CheckOverflow<int32_t>(0, "-2147483649", true);
55  CheckOverflow<int32_t>(std::numeric_limits<int32_t>::max(), "2147483647", false);
56  CheckOverflow<int32_t>(0, "2147483648", true);
57
58  CheckOverflow<uint32_t>(std::numeric_limits<uint32_t>::max(), "4294967295", false);
59  CheckOverflow<uint32_t>(0, "4294967296", true);
60}
61
62TEST(sstream, __get_integer_overflow_64) {
63  CheckOverflow<int64_t>(std::numeric_limits<int64_t>::min(), "-9223372036854775808", false);
64  CheckOverflow<int64_t>(0, "-9223372036854775809", true);
65  CheckOverflow<int64_t>(std::numeric_limits<int64_t>::max(), "9223372036854775807", false);
66  CheckOverflow<int64_t>(0, "9223372036854775808", true);
67
68  CheckOverflow<uint64_t>(std::numeric_limits<uint64_t>::max(), "18446744073709551615", false);
69  CheckOverflow<uint64_t>(0, "18446744073709551616", true);
70}
71