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
25 template <typename T>
CheckOverflow(T expected,const char * value,bool should_overflow)26 static 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
TEST(sstream,__get_integer_overflow_8)37 TEST(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
TEST(sstream,__get_integer_overflow_16)42 TEST(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
TEST(sstream,__get_integer_overflow_32)52 TEST(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
TEST(sstream,__get_integer_overflow_64)62 TEST(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