1 // Copyright 2017 The Abseil Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 //
15 // This file contains common things needed by numbers_test.cc,
16 // numbers_legacy_test.cc and numbers_benchmark.cc.
17
18 #ifndef ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
19 #define ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
20
21 #include <array>
22 #include <cstdint>
23 #include <limits>
24 #include <string>
25
26 #include "absl/base/config.h"
27
28 namespace absl {
29 ABSL_NAMESPACE_BEGIN
30 namespace strings_internal {
31
32 template <typename IntType>
Itoa(IntType value,int base,std::string * destination)33 inline bool Itoa(IntType value, int base, std::string* destination) {
34 destination->clear();
35 if (base <= 1 || base > 36) {
36 return false;
37 }
38
39 if (value == 0) {
40 destination->push_back('0');
41 return true;
42 }
43
44 bool negative = value < 0;
45 while (value != 0) {
46 const IntType next_value = value / base;
47 // Can't use std::abs here because of problems when IntType is unsigned.
48 int remainder =
49 static_cast<int>(value > next_value * base ? value - next_value * base
50 : next_value * base - value);
51 char c = remainder < 10 ? '0' + remainder : 'A' + remainder - 10;
52 destination->insert(0, 1, c);
53 value = next_value;
54 }
55
56 if (negative) {
57 destination->insert(0, 1, '-');
58 }
59 return true;
60 }
61
62 struct uint32_test_case {
63 const char* str;
64 bool expect_ok;
65 int base; // base to pass to the conversion function
66 uint32_t expected;
67 };
68
strtouint32_test_cases()69 inline const std::array<uint32_test_case, 27>& strtouint32_test_cases() {
70 static const std::array<uint32_test_case, 27> test_cases{{
71 {"0xffffffff", true, 16, (std::numeric_limits<uint32_t>::max)()},
72 {"0x34234324", true, 16, 0x34234324},
73 {"34234324", true, 16, 0x34234324},
74 {"0", true, 16, 0},
75 {" \t\n 0xffffffff", true, 16, (std::numeric_limits<uint32_t>::max)()},
76 {" \f\v 46", true, 10, 46}, // must accept weird whitespace
77 {" \t\n 72717222", true, 8, 072717222},
78 {" \t\n 072717222", true, 8, 072717222},
79 {" \t\n 072717228", false, 8, 07271722},
80 {"0", true, 0, 0},
81
82 // Base-10 version.
83 {"34234324", true, 0, 34234324},
84 {"4294967295", true, 0, (std::numeric_limits<uint32_t>::max)()},
85 {"34234324 \n\t", true, 10, 34234324},
86
87 // Unusual base
88 {"0", true, 3, 0},
89 {"2", true, 3, 2},
90 {"11", true, 3, 4},
91
92 // Invalid uints.
93 {"", false, 0, 0},
94 {" ", false, 0, 0},
95 {"abc", false, 0, 0}, // would be valid hex, but prefix is missing
96 {"34234324a", false, 0, 34234324},
97 {"34234.3", false, 0, 34234},
98 {"-1", false, 0, 0},
99 {" -123", false, 0, 0},
100 {" \t\n -123", false, 0, 0},
101
102 // Out of bounds.
103 {"4294967296", false, 0, (std::numeric_limits<uint32_t>::max)()},
104 {"0x100000000", false, 0, (std::numeric_limits<uint32_t>::max)()},
105 {nullptr, false, 0, 0},
106 }};
107 return test_cases;
108 }
109
110 struct uint64_test_case {
111 const char* str;
112 bool expect_ok;
113 int base;
114 uint64_t expected;
115 };
116
strtouint64_test_cases()117 inline const std::array<uint64_test_case, 34>& strtouint64_test_cases() {
118 static const std::array<uint64_test_case, 34> test_cases{{
119 {"0x3423432448783446", true, 16, int64_t{0x3423432448783446}},
120 {"3423432448783446", true, 16, int64_t{0x3423432448783446}},
121
122 {"0", true, 16, 0},
123 {"000", true, 0, 0},
124 {"0", true, 0, 0},
125 {" \t\n 0xffffffffffffffff", true, 16,
126 (std::numeric_limits<uint64_t>::max)()},
127
128 {"012345670123456701234", true, 8, int64_t{012345670123456701234}},
129 {"12345670123456701234", true, 8, int64_t{012345670123456701234}},
130
131 {"12845670123456701234", false, 8, 0},
132
133 // Base-10 version.
134 {"34234324487834466", true, 0, int64_t{34234324487834466}},
135
136 {" \t\n 18446744073709551615", true, 0,
137 (std::numeric_limits<uint64_t>::max)()},
138
139 {"34234324487834466 \n\t ", true, 0, int64_t{34234324487834466}},
140
141 {" \f\v 46", true, 10, 46}, // must accept weird whitespace
142
143 // Unusual base
144 {"0", true, 3, 0},
145 {"2", true, 3, 2},
146 {"11", true, 3, 4},
147
148 {"0", true, 0, 0},
149
150 // Invalid uints.
151 {"", false, 0, 0},
152 {" ", false, 0, 0},
153 {"abc", false, 0, 0},
154 {"34234324487834466a", false, 0, 0},
155 {"34234487834466.3", false, 0, 0},
156 {"-1", false, 0, 0},
157 {" -123", false, 0, 0},
158 {" \t\n -123", false, 0, 0},
159
160 // Out of bounds.
161 {"18446744073709551616", false, 10, 0},
162 {"18446744073709551616", false, 0, 0},
163 {"0x10000000000000000", false, 16,
164 (std::numeric_limits<uint64_t>::max)()},
165 {"0X10000000000000000", false, 16,
166 (std::numeric_limits<uint64_t>::max)()}, // 0X versus 0x.
167 {"0x10000000000000000", false, 0, (std::numeric_limits<uint64_t>::max)()},
168 {"0X10000000000000000", false, 0,
169 (std::numeric_limits<uint64_t>::max)()}, // 0X versus 0x.
170
171 {"0x1234", true, 16, 0x1234},
172
173 // Base-10 std::string version.
174 {"1234", true, 0, 1234},
175 {nullptr, false, 0, 0},
176 }};
177 return test_cases;
178 }
179
180 } // namespace strings_internal
181 ABSL_NAMESPACE_END
182 } // namespace absl
183
184 #endif // ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
185