summaryrefslogtreecommitdiff
path: root/absl/strings/internal/numbers_test_common.h
blob: 1a1e50c4d899163329875607b11a983c8b1b4752 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file contains common things needed by numbers_test.cc,
// numbers_legacy_test.cc and numbers_benchmark.cc.

#ifndef ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
#define ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_

#include <array>
#include <cstdint>
#include <limits>
#include <string>

#include "absl/base/config.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace strings_internal {

template <typename IntType>
inline bool Itoa(IntType value, int base, std::string* destination) {
  destination->clear();
  if (base <= 1 || base > 36) {
    return false;
  }

  if (value == 0) {
    destination->push_back('0');
    return true;
  }

  bool negative = value < 0;
  while (value != 0) {
    const IntType next_value = value / base;
    // Can't use std::abs here because of problems when IntType is unsigned.
    int remainder =
        static_cast<int>(value > next_value * base ? value - next_value * base
                                                   : next_value * base - value);
    char c = remainder < 10 ? '0' + remainder : 'A' + remainder - 10;
    destination->insert(0, 1, c);
    value = next_value;
  }

  if (negative) {
    destination->insert(0, 1, '-');
  }
  return true;
}

struct uint32_test_case {
  const char* str;
  bool expect_ok;
  int base;  // base to pass to the conversion function
  uint32_t expected;
};

inline const std::array<uint32_test_case, 27>& strtouint32_test_cases() {
  static const std::array<uint32_test_case, 27> test_cases{{
      {"0xffffffff", true, 16, (std::numeric_limits<uint32_t>::max)()},
      {"0x34234324", true, 16, 0x34234324},
      {"34234324", true, 16, 0x34234324},
      {"0", true, 16, 0},
      {" \t\n 0xffffffff", true, 16, (std::numeric_limits<uint32_t>::max)()},
      {" \f\v 46", true, 10, 46},  // must accept weird whitespace
      {" \t\n 72717222", true, 8, 072717222},
      {" \t\n 072717222", true, 8, 072717222},
      {" \t\n 072717228", false, 8, 07271722},
      {"0", true, 0, 0},

      // Base-10 version.
      {"34234324", true, 0, 34234324},
      {"4294967295", true, 0, (std::numeric_limits<uint32_t>::max)()},
      {"34234324 \n\t", true, 10, 34234324},

      // Unusual base
      {"0", true, 3, 0},
      {"2", true, 3, 2},
      {"11", true, 3, 4},

      // Invalid uints.
      {"", false, 0, 0},
      {"  ", false, 0, 0},
      {"abc", false, 0, 0},  // would be valid hex, but prefix is missing
      {"34234324a", false, 0, 34234324},
      {"34234.3", false, 0, 34234},
      {"-1", false, 0, 0},
      {"   -123", false, 0, 0},
      {" \t\n -123", false, 0, 0},

      // Out of bounds.
      {"4294967296", false, 0, (std::numeric_limits<uint32_t>::max)()},
      {"0x100000000", false, 0, (std::numeric_limits<uint32_t>::max)()},
      {nullptr, false, 0, 0},
  }};
  return test_cases;
}

struct uint64_test_case {
  const char* str;
  bool expect_ok;
  int base;
  uint64_t expected;
};

inline const std::array<uint64_test_case, 34>& strtouint64_test_cases() {
  static const std::array<uint64_test_case, 34> test_cases{{
      {"0x3423432448783446", true, 16, int64_t{0x3423432448783446}},
      {"3423432448783446", true, 16, int64_t{0x3423432448783446}},

      {"0", true, 16, 0},
      {"000", true, 0, 0},
      {"0", true, 0, 0},
      {" \t\n 0xffffffffffffffff", true, 16,
       (std::numeric_limits<uint64_t>::max)()},

      {"012345670123456701234", true, 8, int64_t{012345670123456701234}},
      {"12345670123456701234", true, 8, int64_t{012345670123456701234}},

      {"12845670123456701234", false, 8, 0},

      // Base-10 version.
      {"34234324487834466", true, 0, int64_t{34234324487834466}},

      {" \t\n 18446744073709551615", true, 0,
       (std::numeric_limits<uint64_t>::max)()},

      {"34234324487834466 \n\t ", true, 0, int64_t{34234324487834466}},

      {" \f\v 46", true, 10, 46},  // must accept weird whitespace

      // Unusual base
      {"0", true, 3, 0},
      {"2", true, 3, 2},
      {"11", true, 3, 4},

      {"0", true, 0, 0},

      // Invalid uints.
      {"", false, 0, 0},
      {"  ", false, 0, 0},
      {"abc", false, 0, 0},
      {"34234324487834466a", false, 0, 0},
      {"34234487834466.3", false, 0, 0},
      {"-1", false, 0, 0},
      {"   -123", false, 0, 0},
      {" \t\n -123", false, 0, 0},

      // Out of bounds.
      {"18446744073709551616", false, 10, 0},
      {"18446744073709551616", false, 0, 0},
      {"0x10000000000000000", false, 16,
       (std::numeric_limits<uint64_t>::max)()},
      {"0X10000000000000000", false, 16,
       (std::numeric_limits<uint64_t>::max)()},  // 0X versus 0x.
      {"0x10000000000000000", false, 0, (std::numeric_limits<uint64_t>::max)()},
      {"0X10000000000000000", false, 0,
       (std::numeric_limits<uint64_t>::max)()},  // 0X versus 0x.

      {"0x1234", true, 16, 0x1234},

      // Base-10 std::string version.
      {"1234", true, 0, 1234},
      {nullptr, false, 0, 0},
  }};
  return test_cases;
}

}  // namespace strings_internal
ABSL_NAMESPACE_END
}  // namespace absl

#endif  // ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_