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// 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>
namespace absl {
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
} // namespace absl
#endif // ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
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