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// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// This file contains common things needed by numbers_test.cc,
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// numbers_legacy_test.cc and numbers_benchmark.cc.
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#ifndef ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
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#define ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
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#include <array>
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#include <cstdint>
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#include <limits>
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#include <string>
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#include "absl/base/config.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace strings_internal {
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template <typename IntType>
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inline bool Itoa(IntType value, int base, std::string* destination) {
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destination->clear();
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if (base <= 1 || base > 36) {
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return false;
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}
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if (value == 0) {
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destination->push_back('0');
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return true;
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}
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bool negative = value < 0;
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while (value != 0) {
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const IntType next_value = value / base;
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// Can't use std::abs here because of problems when IntType is unsigned.
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int remainder =
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static_cast<int>(value > next_value * base ? value - next_value * base
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: next_value * base - value);
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char c = remainder < 10 ? '0' + remainder : 'A' + remainder - 10;
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destination->insert(0, 1, c);
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value = next_value;
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}
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if (negative) {
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destination->insert(0, 1, '-');
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}
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return true;
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}
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struct uint32_test_case {
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const char* str;
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bool expect_ok;
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int base; // base to pass to the conversion function
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uint32_t expected;
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};
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inline const std::array<uint32_test_case, 27>& strtouint32_test_cases() {
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static const std::array<uint32_test_case, 27> test_cases{{
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{"0xffffffff", true, 16, (std::numeric_limits<uint32_t>::max)()},
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{"0x34234324", true, 16, 0x34234324},
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{"34234324", true, 16, 0x34234324},
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{"0", true, 16, 0},
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{" \t\n 0xffffffff", true, 16, (std::numeric_limits<uint32_t>::max)()},
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{" \f\v 46", true, 10, 46}, // must accept weird whitespace
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{" \t\n 72717222", true, 8, 072717222},
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{" \t\n 072717222", true, 8, 072717222},
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{" \t\n 072717228", false, 8, 07271722},
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{"0", true, 0, 0},
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// Base-10 version.
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{"34234324", true, 0, 34234324},
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{"4294967295", true, 0, (std::numeric_limits<uint32_t>::max)()},
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{"34234324 \n\t", true, 10, 34234324},
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// Unusual base
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{"0", true, 3, 0},
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{"2", true, 3, 2},
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{"11", true, 3, 4},
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// Invalid uints.
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{"", false, 0, 0},
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{" ", false, 0, 0},
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{"abc", false, 0, 0}, // would be valid hex, but prefix is missing
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{"34234324a", false, 0, 34234324},
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{"34234.3", false, 0, 34234},
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{"-1", false, 0, 0},
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{" -123", false, 0, 0},
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{" \t\n -123", false, 0, 0},
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// Out of bounds.
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{"4294967296", false, 0, (std::numeric_limits<uint32_t>::max)()},
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{"0x100000000", false, 0, (std::numeric_limits<uint32_t>::max)()},
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{nullptr, false, 0, 0},
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}};
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return test_cases;
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}
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struct uint64_test_case {
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const char* str;
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bool expect_ok;
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int base;
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uint64_t expected;
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};
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inline const std::array<uint64_test_case, 34>& strtouint64_test_cases() {
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static const std::array<uint64_test_case, 34> test_cases{{
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{"0x3423432448783446", true, 16, int64_t{0x3423432448783446}},
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{"3423432448783446", true, 16, int64_t{0x3423432448783446}},
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{"0", true, 16, 0},
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{"000", true, 0, 0},
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{"0", true, 0, 0},
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{" \t\n 0xffffffffffffffff", true, 16,
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(std::numeric_limits<uint64_t>::max)()},
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{"012345670123456701234", true, 8, int64_t{012345670123456701234}},
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{"12345670123456701234", true, 8, int64_t{012345670123456701234}},
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{"12845670123456701234", false, 8, 0},
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// Base-10 version.
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{"34234324487834466", true, 0, int64_t{34234324487834466}},
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{" \t\n 18446744073709551615", true, 0,
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(std::numeric_limits<uint64_t>::max)()},
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{"34234324487834466 \n\t ", true, 0, int64_t{34234324487834466}},
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{" \f\v 46", true, 10, 46}, // must accept weird whitespace
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// Unusual base
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{"0", true, 3, 0},
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{"2", true, 3, 2},
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{"11", true, 3, 4},
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{"0", true, 0, 0},
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// Invalid uints.
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{"", false, 0, 0},
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{" ", false, 0, 0},
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{"abc", false, 0, 0},
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{"34234324487834466a", false, 0, 0},
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{"34234487834466.3", false, 0, 0},
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{"-1", false, 0, 0},
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{" -123", false, 0, 0},
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{" \t\n -123", false, 0, 0},
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// Out of bounds.
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{"18446744073709551616", false, 10, 0},
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{"18446744073709551616", false, 0, 0},
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{"0x10000000000000000", false, 16,
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(std::numeric_limits<uint64_t>::max)()},
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{"0X10000000000000000", false, 16,
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(std::numeric_limits<uint64_t>::max)()}, // 0X versus 0x.
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{"0x10000000000000000", false, 0, (std::numeric_limits<uint64_t>::max)()},
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{"0X10000000000000000", false, 0,
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(std::numeric_limits<uint64_t>::max)()}, // 0X versus 0x.
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{"0x1234", true, 16, 0x1234},
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// Base-10 string version.
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{"1234", true, 0, 1234},
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{nullptr, false, 0, 0},
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}};
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return test_cases;
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}
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} // namespace strings_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
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