| // Copyright 2014 The Crashpad Authors. All rights reserved. |
| // |
| // 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 |
| // |
| // http://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. |
| |
| #include "util/stdlib/string_number_conversion.h" |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #include <inttypes.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <limits> |
| |
| #include "base/logging.h" |
| #include "util/stdlib/cxx.h" |
| |
| // CONSTEXPR_STATIC_ASSERT will be a normal static_assert if the C++ library is |
| // the C++11 library. If using an older C++ library, the |
| // std::numeric_limits<>::min() and max() functions will not be marked as |
| // constexpr, and thus won’t be usable with static_assert(). In that case, a |
| // run-time CHECK() will have to do. |
| #if CXX_LIBRARY_HAS_CONSTEXPR |
| #define CONSTEXPR_STATIC_ASSERT(condition, message) \ |
| static_assert(condition, message) |
| #else |
| #define CONSTEXPR_STATIC_ASSERT(condition, message) CHECK(condition) << message |
| #endif |
| |
| namespace { |
| |
| template <typename TIntType, typename TLongType> |
| struct StringToIntegerTraits { |
| using IntType = TIntType; |
| using LongType = TLongType; |
| static void TypeCheck() { |
| static_assert(std::numeric_limits<TIntType>::is_integer && |
| std::numeric_limits<TLongType>::is_integer, |
| "IntType and LongType must be integer"); |
| static_assert(std::numeric_limits<TIntType>::is_signed == |
| std::numeric_limits<TLongType>::is_signed, |
| "IntType and LongType signedness must agree"); |
| CONSTEXPR_STATIC_ASSERT(std::numeric_limits<TIntType>::min() >= |
| std::numeric_limits<TLongType>::min() && |
| std::numeric_limits<TIntType>::min() < |
| std::numeric_limits<TLongType>::max(), |
| "IntType min must be in LongType range"); |
| CONSTEXPR_STATIC_ASSERT(std::numeric_limits<TIntType>::max() > |
| std::numeric_limits<TLongType>::min() && |
| std::numeric_limits<TIntType>::max() <= |
| std::numeric_limits<TLongType>::max(), |
| "IntType max must be in LongType range"); |
| } |
| }; |
| |
| template <typename TIntType, typename TLongType> |
| struct StringToSignedIntegerTraits |
| : public StringToIntegerTraits<TIntType, TLongType> { |
| static void TypeCheck() { |
| static_assert(std::numeric_limits<TIntType>::is_signed, |
| "StringToSignedTraits IntType must be signed"); |
| return super::TypeCheck(); |
| } |
| static bool IsNegativeOverflow(TLongType value) { |
| return value < std::numeric_limits<TIntType>::min(); |
| } |
| |
| private: |
| using super = StringToIntegerTraits<TIntType, TLongType>; |
| }; |
| |
| template <typename TIntType, typename TLongType> |
| struct StringToUnsignedIntegerTraits |
| : public StringToIntegerTraits<TIntType, TLongType> { |
| static void TypeCheck() { |
| static_assert(!std::numeric_limits<TIntType>::is_signed, |
| "StringToUnsignedTraits IntType must be unsigned"); |
| return super::TypeCheck(); |
| } |
| static bool IsNegativeOverflow(TLongType value) { return false; } |
| |
| private: |
| using super = StringToIntegerTraits<TIntType, TLongType>; |
| }; |
| |
| struct StringToIntTraits : public StringToSignedIntegerTraits<int, long> { |
| static LongType Convert(const char* str, char** end, int base) { |
| return strtol(str, end, base); |
| } |
| }; |
| |
| struct StringToUnsignedIntTraits |
| : public StringToUnsignedIntegerTraits<unsigned int, unsigned long> { |
| static LongType Convert(const char* str, char** end, int base) { |
| if (str[0] == '-') { |
| *end = const_cast<char*>(str); |
| return 0; |
| } |
| return strtoul(str, end, base); |
| } |
| }; |
| |
| struct StringToUnsignedInt64Traits |
| : public StringToUnsignedIntegerTraits<uint64_t, uint64_t> { |
| static LongType Convert(const char* str, char** end, int base) { |
| if (str[0] == '-') { |
| *end = const_cast<char*>(str); |
| return 0; |
| } |
| return strtoull(str, end, base); |
| } |
| }; |
| |
| template <typename Traits> |
| bool StringToIntegerInternal(const base::StringPiece& string, |
| typename Traits::IntType* number) { |
| using IntType = typename Traits::IntType; |
| using LongType = typename Traits::LongType; |
| |
| Traits::TypeCheck(); |
| |
| if (string.empty() || isspace(string[0])) { |
| return false; |
| } |
| |
| if (string[string.length()] != '\0') { |
| // The implementations use the C standard library’s conversion routines, |
| // which rely on the strings having a trailing NUL character. std::string |
| // will NUL-terminate. |
| std::string terminated_string(string.data(), string.length()); |
| return StringToIntegerInternal<Traits>(terminated_string, number); |
| } |
| |
| errno = 0; |
| char* end; |
| LongType result = Traits::Convert(string.data(), &end, 0); |
| if (Traits::IsNegativeOverflow(result) || |
| result > std::numeric_limits<IntType>::max() || |
| errno == ERANGE || |
| end != string.data() + string.length()) { |
| return false; |
| } |
| *number = result; |
| return true; |
| } |
| |
| } // namespace |
| |
| namespace crashpad { |
| |
| bool StringToNumber(const base::StringPiece& string, int* number) { |
| return StringToIntegerInternal<StringToIntTraits>(string, number); |
| } |
| |
| bool StringToNumber(const base::StringPiece& string, unsigned int* number) { |
| return StringToIntegerInternal<StringToUnsignedIntTraits>(string, number); |
| } |
| |
| bool StringToNumber(const base::StringPiece& string, uint64_t* number) { |
| return StringToIntegerInternal<StringToUnsignedInt64Traits>(string, number); |
| } |
| |
| } // namespace crashpad |