| // -*- C++ -*- |
| //===------------------------------ charconv ------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP_CHARCONV |
| #define _LIBCPP_CHARCONV |
| |
| /* |
| charconv synopsis |
| |
| namespace std { |
| |
| // floating-point format for primitive numerical conversion |
| enum class chars_format { |
| scientific = unspecified, |
| fixed = unspecified, |
| hex = unspecified, |
| general = fixed | scientific |
| }; |
| |
| // 23.20.2, primitive numerical output conversion |
| struct to_chars_result { |
| char* ptr; |
| errc ec; |
| }; |
| |
| to_chars_result to_chars(char* first, char* last, see below value, |
| int base = 10); |
| |
| to_chars_result to_chars(char* first, char* last, float value); |
| to_chars_result to_chars(char* first, char* last, double value); |
| to_chars_result to_chars(char* first, char* last, long double value); |
| |
| to_chars_result to_chars(char* first, char* last, float value, |
| chars_format fmt); |
| to_chars_result to_chars(char* first, char* last, double value, |
| chars_format fmt); |
| to_chars_result to_chars(char* first, char* last, long double value, |
| chars_format fmt); |
| |
| to_chars_result to_chars(char* first, char* last, float value, |
| chars_format fmt, int precision); |
| to_chars_result to_chars(char* first, char* last, double value, |
| chars_format fmt, int precision); |
| to_chars_result to_chars(char* first, char* last, long double value, |
| chars_format fmt, int precision); |
| |
| // 23.20.3, primitive numerical input conversion |
| struct from_chars_result { |
| const char* ptr; |
| errc ec; |
| }; |
| |
| from_chars_result from_chars(const char* first, const char* last, |
| see below& value, int base = 10); |
| |
| from_chars_result from_chars(const char* first, const char* last, |
| float& value, |
| chars_format fmt = chars_format::general); |
| from_chars_result from_chars(const char* first, const char* last, |
| double& value, |
| chars_format fmt = chars_format::general); |
| from_chars_result from_chars(const char* first, const char* last, |
| long double& value, |
| chars_format fmt = chars_format::general); |
| |
| } // namespace std |
| |
| */ |
| |
| #include <__errc> |
| #include <type_traits> |
| #include <limits> |
| #include <stdint.h> |
| #include <string.h> |
| #include <math.h> |
| |
| #include <__debug> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| namespace __itoa { |
| _LIBCPP_FUNC_VIS char* __u64toa(uint64_t __value, char* __buffer); |
| _LIBCPP_FUNC_VIS char* __u32toa(uint32_t __value, char* __buffer); |
| } |
| |
| #if _LIBCPP_STD_VER > 11 |
| |
| enum class _LIBCPP_ENUM_VIS chars_format |
| { |
| scientific = 0x1, |
| fixed = 0x2, |
| hex = 0x4, |
| general = fixed | scientific |
| }; |
| |
| struct _LIBCPP_TYPE_VIS to_chars_result |
| { |
| char* ptr; |
| errc ec; |
| }; |
| |
| struct _LIBCPP_TYPE_VIS from_chars_result |
| { |
| const char* ptr; |
| errc ec; |
| }; |
| |
| void to_chars(char*, char*, bool, int = 10) = delete; |
| void from_chars(const char*, const char*, bool, int = 10) = delete; |
| |
| namespace __itoa |
| { |
| |
| static constexpr uint64_t __pow10_64[] = { |
| UINT64_C(0), |
| UINT64_C(10), |
| UINT64_C(100), |
| UINT64_C(1000), |
| UINT64_C(10000), |
| UINT64_C(100000), |
| UINT64_C(1000000), |
| UINT64_C(10000000), |
| UINT64_C(100000000), |
| UINT64_C(1000000000), |
| UINT64_C(10000000000), |
| UINT64_C(100000000000), |
| UINT64_C(1000000000000), |
| UINT64_C(10000000000000), |
| UINT64_C(100000000000000), |
| UINT64_C(1000000000000000), |
| UINT64_C(10000000000000000), |
| UINT64_C(100000000000000000), |
| UINT64_C(1000000000000000000), |
| UINT64_C(10000000000000000000), |
| }; |
| |
| static constexpr uint32_t __pow10_32[] = { |
| UINT32_C(0), UINT32_C(10), UINT32_C(100), |
| UINT32_C(1000), UINT32_C(10000), UINT32_C(100000), |
| UINT32_C(1000000), UINT32_C(10000000), UINT32_C(100000000), |
| UINT32_C(1000000000), |
| }; |
| |
| template <typename _Tp, typename = void> |
| struct _LIBCPP_HIDDEN __traits_base |
| { |
| using type = uint64_t; |
| |
| #if !defined(_LIBCPP_COMPILER_MSVC) |
| static _LIBCPP_INLINE_VISIBILITY int __width(_Tp __v) |
| { |
| auto __t = (64 - __builtin_clzll(__v | 1)) * 1233 >> 12; |
| return __t - (__v < __pow10_64[__t]) + 1; |
| } |
| #endif |
| |
| static _LIBCPP_INLINE_VISIBILITY char* __convert(_Tp __v, char* __p) |
| { |
| return __u64toa(__v, __p); |
| } |
| |
| static _LIBCPP_INLINE_VISIBILITY auto& __pow() { return __pow10_64; } |
| }; |
| |
| template <typename _Tp> |
| struct _LIBCPP_HIDDEN |
| __traits_base<_Tp, decltype(void(uint32_t{declval<_Tp>()}))> |
| { |
| using type = uint32_t; |
| |
| #if !defined(_LIBCPP_COMPILER_MSVC) |
| static _LIBCPP_INLINE_VISIBILITY int __width(_Tp __v) |
| { |
| auto __t = (32 - __builtin_clz(__v | 1)) * 1233 >> 12; |
| return __t - (__v < __pow10_32[__t]) + 1; |
| } |
| #endif |
| |
| static _LIBCPP_INLINE_VISIBILITY char* __convert(_Tp __v, char* __p) |
| { |
| return __u32toa(__v, __p); |
| } |
| |
| static _LIBCPP_INLINE_VISIBILITY auto& __pow() { return __pow10_32; } |
| }; |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY bool |
| __mul_overflowed(unsigned char __a, _Tp __b, unsigned char& __r) |
| { |
| auto __c = __a * __b; |
| __r = __c; |
| return __c > (numeric_limits<unsigned char>::max)(); |
| } |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY bool |
| __mul_overflowed(unsigned short __a, _Tp __b, unsigned short& __r) |
| { |
| auto __c = __a * __b; |
| __r = __c; |
| return __c > (numeric_limits<unsigned short>::max)(); |
| } |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY bool |
| __mul_overflowed(_Tp __a, _Tp __b, _Tp& __r) |
| { |
| static_assert(is_unsigned<_Tp>::value, ""); |
| #if !defined(_LIBCPP_COMPILER_MSVC) |
| return __builtin_mul_overflow(__a, __b, &__r); |
| #else |
| bool __did = __b && ((numeric_limits<_Tp>::max)() / __b) < __a; |
| __r = __a * __b; |
| return __did; |
| #endif |
| } |
| |
| template <typename _Tp, typename _Up> |
| inline _LIBCPP_INLINE_VISIBILITY bool |
| __mul_overflowed(_Tp __a, _Up __b, _Tp& __r) |
| { |
| return __mul_overflowed(__a, static_cast<_Tp>(__b), __r); |
| } |
| |
| template <typename _Tp> |
| struct _LIBCPP_HIDDEN __traits : __traits_base<_Tp> |
| { |
| static constexpr int digits = numeric_limits<_Tp>::digits10 + 1; |
| using __traits_base<_Tp>::__pow; |
| using typename __traits_base<_Tp>::type; |
| |
| // precondition: at least one non-zero character available |
| static _LIBCPP_INLINE_VISIBILITY char const* |
| __read(char const* __p, char const* __ep, type& __a, type& __b) |
| { |
| type __cprod[digits]; |
| int __j = digits - 1; |
| int __i = digits; |
| do |
| { |
| if (!('0' <= *__p && *__p <= '9')) |
| break; |
| __cprod[--__i] = *__p++ - '0'; |
| } while (__p != __ep && __i != 0); |
| |
| __a = __inner_product(__cprod + __i + 1, __cprod + __j, __pow() + 1, |
| __cprod[__i]); |
| if (__mul_overflowed(__cprod[__j], __pow()[__j - __i], __b)) |
| --__p; |
| return __p; |
| } |
| |
| template <typename _It1, typename _It2, class _Up> |
| static _LIBCPP_INLINE_VISIBILITY _Up |
| __inner_product(_It1 __first1, _It1 __last1, _It2 __first2, _Up __init) |
| { |
| for (; __first1 < __last1; ++__first1, ++__first2) |
| __init = __init + *__first1 * *__first2; |
| return __init; |
| } |
| }; |
| |
| } // namespace __itoa |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY _Tp |
| __complement(_Tp __x) |
| { |
| static_assert(is_unsigned<_Tp>::value, "cast to unsigned first"); |
| return _Tp(~__x + 1); |
| } |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY auto |
| __to_unsigned(_Tp __x) |
| { |
| return static_cast<make_unsigned_t<_Tp>>(__x); |
| } |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY to_chars_result |
| __to_chars_itoa(char* __first, char* __last, _Tp __value, true_type) |
| { |
| auto __x = __to_unsigned(__value); |
| if (__value < 0 && __first != __last) |
| { |
| *__first++ = '-'; |
| __x = __complement(__x); |
| } |
| |
| return __to_chars_itoa(__first, __last, __x, false_type()); |
| } |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY to_chars_result |
| __to_chars_itoa(char* __first, char* __last, _Tp __value, false_type) |
| { |
| using __tx = __itoa::__traits<_Tp>; |
| auto __diff = __last - __first; |
| |
| #if !defined(_LIBCPP_COMPILER_MSVC) |
| if (__tx::digits <= __diff || __tx::__width(__value) <= __diff) |
| return {__tx::__convert(__value, __first), {}}; |
| else |
| return {__last, errc::value_too_large}; |
| #else |
| if (__tx::digits <= __diff) |
| return {__tx::__convert(__value, __first), {}}; |
| else |
| { |
| char __buf[__tx::digits]; |
| auto __p = __tx::__convert(__value, __buf); |
| auto __len = __p - __buf; |
| if (__len <= __diff) |
| { |
| memcpy(__first, __buf, __len); |
| return {__first + __len, {}}; |
| } |
| else |
| return {__last, errc::value_too_large}; |
| } |
| #endif |
| } |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY to_chars_result |
| __to_chars_integral(char* __first, char* __last, _Tp __value, int __base, |
| true_type) |
| { |
| auto __x = __to_unsigned(__value); |
| if (__value < 0 && __first != __last) |
| { |
| *__first++ = '-'; |
| __x = __complement(__x); |
| } |
| |
| return __to_chars_integral(__first, __last, __x, __base, false_type()); |
| } |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY to_chars_result |
| __to_chars_integral(char* __first, char* __last, _Tp __value, int __base, |
| false_type) |
| { |
| if (__base == 10) |
| return __to_chars_itoa(__first, __last, __value, false_type()); |
| |
| auto __p = __last; |
| while (__p != __first) |
| { |
| auto __c = __value % __base; |
| __value /= __base; |
| *--__p = "0123456789abcdefghijklmnopqrstuvwxyz"[__c]; |
| if (__value == 0) |
| break; |
| } |
| |
| auto __len = __last - __p; |
| if (__value != 0 || !__len) |
| return {__last, errc::value_too_large}; |
| else |
| { |
| memmove(__first, __p, __len); |
| return {__first + __len, {}}; |
| } |
| } |
| |
| template <typename _Tp, enable_if_t<is_integral<_Tp>::value, int> = 0> |
| inline _LIBCPP_INLINE_VISIBILITY to_chars_result |
| to_chars(char* __first, char* __last, _Tp __value) |
| { |
| return __to_chars_itoa(__first, __last, __value, is_signed<_Tp>()); |
| } |
| |
| template <typename _Tp, enable_if_t<is_integral<_Tp>::value, int> = 0> |
| inline _LIBCPP_INLINE_VISIBILITY to_chars_result |
| to_chars(char* __first, char* __last, _Tp __value, int __base) |
| { |
| _LIBCPP_ASSERT(2 <= __base && __base <= 36, "base not in [2, 36]"); |
| return __to_chars_integral(__first, __last, __value, __base, |
| is_signed<_Tp>()); |
| } |
| |
| template <typename _It, typename _Tp, typename _Fn, typename... _Ts> |
| inline _LIBCPP_INLINE_VISIBILITY from_chars_result |
| __sign_combinator(_It __first, _It __last, _Tp& __value, _Fn __f, _Ts... __args) |
| { |
| using __tl = numeric_limits<_Tp>; |
| decltype(__to_unsigned(__value)) __x; |
| |
| bool __neg = (__first != __last && *__first == '-'); |
| auto __r = __f(__neg ? __first + 1 : __first, __last, __x, __args...); |
| switch (__r.ec) |
| { |
| case errc::invalid_argument: |
| return {__first, __r.ec}; |
| case errc::result_out_of_range: |
| return __r; |
| default: |
| break; |
| } |
| |
| if (__neg) |
| { |
| if (__x <= __complement(__to_unsigned(__tl::min()))) |
| { |
| __x = __complement(__x); |
| memcpy(&__value, &__x, sizeof(__x)); |
| return __r; |
| } |
| } |
| else |
| { |
| if (__x <= (__tl::max)()) |
| { |
| __value = __x; |
| return __r; |
| } |
| } |
| |
| return {__r.ptr, errc::result_out_of_range}; |
| } |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY bool |
| __in_pattern(_Tp __c) |
| { |
| return '0' <= __c && __c <= '9'; |
| } |
| |
| struct _LIBCPP_HIDDEN __in_pattern_result |
| { |
| bool __ok; |
| int __val; |
| |
| explicit _LIBCPP_INLINE_VISIBILITY operator bool() const { return __ok; } |
| }; |
| |
| template <typename _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY __in_pattern_result |
| __in_pattern(_Tp __c, int __base) |
| { |
| if (__base <= 10) |
| return {'0' <= __c && __c < '0' + __base, __c - '0'}; |
| else if (__in_pattern(__c)) |
| return {true, __c - '0'}; |
| else if ('a' <= __c && __c < 'a' + __base - 10) |
| return {true, __c - 'a' + 10}; |
| else |
| return {'A' <= __c && __c < 'A' + __base - 10, __c - 'A' + 10}; |
| } |
| |
| template <typename _It, typename _Tp, typename _Fn, typename... _Ts> |
| inline _LIBCPP_INLINE_VISIBILITY from_chars_result |
| __subject_seq_combinator(_It __first, _It __last, _Tp& __value, _Fn __f, |
| _Ts... __args) |
| { |
| auto __find_non_zero = [](_It __first, _It __last) { |
| for (; __first != __last; ++__first) |
| if (*__first != '0') |
| break; |
| return __first; |
| }; |
| |
| auto __p = __find_non_zero(__first, __last); |
| if (__p == __last || !__in_pattern(*__p, __args...)) |
| { |
| if (__p == __first) |
| return {__first, errc::invalid_argument}; |
| else |
| { |
| __value = 0; |
| return {__p, {}}; |
| } |
| } |
| |
| auto __r = __f(__p, __last, __value, __args...); |
| if (__r.ec == errc::result_out_of_range) |
| { |
| for (; __r.ptr != __last; ++__r.ptr) |
| { |
| if (!__in_pattern(*__r.ptr, __args...)) |
| break; |
| } |
| } |
| |
| return __r; |
| } |
| |
| template <typename _Tp, enable_if_t<is_unsigned<_Tp>::value, int> = 0> |
| inline _LIBCPP_INLINE_VISIBILITY from_chars_result |
| __from_chars_atoi(const char* __first, const char* __last, _Tp& __value) |
| { |
| using __tx = __itoa::__traits<_Tp>; |
| using __output_type = typename __tx::type; |
| |
| return __subject_seq_combinator( |
| __first, __last, __value, |
| [](const char* __first, const char* __last, |
| _Tp& __value) -> from_chars_result { |
| __output_type __a, __b; |
| auto __p = __tx::__read(__first, __last, __a, __b); |
| if (__p == __last || !__in_pattern(*__p)) |
| { |
| __output_type __m = (numeric_limits<_Tp>::max)(); |
| if (__m >= __a && __m - __a >= __b) |
| { |
| __value = __a + __b; |
| return {__p, {}}; |
| } |
| } |
| return {__p, errc::result_out_of_range}; |
| }); |
| } |
| |
| template <typename _Tp, enable_if_t<is_signed<_Tp>::value, int> = 0> |
| inline _LIBCPP_INLINE_VISIBILITY from_chars_result |
| __from_chars_atoi(const char* __first, const char* __last, _Tp& __value) |
| { |
| using __t = decltype(__to_unsigned(__value)); |
| return __sign_combinator(__first, __last, __value, __from_chars_atoi<__t>); |
| } |
| |
| template <typename _Tp, enable_if_t<is_unsigned<_Tp>::value, int> = 0> |
| inline _LIBCPP_INLINE_VISIBILITY from_chars_result |
| __from_chars_integral(const char* __first, const char* __last, _Tp& __value, |
| int __base) |
| { |
| if (__base == 10) |
| return __from_chars_atoi(__first, __last, __value); |
| |
| return __subject_seq_combinator( |
| __first, __last, __value, |
| [](const char* __p, const char* __last, _Tp& __value, |
| int __base) -> from_chars_result { |
| using __tl = numeric_limits<_Tp>; |
| auto __digits = __tl::digits / log2f(float(__base)); |
| _Tp __a = __in_pattern(*__p++, __base).__val, __b = 0; |
| |
| for (int __i = 1; __p != __last; ++__i, ++__p) |
| { |
| if (auto __c = __in_pattern(*__p, __base)) |
| { |
| if (__i < __digits - 1) |
| __a = __a * __base + __c.__val; |
| else |
| { |
| if (!__itoa::__mul_overflowed(__a, __base, __a)) |
| ++__p; |
| __b = __c.__val; |
| break; |
| } |
| } |
| else |
| break; |
| } |
| |
| if (__p == __last || !__in_pattern(*__p, __base)) |
| { |
| if ((__tl::max)() - __a >= __b) |
| { |
| __value = __a + __b; |
| return {__p, {}}; |
| } |
| } |
| return {__p, errc::result_out_of_range}; |
| }, |
| __base); |
| } |
| |
| template <typename _Tp, enable_if_t<is_signed<_Tp>::value, int> = 0> |
| inline _LIBCPP_INLINE_VISIBILITY from_chars_result |
| __from_chars_integral(const char* __first, const char* __last, _Tp& __value, |
| int __base) |
| { |
| using __t = decltype(__to_unsigned(__value)); |
| return __sign_combinator(__first, __last, __value, |
| __from_chars_integral<__t>, __base); |
| } |
| |
| template <typename _Tp, enable_if_t<is_integral<_Tp>::value, int> = 0> |
| inline _LIBCPP_INLINE_VISIBILITY from_chars_result |
| from_chars(const char* __first, const char* __last, _Tp& __value) |
| { |
| return __from_chars_atoi(__first, __last, __value); |
| } |
| |
| template <typename _Tp, enable_if_t<is_integral<_Tp>::value, int> = 0> |
| inline _LIBCPP_INLINE_VISIBILITY from_chars_result |
| from_chars(const char* __first, const char* __last, _Tp& __value, int __base) |
| { |
| _LIBCPP_ASSERT(2 <= __base && __base <= 36, "base not in [2, 36]"); |
| return __from_chars_integral(__first, __last, __value, __base); |
| } |
| |
| #endif // _LIBCPP_STD_VER > 11 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP_CHARCONV |