85a7095950
Signed-off-by: Jonathan Wakely <jwakely@redhat.com> libstdc++-v3/ChangeLog: PR libstdc++/101965 * include/std/charconv (__to_chars_i): Remove redundant check.
735 lines
19 KiB
C++
735 lines
19 KiB
C++
// Primitive numeric conversions (to_chars and from_chars) -*- C++ -*-
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// Copyright (C) 2017-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file include/charconv
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_CHARCONV
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#define _GLIBCXX_CHARCONV 1
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#pragma GCC system_header
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// As an extension we support <charconv> in C++14, but this header should not
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// be included by any other library headers in C++14 mode. This ensures that
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// the names defined in this header are not added to namespace std unless a
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// user explicitly includes <charconv> in C++14 code.
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#if __cplusplus >= 201402L
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#include <type_traits>
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#include <bit> // for __bit_width
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#include <cctype> // for isdigit
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#include <bits/charconv.h> // for __to_chars_len, __to_chars_10_impl
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#include <bits/error_constants.h> // for std::errc
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#include <ext/numeric_traits.h>
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#if _GLIBCXX_HAVE_USELOCALE
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# define __cpp_lib_to_chars 201611L
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#endif
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/// Result type of std::to_chars
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struct to_chars_result
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{
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char* ptr;
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errc ec;
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#if __cplusplus > 201703L && __cpp_impl_three_way_comparison >= 201907L
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friend bool
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operator==(const to_chars_result&, const to_chars_result&) = default;
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#endif
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};
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/// Result type of std::from_chars
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struct from_chars_result
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{
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const char* ptr;
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errc ec;
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#if __cplusplus > 201703L && __cpp_impl_three_way_comparison >= 201907L
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friend bool
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operator==(const from_chars_result&, const from_chars_result&) = default;
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#endif
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};
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namespace __detail
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{
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template<typename _Tp>
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using __integer_to_chars_result_type
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= enable_if_t<__or_<__is_signed_integer<_Tp>,
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__is_unsigned_integer<_Tp>,
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is_same<char, remove_cv_t<_Tp>>>::value,
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to_chars_result>;
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// Pick an unsigned type of suitable size. This is used to reduce the
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// number of specializations of __to_chars_len, __to_chars etc. that
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// get instantiated. For example, to_chars<char> and to_chars<short>
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// and to_chars<unsigned> will all use the same code, and so will
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// to_chars<long> when sizeof(int) == sizeof(long).
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template<typename _Tp>
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struct __to_chars_unsigned_type : __make_unsigned_selector_base
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{
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using _UInts = _List<unsigned int, unsigned long, unsigned long long
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#if __SIZEOF_INT128__ > __SIZEOF_LONG_LONG__
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, unsigned __int128
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#endif
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>;
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using type = typename __select<sizeof(_Tp), _UInts>::__type;
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};
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template<typename _Tp>
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using __unsigned_least_t = typename __to_chars_unsigned_type<_Tp>::type;
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// Generic implementation for arbitrary bases.
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// Defined in <bits/charconv.h>.
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template<typename _Tp>
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constexpr unsigned
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__to_chars_len(_Tp __value, int __base /* = 10 */) noexcept;
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template<typename _Tp>
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constexpr unsigned
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__to_chars_len_2(_Tp __value) noexcept
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{ return std::__bit_width(__value); }
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// Generic implementation for arbitrary bases.
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template<typename _Tp>
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to_chars_result
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__to_chars(char* __first, char* __last, _Tp __val, int __base) noexcept
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{
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static_assert(is_integral<_Tp>::value, "implementation bug");
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static_assert(is_unsigned<_Tp>::value, "implementation bug");
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to_chars_result __res;
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const unsigned __len = __to_chars_len(__val, __base);
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if (__builtin_expect((__last - __first) < __len, 0))
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{
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__res.ptr = __last;
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__res.ec = errc::value_too_large;
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return __res;
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}
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unsigned __pos = __len - 1;
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static constexpr char __digits[] = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
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'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
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'u', 'v', 'w', 'x', 'y', 'z'
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};
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while (__val >= (unsigned)__base)
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{
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auto const __quo = __val / __base;
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auto const __rem = __val % __base;
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__first[__pos--] = __digits[__rem];
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__val = __quo;
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}
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*__first = __digits[__val];
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__res.ptr = __first + __len;
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__res.ec = {};
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return __res;
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}
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template<typename _Tp>
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__integer_to_chars_result_type<_Tp>
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__to_chars_16(char* __first, char* __last, _Tp __val) noexcept
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{
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static_assert(is_integral<_Tp>::value, "implementation bug");
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static_assert(is_unsigned<_Tp>::value, "implementation bug");
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to_chars_result __res;
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const unsigned __len = (__to_chars_len_2(__val) + 3) / 4;
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if (__builtin_expect((__last - __first) < __len, 0))
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{
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__res.ptr = __last;
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__res.ec = errc::value_too_large;
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return __res;
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}
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static constexpr char __digits[] = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'a', 'b', 'c', 'd', 'e', 'f'
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};
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unsigned __pos = __len - 1;
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while (__val >= 0x100)
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{
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auto __num = __val & 0xF;
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__val >>= 4;
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__first[__pos] = __digits[__num];
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__num = __val & 0xF;
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__val >>= 4;
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__first[__pos - 1] = __digits[__num];
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__pos -= 2;
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}
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if (__val >= 0x10)
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{
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const auto __num = __val & 0xF;
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__val >>= 4;
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__first[1] = __digits[__num];
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__first[0] = __digits[__val];
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}
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else
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__first[0] = __digits[__val];
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__res.ptr = __first + __len;
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__res.ec = {};
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return __res;
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}
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template<typename _Tp>
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inline __integer_to_chars_result_type<_Tp>
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__to_chars_10(char* __first, char* __last, _Tp __val) noexcept
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{
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static_assert(is_integral<_Tp>::value, "implementation bug");
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static_assert(is_unsigned<_Tp>::value, "implementation bug");
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to_chars_result __res;
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const unsigned __len = __to_chars_len(__val, 10);
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if (__builtin_expect((__last - __first) < __len, 0))
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{
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__res.ptr = __last;
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__res.ec = errc::value_too_large;
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return __res;
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}
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__detail::__to_chars_10_impl(__first, __len, __val);
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__res.ptr = __first + __len;
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__res.ec = {};
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return __res;
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}
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template<typename _Tp>
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__integer_to_chars_result_type<_Tp>
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__to_chars_8(char* __first, char* __last, _Tp __val) noexcept
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{
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static_assert(is_integral<_Tp>::value, "implementation bug");
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static_assert(is_unsigned<_Tp>::value, "implementation bug");
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to_chars_result __res;
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unsigned __len;
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if _GLIBCXX17_CONSTEXPR (__gnu_cxx::__int_traits<_Tp>::__digits <= 16)
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{
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__len = __val > 077777u ? 6u
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: __val > 07777u ? 5u
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: __val > 0777u ? 4u
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: __val > 077u ? 3u
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: __val > 07u ? 2u
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: 1u;
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}
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else
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__len = (__to_chars_len_2(__val) + 2) / 3;
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if (__builtin_expect((__last - __first) < __len, 0))
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{
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__res.ptr = __last;
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__res.ec = errc::value_too_large;
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return __res;
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}
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unsigned __pos = __len - 1;
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while (__val >= 0100)
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{
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auto __num = __val & 7;
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__val >>= 3;
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__first[__pos] = '0' + __num;
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__num = __val & 7;
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__val >>= 3;
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__first[__pos - 1] = '0' + __num;
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__pos -= 2;
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}
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if (__val >= 010)
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{
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auto const __num = __val & 7;
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__val >>= 3;
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__first[1] = '0' + __num;
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__first[0] = '0' + __val;
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}
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else
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__first[0] = '0' + __val;
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__res.ptr = __first + __len;
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__res.ec = {};
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return __res;
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}
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template<typename _Tp>
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__integer_to_chars_result_type<_Tp>
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__to_chars_2(char* __first, char* __last, _Tp __val) noexcept
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{
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static_assert(is_integral<_Tp>::value, "implementation bug");
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static_assert(is_unsigned<_Tp>::value, "implementation bug");
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to_chars_result __res;
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const unsigned __len = __to_chars_len_2(__val);
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if (__builtin_expect((__last - __first) < __len, 0))
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{
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__res.ptr = __last;
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__res.ec = errc::value_too_large;
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return __res;
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}
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unsigned __pos = __len - 1;
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while (__pos)
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{
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__first[__pos--] = '0' + (__val & 1);
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__val >>= 1;
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}
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// First digit is always '1' because __to_chars_len_2 skips
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// leading zero bits and std::to_chars handles zero values
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// directly.
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__first[0] = '1';
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__res.ptr = __first + __len;
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__res.ec = {};
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return __res;
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}
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} // namespace __detail
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template<typename _Tp>
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__detail::__integer_to_chars_result_type<_Tp>
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__to_chars_i(char* __first, char* __last, _Tp __value, int __base = 10)
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{
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__glibcxx_assert(2 <= __base && __base <= 36);
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using _Up = __detail::__unsigned_least_t<_Tp>;
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_Up __unsigned_val = __value;
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if (__first == __last) [[__unlikely__]]
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return { __last, errc::value_too_large };
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if (__value == 0)
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{
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*__first = '0';
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return { __first + 1, errc{} };
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}
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else if _GLIBCXX17_CONSTEXPR (std::is_signed<_Tp>::value)
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if (__value < 0)
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{
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*__first++ = '-';
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__unsigned_val = _Up(~__value) + _Up(1);
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}
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switch (__base)
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{
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case 16:
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return __detail::__to_chars_16(__first, __last, __unsigned_val);
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case 10:
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return __detail::__to_chars_10(__first, __last, __unsigned_val);
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case 8:
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return __detail::__to_chars_8(__first, __last, __unsigned_val);
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case 2:
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return __detail::__to_chars_2(__first, __last, __unsigned_val);
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default:
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return __detail::__to_chars(__first, __last, __unsigned_val, __base);
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}
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}
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#define _GLIBCXX_TO_CHARS(T) \
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inline to_chars_result \
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to_chars(char* __first, char* __last, T __value, int __base = 10) \
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{ return std::__to_chars_i<T>(__first, __last, __value, __base); }
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_GLIBCXX_TO_CHARS(char)
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_GLIBCXX_TO_CHARS(signed char)
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_GLIBCXX_TO_CHARS(unsigned char)
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_GLIBCXX_TO_CHARS(signed short)
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_GLIBCXX_TO_CHARS(unsigned short)
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_GLIBCXX_TO_CHARS(signed int)
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_GLIBCXX_TO_CHARS(unsigned int)
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_GLIBCXX_TO_CHARS(signed long)
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_GLIBCXX_TO_CHARS(unsigned long)
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_GLIBCXX_TO_CHARS(signed long long)
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_GLIBCXX_TO_CHARS(unsigned long long)
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#if defined(__GLIBCXX_TYPE_INT_N_0)
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_GLIBCXX_TO_CHARS(signed __GLIBCXX_TYPE_INT_N_0)
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_GLIBCXX_TO_CHARS(unsigned __GLIBCXX_TYPE_INT_N_0)
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_1)
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_GLIBCXX_TO_CHARS(signed __GLIBCXX_TYPE_INT_N_1)
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_GLIBCXX_TO_CHARS(unsigned __GLIBCXX_TYPE_INT_N_1)
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_2)
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_GLIBCXX_TO_CHARS(signed __GLIBCXX_TYPE_INT_N_2)
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_GLIBCXX_TO_CHARS(unsigned __GLIBCXX_TYPE_INT_N_2)
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_3)
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_GLIBCXX_TO_CHARS(signed __GLIBCXX_TYPE_INT_N_3)
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_GLIBCXX_TO_CHARS(unsigned __GLIBCXX_TYPE_INT_N_3)
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#endif
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#undef _GLIBCXX_TO_CHARS
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 3266. to_chars(bool) should be deleted
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to_chars_result to_chars(char*, char*, bool, int = 10) = delete;
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namespace __detail
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{
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template<typename _Tp>
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bool
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__raise_and_add(_Tp& __val, int __base, unsigned char __c)
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{
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if (__builtin_mul_overflow(__val, __base, &__val)
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|| __builtin_add_overflow(__val, __c, &__val))
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return false;
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return true;
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}
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/// std::from_chars implementation for integers in base 2.
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template<typename _Tp>
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bool
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__from_chars_binary(const char*& __first, const char* __last, _Tp& __val)
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{
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static_assert(is_integral<_Tp>::value, "implementation bug");
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static_assert(is_unsigned<_Tp>::value, "implementation bug");
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const ptrdiff_t __len = __last - __first;
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ptrdiff_t __i = 0;
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while (__i < __len && __first[__i] == '0')
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++__i;
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const ptrdiff_t __leading_zeroes = __i;
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while (__i < __len)
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{
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const unsigned char __c = (unsigned)__first[__i] - '0';
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if (__c < 2)
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__val = (__val << 1) | __c;
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else
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break;
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__i++;
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}
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__first += __i;
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return (__i - __leading_zeroes) <= __gnu_cxx::__int_traits<_Tp>::__digits;
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}
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/// std::from_chars implementation for integers in bases 3 to 10.
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template<typename _Tp>
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bool
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__from_chars_digit(const char*& __first, const char* __last, _Tp& __val,
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int __base)
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{
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static_assert(is_integral<_Tp>::value, "implementation bug");
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static_assert(is_unsigned<_Tp>::value, "implementation bug");
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auto __matches = [__base](char __c) {
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return '0' <= __c && __c <= ('0' + (__base - 1));
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};
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while (__first != __last)
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{
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const char __c = *__first;
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if (__matches(__c))
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{
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if (!__raise_and_add(__val, __base, __c - '0'))
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{
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while (++__first != __last && __matches(*__first))
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;
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return false;
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}
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__first++;
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}
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else
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return true;
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}
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return true;
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}
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constexpr unsigned char
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__from_chars_alpha_to_num(char __c)
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{
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switch (__c)
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{
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case 'a':
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case 'A':
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return 10;
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case 'b':
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case 'B':
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return 11;
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case 'c':
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case 'C':
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return 12;
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case 'd':
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case 'D':
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return 13;
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case 'e':
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case 'E':
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return 14;
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case 'f':
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case 'F':
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return 15;
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case 'g':
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case 'G':
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return 16;
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case 'h':
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case 'H':
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return 17;
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case 'i':
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case 'I':
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return 18;
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case 'j':
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case 'J':
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return 19;
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case 'k':
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case 'K':
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return 20;
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|
case 'l':
|
|
case 'L':
|
|
return 21;
|
|
case 'm':
|
|
case 'M':
|
|
return 22;
|
|
case 'n':
|
|
case 'N':
|
|
return 23;
|
|
case 'o':
|
|
case 'O':
|
|
return 24;
|
|
case 'p':
|
|
case 'P':
|
|
return 25;
|
|
case 'q':
|
|
case 'Q':
|
|
return 26;
|
|
case 'r':
|
|
case 'R':
|
|
return 27;
|
|
case 's':
|
|
case 'S':
|
|
return 28;
|
|
case 't':
|
|
case 'T':
|
|
return 29;
|
|
case 'u':
|
|
case 'U':
|
|
return 30;
|
|
case 'v':
|
|
case 'V':
|
|
return 31;
|
|
case 'w':
|
|
case 'W':
|
|
return 32;
|
|
case 'x':
|
|
case 'X':
|
|
return 33;
|
|
case 'y':
|
|
case 'Y':
|
|
return 34;
|
|
case 'z':
|
|
case 'Z':
|
|
return 35;
|
|
}
|
|
return __gnu_cxx::__int_traits<unsigned char>::__max;
|
|
}
|
|
|
|
/// std::from_chars implementation for integers in bases 11 to 26.
|
|
template<typename _Tp>
|
|
bool
|
|
__from_chars_alnum(const char*& __first, const char* __last, _Tp& __val,
|
|
int __base)
|
|
{
|
|
bool __valid = true;
|
|
while (__first != __last)
|
|
{
|
|
unsigned char __c = *__first;
|
|
if (std::isdigit(__c))
|
|
__c -= '0';
|
|
else
|
|
{
|
|
__c = __from_chars_alpha_to_num(__c);
|
|
if (__c >= __base)
|
|
break;
|
|
}
|
|
|
|
if (__builtin_expect(__valid, 1))
|
|
__valid = __raise_and_add(__val, __base, __c);
|
|
__first++;
|
|
}
|
|
return __valid;
|
|
}
|
|
|
|
template<typename _Tp>
|
|
using __integer_from_chars_result_type
|
|
= enable_if_t<__or_<__is_signed_integer<_Tp>,
|
|
__is_unsigned_integer<_Tp>,
|
|
is_same<char, remove_cv_t<_Tp>>>::value,
|
|
from_chars_result>;
|
|
|
|
} // namespace __detail
|
|
|
|
/// std::from_chars for integral types.
|
|
template<typename _Tp>
|
|
__detail::__integer_from_chars_result_type<_Tp>
|
|
from_chars(const char* __first, const char* __last, _Tp& __value,
|
|
int __base = 10)
|
|
{
|
|
__glibcxx_assert(2 <= __base && __base <= 36);
|
|
|
|
from_chars_result __res{__first, {}};
|
|
|
|
int __sign = 1;
|
|
if _GLIBCXX17_CONSTEXPR (std::is_signed<_Tp>::value)
|
|
if (__first != __last && *__first == '-')
|
|
{
|
|
__sign = -1;
|
|
++__first;
|
|
}
|
|
|
|
using _Up = __detail::__unsigned_least_t<_Tp>;
|
|
_Up __val = 0;
|
|
|
|
const auto __start = __first;
|
|
bool __valid;
|
|
if (__base == 2)
|
|
__valid = __detail::__from_chars_binary(__first, __last, __val);
|
|
else if (__base <= 10)
|
|
__valid = __detail::__from_chars_digit(__first, __last, __val, __base);
|
|
else
|
|
__valid = __detail::__from_chars_alnum(__first, __last, __val, __base);
|
|
|
|
if (__builtin_expect(__first == __start, 0))
|
|
__res.ec = errc::invalid_argument;
|
|
else
|
|
{
|
|
__res.ptr = __first;
|
|
if (!__valid)
|
|
__res.ec = errc::result_out_of_range;
|
|
else
|
|
{
|
|
if _GLIBCXX17_CONSTEXPR (std::is_signed<_Tp>::value)
|
|
{
|
|
_Tp __tmp;
|
|
if (__builtin_mul_overflow(__val, __sign, &__tmp))
|
|
__res.ec = errc::result_out_of_range;
|
|
else
|
|
__value = __tmp;
|
|
}
|
|
else
|
|
{
|
|
if _GLIBCXX17_CONSTEXPR (__gnu_cxx::__int_traits<_Up>::__max
|
|
> __gnu_cxx::__int_traits<_Tp>::__max)
|
|
{
|
|
if (__val > __gnu_cxx::__int_traits<_Tp>::__max)
|
|
__res.ec = errc::result_out_of_range;
|
|
else
|
|
__value = __val;
|
|
}
|
|
else
|
|
__value = __val;
|
|
}
|
|
}
|
|
}
|
|
return __res;
|
|
}
|
|
|
|
/// floating-point format for primitive numerical conversion
|
|
enum class chars_format
|
|
{
|
|
scientific = 1, fixed = 2, hex = 4, general = fixed | scientific
|
|
};
|
|
|
|
constexpr chars_format
|
|
operator|(chars_format __lhs, chars_format __rhs) noexcept
|
|
{ return (chars_format)((unsigned)__lhs | (unsigned)__rhs); }
|
|
|
|
constexpr chars_format
|
|
operator&(chars_format __lhs, chars_format __rhs) noexcept
|
|
{ return (chars_format)((unsigned)__lhs & (unsigned)__rhs); }
|
|
|
|
constexpr chars_format
|
|
operator^(chars_format __lhs, chars_format __rhs) noexcept
|
|
{ return (chars_format)((unsigned)__lhs ^ (unsigned)__rhs); }
|
|
|
|
constexpr chars_format
|
|
operator~(chars_format __fmt) noexcept
|
|
{ return (chars_format)~(unsigned)__fmt; }
|
|
|
|
constexpr chars_format&
|
|
operator|=(chars_format& __lhs, chars_format __rhs) noexcept
|
|
{ return __lhs = __lhs | __rhs; }
|
|
|
|
constexpr chars_format&
|
|
operator&=(chars_format& __lhs, chars_format __rhs) noexcept
|
|
{ return __lhs = __lhs & __rhs; }
|
|
|
|
constexpr chars_format&
|
|
operator^=(chars_format& __lhs, chars_format __rhs) noexcept
|
|
{ return __lhs = __lhs ^ __rhs; }
|
|
|
|
#if _GLIBCXX_HAVE_USELOCALE
|
|
from_chars_result
|
|
from_chars(const char* __first, const char* __last, float& __value,
|
|
chars_format __fmt = chars_format::general) noexcept;
|
|
|
|
from_chars_result
|
|
from_chars(const char* __first, const char* __last, double& __value,
|
|
chars_format __fmt = chars_format::general) noexcept;
|
|
|
|
from_chars_result
|
|
from_chars(const char* __first, const char* __last, long double& __value,
|
|
chars_format __fmt = chars_format::general) noexcept;
|
|
#endif
|
|
|
|
#if _GLIBCXX_FLOAT_IS_IEEE_BINARY32 && _GLIBCXX_DOUBLE_IS_IEEE_BINARY64 \
|
|
&& __SIZE_WIDTH__ >= 32
|
|
// Floating-point std::to_chars
|
|
|
|
// Overloads for float.
|
|
to_chars_result to_chars(char* __first, char* __last, float __value) noexcept;
|
|
to_chars_result to_chars(char* __first, char* __last, float __value,
|
|
chars_format __fmt) noexcept;
|
|
to_chars_result to_chars(char* __first, char* __last, float __value,
|
|
chars_format __fmt, int __precision) noexcept;
|
|
|
|
// Overloads for double.
|
|
to_chars_result to_chars(char* __first, char* __last, double __value) noexcept;
|
|
to_chars_result to_chars(char* __first, char* __last, double __value,
|
|
chars_format __fmt) noexcept;
|
|
to_chars_result to_chars(char* __first, char* __last, double __value,
|
|
chars_format __fmt, int __precision) noexcept;
|
|
|
|
// Overloads for long double.
|
|
to_chars_result to_chars(char* __first, char* __last, long double __value)
|
|
noexcept;
|
|
to_chars_result to_chars(char* __first, char* __last, long double __value,
|
|
chars_format __fmt) noexcept;
|
|
to_chars_result to_chars(char* __first, char* __last, long double __value,
|
|
chars_format __fmt, int __precision) noexcept;
|
|
#endif
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
#endif // C++14
|
|
#endif // _GLIBCXX_CHARCONV
|