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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Copyright 2018 Ulf Adams
// Copyright (c) Microsoft Corporation. All rights reserved.
// Boost Software License - Version 1.0 - August 17th, 2003
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#ifndef _LIBCPP_SRC_INCLUDE_RYU_RYU_H
#define _LIBCPP_SRC_INCLUDE_RYU_RYU_H
// Avoid formatting to keep the changes with the original code minimal.
// clang-format off
#include <__charconv/chars_format.h>
#include <__charconv/to_chars_result.h>
#include <__config>
#include <__system_error/errc.h>
#include <cstdint>
#include <cstring>
#include <type_traits>
#include "include/ryu/f2s.h"
#include "include/ryu/d2s.h"
#include "include/ryu/d2fixed.h"
#if defined(_MSC_VER)
#include <intrin.h> // for _umul128(), __shiftright128(), _BitScanForward{,64}
#endif // defined(_MSC_VER)
#if defined(_WIN64) || defined(_M_AMD64) || defined(__x86_64__) || defined(__aarch64__)
#define _LIBCPP_64_BIT
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
// https://github.com/ulfjack/ryu/tree/59661c3/ryu
#if !defined(_MSC_VER)
_LIBCPP_HIDE_FROM_ABI inline unsigned char _BitScanForward64(unsigned long* __index, unsigned long long __mask) {
if (__mask == 0) {
return false;
}
*__index = __builtin_ctzll(__mask);
return true;
}
_LIBCPP_HIDE_FROM_ABI inline unsigned char _BitScanForward(unsigned long* __index, unsigned int __mask) {
if (__mask == 0) {
return false;
}
*__index = __builtin_ctz(__mask);
return true;
}
#endif // !_MSC_VER
template <class _Floating>
[[nodiscard]] to_chars_result _Floating_to_chars_ryu(
char* const _First, char* const _Last, const _Floating _Value, const chars_format _Fmt) noexcept {
if constexpr (_IsSame<_Floating, float>::value) {
return __f2s_buffered_n(_First, _Last, _Value, _Fmt);
} else {
return __d2s_buffered_n(_First, _Last, _Value, _Fmt);
}
}
template <class _Floating>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI to_chars_result _Floating_to_chars_scientific_precision(
char* const _First, char* const _Last, const _Floating _Value, int _Precision) noexcept {
// C11 7.21.6.1 "The fprintf function"/5:
// "A negative precision argument is taken as if the precision were omitted."
// /8: "e,E [...] if the precision is missing, it is taken as 6"
if (_Precision < 0) {
_Precision = 6;
} else if (_Precision < 1'000'000'000) { // Match ' to fix compilation with GCC in C++11 mode
// _Precision is ok.
} else {
// Avoid integer overflow.
// (This defensive check is slightly nonconformant; it can be carefully improved in the future.)
return {_Last, errc::value_too_large};
}
return __d2exp_buffered_n(_First, _Last, _Value, static_cast<uint32_t>(_Precision));
}
template <class _Floating>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI to_chars_result _Floating_to_chars_fixed_precision(
char* const _First, char* const _Last, const _Floating _Value, int _Precision) noexcept {
// C11 7.21.6.1 "The fprintf function"/5:
// "A negative precision argument is taken as if the precision were omitted."
// /8: "f,F [...] If the precision is missing, it is taken as 6"
if (_Precision < 0) {
_Precision = 6;
} else if (_Precision < 1'000'000'000) { // Match ' to fix compilation with GCC in C++11 mode
// _Precision is ok.
} else {
// Avoid integer overflow.
// (This defensive check is slightly nonconformant; it can be carefully improved in the future.)
return {_Last, errc::value_too_large};
}
return __d2fixed_buffered_n(_First, _Last, _Value, static_cast<uint32_t>(_Precision));
}
#undef _LIBCPP_64_BIT
#undef _LIBCPP_INTRINSIC128
_LIBCPP_END_NAMESPACE_STD
// clang-format on
#endif // _LIBCPP_SRC_INCLUDE_RYU_RYU_H
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