// -*- 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 <__debug>

#include <__errc>

#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);

    }

}

Unexecuted instantiation: std::__1::to_chars_result std::__1::_Floating_to_chars_ryu<float>(char*, char*, float, std::__1::chars_format)

Unexecuted instantiation: std::__1::to_chars_result std::__1::_Floating_to_chars_ryu<double>(char*, char*, double, std::__1::chars_format)

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));

}

Unexecuted instantiation: std::__1::to_chars_result std::__1::_Floating_to_chars_scientific_precision<float>(char*, char*, float, int)

Unexecuted instantiation: std::__1::to_chars_result std::__1::_Floating_to_chars_scientific_precision<double>(char*, char*, double, int)

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));

}

Unexecuted instantiation: std::__1::to_chars_result std::__1::_Floating_to_chars_fixed_precision<float>(char*, char*, float, int)

Unexecuted instantiation: std::__1::to_chars_result std::__1::_Floating_to_chars_fixed_precision<double>(char*, char*, double, int)

#undef _LIBCPP_64_BIT

#undef _LIBCPP_INTRINSIC128

_LIBCPP_END_NAMESPACE_STD

// clang-format on

#endif // _LIBCPP_SRC_INCLUDE_RYU_RYU_H