STL/stl/inc/print

// print standard header

// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#ifndef _PRINT_
#define _PRINT_
#include <yvals_core.h>
#if _STL_COMPILER_PREPROCESSOR
#ifndef __cpp_lib_print
_EMIT_STL_WARNING(STL4038, "The contents of <print> are available only with C++23 or later.");
#else // ^^^ !defined(__cpp_lib_print) / defined(__cpp_lib_print) vvv

#include <__msvc_print.hpp>
#include <cstdio>
#include <format>

#pragma pack(push, _CRT_PACKING)
#pragma warning(push, _STL_WARNING_LEVEL)
#pragma warning(disable : _STL_DISABLED_WARNINGS)
_STL_DISABLE_CLANG_WARNINGS
#pragma push_macro("new")
#undef new

_STD_BEGIN

inline void _Print_noformat_nonunicode(FILE* const _Stream, const string_view _Str) {
    const bool _Was_write_successful = _CSTD fwrite(_Str.data(), 1, _Str.size(), _Stream) == _Str.size();

    if (!_Was_write_successful) [[unlikely]] {
        _Throw_system_error(static_cast<errc>(errno));
    }
}

inline void _Vprint_nonunicode_impl(
    const _Add_newline _Add_nl, FILE* const _Stream, const string_view _Fmt_str, const format_args _Fmt_args) {
    string _Output_str = _STD vformat(_Fmt_str, _Fmt_args);
    if (_Add_nl == _Add_newline::_Yes) {
        _Output_str.push_back('\n');
    }

    _STD _Print_noformat_nonunicode(_Stream, _Output_str);
}

inline void _Print_noformat_unicode(FILE* const _Stream, const string_view _Str) {
    const __std_unicode_console_retrieval_result _Unicode_console_retrieval_result{
        __std_get_unicode_console_handle_from_file_stream(_Stream)};

    // See the documentation for __std_unicode_console_retrieval_result to understand why we do this.
    bool _Is_unicode_console;

#pragma warning(push)
#pragma warning(disable : 4061) // enumerator not explicitly handled by switch label
    switch (_Unicode_console_retrieval_result._Error) {
    case __std_win_error::_Success:
        _Is_unicode_console = true;
        break;

    case __std_win_error::_File_not_found:
        _Is_unicode_console = false;
        break;

    case __std_win_error::_Not_supported:
        [[unlikely]] return;

    default:
        [[unlikely]] _STD _Throw_system_error_from_std_win_error(_Unicode_console_retrieval_result._Error);
    }
#pragma warning(pop)

    if (_Is_unicode_console) {
        const bool _Was_flush_successful = _CSTD fflush(_Stream) == 0;
        if (!_Was_flush_successful) [[unlikely]] {
            _Throw_system_error(static_cast<errc>(errno));
        }

        const __std_win_error _Console_print_result =
            __std_print_to_unicode_console(_Unicode_console_retrieval_result._Console_handle, _Str.data(), _Str.size());
        if (_Console_print_result != __std_win_error::_Success) [[unlikely]] {
            _STD _Throw_system_error_from_std_win_error(_Console_print_result);
        }
    } else {
        _STD _Print_noformat_nonunicode(_Stream, _Str);
    }
}

inline void _Vprint_unicode_impl(
    const _Add_newline _Add_nl, FILE* const _Stream, const string_view _Fmt_str, const format_args _Fmt_args) {
    string _Output_str = _STD vformat(_Fmt_str, _Fmt_args);
    if (_Add_nl == _Add_newline::_Yes) {
        _Output_str.push_back('\n');
    }

    _STD _Print_noformat_unicode(_Stream, _Output_str);
}

template <class... _Types>
void _Print_impl(
    const _Add_newline _Add_nl, FILE* const _Stream, const format_string<_Types...> _Fmt, _Types&&... _Args) {
    constexpr bool _Has_format_args = sizeof...(_Types) > 0;

    if constexpr (_Has_format_args) {
        if constexpr (_STD _Is_ordinary_literal_encoding_utf8()) {
            _STD _Vprint_unicode_impl(_Add_nl, _Stream, _Fmt.get(), _STD make_format_args(_Args...));
        } else {
            _STD _Vprint_nonunicode_impl(_Add_nl, _Stream, _Fmt.get(), _STD make_format_args(_Args...));
        }
    } else {
        const string _Unescaped_str{_Unescape_braces(_Add_nl, _Fmt.get())};

        if constexpr (_STD _Is_ordinary_literal_encoding_utf8()) {
            _STD _Print_noformat_unicode(_Stream, _Unescaped_str);
        } else {
            _STD _Print_noformat_nonunicode(_Stream, _Unescaped_str);
        }
    }
}

_EXPORT_STD template <class... _Types>
void print(FILE* const _Stream, const format_string<_Types...> _Fmt, _Types&&... _Args) {
    _STD _Print_impl(_Add_newline::_Nope, _Stream, _Fmt, _STD forward<_Types>(_Args)...);
}

_EXPORT_STD template <class... _Types>
void print(const format_string<_Types...> _Fmt, _Types&&... _Args) {
    _STD print(stdout, _Fmt, _STD forward<_Types>(_Args)...);
}

_EXPORT_STD template <class... _Types>
void println(FILE* const _Stream, const format_string<_Types...> _Fmt, _Types&&... _Args) {
    _STD _Print_impl(_Add_newline::_Yes, _Stream, _Fmt, _STD forward<_Types>(_Args)...);
}

_EXPORT_STD template <class... _Types>
void println(const format_string<_Types...> _Fmt, _Types&&... _Args) {
    _STD println(stdout, _Fmt, _STD forward<_Types>(_Args)...);
}

_EXPORT_STD template <int = 0> // improves throughput, see GH-2329
void vprint_unicode(FILE* const _Stream, const string_view _Fmt_str, const format_args _Fmt_args) {
    _STD _Vprint_unicode_impl(_Add_newline::_Nope, _Stream, _Fmt_str, _Fmt_args);
}

_EXPORT_STD template <int = 0> // improves throughput, see GH-2329
void vprint_unicode(const string_view _Fmt_str, const format_args _Fmt_args) {
    _STD vprint_unicode(stdout, _Fmt_str, _Fmt_args);
}

_EXPORT_STD template <int = 0> // improves throughput, see GH-2329
void vprint_nonunicode(FILE* const _Stream, const string_view _Fmt_str, const format_args _Fmt_args) {
    _STD _Vprint_nonunicode_impl(_Add_newline::_Nope, _Stream, _Fmt_str, _Fmt_args);
}

_EXPORT_STD template <int = 0> // improves throughput, see GH-2329
void vprint_nonunicode(const string_view _Fmt_str, const format_args _Fmt_args) {
    _STD vprint_nonunicode(stdout, _Fmt_str, _Fmt_args);
}

_STD_END

#pragma pop_macro("new")
_STL_RESTORE_CLANG_WARNINGS
#pragma warning(pop)
#pragma pack(pop)

#endif // ^^^ defined(__cpp_lib_print) ^^^
#endif // _STL_COMPILER_PREPROCESSOR
#endif // _PRINT_