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7e7013c5d4
This change implements the C library dependent portions of P0482R6 (char8_t: A type for UTF-8 characters and strings (Revision 6)) by declaring std::c8rtomb() and std::mbrtoc8() in the <cuchar> header when implementations are provided by the C library as specified by WG14 N2653 (char8_t: A type for UTF-8 characters and strings (Revision 1)) as adopted for C23. A _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 macro is defined by the libc++ __config header unless it is known that the C library provides these functions in the current compilation mode. This macro is used for testing purposes and may be of use to libc++ users. At present, the only C library known to implement these functions is GNU libc as of its 2.36 release. Reviewed By: ldionne Differential Revision: https://reviews.llvm.org/D130946
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_UCHAR_H
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#define _LIBCPP_UCHAR_H
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/*
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uchar.h synopsis // since C++11
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Macros:
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__STDC_UTF_16__
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__STDC_UTF_32__
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Types:
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mbstate_t
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size_t
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size_t mbrtoc8(char8_t* pc8, const char* s, size_t n, mbstate_t* ps); // since C++20
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size_t c8rtomb(char* s, char8_t c8, mbstate_t* ps); // since C++20
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size_t mbrtoc16(char16_t* pc16, const char* s, size_t n, mbstate_t* ps);
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size_t c16rtomb(char* s, char16_t c16, mbstate_t* ps);
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size_t mbrtoc32(char32_t* pc32, const char* s, size_t n, mbstate_t* ps);
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size_t c32rtomb(char* s, char32_t c32, mbstate_t* ps);
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*/
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#include <__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#if !defined(_LIBCPP_CXX03_LANG)
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// Some platforms don't implement <uchar.h> and we don't want to give a hard
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// error on those platforms. When the platform doesn't provide <uchar.h>, at
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// least include <stddef.h> so we get the declaration for size_t.
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#if __has_include_next(<uchar.h>)
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# include_next <uchar.h>
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#else
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# include <stddef.h>
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#endif
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#endif // _LIBCPP_CXX03_LANG
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#endif // _LIBCPP_UCHAR_H
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