1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___MBSTATE_T_H
11#define _LIBCPP___MBSTATE_T_H
12
13#include <__config>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16# pragma GCC system_header
17#endif
18
19// The goal of this header is to provide mbstate_t without requiring all of
20// <uchar.h> or <wchar.h>. It's also used by the libc++ versions of <uchar.h>
21// and <wchar.h> to get mbstate_t when the C library doesn't provide <uchar.h>
22// or <wchar.h>, hence the #include_next of those headers instead of #include.
23// (e.g. if <wchar.h> isn't present in the C library, the libc++ <wchar.h>
24// will include this header. This header needs to not turn around and cyclically
25// include <wchar.h>, but fall through to <uchar.h>.)
26//
27// This does not define std::mbstate_t -- this only brings in the declaration
28// in the global namespace.
29
30// We define this here to support older versions of glibc <wchar.h> that do
31// not define this for clang. This is also set in libc++'s <wchar.h> header,
32// and we need to do so here too to avoid a different function signature given
33// a different include order.
34#ifdef __cplusplus
35# define __CORRECT_ISO_CPP_WCHAR_H_PROTO
36#endif
37
38#if _LIBCPP_HAS_MUSL_LIBC
39# define __NEED_mbstate_t
40# include <bits/alltypes.h>
41# undef __NEED_mbstate_t
42#elif __has_include(<bits/types/mbstate_t.h>)
43# include <bits/types/mbstate_t.h> // works on most Unixes
44#elif __has_include(<sys/_types/_mbstate_t.h>)
45# include <sys/_types/_mbstate_t.h> // works on Darwin
46#elif __has_include_next(<wchar.h>)
47# include_next <wchar.h> // use the C standard provider of mbstate_t if present
48#elif __has_include_next(<uchar.h>)
49# include_next <uchar.h> // Try <uchar.h> in absence of <wchar.h> for mbstate_t
50#else
51# error "We don't know how to get the definition of mbstate_t on your platform."
52#endif
53
54#endif // _LIBCPP___MBSTATE_T_H
55