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 defined(_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 !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS) && __has_include_next(<wchar.h>) 47 # include_next <wchar.h> // fall back to the C standard provider of mbstate_t 48 #elif __has_include_next(<uchar.h>) 49 # include_next <uchar.h> // <uchar.h> is also required to make mbstate_t visible 50 #else 51 # error "We don't know how to get the definition of mbstate_t without <wchar.h> on your platform." 52 #endif 53 54 #endif // _LIBCPP___MBSTATE_T_H 55