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clang-p2996/libcxx/include/cwchar
Nikolas Klauser b9a2658a3e [libc++][C++03] Use __cxx03/ headers in C++03 mode (#109002) 
This patch implements the forwarding to frozen C++03 headers as
discussed in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the
RFC, we initially proposed selecting the right headers from the Clang
driver, however consensus seemed to steer towards handling this in the
library itself. This patch implements that direction.

At a high level, the changes basically amount to making each public
header look like this:

```
// inside <vector>
#ifdef _LIBCPP_CXX03_LANG
#  include <__cxx03/vector>
#else
  // normal <vector> content
#endif
```

In most cases, public headers are simple umbrella headers so there isn't
much code in the #else branch. In other cases, the #else branch contains
the actual implementation of the header.
2024-12-21 13:01:48 +01:00

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// -*- 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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_CWCHAR
#define _LIBCPP_CWCHAR
/*
cwchar synopsis
Macros:
NULL
WCHAR_MAX
WCHAR_MIN
WEOF
namespace std
{
Types:
mbstate_t
size_t
tm
wint_t
int fwprintf(FILE* restrict stream, const wchar_t* restrict format, ...);
int fwscanf(FILE* restrict stream, const wchar_t* restrict format, ...);
int swprintf(wchar_t* restrict s, size_t n, const wchar_t* restrict format, ...);
int swscanf(const wchar_t* restrict s, const wchar_t* restrict format, ...);
int vfwprintf(FILE* restrict stream, const wchar_t* restrict format, va_list arg);
int vfwscanf(FILE* restrict stream, const wchar_t* restrict format, va_list arg); // C99
int vswprintf(wchar_t* restrict s, size_t n, const wchar_t* restrict format, va_list arg);
int vswscanf(const wchar_t* restrict s, const wchar_t* restrict format, va_list arg); // C99
int vwprintf(const wchar_t* restrict format, va_list arg);
int vwscanf(const wchar_t* restrict format, va_list arg); // C99
int wprintf(const wchar_t* restrict format, ...);
int wscanf(const wchar_t* restrict format, ...);
wint_t fgetwc(FILE* stream);
wchar_t* fgetws(wchar_t* restrict s, int n, FILE* restrict stream);
wint_t fputwc(wchar_t c, FILE* stream);
int fputws(const wchar_t* restrict s, FILE* restrict stream);
int fwide(FILE* stream, int mode);
wint_t getwc(FILE* stream);
wint_t getwchar();
wint_t putwc(wchar_t c, FILE* stream);
wint_t putwchar(wchar_t c);
wint_t ungetwc(wint_t c, FILE* stream);
double wcstod(const wchar_t* restrict nptr, wchar_t** restrict endptr);
float wcstof(const wchar_t* restrict nptr, wchar_t** restrict endptr); // C99
long double wcstold(const wchar_t* restrict nptr, wchar_t** restrict endptr); // C99
long wcstol(const wchar_t* restrict nptr, wchar_t** restrict endptr, int base);
long long wcstoll(const wchar_t* restrict nptr, wchar_t** restrict endptr, int base); // C99
unsigned long wcstoul(const wchar_t* restrict nptr, wchar_t** restrict endptr, int base);
unsigned long long wcstoull(const wchar_t* restrict nptr, wchar_t** restrict endptr, int base); // C99
wchar_t* wcscpy(wchar_t* restrict s1, const wchar_t* restrict s2);
wchar_t* wcsncpy(wchar_t* restrict s1, const wchar_t* restrict s2, size_t n);
wchar_t* wcscat(wchar_t* restrict s1, const wchar_t* restrict s2);
wchar_t* wcsncat(wchar_t* restrict s1, const wchar_t* restrict s2, size_t n);
int wcscmp(const wchar_t* s1, const wchar_t* s2);
int wcscoll(const wchar_t* s1, const wchar_t* s2);
int wcsncmp(const wchar_t* s1, const wchar_t* s2, size_t n);
size_t wcsxfrm(wchar_t* restrict s1, const wchar_t* restrict s2, size_t n);
const wchar_t* wcschr(const wchar_t* s, wchar_t c);
wchar_t* wcschr( wchar_t* s, wchar_t c);
size_t wcscspn(const wchar_t* s1, const wchar_t* s2);
size_t wcslen(const wchar_t* s);
const wchar_t* wcspbrk(const wchar_t* s1, const wchar_t* s2);
wchar_t* wcspbrk( wchar_t* s1, const wchar_t* s2);
const wchar_t* wcsrchr(const wchar_t* s, wchar_t c);
wchar_t* wcsrchr( wchar_t* s, wchar_t c);
size_t wcsspn(const wchar_t* s1, const wchar_t* s2);
const wchar_t* wcsstr(const wchar_t* s1, const wchar_t* s2);
wchar_t* wcsstr( wchar_t* s1, const wchar_t* s2);
wchar_t* wcstok(wchar_t* restrict s1, const wchar_t* restrict s2, wchar_t** restrict ptr);
const wchar_t* wmemchr(const wchar_t* s, wchar_t c, size_t n);
wchar_t* wmemchr( wchar_t* s, wchar_t c, size_t n);
int wmemcmp(wchar_t* restrict s1, const wchar_t* restrict s2, size_t n);
wchar_t* wmemcpy(wchar_t* restrict s1, const wchar_t* restrict s2, size_t n);
wchar_t* wmemmove(wchar_t* s1, const wchar_t* s2, size_t n);
wchar_t* wmemset(wchar_t* s, wchar_t c, size_t n);
size_t wcsftime(wchar_t* restrict s, size_t maxsize, const wchar_t* restrict format,
const tm* restrict timeptr);
wint_t btowc(int c);
int wctob(wint_t c);
int mbsinit(const mbstate_t* ps);
size_t mbrlen(const char* restrict s, size_t n, mbstate_t* restrict ps);
size_t mbrtowc(wchar_t* restrict pwc, const char* restrict s, size_t n, mbstate_t* restrict ps);
size_t wcrtomb(char* restrict s, wchar_t wc, mbstate_t* restrict ps);
size_t mbsrtowcs(wchar_t* restrict dst, const char** restrict src, size_t len,
mbstate_t* restrict ps);
size_t wcsrtombs(char* restrict dst, const wchar_t** restrict src, size_t len,
mbstate_t* restrict ps);
} // std
*/
#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
# include <__cxx03/cwchar>
#else
# include <__config>
# include <__cstddef/size_t.h>
# include <__type_traits/copy_cv.h>
# include <__type_traits/is_constant_evaluated.h>
# include <__type_traits/is_equality_comparable.h>
# include <__type_traits/is_same.h>
# include <__type_traits/remove_cv.h>
# include <cwctype>
# include <wchar.h>
# ifndef _LIBCPP_WCHAR_H
# error <cwchar> tried including <wchar.h> but didn't find libc++'s <wchar.h> header. \
This usually means that your header search paths are not configured properly. \
The header search paths should contain the C++ Standard Library headers before \
any C Standard Library, and you are probably using compiler flags that make that \
not be the case.
# endif
# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
# endif
_LIBCPP_BEGIN_NAMESPACE_STD
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
using ::tm _LIBCPP_USING_IF_EXISTS;
using ::wint_t _LIBCPP_USING_IF_EXISTS;
using ::FILE _LIBCPP_USING_IF_EXISTS;
using ::fwprintf _LIBCPP_USING_IF_EXISTS;
using ::fwscanf _LIBCPP_USING_IF_EXISTS;
using ::swprintf _LIBCPP_USING_IF_EXISTS;
using ::vfwprintf _LIBCPP_USING_IF_EXISTS;
using ::vswprintf _LIBCPP_USING_IF_EXISTS;
using ::swscanf _LIBCPP_USING_IF_EXISTS;
using ::vfwscanf _LIBCPP_USING_IF_EXISTS;
using ::vswscanf _LIBCPP_USING_IF_EXISTS;
using ::fgetwc _LIBCPP_USING_IF_EXISTS;
using ::fgetws _LIBCPP_USING_IF_EXISTS;
using ::fputwc _LIBCPP_USING_IF_EXISTS;
using ::fputws _LIBCPP_USING_IF_EXISTS;
using ::fwide _LIBCPP_USING_IF_EXISTS;
using ::getwc _LIBCPP_USING_IF_EXISTS;
using ::putwc _LIBCPP_USING_IF_EXISTS;
using ::ungetwc _LIBCPP_USING_IF_EXISTS;
using ::wcstod _LIBCPP_USING_IF_EXISTS;
using ::wcstof _LIBCPP_USING_IF_EXISTS;
using ::wcstold _LIBCPP_USING_IF_EXISTS;
using ::wcstol _LIBCPP_USING_IF_EXISTS;
using ::wcstoll _LIBCPP_USING_IF_EXISTS;
using ::wcstoul _LIBCPP_USING_IF_EXISTS;
using ::wcstoull _LIBCPP_USING_IF_EXISTS;
using ::wcscpy _LIBCPP_USING_IF_EXISTS;
using ::wcsncpy _LIBCPP_USING_IF_EXISTS;
using ::wcscat _LIBCPP_USING_IF_EXISTS;
using ::wcsncat _LIBCPP_USING_IF_EXISTS;
using ::wcscmp _LIBCPP_USING_IF_EXISTS;
using ::wcscoll _LIBCPP_USING_IF_EXISTS;
using ::wcsncmp _LIBCPP_USING_IF_EXISTS;
using ::wcsxfrm _LIBCPP_USING_IF_EXISTS;
using ::wcschr _LIBCPP_USING_IF_EXISTS;
using ::wcspbrk _LIBCPP_USING_IF_EXISTS;
using ::wcsrchr _LIBCPP_USING_IF_EXISTS;
using ::wcsstr _LIBCPP_USING_IF_EXISTS;
using ::wmemchr _LIBCPP_USING_IF_EXISTS;
using ::wcscspn _LIBCPP_USING_IF_EXISTS;
using ::wcslen _LIBCPP_USING_IF_EXISTS;
using ::wcsspn _LIBCPP_USING_IF_EXISTS;
using ::wcstok _LIBCPP_USING_IF_EXISTS;
using ::wmemcmp _LIBCPP_USING_IF_EXISTS;
using ::wmemcpy _LIBCPP_USING_IF_EXISTS;
using ::wmemmove _LIBCPP_USING_IF_EXISTS;
using ::wmemset _LIBCPP_USING_IF_EXISTS;
using ::wcsftime _LIBCPP_USING_IF_EXISTS;
using ::btowc _LIBCPP_USING_IF_EXISTS;
using ::wctob _LIBCPP_USING_IF_EXISTS;
using ::mbsinit _LIBCPP_USING_IF_EXISTS;
using ::mbrlen _LIBCPP_USING_IF_EXISTS;
using ::mbrtowc _LIBCPP_USING_IF_EXISTS;
using ::wcrtomb _LIBCPP_USING_IF_EXISTS;
using ::mbsrtowcs _LIBCPP_USING_IF_EXISTS;
using ::wcsrtombs _LIBCPP_USING_IF_EXISTS;
using ::getwchar _LIBCPP_USING_IF_EXISTS;
using ::vwscanf _LIBCPP_USING_IF_EXISTS;
using ::wscanf _LIBCPP_USING_IF_EXISTS;
using ::putwchar _LIBCPP_USING_IF_EXISTS;
using ::vwprintf _LIBCPP_USING_IF_EXISTS;
using ::wprintf _LIBCPP_USING_IF_EXISTS;
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 size_t __constexpr_wcslen(const wchar_t* __str) {
# if __has_builtin(__builtin_wcslen)
return __builtin_wcslen(__str);
# else
if (!__libcpp_is_constant_evaluated())
return std::wcslen(__str);
size_t __len = 0;
for (; *__str != L'\0'; ++__str)
++__len;
return __len;
# endif
}
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int
__constexpr_wmemcmp(const wchar_t* __lhs, const wchar_t* __rhs, size_t __count) {
# if __has_builtin(__builtin_wmemcmp)
return __builtin_wmemcmp(__lhs, __rhs, __count);
# else
if (!__libcpp_is_constant_evaluated())
return std::wmemcmp(__lhs, __rhs, __count);
for (; __count; --__count, ++__lhs, ++__rhs) {
if (*__lhs < *__rhs)
return -1;
if (*__rhs < *__lhs)
return 1;
}
return 0;
# endif
}
template <class _Tp, class _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp* __constexpr_wmemchr(_Tp* __str, _Up __value, size_t __count) {
static_assert(sizeof(_Tp) == sizeof(wchar_t)&& _LIBCPP_ALIGNOF(_Tp) >= _LIBCPP_ALIGNOF(wchar_t) &&
__libcpp_is_trivially_equality_comparable<_Tp, _Tp>::value,
"Calling wmemchr on non-trivially equality comparable types is unsafe.");
# if __has_builtin(__builtin_wmemchr)
if (!__libcpp_is_constant_evaluated()) {
wchar_t __value_buffer = 0;
__builtin_memcpy(&__value_buffer, &__value, sizeof(wchar_t));
return reinterpret_cast<_Tp*>(
__builtin_wmemchr(reinterpret_cast<__copy_cv_t<_Tp, wchar_t>*>(__str), __value_buffer, __count));
}
# if _LIBCPP_STD_VER >= 17
else if constexpr (is_same_v<remove_cv_t<_Tp>, wchar_t>)
return __builtin_wmemchr(__str, __value, __count);
# endif
# endif // __has_builtin(__builtin_wmemchr)
for (; __count; --__count) {
if (*__str == __value)
return __str;
++__str;
}
return nullptr;
}
_LIBCPP_END_NAMESPACE_STD
# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
# include <cstddef>
# endif
#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
#endif // _LIBCPP_CWCHAR
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