cwchar

// -*- 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

*/

#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
#include <__type_traits/apply_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 ::size_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<__apply_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

#endif // _LIBCPP_CWCHAR