// -*- 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_CSTRING

#define _LIBCPP_CSTRING

/*

    cstring synopsis

Macros:

    NULL

namespace std

{

Types:

    size_t

void* memcpy(void* restrict s1, const void* restrict s2, size_t n);

void* memmove(void* s1, const void* s2, size_t n);

char* strcpy (char* restrict s1, const char* restrict s2);

char* strncpy(char* restrict s1, const char* restrict s2, size_t n);

char* strcat (char* restrict s1, const char* restrict s2);

char* strncat(char* restrict s1, const char* restrict s2, size_t n);

int memcmp(const void* s1, const void* s2, size_t n);

int strcmp (const char* s1, const char* s2);

int strncmp(const char* s1, const char* s2, size_t n);

int strcoll(const char* s1, const char* s2);

size_t strxfrm(char* restrict s1, const char* restrict s2, size_t n);

const void* memchr(const void* s, int c, size_t n);

      void* memchr(      void* s, int c, size_t n);

const char* strchr(const char* s, int c);

      char* strchr(      char* s, int c);

size_t strcspn(const char* s1, const char* s2);

const char* strpbrk(const char* s1, const char* s2);

      char* strpbrk(      char* s1, const char* s2);

const char* strrchr(const char* s, int c);

      char* strrchr(      char* s, int c);

size_t strspn(const char* s1, const char* s2);

const char* strstr(const char* s1, const char* s2);

      char* strstr(      char* s1, const char* s2);

char* strtok(char* restrict s1, const char* restrict s2);

void* memset(void* s, int c, size_t n);

char* strerror(int errnum);

size_t strlen(const char* s);

}  // std

*/

#include <__assert> // all public C++ headers provide the assertion handler

#include <__config>

#include <__type_traits/is_constant_evaluated.h>

#include <string.h>

#ifndef _LIBCPP_STRING_H

#   error <cstring> tried including <string.h> but didn't find libc++'s <string.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 ::size_t _LIBCPP_USING_IF_EXISTS;

using ::memcpy _LIBCPP_USING_IF_EXISTS;

using ::memmove _LIBCPP_USING_IF_EXISTS;

using ::strcpy _LIBCPP_USING_IF_EXISTS;

using ::strncpy _LIBCPP_USING_IF_EXISTS;

using ::strcat _LIBCPP_USING_IF_EXISTS;

using ::strncat _LIBCPP_USING_IF_EXISTS;

using ::memcmp _LIBCPP_USING_IF_EXISTS;

using ::strcmp _LIBCPP_USING_IF_EXISTS;

using ::strncmp _LIBCPP_USING_IF_EXISTS;

using ::strcoll _LIBCPP_USING_IF_EXISTS;

using ::strxfrm _LIBCPP_USING_IF_EXISTS;

using ::memchr _LIBCPP_USING_IF_EXISTS;

using ::strchr _LIBCPP_USING_IF_EXISTS;

using ::strcspn _LIBCPP_USING_IF_EXISTS;

using ::strpbrk _LIBCPP_USING_IF_EXISTS;

using ::strrchr _LIBCPP_USING_IF_EXISTS;

using ::strspn _LIBCPP_USING_IF_EXISTS;

using ::strstr _LIBCPP_USING_IF_EXISTS;

using ::strtok _LIBCPP_USING_IF_EXISTS;

using ::memset _LIBCPP_USING_IF_EXISTS;

using ::strerror _LIBCPP_USING_IF_EXISTS;

using ::strlen _LIBCPP_USING_IF_EXISTS;

inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 size_t __constexpr_strlen(const char* __str) {

  // GCC currently doesn't support __builtin_strlen for heap-allocated memory during constant evaluation.

  // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70816

#ifdef _LIBCPP_COMPILER_GCC

  if (__libcpp_is_constant_evaluated()) {

    size_t __i = 0;

    for (; __str[__i] != '\0'; ++__i)

      ;

    return __i;

  }

#endif

  return __builtin_strlen(__str);

}

template <class _Tp>

_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int

__constexpr_memcmp(const _Tp* __lhs, const _Tp* __rhs, size_t __count) {

#ifdef _LIBCPP_COMPILER_GCC

  if (__libcpp_is_constant_evaluated()) {

    for (; __count; --__count, ++__lhs, ++__rhs) {

      if (*__lhs < *__rhs)

        return -1;

      if (*__rhs < *__lhs)

        return 1;

    }

    return 0;

  }

#endif

  return __builtin_memcmp(__lhs, __rhs, __count);

}

int std::__1::__constexpr_memcmp[abi:v160006]<char>(char const*, char const*, unsigned long)

Line

Count

Source

119

115k

__constexpr_memcmp(const _Tp* __lhs, const _Tp* __rhs, size_t __count) {

120

#ifdef _LIBCPP_COMPILER_GCC

121

  if (__libcpp_is_constant_evaluated()) {

122

    for (; __count; --__count, ++__lhs, ++__rhs) {

123

      if (*__lhs < *__rhs)

124

        return -1;

125

      if (*__rhs < *__lhs)

126

        return 1;

127

    }

128

    return 0;

129

  }

130

#endif

131

115k

  return __builtin_memcmp(__lhs, __rhs, __count);

132

115k

}

Unexecuted instantiation: int std::__1::__constexpr_memcmp[abi:v160006]<char8_t>(char8_t const*, char8_t const*, unsigned long)

inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const char*

__constexpr_char_memchr(const char* __str, int __char, size_t __count) {

#if __has_builtin(__builtin_char_memchr)

  return __builtin_char_memchr(__str, __char, __count);

#else

  if (!__libcpp_is_constant_evaluated())

    return static_cast<const char*>(std::memchr(__str, __char, __count));

  for (; __count; --__count) {

    if (*__str == __char)

      return __str;

    ++__str;

  }

  return nullptr;

#endif

}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_CSTRING