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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_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);
}
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
|
