2010-05-12 03:42:16 +08:00
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// -*- C++ -*-
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//===--------------------------- cstring ----------------------------------===//
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//
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2019-01-19 16:50:56 +08:00
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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2010-05-12 03:42:16 +08:00
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_CSTRING
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#define _LIBCPP_CSTRING
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/*
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cstring synopsis
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Macros:
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NULL
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2010-08-22 08:02:43 +08:00
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2010-05-12 03:42:16 +08:00
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namespace std
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{
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Types:
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size_t
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void* memcpy(void* restrict s1, const void* restrict s2, size_t n);
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void* memmove(void* s1, const void* s2, size_t n);
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char* strcpy (char* restrict s1, const char* restrict s2);
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char* strncpy(char* restrict s1, const char* restrict s2, size_t n);
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char* strcat (char* restrict s1, const char* restrict s2);
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char* strncat(char* restrict s1, const char* restrict s2, size_t n);
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int memcmp(const void* s1, const void* s2, size_t n);
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int strcmp (const char* s1, const char* s2);
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int strncmp(const char* s1, const char* s2, size_t n);
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int strcoll(const char* s1, const char* s2);
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size_t strxfrm(char* restrict s1, const char* restrict s2, size_t n);
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const void* memchr(const void* s, int c, size_t n);
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void* memchr( void* s, int c, size_t n);
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const char* strchr(const char* s, int c);
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char* strchr( char* s, int c);
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size_t strcspn(const char* s1, const char* s2);
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const char* strpbrk(const char* s1, const char* s2);
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char* strpbrk( char* s1, const char* s2);
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const char* strrchr(const char* s, int c);
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char* strrchr( char* s, int c);
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size_t strspn(const char* s1, const char* s2);
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const char* strstr(const char* s1, const char* s2);
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char* strstr( char* s1, const char* s2);
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char* strtok(char* restrict s1, const char* restrict s2);
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void* memset(void* s, int c, size_t n);
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char* strerror(int errnum);
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size_t strlen(const char* s);
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} // std
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*/
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#include <__config>
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#include <string.h>
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2011-10-18 04:05:10 +08:00
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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2010-05-12 03:42:16 +08:00
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#pragma GCC system_header
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2011-10-18 04:05:10 +08:00
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#endif
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2010-05-12 03:42:16 +08:00
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_LIBCPP_BEGIN_NAMESPACE_STD
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[libc++] Use the using_if_exists attribute when provided
As discussed on cfe-dev [1], use the using_if_exists Clang attribute when
the compiler supports it. This makes it easier to port libc++ on top of
new platforms that don't fully support the C Standard library.
Previously, libc++ would fail to build when trying to import a missing
declaration in a <cXXXX> header. With the attribute, the declaration will
simply not be imported into namespace std, and hence it won't be available
for libc++ to use. In many cases, the declarations were *not* actually
required for libc++ to work (they were only surfaced for users to use
them as std::XXXX), so not importing them into namespace std is acceptable.
The same thing could be achieved by conscious usage of `#ifdef` along
with platform detection, however that quickly creates a maintenance
problem as libc++ is ported to new platforms. Furthermore, this problem
is exacerbated when mixed with vendor internal-only platforms, which can
lead to difficulties maintaining a downstream fork of the library.
For the time being, we only use the using_if_exists attribute when it
is supported. At some point in the future, we will start removing #ifdef
paths that are unnecessary when the attribute is supported, and folks
who need those #ifdef paths will be required to use a compiler that
supports the attribute.
[1]: http://lists.llvm.org/pipermail/cfe-dev/2020-June/066038.html
Differential Revision: https://reviews.llvm.org/D90257
2021-06-02 22:41:37 +08:00
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using ::size_t _LIBCPP_USING_IF_EXISTS;
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using ::memcpy _LIBCPP_USING_IF_EXISTS;
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using ::memmove _LIBCPP_USING_IF_EXISTS;
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using ::strcpy _LIBCPP_USING_IF_EXISTS;
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using ::strncpy _LIBCPP_USING_IF_EXISTS;
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using ::strcat _LIBCPP_USING_IF_EXISTS;
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using ::strncat _LIBCPP_USING_IF_EXISTS;
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using ::memcmp _LIBCPP_USING_IF_EXISTS;
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using ::strcmp _LIBCPP_USING_IF_EXISTS;
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using ::strncmp _LIBCPP_USING_IF_EXISTS;
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using ::strcoll _LIBCPP_USING_IF_EXISTS;
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using ::strxfrm _LIBCPP_USING_IF_EXISTS;
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using ::memchr _LIBCPP_USING_IF_EXISTS;
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using ::strchr _LIBCPP_USING_IF_EXISTS;
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using ::strcspn _LIBCPP_USING_IF_EXISTS;
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using ::strpbrk _LIBCPP_USING_IF_EXISTS;
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using ::strrchr _LIBCPP_USING_IF_EXISTS;
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using ::strspn _LIBCPP_USING_IF_EXISTS;
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using ::strstr _LIBCPP_USING_IF_EXISTS;
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using ::strtok _LIBCPP_USING_IF_EXISTS;
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using ::memset _LIBCPP_USING_IF_EXISTS;
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using ::strerror _LIBCPP_USING_IF_EXISTS;
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using ::strlen _LIBCPP_USING_IF_EXISTS;
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2015-10-30 07:32:29 +08:00
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2010-05-12 03:42:16 +08:00
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_LIBCPP_END_NAMESPACE_STD
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2021-04-21 00:03:32 +08:00
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#endif // _LIBCPP_CSTRING
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