5d87f60f89
Some platforms don't provide all C library headers. In practice, libc++
only requires a few C library headers to exist, and only a few functions
on those headers. Missing functions that libc++ doesn't need for its own
implementation are handled properly by the using_if_exists attribute,
however a missing header is currently a hard error when we try to
do #include_next.
This patch should make libc++ more flexible on platforms that do not
provide C headers that libc++ doesn't actually require for its own
implementation. The only downside is that it may move some errors from
the #include_next point to later in the compilation if we actually try
to use something that isn't provided, which could be somewhat confusing.
However, these errors should be caught by folks trying to port libc++
over to a new platform (when running the libc++ test suite), not by end
users.
NOTE: This is a reapplicaton of 226409, which was reverted in 674729813
because it broke the build. The issue has now been fixed with
https://reviews.llvm.org/D138062.
Differential Revision: https://reviews.llvm.org/D136683
112 lines
4.6 KiB
C++
112 lines
4.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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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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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_STRING_H
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#define _LIBCPP_STRING_H
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/*
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string.h synopsis
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Macros:
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NULL
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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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*/
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#include <__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#if __has_include_next(<string.h>)
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# include_next <string.h>
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#endif
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// MSVCRT, GNU libc and its derivates may already have the correct prototype in
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// <string.h>. This macro can be defined by users if their C library provides
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// the right signature.
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#if defined(__CORRECT_ISO_CPP_STRING_H_PROTO) || defined(_LIBCPP_MSVCRT) || \
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defined(__sun__) || defined(_STRING_H_CPLUSPLUS_98_CONFORMANCE_)
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#define _LIBCPP_STRING_H_HAS_CONST_OVERLOADS
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#endif
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#if defined(__cplusplus) && !defined(_LIBCPP_STRING_H_HAS_CONST_OVERLOADS) && defined(_LIBCPP_PREFERRED_OVERLOAD)
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extern "C++" {
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inline _LIBCPP_INLINE_VISIBILITY
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char* __libcpp_strchr(const char* __s, int __c) {return (char*)strchr(__s, __c);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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const char* strchr(const char* __s, int __c) {return __libcpp_strchr(__s, __c);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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char* strchr( char* __s, int __c) {return __libcpp_strchr(__s, __c);}
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inline _LIBCPP_INLINE_VISIBILITY
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char* __libcpp_strpbrk(const char* __s1, const char* __s2) {return (char*)strpbrk(__s1, __s2);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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const char* strpbrk(const char* __s1, const char* __s2) {return __libcpp_strpbrk(__s1, __s2);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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char* strpbrk( char* __s1, const char* __s2) {return __libcpp_strpbrk(__s1, __s2);}
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inline _LIBCPP_INLINE_VISIBILITY
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char* __libcpp_strrchr(const char* __s, int __c) {return (char*)strrchr(__s, __c);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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const char* strrchr(const char* __s, int __c) {return __libcpp_strrchr(__s, __c);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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char* strrchr( char* __s, int __c) {return __libcpp_strrchr(__s, __c);}
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inline _LIBCPP_INLINE_VISIBILITY
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void* __libcpp_memchr(const void* __s, int __c, size_t __n) {return (void*)memchr(__s, __c, __n);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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const void* memchr(const void* __s, int __c, size_t __n) {return __libcpp_memchr(__s, __c, __n);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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void* memchr( void* __s, int __c, size_t __n) {return __libcpp_memchr(__s, __c, __n);}
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inline _LIBCPP_INLINE_VISIBILITY
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char* __libcpp_strstr(const char* __s1, const char* __s2) {return (char*)strstr(__s1, __s2);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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const char* strstr(const char* __s1, const char* __s2) {return __libcpp_strstr(__s1, __s2);}
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_PREFERRED_OVERLOAD
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char* strstr( char* __s1, const char* __s2) {return __libcpp_strstr(__s1, __s2);}
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}
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#endif
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#endif // _LIBCPP_STRING_H
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