std_cstring.h

测试手写程序

// -*- C++ -*- header wrapper.

// Copyright (C) 1997-1999, 2000 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

//
// ISO C++ 14882: 20.4.6  C library
//

#ifndef _CPP_CSTRING
#define _CPP_CSTRING 1

# if defined __GLIBC__ && __GLIBC__ >= 2
// We must not see the optimized string functions GNU libc defines.
#  define __NO_STRING_INLINES
# endif

# include <bits/std_cstddef.h>  

namespace _C_legacy {
  extern "C" {
#     define _IN_C_LEGACY_
#     pragma GCC system_header
#     include_next <string.h>
  }

  // We do inline captures of most of these in case they
  // have been optimized with macros.  
  inline void* 
  _CPP_memcpy_capture(void* __s1, void const* __s2, size_t __n)
  { return memcpy(__s1, __s2, __n); }

  inline void* 
  _CPP_memmove_capture(void* __s1, void const* __s2, size_t __n)
  { return memmove(__s1, __s2, __n); }

  inline void* 
  _CPP_strcpy_capture(char* __s1, char const* __s2)
  { return strcpy(__s1, __s2); }

  inline char* 
  _CPP_strncpy_capture(char* __s1, char const* __s2, size_t __n)
  { return strncpy(__s1, __s2, __n); }

  inline char* 
  _CPP_strcat_capture(char* __s1, char const* __s2)
  { return strcat(__s1, __s2); }

  inline char* 
  _CPP_strncat_capture(char* __s1, char const* __s2, size_t __n)
  { return strncat(__s1, __s2, __n); }

  inline int 
  _CPP_memcmp_capture(void const* __s1, void const* __s2, size_t __n)
  { return memcmp(__s1, __s2, __n); }

  inline int 
  _CPP_strcmp_capture(char const* __s1, char const* __s2)
  { return strcmp(__s1, __s2); }

  inline int 
  _CPP_strcoll_capture(char const* __s1, char const* __s2)
  { return strcoll(__s1, __s2); }

  inline int 
  _CPP_strncmp_capture(char const* __s1, char const* __s2, size_t __n)
  { return strncmp(__s1, __s2, __n); }

  inline size_t 
  _CPP_strxfrm_capture(char* __b, char const* __s, size_t __n)
  { return strxfrm(__b, __s, __n); }

  inline void* 
  _CPP_memchr_capture(void const* __s1, int __c, size_t __n)
  { return memchr(__s1, __c, __n); }

  inline char* 
  _CPP_strchr_capture(char const* __s1, int __c)
  { return strchr(__s1, __c); }

  inline size_t 
  _CPP_strcspn_capture(char const* __s1, char const* __s2)
  { return strcspn(__s1, __s2); }

  inline char* 
  _CPP_strpbrk_capture(char const* __s1, char const* __s2)
  { return strpbrk(__s1, __s2); }

  inline char* 
  _CPP_strrchr_capture(char const* __s1, int __c)
  { return strrchr(__s1, __c); }

  inline size_t 
  _CPP_strspn_capture(char const* __s1, char const* __s2)
  { return strspn(__s1, __s2); }

  inline char* 
  _CPP_strstr_capture(char const* __s1, char const* __s2)
  { return strstr(__s1, __s2); }

  inline char* 
  _CPP_strtok_capture(char* __s1, char const* __s2)
  { return strtok(__s1, __s2); }

  inline void* 
  _CPP_memset_capture(void* __s, int __c, size_t __n)
  { return memset(__s, __c, __n); }

  // inline char* 
  // _CPP_strerror_capture(int __num)
  // { return strerror(__num); }

  inline size_t 
  _CPP_strlen_capture(char const* __s)
  { return strlen(__s); }
} // namespace _C_legacy

# undef memcpy
# undef memmove
# undef strcpy
# undef strncpy
# undef strcat
# undef strncat
# undef memcmp
# undef strcmp
# undef strcoll
# undef strncmp
# undef strxfrm
# undef memchr
# undef strchr
# undef strcspn
# undef strpbrk
# undef strrchr
# undef strspn
# undef strstr
# undef strtok
# undef memset
# undef strerror
# undef strlen

namespace std {
  // Redefine most of these inline.  Note that the 
  // C++ definition differs from C in some cases.
  inline void* 
  memcpy(void* __s1, void const* __s2, size_t __n)
  { return _C_legacy::_CPP_memcpy_capture(__s1, __s2, __n); }

  inline void* 
  memmove(void* __s1, void const* __s2, size_t __n)
  { return _C_legacy::_CPP_memmove_capture(__s1, __s2, __n); }

  inline void* 
  strcpy(char* __s1, char const* __s2)
  { return _C_legacy::_CPP_strcpy_capture(__s1, __s2); }

  inline char* 
  strncpy(char* __s1, char const* __s2, size_t __n)
  { return _C_legacy::_CPP_strncpy_capture(__s1, __s2, __n); }

  inline char* 
  strcat(char* __s1, char const* __s2)
  { return _C_legacy::_CPP_strcat_capture(__s1, __s2); }

  inline char* 
  strncat(char* __s1, char const* __s2, size_t __n)
  { return _C_legacy::_CPP_strncat_capture(__s1, __s2, __n); }

  inline int 
  memcmp(void const* __s1, void const* __s2, size_t __n)
  { return _C_legacy::_CPP_memcmp_capture(__s1, __s2, __n); }

  inline int 
  strcmp(char const* __s1, char const* __s2)
  { return _C_legacy::_CPP_strcmp_capture(__s1, __s2); }

  inline int 
  strcoll(char const* __s1, char const* __s2)
  { return _C_legacy::_CPP_strcoll_capture(__s1, __s2); }

  inline int 
  strncmp(char const* __s1, char const* __s2, size_t __n)
  { return _C_legacy::_CPP_strncmp_capture(__s1, __s2, __n); }

  inline size_t 
  strxfrm(char* __b, char const* __s, size_t __n)
  { return _C_legacy::_CPP_strxfrm_capture(__b, __s, __n); }

  inline void 
  const* memchr(void const* __s1, int __c, size_t __n)
  { return _C_legacy::_CPP_memchr_capture(__s1, __c, __n); }

  inline void* 
  memchr(void* __s1, int __c, size_t __n)
  { return _C_legacy::_CPP_memchr_capture(__s1, __c, __n); }

  inline char const* 
  strchr(char const* __s1, int __c)
  { return _C_legacy::_CPP_strchr_capture(__s1, __c); }

  inline char*
  strchr(char* __s1, int __c)
  { return _C_legacy::_CPP_strchr_capture(__s1, __c); }

  inline size_t 
  strcspn(char const* __s1, char const* __s2)
  { return _C_legacy::_CPP_strcspn_capture(__s1, __s2); }

  inline char const* 
  strpbrk(char const* __s1, char const* __s2)
  { return _C_legacy::_CPP_strpbrk_capture(__s1, __s2); }

  inline char* 
  strpbrk(char* __s1, char const* __s2)
  { return _C_legacy::_CPP_strpbrk_capture(__s1, __s2); }

  inline char const* 
  strrchr(char const* __s1, int __c)
  { return _C_legacy::_CPP_strrchr_capture(__s1, __c); }

  inline char* 
  strrchr(char* __s1, int __c)
  { return _C_legacy::_CPP_strrchr_capture(__s1, __c); }

  inline size_t 
  strspn(char const* __s1, char const* __s2)
  { return _C_legacy::_CPP_strspn_capture(__s1, __s2); }

  inline char const* 
  strstr(char const* __s1, char const* __s2)
  { return _C_legacy::_CPP_strstr_capture(__s1, __s2); }

  inline char* 
  strstr(char* __s1, char const* __s2)
  { return _C_legacy::_CPP_strstr_capture(__s1, __s2); }

  inline char* 
  strtok(char* __s1, char const* __s2)
  { return _C_legacy::_CPP_strtok_capture(__s1, __s2); }

  inline void* 
  memset(void* __s, int __c, size_t __n)
  { return _C_legacy::_CPP_memset_capture(__s, __c, __n); }

  using _C_legacy::strerror;

  inline size_t 
  strlen(char const* __s)
  { return _C_legacy::_CPP_strlen_capture(__s); }

} // namespace std

# undef _IN_C_LEGACY_

#endif