377 lines
12 KiB
C++
377 lines
12 KiB
C++
// Character Traits for use by standard string and iostream -*- C++ -*-
|
|
|
|
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
|
|
// 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: 21 Strings library
|
|
//
|
|
|
|
/** @file char_traits.h
|
|
* This is an internal header file, included by other library headers.
|
|
* You should not attempt to use it directly.
|
|
*/
|
|
|
|
#ifndef _CHAR_TRAITS_H
|
|
#define _CHAR_TRAITS_H 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
#include <cstring> // For memmove, memset, memchr
|
|
#include <bits/stl_algobase.h>// For copy, lexicographical_compare, fill_n
|
|
#include <bits/fpos.h> // For streampos
|
|
|
|
namespace __gnu_cxx
|
|
{
|
|
/**
|
|
* @brief Mapping from character type to associated types.
|
|
*
|
|
*
|
|
* @note This is an implementation class for the generic version
|
|
* of char_traits. It defines int_type, off_type, pos_type, and
|
|
* state_type. By default these are unsigned long, streamoff,
|
|
* streampos, and mbstate_t. Users who need a different set of
|
|
* types, but who don't need to change the definitions of any function
|
|
* defined in char_traits, can specialize __gnu_cxx::_Char_types
|
|
* while leaving __gnu_cxx::char_traits alone. */
|
|
template <class _CharT>
|
|
struct _Char_types
|
|
{
|
|
typedef unsigned long int_type;
|
|
typedef std::streampos pos_type;
|
|
typedef std::streamoff off_type;
|
|
typedef std::mbstate_t state_type;
|
|
};
|
|
|
|
|
|
/**
|
|
* @brief Base class used to implement std::char_traits.
|
|
*
|
|
* @note For any given actual character type, this definition is
|
|
* probably wrong. (Most of the member functions are likely to be
|
|
* right, but the int_type and state_type typedefs, and the eof()
|
|
* member function, are likely to be wrong.) The reason this class
|
|
* exists is so users can specialize it. Classes in namespace std
|
|
* may not be specialized for fundamentl types, but classes in
|
|
* namespace __gnu_cxx may be.
|
|
*
|
|
* See http://gcc.gnu.org/onlinedocs/libstdc++/21_strings/howto.html#5
|
|
* for advice on how to make use of this class for "unusual" character
|
|
* types. Also, check out include/ext/pod_char_traits.h. */
|
|
template<typename _CharT>
|
|
struct char_traits
|
|
{
|
|
typedef _CharT char_type;
|
|
typedef typename _Char_types<_CharT>::int_type int_type;
|
|
typedef typename _Char_types<_CharT>::pos_type pos_type;
|
|
typedef typename _Char_types<_CharT>::off_type off_type;
|
|
typedef typename _Char_types<_CharT>::state_type state_type;
|
|
|
|
static void
|
|
assign(char_type& __c1, const char_type& __c2)
|
|
{ __c1 = __c2; }
|
|
|
|
static bool
|
|
eq(const char_type& __c1, const char_type& __c2)
|
|
{ return __c1 == __c2; }
|
|
|
|
static bool
|
|
lt(const char_type& __c1, const char_type& __c2)
|
|
{ return __c1 < __c2; }
|
|
|
|
static int
|
|
compare(const char_type* __s1, const char_type* __s2, std::size_t __n);
|
|
|
|
static std::size_t
|
|
length(const char_type* __s);
|
|
|
|
static const char_type*
|
|
find(const char_type* __s, std::size_t __n, const char_type& __a);
|
|
|
|
static char_type*
|
|
move(char_type* __s1, const char_type* __s2, std::size_t __n);
|
|
|
|
static char_type*
|
|
copy(char_type* __s1, const char_type* __s2, std::size_t __n);
|
|
|
|
static char_type*
|
|
assign(char_type* __s, std::size_t __n, char_type __a);
|
|
|
|
static char_type
|
|
to_char_type(const int_type& __c)
|
|
{ return static_cast<char_type>(__c); }
|
|
|
|
static int_type
|
|
to_int_type(const char_type& __c)
|
|
{ return static_cast<int_type>(__c); }
|
|
|
|
static bool
|
|
eq_int_type(const int_type& __c1, const int_type& __c2)
|
|
{ return __c1 == __c2; }
|
|
|
|
static int_type
|
|
eof()
|
|
{ return static_cast<int_type>(EOF); }
|
|
|
|
static int_type
|
|
not_eof(const int_type& __c)
|
|
{ return !eq_int_type(__c, eof()) ? __c : to_int_type(char_type()); }
|
|
};
|
|
|
|
template<typename _CharT>
|
|
int
|
|
char_traits<_CharT>::
|
|
compare(const char_type* __s1, const char_type* __s2, std::size_t __n)
|
|
{
|
|
for (size_t __i = 0; __i < __n; ++__i)
|
|
if (lt(__s1[__i], __s2[__i]))
|
|
return -1;
|
|
else if (lt(__s2[__i], __s1[__i]))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
template<typename _CharT>
|
|
std::size_t
|
|
char_traits<_CharT>::
|
|
length(const char_type* __p)
|
|
{
|
|
std::size_t __i = 0;
|
|
while (!eq(__p[__i], char_type()))
|
|
++__i;
|
|
return __i;
|
|
}
|
|
|
|
template<typename _CharT>
|
|
const typename char_traits<_CharT>::char_type*
|
|
char_traits<_CharT>::
|
|
find(const char_type* __s, std::size_t __n, const char_type& __a)
|
|
{
|
|
for (std::size_t __i = 0; __i < __n; ++__i)
|
|
if (eq(__s[__i], __a))
|
|
return __s + __i;
|
|
return 0;
|
|
}
|
|
|
|
template<typename _CharT>
|
|
typename char_traits<_CharT>::char_type*
|
|
char_traits<_CharT>::
|
|
move(char_type* __s1, const char_type* __s2, std::size_t __n)
|
|
{
|
|
return static_cast<_CharT*>(std::memmove(__s1, __s2,
|
|
__n * sizeof(char_type)));
|
|
}
|
|
|
|
template<typename _CharT>
|
|
typename char_traits<_CharT>::char_type*
|
|
char_traits<_CharT>::
|
|
copy(char_type* __s1, const char_type* __s2, std::size_t __n)
|
|
{
|
|
std::copy(__s2, __s2 + __n, __s1);
|
|
return __s1;
|
|
}
|
|
|
|
template<typename _CharT>
|
|
typename char_traits<_CharT>::char_type*
|
|
char_traits<_CharT>::
|
|
assign(char_type* __s, std::size_t __n, char_type __a)
|
|
{
|
|
std::fill_n(__s, __n, __a);
|
|
return __s;
|
|
}
|
|
}
|
|
|
|
namespace std
|
|
{
|
|
// 21.1
|
|
/**
|
|
* @brief Basis for explicit traits specializations.
|
|
*
|
|
* @note For any given actual character type, this definition is
|
|
* probably wrong. Since this is just a thin wrapper around
|
|
* __gnu_cxx::char_traits, it is possible to achieve a more
|
|
* appropriate definition by specializing __gnu_cxx::char_traits.
|
|
*
|
|
* See http://gcc.gnu.org/onlinedocs/libstdc++/21_strings/howto.html#5
|
|
* for advice on how to make use of this class for "unusual" character
|
|
* types. Also, check out include/ext/pod_char_traits.h.
|
|
*/
|
|
template<class _CharT>
|
|
struct char_traits
|
|
: public __gnu_cxx::char_traits<_CharT>
|
|
{ };
|
|
|
|
|
|
/// 21.1.3.1 char_traits specializations
|
|
template<>
|
|
struct char_traits<char>
|
|
{
|
|
typedef char char_type;
|
|
typedef int int_type;
|
|
typedef streampos pos_type;
|
|
typedef streamoff off_type;
|
|
typedef mbstate_t state_type;
|
|
|
|
static void
|
|
assign(char_type& __c1, const char_type& __c2)
|
|
{ __c1 = __c2; }
|
|
|
|
static bool
|
|
eq(const char_type& __c1, const char_type& __c2)
|
|
{ return __c1 == __c2; }
|
|
|
|
static bool
|
|
lt(const char_type& __c1, const char_type& __c2)
|
|
{ return __c1 < __c2; }
|
|
|
|
static int
|
|
compare(const char_type* __s1, const char_type* __s2, size_t __n)
|
|
{ return memcmp(__s1, __s2, __n); }
|
|
|
|
static size_t
|
|
length(const char_type* __s)
|
|
{ return strlen(__s); }
|
|
|
|
static const char_type*
|
|
find(const char_type* __s, size_t __n, const char_type& __a)
|
|
{ return static_cast<const char_type*>(memchr(__s, __a, __n)); }
|
|
|
|
static char_type*
|
|
move(char_type* __s1, const char_type* __s2, size_t __n)
|
|
{ return static_cast<char_type*>(memmove(__s1, __s2, __n)); }
|
|
|
|
static char_type*
|
|
copy(char_type* __s1, const char_type* __s2, size_t __n)
|
|
{ return static_cast<char_type*>(memcpy(__s1, __s2, __n)); }
|
|
|
|
static char_type*
|
|
assign(char_type* __s, size_t __n, char_type __a)
|
|
{ return static_cast<char_type*>(memset(__s, __a, __n)); }
|
|
|
|
static char_type
|
|
to_char_type(const int_type& __c)
|
|
{ return static_cast<char_type>(__c); }
|
|
|
|
// To keep both the byte 0xff and the eof symbol 0xffffffff
|
|
// from ending up as 0xffffffff.
|
|
static int_type
|
|
to_int_type(const char_type& __c)
|
|
{ return static_cast<int_type>(static_cast<unsigned char>(__c)); }
|
|
|
|
static bool
|
|
eq_int_type(const int_type& __c1, const int_type& __c2)
|
|
{ return __c1 == __c2; }
|
|
|
|
static int_type
|
|
eof() { return static_cast<int_type>(EOF); }
|
|
|
|
static int_type
|
|
not_eof(const int_type& __c)
|
|
{ return (__c == eof()) ? 0 : __c; }
|
|
};
|
|
|
|
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
/// 21.1.3.2 char_traits specializations
|
|
template<>
|
|
struct char_traits<wchar_t>
|
|
{
|
|
typedef wchar_t char_type;
|
|
typedef wint_t int_type;
|
|
typedef streamoff off_type;
|
|
typedef wstreampos pos_type;
|
|
typedef mbstate_t state_type;
|
|
|
|
static void
|
|
assign(char_type& __c1, const char_type& __c2)
|
|
{ __c1 = __c2; }
|
|
|
|
static bool
|
|
eq(const char_type& __c1, const char_type& __c2)
|
|
{ return __c1 == __c2; }
|
|
|
|
static bool
|
|
lt(const char_type& __c1, const char_type& __c2)
|
|
{ return __c1 < __c2; }
|
|
|
|
static int
|
|
compare(const char_type* __s1, const char_type* __s2, size_t __n)
|
|
{ return wmemcmp(__s1, __s2, __n); }
|
|
|
|
static size_t
|
|
length(const char_type* __s)
|
|
{ return wcslen(__s); }
|
|
|
|
static const char_type*
|
|
find(const char_type* __s, size_t __n, const char_type& __a)
|
|
{ return wmemchr(__s, __a, __n); }
|
|
|
|
static char_type*
|
|
move(char_type* __s1, const char_type* __s2, size_t __n)
|
|
{ return wmemmove(__s1, __s2, __n); }
|
|
|
|
static char_type*
|
|
copy(char_type* __s1, const char_type* __s2, size_t __n)
|
|
{ return wmemcpy(__s1, __s2, __n); }
|
|
|
|
static char_type*
|
|
assign(char_type* __s, size_t __n, char_type __a)
|
|
{ return wmemset(__s, __a, __n); }
|
|
|
|
static char_type
|
|
to_char_type(const int_type& __c) { return char_type(__c); }
|
|
|
|
static int_type
|
|
to_int_type(const char_type& __c) { return int_type(__c); }
|
|
|
|
static bool
|
|
eq_int_type(const int_type& __c1, const int_type& __c2)
|
|
{ return __c1 == __c2; }
|
|
|
|
static int_type
|
|
eof() { return static_cast<int_type>(WEOF); }
|
|
|
|
static int_type
|
|
not_eof(const int_type& __c)
|
|
{ return eq_int_type(__c, eof()) ? 0 : __c; }
|
|
};
|
|
#endif //_GLIBCXX_USE_WCHAR_T
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
struct _Char_traits_match
|
|
{
|
|
_CharT _M_c;
|
|
_Char_traits_match(_CharT const& __c) : _M_c(__c) { }
|
|
|
|
bool
|
|
operator()(_CharT const& __a) { return _Traits::eq(_M_c, __a); }
|
|
};
|
|
} // namespace std
|
|
|
|
#endif
|