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// Character Traits for use by standard string and iostream -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// 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.
/** @file char_traits.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
//
// ISO C++ 14882: 21 Strings library
//
#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/postypes.h> // For streampos
_GLIBCXX_BEGIN_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 (std::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;
}
_GLIBCXX_END_NAMESPACE
_GLIBCXX_BEGIN_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>
{ };
/// @brief 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
/// @brief 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
_GLIBCXX_END_NAMESPACE
#endif
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