578 lines
17 KiB
C++
578 lines
17 KiB
C++
// Character Traits for use by standard string and iostream -*- C++ -*-
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// Copyright (C) 1997-2015 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/char_traits.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{string}
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*/
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//
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// ISO C++ 14882: 21 Strings library
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//
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#ifndef _CHAR_TRAITS_H
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#define _CHAR_TRAITS_H 1
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#pragma GCC system_header
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#include <bits/stl_algobase.h> // std::copy, std::fill_n
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#include <bits/postypes.h> // For streampos
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#include <cwchar> // For WEOF, wmemmove, wmemset, etc.
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @brief Mapping from character type to associated types.
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*
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* @note This is an implementation class for the generic version
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* of char_traits. It defines int_type, off_type, pos_type, and
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* state_type. By default these are unsigned long, streamoff,
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* streampos, and mbstate_t. Users who need a different set of
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* types, but who don't need to change the definitions of any function
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* defined in char_traits, can specialize __gnu_cxx::_Char_types
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* while leaving __gnu_cxx::char_traits alone. */
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template<typename _CharT>
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struct _Char_types
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{
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typedef unsigned long int_type;
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typedef std::streampos pos_type;
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typedef std::streamoff off_type;
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typedef std::mbstate_t state_type;
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};
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/**
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* @brief Base class used to implement std::char_traits.
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*
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* @note For any given actual character type, this definition is
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* probably wrong. (Most of the member functions are likely to be
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* right, but the int_type and state_type typedefs, and the eof()
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* member function, are likely to be wrong.) The reason this class
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* exists is so users can specialize it. Classes in namespace std
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* may not be specialized for fundamental types, but classes in
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* namespace __gnu_cxx may be.
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*
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* See https://gcc.gnu.org/onlinedocs/libstdc++/manual/strings.html#strings.string.character_types
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* for advice on how to make use of this class for @a unusual character
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* types. Also, check out include/ext/pod_char_traits.h.
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*/
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template<typename _CharT>
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struct char_traits
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{
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typedef _CharT char_type;
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typedef typename _Char_types<_CharT>::int_type int_type;
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typedef typename _Char_types<_CharT>::pos_type pos_type;
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typedef typename _Char_types<_CharT>::off_type off_type;
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typedef typename _Char_types<_CharT>::state_type state_type;
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static void
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assign(char_type& __c1, const char_type& __c2)
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{ __c1 = __c2; }
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static _GLIBCXX_CONSTEXPR bool
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eq(const char_type& __c1, const char_type& __c2)
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{ return __c1 == __c2; }
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static _GLIBCXX_CONSTEXPR bool
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lt(const char_type& __c1, const char_type& __c2)
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{ return __c1 < __c2; }
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static int
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compare(const char_type* __s1, const char_type* __s2, std::size_t __n);
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static std::size_t
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length(const char_type* __s);
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static const char_type*
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find(const char_type* __s, std::size_t __n, const char_type& __a);
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static char_type*
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move(char_type* __s1, const char_type* __s2, std::size_t __n);
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static char_type*
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copy(char_type* __s1, const char_type* __s2, std::size_t __n);
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static char_type*
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assign(char_type* __s, std::size_t __n, char_type __a);
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static _GLIBCXX_CONSTEXPR char_type
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to_char_type(const int_type& __c)
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{ return static_cast<char_type>(__c); }
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static _GLIBCXX_CONSTEXPR int_type
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to_int_type(const char_type& __c)
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{ return static_cast<int_type>(__c); }
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static _GLIBCXX_CONSTEXPR bool
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eq_int_type(const int_type& __c1, const int_type& __c2)
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{ return __c1 == __c2; }
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static _GLIBCXX_CONSTEXPR int_type
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eof()
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{ return static_cast<int_type>(_GLIBCXX_STDIO_EOF); }
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static _GLIBCXX_CONSTEXPR int_type
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not_eof(const int_type& __c)
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{ return !eq_int_type(__c, eof()) ? __c : to_int_type(char_type()); }
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};
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template<typename _CharT>
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int
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char_traits<_CharT>::
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compare(const char_type* __s1, const char_type* __s2, std::size_t __n)
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{
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for (std::size_t __i = 0; __i < __n; ++__i)
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if (lt(__s1[__i], __s2[__i]))
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return -1;
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else if (lt(__s2[__i], __s1[__i]))
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return 1;
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return 0;
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}
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template<typename _CharT>
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std::size_t
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char_traits<_CharT>::
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length(const char_type* __p)
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{
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std::size_t __i = 0;
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while (!eq(__p[__i], char_type()))
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++__i;
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return __i;
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}
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template<typename _CharT>
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const typename char_traits<_CharT>::char_type*
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char_traits<_CharT>::
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find(const char_type* __s, std::size_t __n, const char_type& __a)
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{
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for (std::size_t __i = 0; __i < __n; ++__i)
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if (eq(__s[__i], __a))
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return __s + __i;
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return 0;
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}
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template<typename _CharT>
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typename char_traits<_CharT>::char_type*
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char_traits<_CharT>::
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move(char_type* __s1, const char_type* __s2, std::size_t __n)
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{
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return static_cast<_CharT*>(__builtin_memmove(__s1, __s2,
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__n * sizeof(char_type)));
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}
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template<typename _CharT>
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typename char_traits<_CharT>::char_type*
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char_traits<_CharT>::
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copy(char_type* __s1, const char_type* __s2, std::size_t __n)
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{
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// NB: Inline std::copy so no recursive dependencies.
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std::copy(__s2, __s2 + __n, __s1);
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return __s1;
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}
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template<typename _CharT>
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typename char_traits<_CharT>::char_type*
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char_traits<_CharT>::
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assign(char_type* __s, std::size_t __n, char_type __a)
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{
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// NB: Inline std::fill_n so no recursive dependencies.
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std::fill_n(__s, __n, __a);
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return __s;
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// 21.1
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/**
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* @brief Basis for explicit traits specializations.
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*
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* @note For any given actual character type, this definition is
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* probably wrong. Since this is just a thin wrapper around
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* __gnu_cxx::char_traits, it is possible to achieve a more
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* appropriate definition by specializing __gnu_cxx::char_traits.
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*
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* See https://gcc.gnu.org/onlinedocs/libstdc++/manual/strings.html#strings.string.character_types
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* for advice on how to make use of this class for @a unusual character
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* types. Also, check out include/ext/pod_char_traits.h.
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*/
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template<class _CharT>
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struct char_traits : public __gnu_cxx::char_traits<_CharT>
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{ };
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/// 21.1.3.1 char_traits specializations
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template<>
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struct char_traits<char>
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{
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typedef char char_type;
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typedef int int_type;
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typedef streampos pos_type;
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typedef streamoff off_type;
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typedef mbstate_t state_type;
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static void
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assign(char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
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{ __c1 = __c2; }
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static _GLIBCXX_CONSTEXPR bool
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eq(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
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{ return __c1 == __c2; }
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static _GLIBCXX_CONSTEXPR bool
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lt(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
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{
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// LWG 467.
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return (static_cast<unsigned char>(__c1)
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< static_cast<unsigned char>(__c2));
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}
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static int
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compare(const char_type* __s1, const char_type* __s2, size_t __n)
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{ return __builtin_memcmp(__s1, __s2, __n); }
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static size_t
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length(const char_type* __s)
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{ return __builtin_strlen(__s); }
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static const char_type*
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find(const char_type* __s, size_t __n, const char_type& __a)
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{ return static_cast<const char_type*>(__builtin_memchr(__s, __a, __n)); }
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static char_type*
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move(char_type* __s1, const char_type* __s2, size_t __n)
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{ return static_cast<char_type*>(__builtin_memmove(__s1, __s2, __n)); }
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static char_type*
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copy(char_type* __s1, const char_type* __s2, size_t __n)
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{ return static_cast<char_type*>(__builtin_memcpy(__s1, __s2, __n)); }
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static char_type*
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assign(char_type* __s, size_t __n, char_type __a)
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{ return static_cast<char_type*>(__builtin_memset(__s, __a, __n)); }
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static _GLIBCXX_CONSTEXPR char_type
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to_char_type(const int_type& __c) _GLIBCXX_NOEXCEPT
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{ return static_cast<char_type>(__c); }
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// To keep both the byte 0xff and the eof symbol 0xffffffff
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// from ending up as 0xffffffff.
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static _GLIBCXX_CONSTEXPR int_type
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to_int_type(const char_type& __c) _GLIBCXX_NOEXCEPT
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{ return static_cast<int_type>(static_cast<unsigned char>(__c)); }
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static _GLIBCXX_CONSTEXPR bool
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eq_int_type(const int_type& __c1, const int_type& __c2) _GLIBCXX_NOEXCEPT
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{ return __c1 == __c2; }
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static _GLIBCXX_CONSTEXPR int_type
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eof() _GLIBCXX_NOEXCEPT
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{ return static_cast<int_type>(_GLIBCXX_STDIO_EOF); }
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static _GLIBCXX_CONSTEXPR int_type
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not_eof(const int_type& __c) _GLIBCXX_NOEXCEPT
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{ return (__c == eof()) ? 0 : __c; }
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};
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#ifdef _GLIBCXX_USE_WCHAR_T
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/// 21.1.3.2 char_traits specializations
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template<>
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struct char_traits<wchar_t>
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{
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typedef wchar_t char_type;
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typedef wint_t int_type;
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typedef streamoff off_type;
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typedef wstreampos pos_type;
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typedef mbstate_t state_type;
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static void
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assign(char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
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{ __c1 = __c2; }
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static _GLIBCXX_CONSTEXPR bool
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eq(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
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{ return __c1 == __c2; }
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static _GLIBCXX_CONSTEXPR bool
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lt(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
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{ return __c1 < __c2; }
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static int
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compare(const char_type* __s1, const char_type* __s2, size_t __n)
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{ return wmemcmp(__s1, __s2, __n); }
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static size_t
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length(const char_type* __s)
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{ return wcslen(__s); }
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static const char_type*
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find(const char_type* __s, size_t __n, const char_type& __a)
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{ return wmemchr(__s, __a, __n); }
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static char_type*
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move(char_type* __s1, const char_type* __s2, size_t __n)
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{ return wmemmove(__s1, __s2, __n); }
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static char_type*
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copy(char_type* __s1, const char_type* __s2, size_t __n)
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{ return wmemcpy(__s1, __s2, __n); }
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static char_type*
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assign(char_type* __s, size_t __n, char_type __a)
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{ return wmemset(__s, __a, __n); }
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static _GLIBCXX_CONSTEXPR char_type
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to_char_type(const int_type& __c) _GLIBCXX_NOEXCEPT
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{ return char_type(__c); }
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static _GLIBCXX_CONSTEXPR int_type
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to_int_type(const char_type& __c) _GLIBCXX_NOEXCEPT
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{ return int_type(__c); }
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static _GLIBCXX_CONSTEXPR bool
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eq_int_type(const int_type& __c1, const int_type& __c2) _GLIBCXX_NOEXCEPT
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{ return __c1 == __c2; }
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static _GLIBCXX_CONSTEXPR int_type
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eof() _GLIBCXX_NOEXCEPT
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{ return static_cast<int_type>(WEOF); }
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static _GLIBCXX_CONSTEXPR int_type
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not_eof(const int_type& __c) _GLIBCXX_NOEXCEPT
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{ return eq_int_type(__c, eof()) ? 0 : __c; }
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};
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#endif //_GLIBCXX_USE_WCHAR_T
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#if ((__cplusplus >= 201103L) \
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&& defined(_GLIBCXX_USE_C99_STDINT_TR1))
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#include <cstdint>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<>
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struct char_traits<char16_t>
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{
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typedef char16_t char_type;
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typedef uint_least16_t int_type;
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typedef streamoff off_type;
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typedef u16streampos pos_type;
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typedef mbstate_t state_type;
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static void
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assign(char_type& __c1, const char_type& __c2) noexcept
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{ __c1 = __c2; }
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static constexpr bool
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eq(const char_type& __c1, const char_type& __c2) noexcept
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{ return __c1 == __c2; }
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static constexpr bool
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lt(const char_type& __c1, const char_type& __c2) noexcept
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{ return __c1 < __c2; }
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static int
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compare(const char_type* __s1, const char_type* __s2, size_t __n)
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{
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for (size_t __i = 0; __i < __n; ++__i)
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if (lt(__s1[__i], __s2[__i]))
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return -1;
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else if (lt(__s2[__i], __s1[__i]))
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return 1;
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return 0;
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}
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static size_t
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length(const char_type* __s)
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{
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size_t __i = 0;
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while (!eq(__s[__i], char_type()))
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++__i;
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return __i;
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}
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static const char_type*
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find(const char_type* __s, size_t __n, const char_type& __a)
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{
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for (size_t __i = 0; __i < __n; ++__i)
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if (eq(__s[__i], __a))
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return __s + __i;
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return 0;
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}
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static char_type*
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move(char_type* __s1, const char_type* __s2, size_t __n)
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{
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return (static_cast<char_type*>
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(__builtin_memmove(__s1, __s2, __n * sizeof(char_type))));
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}
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static char_type*
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copy(char_type* __s1, const char_type* __s2, size_t __n)
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{
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return (static_cast<char_type*>
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(__builtin_memcpy(__s1, __s2, __n * sizeof(char_type))));
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}
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static char_type*
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assign(char_type* __s, size_t __n, char_type __a)
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{
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for (size_t __i = 0; __i < __n; ++__i)
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assign(__s[__i], __a);
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return __s;
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}
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static constexpr char_type
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to_char_type(const int_type& __c) noexcept
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{ return char_type(__c); }
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static constexpr int_type
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to_int_type(const char_type& __c) noexcept
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{ return int_type(__c); }
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static constexpr bool
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eq_int_type(const int_type& __c1, const int_type& __c2) noexcept
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{ return __c1 == __c2; }
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static constexpr int_type
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eof() noexcept
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{ return static_cast<int_type>(-1); }
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static constexpr int_type
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not_eof(const int_type& __c) noexcept
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{ return eq_int_type(__c, eof()) ? 0 : __c; }
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};
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template<>
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struct char_traits<char32_t>
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{
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typedef char32_t char_type;
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typedef uint_least32_t int_type;
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typedef streamoff off_type;
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typedef u32streampos pos_type;
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typedef mbstate_t state_type;
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static void
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assign(char_type& __c1, const char_type& __c2) noexcept
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{ __c1 = __c2; }
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static constexpr bool
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eq(const char_type& __c1, const char_type& __c2) noexcept
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{ return __c1 == __c2; }
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static constexpr bool
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lt(const char_type& __c1, const char_type& __c2) noexcept
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{ return __c1 < __c2; }
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static int
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compare(const char_type* __s1, const char_type* __s2, size_t __n)
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{
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for (size_t __i = 0; __i < __n; ++__i)
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if (lt(__s1[__i], __s2[__i]))
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return -1;
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else if (lt(__s2[__i], __s1[__i]))
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return 1;
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return 0;
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}
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static size_t
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length(const char_type* __s)
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|
{
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size_t __i = 0;
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while (!eq(__s[__i], char_type()))
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++__i;
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return __i;
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}
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static const char_type*
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find(const char_type* __s, size_t __n, const char_type& __a)
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{
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for (size_t __i = 0; __i < __n; ++__i)
|
|
if (eq(__s[__i], __a))
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return __s + __i;
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return 0;
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}
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static char_type*
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move(char_type* __s1, const char_type* __s2, size_t __n)
|
|
{
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|
return (static_cast<char_type*>
|
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(__builtin_memmove(__s1, __s2, __n * sizeof(char_type))));
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|
}
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|
|
static char_type*
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|
copy(char_type* __s1, const char_type* __s2, size_t __n)
|
|
{
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|
return (static_cast<char_type*>
|
|
(__builtin_memcpy(__s1, __s2, __n * sizeof(char_type))));
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|
}
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|
|
|
static char_type*
|
|
assign(char_type* __s, size_t __n, char_type __a)
|
|
{
|
|
for (size_t __i = 0; __i < __n; ++__i)
|
|
assign(__s[__i], __a);
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|
return __s;
|
|
}
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|
|
|
static constexpr char_type
|
|
to_char_type(const int_type& __c) noexcept
|
|
{ return char_type(__c); }
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|
|
|
static constexpr int_type
|
|
to_int_type(const char_type& __c) noexcept
|
|
{ return int_type(__c); }
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|
|
|
static constexpr bool
|
|
eq_int_type(const int_type& __c1, const int_type& __c2) noexcept
|
|
{ return __c1 == __c2; }
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|
|
static constexpr int_type
|
|
eof() noexcept
|
|
{ return static_cast<int_type>(-1); }
|
|
|
|
static constexpr int_type
|
|
not_eof(const int_type& __c) noexcept
|
|
{ return eq_int_type(__c, eof()) ? 0 : __c; }
|
|
};
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif
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|
|
#endif // _CHAR_TRAITS_H
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