329 lines
9.3 KiB
C++
329 lines
9.3 KiB
C++
// Character Traits for use by standard string and iostream -*- C++ -*-
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// Copyright (C) 1997-1999, 2000 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 2, 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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//
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// ISO C++ 14882: 21 Strings library
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//
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#ifndef _CPP_BITS_CHAR_TRAITS_H
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#define _CPP_BITS_CHAR_TRAITS_H 1
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#include <bits/std_cwchar.h> // For mbstate_t.
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#include <bits/std_cstring.h> // For memmove, memset, memchr
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#include <bits/fpos.h> // For streamoff, streamsize
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namespace std {
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// Same as iosfwd
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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// Can't have self-recursive types for streampos.
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// 21.1.3.1 char_traits sets size_type to streampos
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// 27.4.1
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// And here, where streampos is typedefed to fpos<traits::state_type>
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typedef fpos<mbstate_t> streampos;
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# ifdef _GLIBCPP_USE_WCHAR_T
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typedef fpos<mbstate_t> wstreampos;
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# endif
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#endif
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// 21.1.2 Basis for explicit _Traits specialization
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// NB: That for any given actual character type this definition is
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// probably wrong.
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template<class _CharT>
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struct char_traits
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{
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typedef _CharT char_type;
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// Unsigned as wint_t in unsigned.
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typedef unsigned long 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)
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{ __c1 = __c2; }
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static 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 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, size_t __n)
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{
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for (size_t __i = 0; __i < __n; ++__i)
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if (!eq(__s1[__i],__s2[__i]))
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return lt(__s1[__i],__s2[__i]) ? -1 : 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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const char_type* __p = __s;
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while (*__p) ++__p;
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return (__p - __s);
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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 (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
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if (*__p == __a) return __p;
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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 (char_type*) memmove(__s1, __s2, __n * sizeof(char_type)); }
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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 (char_type*) memcpy(__s1, __s2, __n * sizeof(char_type)); }
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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 (char_type* __p = __s; __p < __s + __n; ++__p)
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assign(*__p, __a);
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return __s;
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}
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static char_type
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to_char_type(const int_type& __c)
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{ return char_type(__c); }
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static int_type
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to_int_type(const char_type& __c) { return int_type(__c); }
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static 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 state_type
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get_state (pos_type __pos) { return __pos.state(); }
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static int_type
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eof() { return static_cast<int_type>(-1); }
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static int_type
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eos() { return int_type(); }
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static int_type
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not_eof(const int_type& __c)
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{ return eq_int_type(__c, eof()) ? int_type(0) : __c; }
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};
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// 21.1.4 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 unsigned 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)
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{ __c1 = __c2; }
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static 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 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, size_t __n)
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{ return 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 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<char*>(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*>(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*>(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*>(memset(__s, __a, __n)); }
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static char_type
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to_char_type(const int_type& __c)
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{ return static_cast<char>(__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 int_type
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to_int_type(const char_type& __c)
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{ return static_cast<int_type>(static_cast<unsigned char>(__c)); }
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static 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 state_type
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get_state(pos_type __pos) { return __pos.state(); }
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static int_type
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eof() { return static_cast<int_type>(EOF); }
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static int_type
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eos() { return '\0'; }
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static int_type
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not_eof(const int_type& __c)
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{ return (__c == eof()) ? 0 : __c; }
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};
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#ifdef _GLIBCPP_USE_WCHAR_T
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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 wstreamoff 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)
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{ __c1 = __c2; }
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static 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 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, size_t __n)
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{
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for (size_t __i = 0; __i < __n; ++__i)
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if (!eq(__s1[__i], __s2[__i]))
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return lt(__s1[__i], __s2[__i]) ? -1 : 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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const char_type* __p = __s;
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while (*__p)
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++__p;
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return (__p - __s);
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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 (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
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if (*__p == __a)
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return __p;
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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, int_type __n)
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{ return static_cast<wchar_t*>(memmove(__s1, __s2,
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__n * sizeof(wchar_t))); }
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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<wchar_t*>(memcpy(__s1, __s2,
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__n * sizeof(wchar_t))); }
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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 (char_type* __p = __s; __p < __s + __n; ++__p)
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assign(*__p, __a);
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return __s;
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}
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static char_type
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to_char_type(const int_type& __c) { return char_type(__c); }
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static int_type
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to_int_type(const char_type& __c) { return int_type(__c); }
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static 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 state_type
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get_state(pos_type __pos) { return __pos.state(); }
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static int_type
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eof() { return static_cast<int_type>(WEOF); }
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static int_type
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eos() { return int_type(); }
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static int_type
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not_eof(const int_type& __c)
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{ return eq_int_type(__c, eof()) ? 0 : __c; }
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};
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#endif //_GLIBCPP_USE_WCHAR_T
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template<typename _CharT, typename _Traits>
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struct _Char_traits_match
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{
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_CharT _M_c;
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_Char_traits_match(_CharT const& __c) : _M_c(__c) { }
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bool
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operator()(_CharT const& __a) { return _Traits::eq(_M_c,__a); }
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};
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} // namespace std
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#endif /* _CPP_BITS_CHAR_TRAITS_H */
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