1// POD character, std::char_traits specialization -*- C++ -*-
2
3// Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 2, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14// GNU General Public License for more details.
15
16// You should have received a copy of the GNU General Public License along
17// with this library; see the file COPYING.  If not, write to the Free
18// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19// USA.
20
21// As a special exception, you may use this file as part of a free software
22// library without restriction.  Specifically, if other files instantiate
23// templates or use macros or inline functions from this file, or you compile
24// this file and link it with other files to produce an executable, this
25// file does not by itself cause the resulting executable to be covered by
26// the GNU General Public License.  This exception does not however
27// invalidate any other reasons why the executable file might be covered by
28// the GNU General Public License.
29
30/** @file ext/pod_char_traits.h
31 *  This file is a GNU extension to the Standard C++ Library.
32 */
33
34// Gabriel Dos Reis <gdr@integrable-solutions.net>
35// Benjamin Kosnik <bkoz@redhat.com>
36
37#ifndef _POD_CHAR_TRAITS_H
38#define _POD_CHAR_TRAITS_H 1
39
40#include <string>
41
42_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
43
44  // POD character abstraction.
45  // NB: The char_type parameter is a subset of int_type, as to allow
46  // int_type to properly hold the full range of char_type values as
47  // well as EOF.
48  /// @brief A POD class that serves as a character abstraction class.
49  template<typename V, typename I, typename S = mbstate_t>
50    struct character
51    {
52      typedef V				value_type;
53      typedef I				int_type;
54      typedef S				state_type;
55      typedef character<V, I, S>	char_type;
56
57      value_type	value;
58
59      template<typename V2>
60        static char_type
61        from(const V2& v)
62        {
63	  char_type ret = { static_cast<value_type>(v) };
64	  return ret;
65	}
66
67      template<typename V2>
68        static V2
69        to(const char_type& c)
70        {
71	  V2 ret = { static_cast<V2>(c.value) };
72	  return ret;
73	}
74
75    };
76
77  template<typename V, typename I, typename S>
78    inline bool
79    operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs)
80    { return lhs.value == rhs.value; }
81
82  template<typename V, typename I, typename S>
83    inline bool
84    operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs)
85    { return lhs.value < rhs.value; }
86
87_GLIBCXX_END_NAMESPACE
88
89_GLIBCXX_BEGIN_NAMESPACE(std)
90
91  /// char_traits<__gnu_cxx::character> specialization.
92  template<typename V, typename I, typename S>
93    struct char_traits<__gnu_cxx::character<V, I, S> >
94    {
95      typedef __gnu_cxx::character<V, I, S>	char_type;
96      typedef typename char_type::int_type	int_type;
97      typedef typename char_type::state_type	state_type;
98      typedef fpos<state_type>			pos_type;
99      typedef streamoff				off_type;
100
101      static void
102      assign(char_type& __c1, const char_type& __c2)
103      { __c1 = __c2; }
104
105      static bool
106      eq(const char_type& __c1, const char_type& __c2)
107      { return __c1 == __c2; }
108
109      static bool
110      lt(const char_type& __c1, const char_type& __c2)
111      { return __c1 < __c2; }
112
113      static int
114      compare(const char_type* __s1, const char_type* __s2, size_t __n)
115      {
116	for (size_t __i = 0; __i < __n; ++__i)
117	  if (!eq(__s1[__i], __s2[__i]))
118	    return lt(__s1[__i], __s2[__i]) ? -1 : 1;
119	return 0;
120      }
121
122      static size_t
123      length(const char_type* __s)
124      {
125	const char_type* __p = __s;
126	while (__p->value)
127	  ++__p;
128	return (__p - __s);
129      }
130
131      static const char_type*
132      find(const char_type* __s, size_t __n, const char_type& __a)
133      {
134	for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
135	  if (*__p == __a)
136	    return __p;
137	return 0;
138      }
139
140      static char_type*
141      move(char_type* __s1, const char_type* __s2, size_t __n)
142      {
143	return static_cast<char_type*>(std::memmove(__s1, __s2,
144						    __n * sizeof(char_type)));
145      }
146
147      static char_type*
148      copy(char_type* __s1, const char_type* __s2, size_t __n)
149      {
150	std::copy(__s2, __s2 + __n, __s1);
151	return __s1;
152      }
153
154      static char_type*
155      assign(char_type* __s, size_t __n, char_type __a)
156      {
157	std::fill_n(__s, __n, __a);
158        return __s;
159      }
160
161      static char_type
162      to_char_type(const int_type& __i)
163      { return char_type::template from(__i); }
164
165      static int_type
166      to_int_type(const char_type& __c)
167      { return char_type::template to<int_type>(__c); }
168
169      static bool
170      eq_int_type(const int_type& __c1, const int_type& __c2)
171      { return __c1 == __c2; }
172
173      static int_type
174      eof()
175      {
176	int_type __r = { -1 };
177	return __r;
178      }
179
180      static int_type
181      not_eof(const int_type& __c)
182      { return eq_int_type(__c, eof()) ? int_type() : __c; }
183    };
184
185_GLIBCXX_END_NAMESPACE
186
187#endif
188