1// POD character, std::char_traits specialization -*- C++ -*-
2
3// Copyright (C) 2002, 2003, 2004, 2005, 2007, 2009 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 3, 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// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file ext/pod_char_traits.h
26 *  This file is a GNU extension to the Standard C++ Library.
27 */
28
29// Gabriel Dos Reis <gdr@integrable-solutions.net>
30// Benjamin Kosnik <bkoz@redhat.com>
31
32#ifndef _POD_CHAR_TRAITS_H
33#define _POD_CHAR_TRAITS_H 1
34
35#include <string>
36
37namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
38{
39_GLIBCXX_BEGIN_NAMESPACE_VERSION
40
41  // POD character abstraction.
42  // NB: The char_type parameter is a subset of int_type, as to allow
43  // int_type to properly hold the full range of char_type values as
44  // well as EOF.
45  /// @brief A POD class that serves as a character abstraction class.
46  template<typename V, typename I, typename S = std::mbstate_t>
47    struct character
48    {
49      typedef V				value_type;
50      typedef I				int_type;
51      typedef S				state_type;
52      typedef character<V, I, S>	char_type;
53
54      value_type	value;
55
56      template<typename V2>
57        static char_type
58        from(const V2& v)
59        {
60	  char_type ret = { static_cast<value_type>(v) };
61	  return ret;
62	}
63
64      template<typename V2>
65        static V2
66        to(const char_type& c)
67        {
68	  V2 ret = { static_cast<V2>(c.value) };
69	  return ret;
70	}
71
72    };
73
74  template<typename V, typename I, typename S>
75    inline bool
76    operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs)
77    { return lhs.value == rhs.value; }
78
79  template<typename V, typename I, typename S>
80    inline bool
81    operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs)
82    { return lhs.value < rhs.value; }
83
84_GLIBCXX_END_NAMESPACE_VERSION
85} // namespace
86
87namespace std _GLIBCXX_VISIBILITY(default)
88{
89_GLIBCXX_BEGIN_NAMESPACE_VERSION
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*>
144	  (__builtin_memmove(__s1, __s2, __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_VERSION
186} // namespace
187
188#endif
189