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
37_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
38
39  // POD character abstraction.
40  // NB: The char_type parameter is a subset of int_type, as to allow
41  // int_type to properly hold the full range of char_type values as
42  // well as EOF.
43  /// @brief A POD class that serves as a character abstraction class.
44  template<typename V, typename I, typename S = std::mbstate_t>
45    struct character
46    {
47      typedef V				value_type;
48      typedef I				int_type;
49      typedef S				state_type;
50      typedef character<V, I, S>	char_type;
51
52      value_type	value;
53
54      template<typename V2>
55        static char_type
56        from(const V2& v)
57        {
58	  char_type ret = { static_cast<value_type>(v) };
59	  return ret;
60	}
61
62      template<typename V2>
63        static V2
64        to(const char_type& c)
65        {
66	  V2 ret = { static_cast<V2>(c.value) };
67	  return ret;
68	}
69
70    };
71
72  template<typename V, typename I, typename S>
73    inline bool
74    operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs)
75    { return lhs.value == rhs.value; }
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_GLIBCXX_END_NAMESPACE
83
84_GLIBCXX_BEGIN_NAMESPACE(std)
85
86  /// char_traits<__gnu_cxx::character> specialization.
87  template<typename V, typename I, typename S>
88    struct char_traits<__gnu_cxx::character<V, I, S> >
89    {
90      typedef __gnu_cxx::character<V, I, S>	char_type;
91      typedef typename char_type::int_type	int_type;
92      typedef typename char_type::state_type	state_type;
93      typedef fpos<state_type>			pos_type;
94      typedef streamoff				off_type;
95
96      static void
97      assign(char_type& __c1, const char_type& __c2)
98      { __c1 = __c2; }
99
100      static bool
101      eq(const char_type& __c1, const char_type& __c2)
102      { return __c1 == __c2; }
103
104      static bool
105      lt(const char_type& __c1, const char_type& __c2)
106      { return __c1 < __c2; }
107
108      static int
109      compare(const char_type* __s1, const char_type* __s2, size_t __n)
110      {
111	for (size_t __i = 0; __i < __n; ++__i)
112	  if (!eq(__s1[__i], __s2[__i]))
113	    return lt(__s1[__i], __s2[__i]) ? -1 : 1;
114	return 0;
115      }
116
117      static size_t
118      length(const char_type* __s)
119      {
120	const char_type* __p = __s;
121	while (__p->value)
122	  ++__p;
123	return (__p - __s);
124      }
125
126      static const char_type*
127      find(const char_type* __s, size_t __n, const char_type& __a)
128      {
129	for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
130	  if (*__p == __a)
131	    return __p;
132	return 0;
133      }
134
135      static char_type*
136      move(char_type* __s1, const char_type* __s2, size_t __n)
137      {
138	return static_cast<char_type*>
139	  (__builtin_memmove(__s1, __s2, __n * sizeof(char_type)));
140      }
141
142      static char_type*
143      copy(char_type* __s1, const char_type* __s2, size_t __n)
144      {
145	std::copy(__s2, __s2 + __n, __s1);
146	return __s1;
147      }
148
149      static char_type*
150      assign(char_type* __s, size_t __n, char_type __a)
151      {
152	std::fill_n(__s, __n, __a);
153        return __s;
154      }
155
156      static char_type
157      to_char_type(const int_type& __i)
158      { return char_type::template from(__i); }
159
160      static int_type
161      to_int_type(const char_type& __c)
162      { return char_type::template to<int_type>(__c); }
163
164      static bool
165      eq_int_type(const int_type& __c1, const int_type& __c2)
166      { return __c1 == __c2; }
167
168      static int_type
169      eof()
170      {
171	int_type __r = { -1 };
172	return __r;
173      }
174
175      static int_type
176      not_eof(const int_type& __c)
177      { return eq_int_type(__c, eof()) ? int_type() : __c; }
178    };
179
180_GLIBCXX_END_NAMESPACE
181
182#endif
183