codecvt.cc revision 132720 
1// Copyright (C) 2000, 2002, 2004 Free Software Foundation, Inc.
2//
3// This file is part of the GNU ISO C++ Library.  This library is free
4// software; you can redistribute it and/or modify it under the
5// terms of the GNU General Public License as published by the
6// Free Software Foundation; either version 2, or (at your option)
7// any later version.
8
9// This library is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12// GNU General Public License for more details.
13
14// You should have received a copy of the GNU General Public License along
15// with this library; see the file COPYING.  If not, write to the Free
16// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17// USA.
18
19// As a special exception, you may use this file as part of a free software
20// library without restriction.  Specifically, if other files instantiate
21// templates or use macros or inline functions from this file, or you compile
22// this file and link it with other files to produce an executable, this
23// file does not by itself cause the resulting executable to be covered by
24// the GNU General Public License.  This exception does not however
25// invalidate any other reasons why the executable file might be covered by
26// the GNU General Public License.
27
28// Written by Benjamin Kosnik <bkoz@cygnus.com>
29
30#include <locale>
31
32namespace std
33{
34  // Definitions for locale::id of standard facets that are specialized.
35 locale::id codecvt<char, char, mbstate_t>::id;
36
37#ifdef _GLIBCXX_USE_WCHAR_T
38  locale::id codecvt<wchar_t, char, mbstate_t>::id;
39#endif
40
41#ifdef _GLIBCXX_USE___ENC_TRAITS
42  // Definitions for static const data members of __enc_traits.
43  const int __enc_traits::_S_max_size;
44#endif
45
46  codecvt<char, char, mbstate_t>::
47  codecvt(size_t __refs)
48  : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
49  _M_c_locale_codecvt(_S_get_c_locale())
50  { }
51
52  codecvt<char, char, mbstate_t>::
53  codecvt(__c_locale __cloc, size_t __refs)
54  : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
55  _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
56  { }
57
58  codecvt<char, char, mbstate_t>::
59  ~codecvt()
60  { _S_destroy_c_locale(_M_c_locale_codecvt); }
61
62  codecvt_base::result
63  codecvt<char, char, mbstate_t>::
64  do_out(state_type&, const intern_type* __from,
65	 const intern_type*, const intern_type*& __from_next,
66	 extern_type* __to, extern_type*,
67	 extern_type*& __to_next) const
68  {
69    // _GLIBCXX_RESOLVE_LIB_DEFECTS
70    // According to the resolution of DR19, "If returns noconv [...]
71    // there are no changes to the values in [to, to_limit)."
72    __from_next = __from;
73    __to_next = __to;
74    return noconv;
75  }
76
77  codecvt_base::result
78  codecvt<char, char, mbstate_t>::
79  do_unshift(state_type&, extern_type* __to,
80             extern_type*, extern_type*& __to_next) const
81  {
82    __to_next = __to;
83    return noconv;
84  }
85
86  codecvt_base::result
87  codecvt<char, char, mbstate_t>::
88  do_in(state_type&, const extern_type* __from,
89	const extern_type*, const extern_type*& __from_next,
90	intern_type* __to, intern_type*, intern_type*& __to_next) const
91  {
92    // _GLIBCXX_RESOLVE_LIB_DEFECTS
93    // According to the resolution of DR19, "If returns noconv [...]
94    // there are no changes to the values in [to, to_limit)."
95    __from_next = __from;
96    __to_next = __to;
97    return noconv;
98  }
99
100  int
101  codecvt<char, char, mbstate_t>::
102  do_encoding() const throw()
103  { return 1; }
104
105  bool
106  codecvt<char, char, mbstate_t>::
107  do_always_noconv() const throw()
108  { return true; }
109
110  int
111  codecvt<char, char, mbstate_t>::
112  do_length (state_type&, const extern_type* __from,
113	     const extern_type* __end, size_t __max) const
114  {
115    size_t __d = static_cast<size_t>(__end - __from);
116    return std::min(__max, __d);
117  }
118
119  int
120  codecvt<char, char, mbstate_t>::
121  do_max_length() const throw()
122  { return 1; }
123
124#ifdef _GLIBCXX_USE_WCHAR_T
125  // codecvt<wchar_t, char, mbstate_t> required specialization
126  codecvt<wchar_t, char, mbstate_t>::
127  codecvt(size_t __refs)
128  : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
129  _M_c_locale_codecvt(_S_get_c_locale())
130  { }
131
132  codecvt<wchar_t, char, mbstate_t>::
133  codecvt(__c_locale __cloc, size_t __refs)
134  : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
135  _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
136  { }
137
138  codecvt<wchar_t, char, mbstate_t>::
139  ~codecvt()
140  { _S_destroy_c_locale(_M_c_locale_codecvt); }
141
142  codecvt_base::result
143  codecvt<wchar_t, char, mbstate_t>::
144  do_unshift(state_type&, extern_type* __to,
145	     extern_type*, extern_type*& __to_next) const
146  {
147    // XXX Probably wrong for stateful encodings
148    __to_next = __to;
149    return noconv;
150  }
151
152  bool
153  codecvt<wchar_t, char, mbstate_t>::
154  do_always_noconv() const throw()
155  { return false; }
156#endif //  _GLIBCXX_USE_WCHAR_T
157} // namespace std
158