locale.cc revision 132720 
1// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
2// Free Software Foundation, Inc.
3//
4// This file is part of the GNU ISO C++ Library.  This library is free
5// software; you can redistribute it and/or modify it under the
6// terms of the GNU General Public License as published by the
7// Free Software Foundation; either version 2, or (at your option)
8// any later version.
9
10// This library is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13// GNU General Public License for more details.
14
15// You should have received a copy of the GNU General Public License along
16// with this library; see the file COPYING.  If not, write to the Free
17// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
18// USA.
19
20// As a special exception, you may use this file as part of a free software
21// library without restriction.  Specifically, if other files instantiate
22// templates or use macros or inline functions from this file, or you compile
23// this file and link it with other files to produce an executable, this
24// file does not by itself cause the resulting executable to be covered by
25// the GNU General Public License.  This exception does not however
26// invalidate any other reasons why the executable file might be covered by
27// the GNU General Public License.
28
29#include <clocale>
30#include <cstring>
31#include <cstdlib>     // For getenv
32#include <cctype>
33#include <cwctype>     // For towupper, etc.
34#include <locale>
35#include <bits/atomicity.h>
36
37namespace std
38{
39  // Definitions for static const data members of locale.
40  const locale::category 	locale::none;
41  const locale::category 	locale::ctype;
42  const locale::category 	locale::numeric;
43  const locale::category 	locale::collate;
44  const locale::category 	locale::time;
45  const locale::category 	locale::monetary;
46  const locale::category 	locale::messages;
47  const locale::category 	locale::all;
48
49  // These are no longer exported.
50  locale::_Impl*                locale::_S_classic;
51  locale::_Impl* 		locale::_S_global;
52  const size_t 			locale::_S_categories_size;
53
54#ifdef __GTHREADS
55  __gthread_once_t 		locale::_S_once = __GTHREAD_ONCE_INIT;
56#endif
57
58  locale::locale(const locale& __other) throw()
59  : _M_impl(__other._M_impl)
60  { _M_impl->_M_add_reference(); }
61
62  // This is used to initialize global and classic locales, and
63  // assumes that the _Impl objects are constructed correctly.
64  // The lack of a reference increment is intentional.
65  locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
66  { }
67
68  locale::~locale() throw()
69  { _M_impl->_M_remove_reference(); }
70
71  bool
72  locale::operator==(const locale& __rhs) const throw()
73  {
74    bool __ret = false;
75    if (_M_impl == __rhs._M_impl)
76      __ret = true;
77    else
78      {
79	const string __name = this->name();
80	if (__name != "*" && __name == __rhs.name())
81	  __ret = true;
82      }
83    return __ret;
84  }
85
86  const locale&
87  locale::operator=(const locale& __other) throw()
88  {
89    __other._M_impl->_M_add_reference();
90    _M_impl->_M_remove_reference();
91    _M_impl = __other._M_impl;
92    return *this;
93  }
94
95  string
96  locale::name() const
97  {
98    string __ret;
99    if (_M_impl->_M_check_same_name())
100      __ret = _M_impl->_M_names[0];
101    else
102      {
103	__ret += _S_categories[0];
104	__ret += '=';
105	__ret += _M_impl->_M_names[0];
106	for (size_t __i = 1; __i < _S_categories_size; ++__i)
107	  {
108	    __ret += ';';
109	    __ret += _S_categories[__i];
110	    __ret += '=';
111	    __ret += _M_impl->_M_names[__i];
112	  }
113      }
114    return __ret;
115  }
116
117  locale::category
118  locale::_S_normalize_category(category __cat)
119  {
120    int __ret = 0;
121    if (__cat == none || (__cat & all) && !(__cat & ~all))
122      __ret = __cat;
123    else
124      {
125	// NB: May be a C-style "LC_ALL" category; convert.
126	switch (__cat)
127	  {
128	  case LC_COLLATE:
129	    __ret = collate;
130	    break;
131	  case LC_CTYPE:
132	    __ret = ctype;
133	    break;
134	  case LC_MONETARY:
135	    __ret = monetary;
136	    break;
137	  case LC_NUMERIC:
138	    __ret = numeric;
139	    break;
140	  case LC_TIME:
141	    __ret = time;
142	    break;
143#ifdef _GLIBCXX_HAVE_LC_MESSAGES
144	  case LC_MESSAGES:
145	    __ret = messages;
146	    break;
147#endif
148	  case LC_ALL:
149	    __ret = all;
150	    break;
151	  default:
152	    __throw_runtime_error(__N("locale::_S_normalize_category "
153				  "category not found"));
154	  }
155      }
156    return __ret;
157  }
158
159  // locale::facet
160  __c_locale locale::facet::_S_c_locale;
161
162  const char locale::facet::_S_c_name[2] = "C";
163
164#ifdef __GTHREADS
165  __gthread_once_t locale::facet::_S_once = __GTHREAD_ONCE_INIT;
166#endif
167
168  void
169  locale::facet::_S_initialize_once()
170  {
171    // Initialize the underlying locale model.
172    _S_create_c_locale(_S_c_locale, _S_c_name);
173  }
174
175  __c_locale
176  locale::facet::_S_get_c_locale()
177  {
178#ifdef __GHTREADS
179    if (__gthread_active_p())
180      __gthread_once(&_S_once, _S_initialize_once);
181    else
182#endif
183      {
184	if (!_S_c_locale)
185	  _S_initialize_once();
186      }
187    return _S_c_locale;
188  }
189
190  const char*
191  locale::facet::_S_get_c_name()
192  { return _S_c_name; }
193
194  locale::facet::
195  ~facet() { }
196
197  // locale::_Impl
198  locale::_Impl::
199  ~_Impl() throw()
200  {
201    if (_M_facets)
202      for (size_t __i = 0; __i < _M_facets_size; ++__i)
203	if (_M_facets[__i])
204	  _M_facets[__i]->_M_remove_reference();
205    delete [] _M_facets;
206
207    if (_M_caches)
208      for (size_t __i = 0; __i < _M_facets_size; ++__i)
209	if (_M_caches[__i])
210	  _M_caches[__i]->_M_remove_reference();
211    delete [] _M_caches;
212
213    if (_M_names)
214      for (size_t __i = 0; __i < _S_categories_size; ++__i)
215	delete [] _M_names[__i];
216    delete [] _M_names;
217  }
218
219  // Clone existing _Impl object.
220  locale::_Impl::
221  _Impl(const _Impl& __imp, size_t __refs)
222  : _M_refcount(__refs), _M_facets(0), _M_facets_size(__imp._M_facets_size),
223  _M_caches(0), _M_names(0)
224  {
225    try
226      {
227	_M_facets = new const facet*[_M_facets_size];
228	for (size_t __i = 0; __i < _M_facets_size; ++__i)
229	  {
230	    _M_facets[__i] = __imp._M_facets[__i];
231	    if (_M_facets[__i])
232	      _M_facets[__i]->_M_add_reference();
233	  }
234	_M_caches = new const facet*[_M_facets_size];
235	for (size_t __j = 0; __j < _M_facets_size; ++__j)
236	  {
237	    _M_caches[__j] = __imp._M_caches[__j];
238	    if (_M_caches[__j])
239	      _M_caches[__j]->_M_add_reference();
240	  }
241	_M_names = new char*[_S_categories_size];
242	for (size_t __k = 0; __k < _S_categories_size; ++__k)
243	  _M_names[__k] = 0;
244
245	// Name all the categories.
246	for (size_t __l = 0; __l < _S_categories_size; ++__l)
247	  {
248	    char* __new = new char[std::strlen(__imp._M_names[__l]) + 1];
249	    std::strcpy(__new, __imp._M_names[__l]);
250	    _M_names[__l] = __new;
251	  }
252      }
253    catch(...)
254      {
255	this->~_Impl();
256	__throw_exception_again;
257      }
258  }
259
260  void
261  locale::_Impl::
262  _M_replace_category(const _Impl* __imp,
263		      const locale::id* const* __idpp)
264  {
265    for (; *__idpp; ++__idpp)
266      _M_replace_facet(__imp, *__idpp);
267  }
268
269  void
270  locale::_Impl::
271  _M_replace_facet(const _Impl* __imp, const locale::id* __idp)
272  {
273    size_t __index = __idp->_M_id();
274    if ((__index > (__imp->_M_facets_size - 1))
275	|| !__imp->_M_facets[__index])
276      __throw_runtime_error(__N("locale::_Impl::_M_replace_facet"));
277    _M_install_facet(__idp, __imp->_M_facets[__index]);
278  }
279
280  void
281  locale::_Impl::
282  _M_install_facet(const locale::id* __idp, const facet* __fp)
283  {
284    if (__fp)
285      {
286	size_t __index = __idp->_M_id();
287
288	// Check size of facet vector to ensure adequate room.
289	if (__index > _M_facets_size - 1)
290	  {
291	    const size_t __new_size = __index + 4;
292
293	    // New facet array.
294	    const facet** __oldf = _M_facets;
295	    const facet** __newf;
296	    __newf = new const facet*[__new_size];
297	    for (size_t __i = 0; __i < _M_facets_size; ++__i)
298	      __newf[__i] = _M_facets[__i];
299	    for (size_t __l = _M_facets_size; __l < __new_size; ++__l)
300	      __newf[__l] = 0;
301
302	    // New cache array.
303	    const facet** __oldc = _M_caches;
304	    const facet** __newc;
305	    try
306	      {
307		__newc = new const facet*[__new_size];
308	      }
309	    catch(...)
310	      {
311		delete [] __newf;
312		__throw_exception_again;
313	      }
314	    for (size_t __j = 0; __j < _M_facets_size; ++__j)
315	      __newc[__j] = _M_caches[__j];
316	    for (size_t __k = _M_facets_size; __k < __new_size; ++__k)
317	      __newc[__k] = 0;
318
319	    _M_facets_size = __new_size;
320	    _M_facets = __newf;
321	    _M_caches = __newc;
322	    delete [] __oldf;
323	    delete [] __oldc;
324	  }
325
326	__fp->_M_add_reference();
327	const facet*& __fpr = _M_facets[__index];
328	if (__fpr)
329	  {
330	    // Replacing an existing facet. Order matters.
331	    __fpr->_M_remove_reference();
332	    __fpr = __fp;
333	  }
334	else
335	  {
336	    // Installing a newly created facet into an empty
337	    // _M_facets container, say a newly-constructed,
338	    // swanky-fresh _Impl.
339	    _M_facets[__index] = __fp;
340	  }
341
342	// Ideally, it would be nice to only remove the caches that
343	// are now incorrect. However, some of the caches depend on
344	// multiple facets, and we only know about one facet
345	// here. It's no great loss: the first use of the new facet
346	// will create a new, correctly cached facet anyway.
347	for (size_t __i = 0; __i < _M_facets_size; ++__i)
348	  {
349	    const facet* __cpr = _M_caches[__i];
350	    if (__cpr)
351	      {
352		__cpr->_M_remove_reference();
353		_M_caches[__i] = 0;
354	      }
355	  }
356      }
357  }
358
359
360  // locale::id
361  // Definitions for static const data members of locale::id
362  _Atomic_word locale::id::_S_refcount;  // init'd to 0 by linker
363
364  size_t
365  locale::id::_M_id() const
366  {
367    if (!_M_index)
368      _M_index = 1 + __gnu_cxx::__exchange_and_add(&_S_refcount, 1);
369    return _M_index - 1;
370  }
371} // namespace std
372
373
374