1  // std::collate implementation details, generic version -*- C++ -*-
 2  
 3  // Copyright (C) 2001, 2002, 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  //
31  // ISO C++ 14882: 22.2.4.1.2  collate virtual functions
32  //
33  
34  // Written by Benjamin Kosnik <bkoz@redhat.com>
35  
36  #include <locale>
37  
38  _GLIBCXX_BEGIN_NAMESPACE(std)
39  
40    // These are basically extensions to char_traits, and perhaps should
41    // be put there instead of here.
42    template<>
43      int 
44      collate<char>::_M_compare(const char* __one, const char* __two) const
45      { 
46        int __cmp = strcoll(__one, __two);
47        return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
48      }
49    
50    template<>
51      size_t
52      collate<char>::_M_transform(char* __to, const char* __from, 
53  				size_t __n) const
54      { return strxfrm(__to, __from, __n); }
55  
56  #ifdef _GLIBCXX_USE_WCHAR_T
57    template<>
58      int 
59      collate<wchar_t>::_M_compare(const wchar_t* __one, 
60  				 const wchar_t* __two) const
61      {
62        int __cmp = wcscoll(__one, __two);
63        return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
64      }
65    
66    template<>
67      size_t
68      collate<wchar_t>::_M_transform(wchar_t* __to, const wchar_t* __from,
69  				   size_t __n) const
70      { return wcsxfrm(__to, __from, __n); }
71  #endif
72  
73  _GLIBCXX_END_NAMESPACE