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
74