1// std::collate implementation details, generic version -*- C++ -*-
2
3// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
4// Free Software Foundation, Inc.
5//
6// This file is part of the GNU ISO C++ Library.  This library is free
7// software; you can redistribute it and/or modify it under the
8// terms of the GNU General Public License as published by the
9// Free Software Foundation; either version 3, or (at your option)
10// any later version.
11
12// This library is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU General Public License for more details.
16
17// Under Section 7 of GPL version 3, you are granted additional
18// permissions described in the GCC Runtime Library Exception, version
19// 3.1, as published by the Free Software Foundation.
20
21// You should have received a copy of the GNU General Public License and
22// a copy of the GCC Runtime Library Exception along with this program;
23// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24// <http://www.gnu.org/licenses/>.
25
26//
27// ISO C++ 14882: 22.2.4.1.2  collate virtual functions
28//
29
30// Written by Benjamin Kosnik <bkoz@redhat.com>
31
32#include <locale>
33#include <cstring>
34
35_GLIBCXX_BEGIN_NAMESPACE(std)
36
37  // These are basically extensions to char_traits, and perhaps should
38  // be put there instead of here.
39  template<>
40    int
41    collate<char>::_M_compare(const char* __one,
42			      const char* __two) const throw()
43    {
44      int __cmp = strcoll(__one, __two);
45      return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
46    }
47
48  template<>
49    size_t
50    collate<char>::_M_transform(char* __to, const char* __from,
51				size_t __n) const throw()
52    { return strxfrm(__to, __from, __n); }
53
54#ifdef _GLIBCXX_USE_WCHAR_T
55  template<>
56    int
57    collate<wchar_t>::_M_compare(const wchar_t* __one,
58				 const wchar_t* __two) const throw()
59    {
60      int __cmp = wcscoll(__one, __two);
61      return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
62    }
63
64  template<>
65    size_t
66    collate<wchar_t>::_M_transform(wchar_t* __to, const wchar_t* __from,
67				   size_t __n) const throw()
68    { return wcsxfrm(__to, __from, __n); }
69#endif
70
71_GLIBCXX_END_NAMESPACE
72