1// std::collate implementation details, generic version -*- C++ -*-
2
3// Copyright (C) 2001-2015 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 3, 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// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23// <http://www.gnu.org/licenses/>.
24
25//
26// ISO C++ 14882: 22.2.4.1.2  collate virtual functions
27//
28
29// Written by Benjamin Kosnik <bkoz@redhat.com>
30
31#include <locale>
32#include <cstring>
33
34namespace std _GLIBCXX_VISIBILITY(default)
35{
36_GLIBCXX_BEGIN_NAMESPACE_VERSION
37
38  // These are basically extensions to char_traits, and perhaps should
39  // be put there instead of here.
40  template<>
41    int
42    collate<char>::_M_compare(const char* __one,
43			      const char* __two) const throw()
44    {
45      int __cmp = strcoll(__one, __two);
46      return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
47    }
48
49  template<>
50    size_t
51    collate<char>::_M_transform(char* __to, const char* __from,
52				size_t __n) const throw()
53    { return strxfrm(__to, __from, __n); }
54
55#ifdef _GLIBCXX_USE_WCHAR_T
56  template<>
57    int
58    collate<wchar_t>::_M_compare(const wchar_t* __one,
59				 const wchar_t* __two) const throw()
60    {
61      int __cmp = wcscoll(__one, __two);
62      return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
63    }
64
65  template<>
66    size_t
67    collate<wchar_t>::_M_transform(wchar_t* __to, const wchar_t* __from,
68				   size_t __n) const throw()
69    { return wcsxfrm(__to, __from, __n); }
70#endif
71
72_GLIBCXX_END_NAMESPACE_VERSION
73} // namespace
74