1// std::collate implementation details, GNU 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#include <bits/c++locale_internal.h>
38
39_GLIBCXX_BEGIN_NAMESPACE(std)
40
41  // These are basically extensions to char_traits, and perhaps should
42  // be put there instead of here.
43  template<>
44    int
45    collate<char>::_M_compare(const char* __one, const char* __two) const
46    {
47      int __cmp = __strcoll_l(__one, __two, _M_c_locale_collate);
48      return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
49    }
50
51  template<>
52    size_t
53    collate<char>::_M_transform(char* __to, const char* __from,
54				size_t __n) const
55    { return __strxfrm_l(__to, __from, __n, _M_c_locale_collate); }
56
57#ifdef _GLIBCXX_USE_WCHAR_T
58  template<>
59    int
60    collate<wchar_t>::_M_compare(const wchar_t* __one,
61				 const wchar_t* __two) const
62    {
63      int __cmp = __wcscoll_l(__one, __two, _M_c_locale_collate);
64      return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
65    }
66
67  template<>
68    size_t
69    collate<wchar_t>::_M_transform(wchar_t* __to, const wchar_t* __from,
70				   size_t __n) const
71    { return __wcsxfrm_l(__to, __from, __n, _M_c_locale_collate); }
72#endif
73
74_GLIBCXX_END_NAMESPACE
75