libstdc++-v3/config/locale/gnu/collate_members.cc

   1 // std::collate implementation details, GNU version -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002, 2005, 2009 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 <bits/c++locale_internal.h>
  33
  34 _GLIBCXX_BEGIN_NAMESPACE(std)
  35
  36   // These are basically extensions to char_traits, and perhaps should
  37   // be put there instead of here.
  38   template<>
  39     int
  40     collate<char>::_M_compare(const char* __one, const char* __two) const
  41     {
  42       int __cmp = __strcoll_l(__one, __two, _M_c_locale_collate);
  43       return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
  44     }
  45
  46   template<>
  47     size_t
  48     collate<char>::_M_transform(char* __to, const char* __from,
  49                                 size_t __n) const
  50     { return __strxfrm_l(__to, __from, __n, _M_c_locale_collate); }
  51
  52 #ifdef _GLIBCXX_USE_WCHAR_T
  53   template<>
  54     int
  55     collate<wchar_t>::_M_compare(const wchar_t* __one,
  56                                  const wchar_t* __two) const
  57     {
  58       int __cmp = __wcscoll_l(__one, __two, _M_c_locale_collate);
  59       return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
  60     }
  61
  62   template<>
  63     size_t
  64     collate<wchar_t>::_M_transform(wchar_t* __to, const wchar_t* __from,
  65                                    size_t __n) const
  66     { return __wcsxfrm_l(__to, __from, __n, _M_c_locale_collate); }
  67 #endif
  68
  69 _GLIBCXX_END_NAMESPACE