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

   1 // std::collate implementation details, GNU version -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  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 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 }