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

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