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      1 // std::collate implementation details, generic version -*- C++ -*-
      2 
      3 // Copyright (C) 2001-2024 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 (at) redhat.com>
     30 
     31 #include <locale>
     32 #include <cstring>
     33 
     34 namespace 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