1 // std::collate implementation details, generic version -*- C++ -*- 2 3 // Copyright (C) 2001-2017 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 <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 _M_compare(const char * __one,const char * __two) const42 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 _M_transform(char * __to,const char * __from,size_t __n) const51 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 _M_compare(const wchar_t * __one,const wchar_t * __two) const58 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 _M_transform(wchar_t * __to,const wchar_t * __from,size_t __n) const67 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