1 // Wrapper for underlying C-language localization -*- C++ -*- 2 3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 2, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // You should have received a copy of the GNU General Public License along 18 // with this library; see the file COPYING. If not, write to the Free 19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 20 // USA. 21 22 // As a special exception, you may use this file as part of a free software 23 // library without restriction. Specifically, if other files instantiate 24 // templates or use macros or inline functions from this file, or you compile 25 // this file and link it with other files to produce an executable, this 26 // file does not by itself cause the resulting executable to be covered by 27 // the GNU General Public License. This exception does not however 28 // invalidate any other reasons why the executable file might be covered by 29 // the GNU General Public License. 30 31 /** @file c++locale.h 32 * This is an internal header file, included by other library headers. 33 * You should not attempt to use it directly. 34 */ 35 36 // 37 // ISO C++ 14882: 22.8 Standard locale categories. 38 // 39 40 // Written by Benjamin Kosnik <bkoz@redhat.com> 41 42 #ifndef _C_LOCALE_H 43 #define _C_LOCALE_H 1 44 45 #pragma GCC system_header 46 47 #include <clocale> 48 #include <cstring> // get std::strlen 49 #include <cstdio> // get std::vsnprintf or std::vsprintf 50 #include <cstdarg> 51 52 #define _GLIBCXX_NUM_CATEGORIES 0 53 54 _GLIBCXX_BEGIN_NAMESPACE(std) 55 56 typedef int* __c_locale; 57 58 // Convert numeric value of type double and long double to string and 59 // return length of string. If vsnprintf is available use it, otherwise 60 // fall back to the unsafe vsprintf which, in general, can be dangerous 61 // and should be avoided. 62 inline int __convert_from_v(const __c_locale &,char * __out,const int __size,const char * __fmt,...)63 __convert_from_v(const __c_locale&, char* __out, 64 const int __size __attribute__((__unused__)), 65 const char* __fmt, ...) 66 { 67 char* __old = std::setlocale(LC_NUMERIC, NULL); 68 char* __sav = NULL; 69 if (std::strcmp(__old, "C")) 70 { 71 size_t __sz = std::strlen(__old) + 1; 72 __sav = new char[__sz]; 73 std::memcpy(__sav, __old, __sz); 74 std::setlocale(LC_NUMERIC, "C"); 75 } 76 77 va_list __args; 78 va_start(__args, __fmt); 79 80 #ifdef _GLIBCXX_USE_C99 81 const int __ret = std::vsnprintf(__out, __size, __fmt, __args); 82 #else 83 const int __ret = std::vsprintf(__out, __fmt, __args); 84 #endif 85 86 va_end(__args); 87 88 if (__sav) 89 { 90 std::setlocale(LC_NUMERIC, __sav); 91 delete [] __sav; 92 } 93 return __ret; 94 } 95 96 _GLIBCXX_END_NAMESPACE 97 98 #endif 99