00001 // Wrapper for underlying C-language localization -*- C++ -*- 00002 00003 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 00004 // Free Software Foundation, Inc. 00005 // 00006 // This file is part of the GNU ISO C++ Library. This library is free 00007 // software; you can redistribute it and/or modify it under the 00008 // terms of the GNU General Public License as published by the 00009 // Free Software Foundation; either version 2, or (at your option) 00010 // any later version. 00011 00012 // This library is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 00017 // You should have received a copy of the GNU General Public License along 00018 // with this library; see the file COPYING. If not, write to the Free 00019 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 00020 // USA. 00021 00022 // As a special exception, you may use this file as part of a free software 00023 // library without restriction. Specifically, if other files instantiate 00024 // templates or use macros or inline functions from this file, or you compile 00025 // this file and link it with other files to produce an executable, this 00026 // file does not by itself cause the resulting executable to be covered by 00027 // the GNU General Public License. This exception does not however 00028 // invalidate any other reasons why the executable file might be covered by 00029 // the GNU General Public License. 00030 00031 /** @file c++locale.h 00032 * This is an internal header file, included by other library headers. 00033 * You should not attempt to use it directly. 00034 */ 00035 00036 // 00037 // ISO C++ 14882: 22.8 Standard locale categories. 00038 // 00039 00040 // Written by Benjamin Kosnik <bkoz@redhat.com> 00041 00042 #ifndef _C_LOCALE_H 00043 #define _C_LOCALE_H 1 00044 00045 #pragma GCC system_header 00046 00047 #include <clocale> 00048 #include <cstring> // get std::strlen 00049 #include <cstdio> // get std::vsnprintf or std::vsprintf 00050 #include <cstdarg> 00051 00052 #define _GLIBCXX_NUM_CATEGORIES 0 00053 00054 _GLIBCXX_BEGIN_NAMESPACE(std) 00055 00056 typedef int* __c_locale; 00057 00058 // Convert numeric value of type double and long double to string and 00059 // return length of string. If vsnprintf is available use it, otherwise 00060 // fall back to the unsafe vsprintf which, in general, can be dangerous 00061 // and should be avoided. 00062 inline int 00063 __convert_from_v(const __c_locale&, char* __out, 00064 const int __size __attribute__((__unused__)), 00065 const char* __fmt, ...) 00066 { 00067 char* __old = std::setlocale(LC_NUMERIC, NULL); 00068 char* __sav = NULL; 00069 if (std::strcmp(__old, "C")) 00070 { 00071 __sav = new char[std::strlen(__old) + 1]; 00072 std::strcpy(__sav, __old); 00073 std::setlocale(LC_NUMERIC, "C"); 00074 } 00075 00076 va_list __args; 00077 va_start(__args, __fmt); 00078 00079 #ifdef _GLIBCXX_USE_C99 00080 const int __ret = std::vsnprintf(__out, __size, __fmt, __args); 00081 #else 00082 const int __ret = std::vsprintf(__out, __fmt, __args); 00083 #endif 00084 00085 va_end(__args); 00086 00087 if (__sav) 00088 { 00089 std::setlocale(LC_NUMERIC, __sav); 00090 delete [] __sav; 00091 } 00092 return __ret; 00093 } 00094 00095 _GLIBCXX_END_NAMESPACE 00096 00097 #endif