c++locale.h

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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

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