c++locale.h

00001 // Wrapper for underlying C-language localization -*- C++ -*-
00002 
00003 // Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 //
00031 // ISO C++ 14882: 22.8  Standard locale categories.
00032 //
00033 
00034 // Written by Benjamin Kosnik <bkoz@redhat.com>
00035 
00036 #ifndef _C_LOCALE_H
00037 #define _C_LOCALE_H 1
00038 
00039 #pragma GCC system_header
00040 
00041 #include <clocale>
00042 #include <cstring>   // get std::strlen
00043 #include <cstdio>    // get std::snprintf or std::sprintf
00044 
00045 #define _GLIBCXX_NUM_CATEGORIES 0
00046 
00047 namespace std
00048 {
00049   typedef int*          __c_locale;
00050 
00051   // Convert numeric value of type _Tv to string and return length of
00052   // string.  If snprintf is available use it, otherwise fall back to
00053   // the unsafe sprintf which, in general, can be dangerous and should
00054   // be avoided.
00055   template<typename _Tv>
00056     int
00057     __convert_from_v(char* __out, 
00058              const int __size __attribute__((__unused__)),
00059              const char* __fmt,
00060              _Tv __v, const __c_locale&, int __prec)
00061     {
00062       char* __old = std::setlocale(LC_NUMERIC, NULL);
00063       char* __sav = NULL;
00064       if (std::strcmp(__old, "C"))
00065     {
00066       __sav = new char[std::strlen(__old) + 1];
00067       std::strcpy(__sav, __old);
00068       std::setlocale(LC_NUMERIC, "C");
00069     }
00070 
00071 #ifdef _GLIBCXX_USE_C99
00072       const int __ret = std::snprintf(__out, __size, __fmt, __prec, __v);
00073 #else
00074       const int __ret = std::sprintf(__out, __fmt, __prec, __v);
00075 #endif
00076       
00077       if (__sav)
00078     {
00079       std::setlocale(LC_NUMERIC, __sav);
00080       delete [] __sav;
00081     }
00082       return __ret;
00083     }
00084 }
00085 
00086 #endif

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