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, 2007, 2009
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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
00018 // permissions described in the GCC Runtime Library Exception, version
00019 // 3.1, as published by the Free Software Foundation.
00020 
00021 // You should have received a copy of the GNU General Public License and
00022 // a copy of the GCC Runtime Library Exception along with this program;
00023 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00024 // <http://www.gnu.org/licenses/>.
00025 
00026 /** @file c++locale.h
00027  *  This is an internal header file, included by other library headers.
00028  *  You should not attempt to use it directly.
00029  */
00030 
00031 //
00032 // ISO C++ 14882: 22.8  Standard locale categories.
00033 //
00034 
00035 // Written by Benjamin Kosnik <bkoz@redhat.com>
00036 
00037 #ifndef _GLIBCXX_CXX_LOCALE_H
00038 #define _GLIBCXX_CXX_LOCALE_H 1
00039 
00040 #pragma GCC system_header
00041 
00042 #include <clocale>
00043 #include <cstddef>
00044 
00045 #define _GLIBCXX_C_LOCALE_GNU 1
00046 
00047 #define _GLIBCXX_NUM_CATEGORIES 6
00048 
00049 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
00050 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
00051 
00052   extern "C" __typeof(uselocale) __uselocale;
00053 
00054 _GLIBCXX_END_NAMESPACE
00055 #endif
00056 
00057 _GLIBCXX_BEGIN_NAMESPACE(std)
00058 
00059   typedef __locale_t        __c_locale;
00060 
00061   // Convert numeric value of type double and long double to string and
00062   // return length of string.  If vsnprintf is available use it, otherwise
00063   // fall back to the unsafe vsprintf which, in general, can be dangerous
00064   // and should be avoided.
00065   inline int
00066   __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
00067            char* __out,
00068            const int __size __attribute__ ((__unused__)),
00069            const char* __fmt, ...)
00070   {
00071 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
00072     __c_locale __old = __gnu_cxx::__uselocale(__cloc);
00073 #else
00074     char* __old = std::setlocale(LC_NUMERIC, NULL);
00075     char* __sav = NULL;
00076     if (__builtin_strcmp(__old, "C"))
00077       {
00078     const size_t __len = __builtin_strlen(__old) + 1;
00079     __sav = new char[__len];
00080     __builtin_memcpy(__sav, __old, __len);
00081     std::setlocale(LC_NUMERIC, "C");
00082       }
00083 #endif
00084 
00085     __builtin_va_list __args;
00086     __builtin_va_start(__args, __fmt);
00087 
00088 #ifdef _GLIBCXX_USE_C99
00089     const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
00090 #else
00091     const int __ret = __builtin_vsprintf(__out, __fmt, __args);
00092 #endif
00093 
00094     __builtin_va_end(__args);
00095 
00096 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
00097     __gnu_cxx::__uselocale(__old);
00098 #else
00099     if (__sav)
00100       {
00101     std::setlocale(LC_NUMERIC, __sav);
00102     delete [] __sav;
00103       }
00104 #endif
00105     return __ret;
00106   }
00107 
00108 _GLIBCXX_END_NAMESPACE
00109 
00110 #endif

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