libstdc++-v3/config/locale/gnu/c_locale.h

   1 // Wrapper for underlying C-language localization -*- C++ -*-
   2
   3 // Copyright (C) 2001-2013 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 /** @file bits/c++locale.h
  26  *  This is an internal header file, included by other library headers.
  27  *  Do not attempt to use it directly. @headername{locale}
  28  */
  29
  30 //
  31 // ISO C++ 14882: 22.8  Standard locale categories.
  32 //
  33
  34 // Written by Benjamin Kosnik <bkoz@redhat.com>
  35
  36 #ifndef _GLIBCXX_CXX_LOCALE_H
  37 #define _GLIBCXX_CXX_LOCALE_H 1
  38
  39 #pragma GCC system_header
  40
  41 #include <clocale>
  42
  43 #define _GLIBCXX_C_LOCALE_GNU 1
  44
  45 #define _GLIBCXX_NUM_CATEGORIES 6
  46
  47 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
  48 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  49 {
  50 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  51
  52   extern "C" __typeof(uselocale) __uselocale;
  53
  54 _GLIBCXX_END_NAMESPACE_VERSION
  55 } // namespace
  56 #endif
  57
  58 namespace std _GLIBCXX_VISIBILITY(default)
  59 {
  60 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  61
  62   typedef __locale_t            __c_locale;
  63
  64   // Convert numeric value of type double and long double to string and
  65   // return length of string.  If vsnprintf is available use it, otherwise
  66   // fall back to the unsafe vsprintf which, in general, can be dangerous
  67   // and should be avoided.
  68   inline int
  69   __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
  70                    char* __out,
  71                    const int __size __attribute__ ((__unused__)),
  72                    const char* __fmt, ...)
  73   {
  74 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
  75     __c_locale __old = __gnu_cxx::__uselocale(__cloc);
  76 #else
  77     char* __old = std::setlocale(LC_NUMERIC, 0);
  78     char* __sav = 0;
  79     if (__builtin_strcmp(__old, "C"))
  80       {
  81         const size_t __len = __builtin_strlen(__old) + 1;
  82         __sav = new char[__len];
  83         __builtin_memcpy(__sav, __old, __len);
  84         std::setlocale(LC_NUMERIC, "C");
  85       }
  86 #endif
  87
  88     __builtin_va_list __args;
  89     __builtin_va_start(__args, __fmt);
  90
  91 #ifdef _GLIBCXX_USE_C99
  92     const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
  93 #else
  94     const int __ret = __builtin_vsprintf(__out, __fmt, __args);
  95 #endif
  96
  97     __builtin_va_end(__args);
  98
  99 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
 100     __gnu_cxx::__uselocale(__old);
 101 #else
 102     if (__sav)
 103       {
 104         std::setlocale(LC_NUMERIC, __sav);
 105         delete [] __sav;
 106       }
 107 #endif
 108     return __ret;
 109   }
 110
 111 _GLIBCXX_END_NAMESPACE_VERSION
 112 } // namespace
 113
 114 #endif