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  1. // Wrapper for underlying C-language localization -*- C++ -*-
  2.  
  3. // Copyright (C) 2001-2015 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_NUM_CATEGORIES 0
  44.  
  45. namespace std _GLIBCXX_VISIBILITY(default)
  46. {
  47. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  48.  
  49.   typedef int*                  __c_locale;
  50.  
  51.   // Convert numeric value of type double and long double to string and
  52.   // return length of string.  If vsnprintf is available use it, otherwise
  53.   // fall back to the unsafe vsprintf which, in general, can be dangerous
  54.   // and should be avoided.
  55.   inline int
  56.   __convert_from_v(const __c_locale&, char* __out,
  57.                    const int __size __attribute__((__unused__)),
  58.                    const char* __fmt, ...)
  59.   {
  60.     char* __old = std::setlocale(LC_NUMERIC, 0);
  61.     char* __sav = 0;
  62.     if (__builtin_strcmp(__old, "C"))
  63.       {
  64.         const size_t __len = __builtin_strlen(__old) + 1;
  65.         __sav = new char[__len];
  66.         __builtin_memcpy(__sav, __old, __len);
  67.         std::setlocale(LC_NUMERIC, "C");
  68.       }
  69.  
  70.     __builtin_va_list __args;
  71.     __builtin_va_start(__args, __fmt);
  72.  
  73. #ifdef _GLIBCXX_USE_C99
  74.     const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
  75. #else
  76.     const int __ret = __builtin_vsprintf(__out, __fmt, __args);
  77. #endif
  78.  
  79.     __builtin_va_end(__args);
  80.  
  81.     if (__sav)
  82.       {
  83.         std::setlocale(LC_NUMERIC, __sav);
  84.         delete [] __sav;
  85.       }
  86.     return __ret;
  87.   }
  88.  
  89. _GLIBCXX_END_NAMESPACE_VERSION
  90. } // namespace
  91.  
  92. #endif
  93.