1  // Wrapper for underlying C-language localization -*- C++ -*-
       2  
       3  // Copyright (C) 2001-2023 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  #if _GLIBCXX_USE_C99_STDIO && !_GLIBCXX_HAVE_BROKEN_VSNPRINTF
      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