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_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  #if defined _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT \
      65    && defined __LONG_DOUBLE_IEEE128__
      66  namespace __gnu_cxx_ieee128 {
      67  #endif
      68  
      69    // Convert numeric value of type double and long double to string and
      70    // return length of string.  If vsnprintf is available use it, otherwise
      71    // fall back to the unsafe vsprintf which, in general, can be dangerous
      72    // and should be avoided.
      73    inline int
      74    __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
      75  		   char* __out,
      76  		   const int __size __attribute__ ((__unused__)),
      77  		   const char* __fmt, ...)
      78    {
      79  #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
      80      __c_locale __old = __gnu_cxx::__uselocale(__cloc);
      81  #else
      82      char* __old = std::setlocale(LC_NUMERIC, 0);
      83      char* __sav = 0;
      84      if (__builtin_strcmp(__old, "C"))
      85        {
      86  	const size_t __len = __builtin_strlen(__old) + 1;
      87  	__sav = new char[__len];
      88  	__builtin_memcpy(__sav, __old, __len);
      89  	std::setlocale(LC_NUMERIC, "C");
      90        }
      91  #endif
      92  
      93      __builtin_va_list __args;
      94      __builtin_va_start(__args, __fmt);
      95  
      96  #if _GLIBCXX_USE_C99_STDIO
      97      const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
      98  #else
      99      const int __ret = __builtin_vsprintf(__out, __fmt, __args);
     100  #endif
     101  
     102      __builtin_va_end(__args);
     103  
     104  #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
     105      __gnu_cxx::__uselocale(__old);
     106  #else
     107      if (__sav)
     108        {
     109  	std::setlocale(LC_NUMERIC, __sav);
     110  	delete [] __sav;
     111        }
     112  #endif
     113      return __ret;
     114    }
     115  
     116  #if defined _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT \
     117    && defined __LONG_DOUBLE_IEEE128__
     118  } // namespace __gnu_cxx_ieee128
     119  #endif
     120  
     121  _GLIBCXX_END_NAMESPACE_VERSION
     122  } // namespace
     123  
     124  #endif