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Edit File: c++locale.h

// Wrapper for underlying C-language localization -*- C++ -*-

// Copyright (C) 2001-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file bits/c++locale.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{locale}
 */

//
// ISO C++ 14882: 22.8  Standard locale categories.
//

// Written by Benjamin Kosnik <bkoz@redhat.com>

#ifndef _GLIBCXX_CXX_LOCALE_H
#define _GLIBCXX_CXX_LOCALE_H 1

#pragma GCC system_header

#include <clocale>

#define _GLIBCXX_C_LOCALE_GNU 1

#define _GLIBCXX_NUM_CATEGORIES 6

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

extern "C" __typeof(uselocale) __uselocale;

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

typedef __locale_t		__c_locale;

// Convert numeric value of type double and long double to string and
  // return length of string.  If vsnprintf is available use it, otherwise
  // fall back to the unsafe vsprintf which, in general, can be dangerous
  // and should be avoided.
  inline int
  __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
		   char* __out,
		   const int __size __attribute__ ((__unused__)),
		   const char* __fmt, ...)
  {
#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
    __c_locale __old = __gnu_cxx::__uselocale(__cloc);
#else
    char* __old = std::setlocale(LC_NUMERIC, 0);
    char* __sav = 0;
    if (__builtin_strcmp(__old, "C"))
      {
	const size_t __len = __builtin_strlen(__old) + 1;
	__sav = new char[__len];
	__builtin_memcpy(__sav, __old, __len);
	std::setlocale(LC_NUMERIC, "C");
      }
#endif

__builtin_va_list __args;
    __builtin_va_start(__args, __fmt);

#if _GLIBCXX_USE_C99_STDIO
    const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
#else
    const int __ret = __builtin_vsprintf(__out, __fmt, __args);
#endif

__builtin_va_end(__args);

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
    __gnu_cxx::__uselocale(__old);
#else
    if (__sav)
      {
	std::setlocale(LC_NUMERIC, __sav);
	delete [] __sav;
      }
#endif
    return __ret;
  }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif