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

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

// Copyright (C) 2001, 2002, 2003 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 2, 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

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

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

#ifndef _CPP_BITS_C_LOCALE_H
#define _CPP_BITS_C_LOCALE_H 1

#pragma GCC system_header

#include <clocale>
#include <langinfo.h>		// For codecvt
#include <iconv.h>		// For codecvt using iconv, iconv_t
#include <libintl.h> 		// For messages

#define _GLIBCPP_C_LOCALE_GNU 1

#define _GLIBCPP_NUM_CATEGORIES 6

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
namespace __gnu_cxx
{
  extern "C" __typeof(uselocale) __uselocale;
}
#endif

namespace std
{
  typedef __locale_t		__c_locale;

  // Convert numeric value of type _Tv to string and return length of
  // string.  If snprintf is available use it, otherwise fall back to
  // the unsafe sprintf which, in general, can be dangerous and should
  // be avoided.
  template<typename _Tv>
    int
    __convert_from_v(char* __out, const int __size, const char* __fmt,
#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
		     _Tv __v, const __c_locale& __cloc, int __prec = -1)
    {
      __c_locale __old = __gnu_cxx::__uselocale(__cloc);
#else
		     _Tv __v, const __c_locale&, int __prec = -1)
    {
      char* __old = setlocale(LC_ALL, NULL);
      char* __sav = static_cast<char*>(malloc(strlen(__old) + 1));
      if (__sav)
        strcpy(__sav, __old);
      setlocale(LC_ALL, "C");
#endif

      int __ret;
#ifdef _GLIBCPP_USE_C99
      if (__prec >= 0)
        __ret = snprintf(__out, __size, __fmt, __prec, __v);
      else
        __ret = snprintf(__out, __size, __fmt, __v);
#else
      if (__prec >= 0)
        __ret = sprintf(__out, __fmt, __prec, __v);
      else
        __ret = sprintf(__out, __fmt, __v);
#endif

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
      __gnu_cxx::__uselocale(__old);
#else
      setlocale(LC_ALL, __sav);
      free(__sav);
#endif
      return __ret;
    }
}

#endif