libstdc++-v3/config/locale/generic/c_locale.h

   1 // Wrapper for underlying C-language localization -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002, 2003, 2004 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 2, 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 //
  31 // ISO C++ 14882: 22.8  Standard locale categories.
  32 //
  33
  34 // Written by Benjamin Kosnik <bkoz@redhat.com>
  35
  36 #ifndef _C_LOCALE_H
  37 #define _C_LOCALE_H 1
  38
  39 #pragma GCC system_header
  40
  41 #include <clocale>
  42 #include <cstring>   // get std::strlen
  43 #include <cstdio>    // get std::snprintf or std::sprintf
  44
  45 #define _GLIBCXX_NUM_CATEGORIES 0
  46
  47 namespace std
  48 {
  49   typedef int*                  __c_locale;
  50
  51   // Convert numeric value of type _Tv to string and return length of
  52   // string.  If snprintf is available use it, otherwise fall back to
  53   // the unsafe sprintf which, in general, can be dangerous and should
  54   // be avoided.
  55   template<typename _Tv>
  56     int
  57     __convert_from_v(char* __out,
  58                      const int __size __attribute__((__unused__)),
  59                      const char* __fmt,
  60                      _Tv __v, const __c_locale&, int __prec)
  61     {
  62       char* __old = std::setlocale(LC_ALL, NULL);
  63       char* __sav = new char[std::strlen(__old) + 1];
  64       std::strcpy(__sav, __old);
  65       std::setlocale(LC_ALL, "C");
  66
  67 #ifdef _GLIBCXX_USE_C99
  68       const int __ret = std::snprintf(__out, __size, __fmt, __prec, __v);
  69 #else
  70       const int __ret = std::sprintf(__out, __fmt, __prec, __v);
  71 #endif
  72       std::setlocale(LC_ALL, __sav);
  73       delete [] __sav;
  74       return __ret;
  75     }
  76 }
  77
  78 #endif