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

   1 // Wrapper for underlying C-language localization -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002, 2003 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 <cstdlib>   // get std::malloc
  43 #include <cstring>   // get std::strlen
  44 #include <cstdio>    // get std::snprintf or std::sprintf
  45
  46 #define _GLIBCXX_NUM_CATEGORIES 0
  47
  48 namespace std
  49 {
  50   typedef int*                  __c_locale;
  51
  52   // Convert numeric value of type _Tv to string and return length of
  53   // string.  If snprintf is available use it, otherwise fall back to
  54   // the unsafe sprintf which, in general, can be dangerous and should
  55   // be avoided.
  56   template<typename _Tv>
  57     int
  58     __convert_from_v(char* __out,
  59                      const int __size __attribute__((__unused__)),
  60                      const char* __fmt,
  61                      _Tv __v, const __c_locale&, int __prec = -1)
  62     {
  63       char* __old = std::setlocale(LC_ALL, NULL);
  64       char* __sav = static_cast<char*>(std::malloc(std::strlen(__old) + 1));
  65       if (__sav)
  66         std::strcpy(__sav, __old);
  67       std::setlocale(LC_ALL, "C");
  68
  69       int __ret;
  70 #ifdef _GLIBCXX_USE_C99
  71       if (__prec >= 0)
  72         __ret = std::snprintf(__out, __size, __fmt, __prec, __v);
  73       else
  74         __ret = std::snprintf(__out, __size, __fmt, __v);
  75 #else
  76       if (__prec >= 0)
  77         __ret = std::sprintf(__out, __fmt, __prec, __v);
  78       else
  79         __ret = std::sprintf(__out, __fmt, __v);
  80 #endif
  81       std::setlocale(LC_ALL, __sav);
  82       std::free(__sav);
  83       return __ret;
  84     }
  85 }
  86
  87 #endif