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

   1 // Wrapper for underlying C-language localization -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20 // USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 //
  32 // ISO C++ 14882: 22.8  Standard locale categories.
  33 //
  34
  35 // Written by Benjamin Kosnik <bkoz@redhat.com>
  36
  37 #ifndef _C_LOCALE_H
  38 #define _C_LOCALE_H 1
  39
  40 #pragma GCC system_header
  41
  42 #include <clocale>
  43 #include <cstring>   // get std::strlen
  44 #include <cstdio>    // get std::vsnprintf or std::vsprintf
  45 #include <cstdarg>
  46
  47 #define _GLIBCXX_NUM_CATEGORIES 0
  48
  49 _GLIBCXX_BEGIN_NAMESPACE(std)
  50
  51   typedef int*                  __c_locale;
  52
  53   // Convert numeric value of type double and long double to string and
  54   // return length of string.  If vsnprintf is available use it, otherwise
  55   // fall back to the unsafe vsprintf which, in general, can be dangerous
  56   // and should be avoided.
  57   inline int
  58   __convert_from_v(const __c_locale&, char* __out,
  59                    const int __size __attribute__((__unused__)),
  60                    const char* __fmt, ...)
  61   {
  62     char* __old = std::setlocale(LC_NUMERIC, NULL);
  63     char* __sav = NULL;
  64     if (std::strcmp(__old, "C"))
  65       {
  66         __sav = new char[std::strlen(__old) + 1];
  67         std::strcpy(__sav, __old);
  68         std::setlocale(LC_NUMERIC, "C");
  69       }
  70
  71     va_list __args;
  72     va_start(__args, __fmt);
  73
  74 #ifdef _GLIBCXX_USE_C99
  75     const int __ret = std::vsnprintf(__out, __size, __fmt, __args);
  76 #else
  77     const int __ret = std::vsprintf(__out, __fmt, __args);
  78 #endif
  79
  80     va_end(__args);
  81
  82     if (__sav)
  83       {
  84         std::setlocale(LC_NUMERIC, __sav);
  85         delete [] __sav;
  86       }
  87     return __ret;
  88   }
  89
  90 _GLIBCXX_END_NAMESPACE
  91
  92 #endif