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/** @file c++locale.h
32 *  This is an internal header file, included by other library headers.
33 *  You should not attempt to use it directly.
34 */
35
36//
37// ISO C++ 14882: 22.8  Standard locale categories.
38//
39
40// Written by Benjamin Kosnik <bkoz@redhat.com>
41
42#ifndef _C_LOCALE_H
43#define _C_LOCALE_H 1
44
45#pragma GCC system_header
46
47#include <clocale>
48#include <cstring>   // get std::strlen
49#include <cstdio>    // get std::vsnprintf or std::vsprintf
50#include <cstdarg>
51
52#define _GLIBCXX_NUM_CATEGORIES 0
53
54_GLIBCXX_BEGIN_NAMESPACE(std)
55
56  typedef int*			__c_locale;
57
58  // Convert numeric value of type double and long double to string and
59  // return length of string.  If vsnprintf is available use it, otherwise
60  // fall back to the unsafe vsprintf which, in general, can be dangerous
61  // and should be avoided.
62  inline int
63  __convert_from_v(const __c_locale&, char* __out,
64		   const int __size __attribute__((__unused__)),
65		   const char* __fmt, ...)
66  {
67    char* __old = std::setlocale(LC_NUMERIC, NULL);
68    char* __sav = NULL;
69    if (std::strcmp(__old, "C"))
70      {
71	__sav = new char[std::strlen(__old) + 1];
72	std::strcpy(__sav, __old);
73	std::setlocale(LC_NUMERIC, "C");
74      }
75
76    va_list __args;
77    va_start(__args, __fmt);
78
79#ifdef _GLIBCXX_USE_C99
80    const int __ret = std::vsnprintf(__out, __size, __fmt, __args);
81#else
82    const int __ret = std::vsprintf(__out, __fmt, __args);
83#endif
84
85    va_end(__args);
86
87    if (__sav)
88      {
89	std::setlocale(LC_NUMERIC, __sav);
90	delete [] __sav;
91      }
92    return __ret;
93  }
94
95_GLIBCXX_END_NAMESPACE
96
97#endif
98