libstdc++
c++locale.h
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1 // Wrapper for underlying C-language localization -*- C++ -*-
2 
3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009
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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the Free Software Foundation.
20 
21 // You should have received a copy of the GNU General Public License and
22 // a copy of the GCC Runtime Library Exception along with this program;
23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 // <http://www.gnu.org/licenses/>.
25 
26 /** @file c++locale.h
27  * This is an internal header file, included by other library headers.
28  * You should not attempt to use it directly.
29  */
30 
31 //
32 // ISO C++ 14882: 22.8 Standard locale categories.
33 //
34 
35 // Written by Benjamin Kosnik <bkoz@redhat.com>
36 
37 #ifndef _GLIBCXX_CXX_LOCALE_H
38 #define _GLIBCXX_CXX_LOCALE_H 1
39 
40 #pragma GCC system_header
41 
42 #include <clocale>
43 #include <cstddef>
44 
45 #define _GLIBCXX_C_LOCALE_GNU 1
46 
47 #define _GLIBCXX_NUM_CATEGORIES 6
48 
49 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
50 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
51 
52  extern "C" __typeof(uselocale) __uselocale;
53 
54 _GLIBCXX_END_NAMESPACE
55 #endif
56 
57 _GLIBCXX_BEGIN_NAMESPACE(std)
58 
59  typedef __locale_t __c_locale;
60 
61  // Convert numeric value of type double and long double to string and
62  // return length of string. If vsnprintf is available use it, otherwise
63  // fall back to the unsafe vsprintf which, in general, can be dangerous
64  // and should be avoided.
65  inline int
66  __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
67  char* __out,
68  const int __size __attribute__ ((__unused__)),
69  const char* __fmt, ...)
70  {
71 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
72  __c_locale __old = __gnu_cxx::__uselocale(__cloc);
73 #else
74  char* __old = std::setlocale(LC_NUMERIC, NULL);
75  char* __sav = NULL;
76  if (__builtin_strcmp(__old, "C"))
77  {
78  const size_t __len = __builtin_strlen(__old) + 1;
79  __sav = new char[__len];
80  __builtin_memcpy(__sav, __old, __len);
81  std::setlocale(LC_NUMERIC, "C");
82  }
83 #endif
84 
85  __builtin_va_list __args;
86  __builtin_va_start(__args, __fmt);
87 
88 #ifdef _GLIBCXX_USE_C99
89  const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
90 #else
91  const int __ret = __builtin_vsprintf(__out, __fmt, __args);
92 #endif
93 
94  __builtin_va_end(__args);
95 
96 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
97  __gnu_cxx::__uselocale(__old);
98 #else
99  if (__sav)
100  {
101  std::setlocale(LC_NUMERIC, __sav);
102  delete [] __sav;
103  }
104 #endif
105  return __ret;
106  }
107 
108 _GLIBCXX_END_NAMESPACE
109 
110 #endif