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, 2010
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 bits/c++locale.h
27  * This is an internal header file, included by other library headers.
28  * Do not attempt to use it directly. @headername{locale}
29  */
30 
31 //
32 // ISO C++ 14882: 22.8 Standard locale categories.
33 //
34 
35 // Written by Benjamin Kosnik <[email protected]>
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 
44 #define _GLIBCXX_C_LOCALE_GNU 1
45 
46 #define _GLIBCXX_NUM_CATEGORIES 6
47 
48 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
49 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
50 {
51 _GLIBCXX_BEGIN_NAMESPACE_VERSION
52 
53  extern "C" __typeof(uselocale) __uselocale;
54 
55 _GLIBCXX_END_NAMESPACE_VERSION
56 } // namespace
57 #endif
58 
59 namespace std _GLIBCXX_VISIBILITY(default)
60 {
61 _GLIBCXX_BEGIN_NAMESPACE_VERSION
62 
63  typedef __locale_t __c_locale;
64 
65  // Convert numeric value of type double and long double to string and
66  // return length of string. If vsnprintf is available use it, otherwise
67  // fall back to the unsafe vsprintf which, in general, can be dangerous
68  // and should be avoided.
69  inline int
70  __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
71  char* __out,
72  const int __size __attribute__ ((__unused__)),
73  const char* __fmt, ...)
74  {
75 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
76  __c_locale __old = __gnu_cxx::__uselocale(__cloc);
77 #else
78  char* __old = std::setlocale(LC_NUMERIC, 0);
79  char* __sav = 0;
80  if (__builtin_strcmp(__old, "C"))
81  {
82  const size_t __len = __builtin_strlen(__old) + 1;
83  __sav = new char[__len];
84  __builtin_memcpy(__sav, __old, __len);
85  std::setlocale(LC_NUMERIC, "C");
86  }
87 #endif
88 
89  __builtin_va_list __args;
90  __builtin_va_start(__args, __fmt);
91 
92 #ifdef _GLIBCXX_USE_C99
93  const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
94 #else
95  const int __ret = __builtin_vsprintf(__out, __fmt, __args);
96 #endif
97 
98  __builtin_va_end(__args);
99 
100 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
101  __gnu_cxx::__uselocale(__old);
102 #else
103  if (__sav)
104  {
105  std::setlocale(LC_NUMERIC, __sav);
106  delete [] __sav;
107  }
108 #endif
109  return __ret;
110  }
111 
112 _GLIBCXX_END_NAMESPACE_VERSION
113 } // namespace
114 
115 #endif