libstdc++
c++locale.h
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1 // Wrapper for underlying C-language localization -*- C++ -*-
2 
3 // Copyright (C) 2001-2017 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19 
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24 
25 /** @file bits/c++locale.h
26  * This is an internal header file, included by other library headers.
27  * Do not attempt to use it directly. @headername{locale}
28  */
29 
30 //
31 // ISO C++ 14882: 22.8 Standard locale categories.
32 //
33 
34 // Written by Benjamin Kosnik <[email protected]>
35 
36 #ifndef _GLIBCXX_CXX_LOCALE_H
37 #define _GLIBCXX_CXX_LOCALE_H 1
38 
39 #pragma GCC system_header
40 
41 #include <clocale>
42 
43 #define _GLIBCXX_C_LOCALE_GNU 1
44 
45 #define _GLIBCXX_NUM_CATEGORIES 6
46 
47 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
48 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
49 {
50 _GLIBCXX_BEGIN_NAMESPACE_VERSION
51 
52  extern "C" __typeof(uselocale) __uselocale;
53 
54 _GLIBCXX_END_NAMESPACE_VERSION
55 } // namespace
56 #endif
57 
58 namespace std _GLIBCXX_VISIBILITY(default)
59 {
60 _GLIBCXX_BEGIN_NAMESPACE_VERSION
61 
62  typedef __locale_t __c_locale;
63 
64  // Convert numeric value of type double and long double to string and
65  // return length of string. If vsnprintf is available use it, otherwise
66  // fall back to the unsafe vsprintf which, in general, can be dangerous
67  // and should be avoided.
68  inline int
69  __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
70  char* __out,
71  const int __size __attribute__ ((__unused__)),
72  const char* __fmt, ...)
73  {
74 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
75  __c_locale __old = __gnu_cxx::__uselocale(__cloc);
76 #else
77  char* __old = std::setlocale(LC_NUMERIC, 0);
78  char* __sav = 0;
79  if (__builtin_strcmp(__old, "C"))
80  {
81  const size_t __len = __builtin_strlen(__old) + 1;
82  __sav = new char[__len];
83  __builtin_memcpy(__sav, __old, __len);
84  std::setlocale(LC_NUMERIC, "C");
85  }
86 #endif
87 
88  __builtin_va_list __args;
89  __builtin_va_start(__args, __fmt);
90 
91 #if _GLIBCXX_USE_C99_STDIO
92  const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
93 #else
94  const int __ret = __builtin_vsprintf(__out, __fmt, __args);
95 #endif
96 
97  __builtin_va_end(__args);
98 
99 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
100  __gnu_cxx::__uselocale(__old);
101 #else
102  if (__sav)
103  {
104  std::setlocale(LC_NUMERIC, __sav);
105  delete [] __sav;
106  }
107 #endif
108  return __ret;
109  }
110 
111 _GLIBCXX_END_NAMESPACE_VERSION
112 } // namespace
113 
114 #endif
ISO C++ entities toplevel namespace is std.
GNU extensions for public use.