libstdc++

c++locale.h
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1 // Wrapper for underlying C-language localization -*- C++ -*-
2
3 // Copyright (C) 2001-2013 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 <bkoz@redhat.com>
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 #ifdef _GLIBCXX_USE_C99
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