1 // Wrapper for underlying C-language localization -*- C++ -*-
2
3 // Copyright (C) 2001-2020 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_NUM_CATEGORIES 0
44
_GLIBCXX_VISIBILITY(default)45 namespace std _GLIBCXX_VISIBILITY(default)
46 {
47 _GLIBCXX_BEGIN_NAMESPACE_VERSION
48
49 typedef int* __c_locale;
50
51 // Convert numeric value of type double and long double to string and
52 // return length of string. If vsnprintf is available use it, otherwise
53 // fall back to the unsafe vsprintf which, in general, can be dangerous
54 // and should be avoided.
55 inline int
56 __convert_from_v(const __c_locale&, char* __out,
57 const int __size __attribute__((__unused__)),
58 const char* __fmt, ...)
59 {
60 char* __old = std::setlocale(LC_NUMERIC, 0);
61 char* __sav = 0;
62 if (__builtin_strcmp(__old, "C"))
63 {
64 const size_t __len = __builtin_strlen(__old) + 1;
65 __sav = new char[__len];
66 __builtin_memcpy(__sav, __old, __len);
67 std::setlocale(LC_NUMERIC, "C");
68 }
69
70 __builtin_va_list __args;
71 __builtin_va_start(__args, __fmt);
72
73 #if _GLIBCXX_USE_C99_STDIO && !_GLIBCXX_HAVE_BROKEN_VSNPRINTF
74 const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
75 #else
76 const int __ret = __builtin_vsprintf(__out, __fmt, __args);
77 #endif
78
79 __builtin_va_end(__args);
80
81 if (__sav)
82 {
83 std::setlocale(LC_NUMERIC, __sav);
84 delete [] __sav;
85 }
86 return __ret;
87 }
88
89 _GLIBCXX_END_NAMESPACE_VERSION
90 } // namespace
91
92 #endif
93