libstdc++: c++locale.h Source File

libstdc++

c++locale.h
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1// Wrapper for underlying C-language localization -*- C++ -*-
2
3// Copyright (C) 2001-2026 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)
48namespace __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
58namespace std _GLIBCXX_VISIBILITY(default)
59{
60_GLIBCXX_BEGIN_NAMESPACE_VERSION
61
62 typedef __locale_t __c_locale;
63
64#if defined _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT \
65 && defined __LONG_DOUBLE_IEEE128__
66namespace __gnu_cxx_ieee128 {
67#endif
68
69 // Convert numeric value of type double and long double to string and
70 // return length of string. If vsnprintf is available use it, otherwise
71 // fall back to the unsafe vsprintf which, in general, can be dangerous
72 // and should be avoided.
73 inline int
74 __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
75 char* __out,
76 const int __size __attribute__ ((__unused__)),
77 const char* __fmt, ...)
78 {
79#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
80 __c_locale __old = __gnu_cxx::__uselocale(__cloc);
81#else
82 char* __old = std::setlocale(LC_NUMERIC, 0);
83 char* __sav = 0;
84 if (__builtin_strcmp(__old, "C"))
85 {
86 const size_t __len = __builtin_strlen(__old) + 1;
87 __sav = new char[__len];
88 __builtin_memcpy(__sav, __old, __len);
89 std::setlocale(LC_NUMERIC, "C");
90 }
91#endif
92
93 __builtin_va_list __args;
94 __builtin_va_start(__args, __fmt);
95
96#if _GLIBCXX_USE_C99_STDIO
97 const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
98#else
99 const int __ret = __builtin_vsprintf(__out, __fmt, __args);
100#endif
101
102 __builtin_va_end(__args);
103
104#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
105 __gnu_cxx::__uselocale(__old);
106#else
107 if (__sav)
108 {
109 std::setlocale(LC_NUMERIC, __sav);
110 delete [] __sav;
111 }
112#endif
113 return __ret;
114 }
115
116#if defined _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT \
117 && defined __LONG_DOUBLE_IEEE128__
118} // namespace __gnu_cxx_ieee128
119#endif
120
121_GLIBCXX_END_NAMESPACE_VERSION
122} // namespace
123
124#endif
clocale
std
ISO C++ entities toplevel namespace is std.
__gnu_cxx
GNU extensions for public use.