2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 The FreeBSD Foundation
6 * This software was developed by David Chisnall under sponsorship from
7 * the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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33 #ifndef _XLOCALE_PRIVATE__H_
34 #define _XLOCALE_PRIVATE__H_
40 #include <sys/types.h>
41 #include <machine/atomic.h>
42 #include "setlocale.h"
45 * The XLC_ values are indexes into the components array. They are defined in
46 * the same order as the LC_ values in locale.h, but without the LC_ALL zero
47 * value. Translating from LC_X to XLC_X is done by subtracting one.
49 * Any reordering of this enum should ensure that these invariants are not
62 _Static_assert(XLC_LAST - XLC_COLLATE == 6, "XLC values should be contiguous");
63 _Static_assert(XLC_COLLATE == LC_COLLATE - 1,
64 "XLC_COLLATE doesn't match the LC_COLLATE value.");
65 _Static_assert(XLC_CTYPE == LC_CTYPE - 1,
66 "XLC_CTYPE doesn't match the LC_CTYPE value.");
67 _Static_assert(XLC_MONETARY == LC_MONETARY - 1,
68 "XLC_MONETARY doesn't match the LC_MONETARY value.");
69 _Static_assert(XLC_NUMERIC == LC_NUMERIC - 1,
70 "XLC_NUMERIC doesn't match the LC_NUMERIC value.");
71 _Static_assert(XLC_TIME == LC_TIME - 1,
72 "XLC_TIME doesn't match the LC_TIME value.");
73 _Static_assert(XLC_MESSAGES == LC_MESSAGES - 1,
74 "XLC_MESSAGES doesn't match the LC_MESSAGES value.");
77 * Header used for objects that are reference counted. Objects may optionally
78 * have a destructor associated, which is responsible for destroying the
79 * structure. Global / static versions of the structure should have no
80 * destructor set - they can then have their reference counts manipulated as
81 * normal, but will not do anything with them.
83 * The header stores a retain count - objects are assumed to have a reference
84 * count of 1 when they are created, but the retain count is 0. When the
85 * retain count is less than 0, they are freed.
87 struct xlocale_refcounted {
88 /** Number of references to this component. */
90 /** Function used to destroy this component, if one is required*/
91 void(*destructor)(void*);
94 #define XLOCALE_DEF_VERSION_LEN 12
97 * Header for a locale component. All locale components must begin with this
100 struct xlocale_component {
101 struct xlocale_refcounted header;
102 /** Name of the locale used for this component. */
103 char locale[ENCODING_LEN+1];
104 /** Version of the definition for this component. */
105 char version[XLOCALE_DEF_VERSION_LEN];
109 * xlocale structure, stores per-thread locale information.
112 struct xlocale_refcounted header;
113 /** Components for the locale. */
114 struct xlocale_component *components[XLC_LAST];
115 /** Flag indicating if components[XLC_MONETARY] has changed since the
116 * last call to localeconv_l() with this locale. */
117 int monetary_locale_changed;
118 /** Flag indicating whether this locale is actually using a locale for
119 * LC_MONETARY (1), or if it should use the C default instead (0). */
120 int using_monetary_locale;
121 /** Flag indicating if components[XLC_NUMERIC] has changed since the
122 * last call to localeconv_l() with this locale. */
123 int numeric_locale_changed;
124 /** Flag indicating whether this locale is actually using a locale for
125 * LC_NUMERIC (1), or if it should use the C default instead (0). */
126 int using_numeric_locale;
127 /** Flag indicating whether this locale is actually using a locale for
128 * LC_TIME (1), or if it should use the C default instead (0). */
129 int using_time_locale;
130 /** Flag indicating whether this locale is actually using a locale for
131 * LC_MESSAGES (1), or if it should use the C default instead (0). */
132 int using_messages_locale;
133 /** The structure to be returned from localeconv_l() for this locale. */
135 /** Buffer used by nl_langinfo_l() */
140 * Increments the reference count of a reference-counted structure.
142 __attribute__((unused)) static void*
143 xlocale_retain(void *val)
145 struct xlocale_refcounted *obj = val;
146 atomic_add_long(&(obj->retain_count), 1);
150 * Decrements the reference count of a reference-counted structure, freeing it
151 * if this is the last reference, calling its destructor if it has one.
153 __attribute__((unused)) static void
154 xlocale_release(void *val)
156 struct xlocale_refcounted *obj = val;
159 count = atomic_fetchadd_long(&(obj->retain_count), -1) - 1;
160 if (count < 0 && obj->destructor != NULL)
161 obj->destructor(obj);
165 * Load functions. Each takes the name of a locale and a pointer to the data
166 * to be initialised as arguments. Two special values are allowed for the
168 extern void* __collate_load(const char*, locale_t);
169 extern void* __ctype_load(const char*, locale_t);
170 extern void* __messages_load(const char*, locale_t);
171 extern void* __monetary_load(const char*, locale_t);
172 extern void* __numeric_load(const char*, locale_t);
173 extern void* __time_load(const char*, locale_t);
175 extern struct _xlocale __xlocale_global_locale;
176 extern struct _xlocale __xlocale_C_locale;
179 * Caches the rune table in TLS for fast access.
181 void __set_thread_rune_locale(locale_t loc);
183 * Flag indicating whether a per-thread locale has been set. If no per-thread
184 * locale has ever been set, then we always use the global locale.
186 extern int __has_thread_locale;
189 * The per-thread locale. Avoids the need to use pthread lookup functions when
190 * getting the per-thread locale.
192 extern _Thread_local locale_t __thread_locale;
195 * Returns the current locale for this thread, or the global locale if none is
196 * set. The caller does not have to free the locale. The return value from
197 * this call is not guaranteed to remain valid after the locale changes. As
198 * such, this should only be called within libc functions.
200 static inline locale_t __get_locale(void)
203 if (!__has_thread_locale) {
204 return (&__xlocale_global_locale);
206 return (__thread_locale ? __thread_locale : &__xlocale_global_locale);
210 * Two magic values are allowed for locale_t objects. NULL and -1. This
211 * function maps those to the real locales that they represent.
213 static inline locale_t get_real_locale(locale_t locale)
215 switch ((intptr_t)locale) {
216 case 0: return (&__xlocale_C_locale);
217 case -1: return (&__xlocale_global_locale);
218 default: return (locale);
223 * Replace a placeholder locale with the real global or thread-local locale_t.
225 #define FIX_LOCALE(l) (l = get_real_locale(l))