1/* Define current locale data for LC_CTYPE category.
2 Copyright (C) 1995-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include "localeinfo.h"
20#include <ctype.h>
21#include <endian.h>
22#include <stdint.h>
23
24_NL_CURRENT_DEFINE (LC_CTYPE);
25
26/* We are called after loading LC_CTYPE data to load it into
27 the variables used by the ctype.h macros. */
28
29
30
31void
32_nl_postload_ctype (void)
33{
34#define current(type,x,offset) \
35 ((const type *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_##x) + offset)
36
37 const union locale_data_value *const ctypes
38 = _nl_global_locale.__locales[LC_CTYPE]->values;
39
40/* These thread-local variables are defined in ctype-info.c.
41 The declarations here must match those in localeinfo.h.
42
43 These point into arrays of 384, so they can be indexed by any `unsigned
44 char' value [0,255]; by EOF (-1); or by any `signed char' value
45 [-128,-1). ISO C requires that the ctype functions work for `unsigned
46 char' values and for EOF; we also support negative `signed char' values
47 for broken old programs. The case conversion arrays are of `int's
48 rather than `unsigned char's because tolower (EOF) must be EOF, which
49 doesn't fit into an `unsigned char'. But today more important is that
50 the arrays are also used for multi-byte character sets.
51
52 First we update the special members of _nl_global_locale as newlocale
53 would. This is necessary for uselocale (LC_GLOBAL_LOCALE) to find these
54 values properly. */
55
56 _nl_global_locale.__ctype_b = (const unsigned short int *)
57 ctypes[_NL_ITEM_INDEX (_NL_CTYPE_CLASS)].string + 128;
58 _nl_global_locale.__ctype_tolower = (const int *)
59 ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOLOWER)].string + 128;
60 _nl_global_locale.__ctype_toupper = (const int *)
61 ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOUPPER)].string + 128;
62
63 /* Next we must set the thread-local caches if and only if this thread is
64 in fact using the global locale. */
65 if (_NL_CURRENT_LOCALE == &_nl_global_locale)
66 {
67 __libc_tsd_set (const uint16_t *, CTYPE_B,
68 (void *) _nl_global_locale.__ctype_b);
69 __libc_tsd_set (const int32_t *, CTYPE_TOUPPER,
70 (void *) _nl_global_locale.__ctype_toupper);
71 __libc_tsd_set (const int32_t *, CTYPE_TOLOWER,
72 (void *) _nl_global_locale.__ctype_tolower);
73 }
74
75#include <shlib-compat.h>
76#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3)
77 /* We must use the exported names to access these so we are sure to
78 be accessing the main executable's copy if it has COPY relocs. */
79
80 extern const unsigned short int *__ctype_b; /* Characteristics. */
81 extern const __int32_t *__ctype_tolower; /* Case conversions. */
82 extern const __int32_t *__ctype_toupper; /* Case conversions. */
83
84 extern const uint32_t *__ctype32_b;
85 extern const uint32_t *__ctype32_toupper;
86 extern const uint32_t *__ctype32_tolower;
87
88 /* We need the .symver declarations these macros generate so that
89 our references are explicitly bound to the versioned symbol names
90 rather than the unadorned names that are not exported. When the
91 linker sees these bound to local symbols (as the unexported names are)
92 then it doesn't generate a proper relocation to the global symbols.
93 We need those relocations so that a versioned definition with a COPY
94 reloc in an executable will override the libc.so definition. */
95
96compat_symbol_reference (libc, __ctype_b, __ctype_b, GLIBC_2_0);
97compat_symbol_reference (libc, __ctype_tolower, __ctype_tolower, GLIBC_2_0);
98compat_symbol_reference (libc, __ctype_toupper, __ctype_toupper, GLIBC_2_0);
99compat_symbol_reference (libc, __ctype32_b, __ctype32_b, GLIBC_2_0);
100compat_symbol_reference (libc, __ctype32_tolower, __ctype32_tolower,
101 GLIBC_2_2);
102compat_symbol_reference (libc, __ctype32_toupper, __ctype32_toupper,
103 GLIBC_2_2);
104
105 __ctype_b = current (uint16_t, CLASS, 128);
106 __ctype_toupper = current (int32_t, TOUPPER, 128);
107 __ctype_tolower = current (int32_t, TOLOWER, 128);
108 __ctype32_b = current (uint32_t, CLASS32, 0);
109 __ctype32_toupper = current (uint32_t, TOUPPER32, 0);
110 __ctype32_tolower = current (uint32_t, TOLOWER32, 0);
111#endif
112}
113