1/* Helper functions used by strftime/strptime to handle alternate digits.
2 Copyright (C) 1995-2022 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 "../locale/localeinfo.h"
20#include <libc-lock.h>
21#include <stdlib.h>
22#include <wchar.h>
23#include <string.h>
24#include <stdint.h>
25
26/* Some of the functions here must not be used while setlocale is called. */
27__libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden)
28
29#define CURRENT(item) (current->values[_NL_ITEM_INDEX (item)].string)
30#define CURRENT_WSTR(item) \
31 ((wchar_t *) current->values[_NL_ITEM_INDEX (item)].wstr)
32
33static void
34_nl_init_alt_digit (struct __locale_data *current)
35{
36 struct lc_time_data *data;
37
38 if (current->private.time == NULL)
39 {
40 current->private.time = malloc (sizeof *current->private.time);
41 if (current->private.time == NULL)
42 return;
43 memset (current->private.time, 0, sizeof *current->private.time);
44 current->private.cleanup = &_nl_cleanup_time;
45 }
46 data = current->private.time;
47
48 if (! data->alt_digits_initialized)
49 {
50 const char *ptr = CURRENT (ALT_DIGITS);
51 size_t cnt;
52
53 data->alt_digits_initialized = 1;
54
55 if (ptr != NULL)
56 {
57 data->alt_digits = malloc (100 * sizeof (const char *));
58 if (data->alt_digits != NULL)
59 for (cnt = 0; cnt < 100; ++cnt)
60 {
61 data->alt_digits[cnt] = ptr;
62
63 /* Skip digit format. */
64 ptr = strchr (ptr, '\0') + 1;
65 }
66 }
67 }
68
69}
70
71const char *
72_nl_get_alt_digit (unsigned int number, struct __locale_data *current)
73{
74 const char *result;
75
76 if (number >= 100 || CURRENT (ALT_DIGITS)[0] == '\0')
77 return NULL;
78
79 __libc_rwlock_wrlock (__libc_setlocale_lock);
80
81 if (current->private.time == NULL
82 || ! current->private.time->alt_digits_initialized)
83 _nl_init_alt_digit (current);
84
85 result = ((current->private.time != NULL
86 && current->private.time->alt_digits != NULL)
87 ? current->private.time->alt_digits[number]
88 : NULL);
89
90 __libc_rwlock_unlock (__libc_setlocale_lock);
91
92 return result;
93}
94
95
96const wchar_t *
97_nl_get_walt_digit (unsigned int number, struct __locale_data *current)
98{
99 const wchar_t *result = NULL;
100 struct lc_time_data *data;
101
102 if (number >= 100 || CURRENT_WSTR (_NL_WALT_DIGITS)[0] == L'\0')
103 return NULL;
104
105 __libc_rwlock_wrlock (__libc_setlocale_lock);
106
107 if (current->private.time == NULL)
108 {
109 current->private.time = malloc (sizeof *current->private.time);
110 if (current->private.time == NULL)
111 goto out;
112 memset (current->private.time, 0, sizeof *current->private.time);
113 current->private.cleanup = &_nl_cleanup_time;
114 }
115 data = current->private.time;
116
117 if (! data->walt_digits_initialized)
118 {
119 const wchar_t *ptr = CURRENT_WSTR (_NL_WALT_DIGITS);
120 size_t cnt;
121
122 data->walt_digits_initialized = 1;
123
124 if (ptr != NULL)
125 {
126 data->walt_digits = malloc (100 * sizeof (const uint32_t *));
127 if (data->walt_digits != NULL)
128 for (cnt = 0; cnt < 100; ++cnt)
129 {
130 data->walt_digits[cnt] = ptr;
131
132 /* Skip digit format. */
133 ptr = __wcschr (ptr, L'\0') + 1;
134 }
135 }
136 }
137
138 if (data->walt_digits != NULL)
139 result = data->walt_digits[number];
140
141 out:
142 __libc_rwlock_unlock (__libc_setlocale_lock);
143
144 return (wchar_t *) result;
145}
146
147
148int
149_nl_parse_alt_digit (const char **strp, struct __locale_data *current)
150{
151 const char *str = *strp;
152 int result = -1;
153 size_t cnt;
154 size_t maxlen = 0;
155
156 if (CURRENT_WSTR (_NL_WALT_DIGITS)[0] == L'\0')
157 return result;
158
159 __libc_rwlock_wrlock (__libc_setlocale_lock);
160
161 if (current->private.time == NULL
162 || ! current->private.time->alt_digits_initialized)
163 _nl_init_alt_digit (current);
164
165 if (current->private.time != NULL
166 && current->private.time->alt_digits != NULL)
167 /* Matching is not unambiguous. The alternative digits could be like
168 I, II, III, ... and the first one is a substring of the second
169 and third. Therefore we must keep on searching until we found
170 the longest possible match. Note that this is not specified in
171 the standard. */
172 for (cnt = 0; cnt < 100; ++cnt)
173 {
174 const char *const dig = current->private.time->alt_digits[cnt];
175 size_t len = strlen (dig);
176
177 if (len > maxlen && strncmp (dig, str, len) == 0)
178 {
179 maxlen = len;
180 result = (int) cnt;
181 }
182 }
183
184 __libc_rwlock_unlock (__libc_setlocale_lock);
185
186 if (result != -1)
187 *strp += maxlen;
188
189 return result;
190}
191