1 | /* Helper functions used by strftime/strptime to handle alternate digits. |
2 | Copyright (C) 1995-2017 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 | <http://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 | |
33 | static 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 | |
71 | const char * |
72 | internal_function |
73 | _nl_get_alt_digit (unsigned int number, struct __locale_data *current) |
74 | { |
75 | const char *result; |
76 | |
77 | if (number >= 100 || CURRENT (ALT_DIGITS)[0] == '\0') |
78 | return NULL; |
79 | |
80 | __libc_rwlock_wrlock (__libc_setlocale_lock); |
81 | |
82 | if (current->private.time == NULL |
83 | || ! current->private.time->alt_digits_initialized) |
84 | _nl_init_alt_digit (current); |
85 | |
86 | result = ((current->private.time != NULL |
87 | && current->private.time->alt_digits != NULL) |
88 | ? current->private.time->alt_digits[number] |
89 | : NULL); |
90 | |
91 | __libc_rwlock_unlock (__libc_setlocale_lock); |
92 | |
93 | return result; |
94 | } |
95 | |
96 | |
97 | const wchar_t * |
98 | internal_function |
99 | _nl_get_walt_digit (unsigned int number, struct __locale_data *current) |
100 | { |
101 | const wchar_t *result = NULL; |
102 | struct lc_time_data *data; |
103 | |
104 | if (number >= 100 || CURRENT_WSTR (_NL_WALT_DIGITS)[0] == L'\0') |
105 | return NULL; |
106 | |
107 | __libc_rwlock_wrlock (__libc_setlocale_lock); |
108 | |
109 | if (current->private.time == NULL) |
110 | { |
111 | current->private.time = malloc (sizeof *current->private.time); |
112 | if (current->private.time == NULL) |
113 | goto out; |
114 | memset (current->private.time, 0, sizeof *current->private.time); |
115 | current->private.cleanup = &_nl_cleanup_time; |
116 | } |
117 | data = current->private.time; |
118 | |
119 | if (! data->walt_digits_initialized) |
120 | { |
121 | const wchar_t *ptr = CURRENT_WSTR (_NL_WALT_DIGITS); |
122 | size_t cnt; |
123 | |
124 | data->walt_digits_initialized = 1; |
125 | |
126 | if (ptr != NULL) |
127 | { |
128 | data->walt_digits = malloc (100 * sizeof (const uint32_t *)); |
129 | if (data->walt_digits != NULL) |
130 | for (cnt = 0; cnt < 100; ++cnt) |
131 | { |
132 | data->walt_digits[cnt] = ptr; |
133 | |
134 | /* Skip digit format. */ |
135 | ptr = __wcschr (ptr, L'\0') + 1; |
136 | } |
137 | } |
138 | } |
139 | |
140 | if (data->walt_digits != NULL) |
141 | result = data->walt_digits[number]; |
142 | |
143 | out: |
144 | __libc_rwlock_unlock (__libc_setlocale_lock); |
145 | |
146 | return (wchar_t *) result; |
147 | } |
148 | |
149 | |
150 | int |
151 | internal_function |
152 | _nl_parse_alt_digit (const char **strp, struct __locale_data *current) |
153 | { |
154 | const char *str = *strp; |
155 | int result = -1; |
156 | size_t cnt; |
157 | size_t maxlen = 0; |
158 | |
159 | if (CURRENT_WSTR (_NL_WALT_DIGITS)[0] == L'\0') |
160 | return result; |
161 | |
162 | __libc_rwlock_wrlock (__libc_setlocale_lock); |
163 | |
164 | if (current->private.time == NULL |
165 | || ! current->private.time->alt_digits_initialized) |
166 | _nl_init_alt_digit (current); |
167 | |
168 | if (current->private.time != NULL && |
169 | current->private.time->alt_digits != NULL) |
170 | /* Matching is not unambiguous. The alternative digits could be like |
171 | I, II, III, ... and the first one is a substring of the second |
172 | and third. Therefore we must keep on searching until we found |
173 | the longest possible match. Note that this is not specified in |
174 | the standard. */ |
175 | for (cnt = 0; cnt < 100; ++cnt) |
176 | { |
177 | const char *const dig = current->private.time->alt_digits[cnt]; |
178 | size_t len = strlen (dig); |
179 | |
180 | if (len > maxlen && strncmp (dig, str, len) == 0) |
181 | { |
182 | maxlen = len; |
183 | result = (int) cnt; |
184 | } |
185 | } |
186 | |
187 | __libc_rwlock_unlock (__libc_setlocale_lock); |
188 | |
189 | if (result != -1) |
190 | *strp += maxlen; |
191 | |
192 | return result; |
193 | } |
194 | |