1 /* Helper functions used by strftime/strptime to handle locale-specific "eras".
2 Copyright (C) 1995-2016 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #include "../locale/localeinfo.h"
20 #include <libc-lock.h>
26 /* Some of the functions here must not be used while setlocale is called. */
27 __libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden)
29 #define CURRENT(item) (current->values[_NL_ITEM_INDEX (item)].string)
30 #define CURRENT_WORD(item) (current->values[_NL_ITEM_INDEX (item)].word)
32 #define ERA_DATE_CMP(a, b) \
33 (a[0] < b[0] || (a[0] == b[0] && (a[1] < b[1] \
34 || (a[1] == b[1] && a[2] <= b[2]))))
36 /* Look up the era information in CURRENT's locale strings and
37 cache it in CURRENT->private. */
38 static void internal_function
39 _nl_init_era_entries (struct __locale_data *current)
42 struct lc_time_data *data;
44 /* Avoid touching CURRENT if there is no data at all, for _nl_C_LC_TIME. */
45 if (CURRENT_WORD (_NL_TIME_ERA_NUM_ENTRIES) == 0)
48 __libc_rwlock_wrlock (__libc_setlocale_lock);
50 if (current->private.time == NULL)
52 current->private.time = malloc (sizeof *current->private.time);
53 if (current->private.time == NULL)
55 memset (current->private.time, 0, sizeof *current->private.time);
56 current->private.cleanup = &_nl_cleanup_time;
58 data = current->private.time;
60 if (! data->era_initialized)
62 size_t new_num_eras = CURRENT_WORD (_NL_TIME_ERA_NUM_ENTRIES);
63 if (new_num_eras == 0)
65 if (data->eras != NULL)
73 struct era_entry *new_eras = data->eras;
75 if (data->num_eras != new_num_eras)
77 (struct era_entry *) realloc (data->eras,
79 * sizeof (struct era_entry));
88 const char *ptr = CURRENT (_NL_TIME_ERA_ENTRIES);
89 data->num_eras = new_num_eras;
90 data->eras = new_eras;
92 for (cnt = 0; cnt < new_num_eras; ++cnt)
94 const char *base_ptr = ptr;
95 memcpy ((void *) (new_eras + cnt), (const void *) ptr,
96 sizeof (uint32_t) * 8);
98 if (ERA_DATE_CMP(new_eras[cnt].start_date,
99 new_eras[cnt].stop_date))
100 if (new_eras[cnt].direction == (uint32_t) '+')
101 new_eras[cnt].absolute_direction = 1;
103 new_eras[cnt].absolute_direction = -1;
105 if (new_eras[cnt].direction == (uint32_t) '+')
106 new_eras[cnt].absolute_direction = -1;
108 new_eras[cnt].absolute_direction = 1;
110 /* Skip numeric values. */
111 ptr += sizeof (uint32_t) * 8;
113 /* Set and skip era name. */
114 new_eras[cnt].era_name = ptr;
115 ptr = strchr (ptr, '\0') + 1;
117 /* Set and skip era format. */
118 new_eras[cnt].era_format = ptr;
119 ptr = strchr (ptr, '\0') + 1;
121 ptr += 3 - (((ptr - (const char *) base_ptr) + 3) & 3);
123 /* Set and skip wide era name. */
124 new_eras[cnt].era_wname = (wchar_t *) ptr;
125 ptr = (char *) (__wcschr ((wchar_t *) ptr, L'\0') + 1);
127 /* Set and skip wide era format. */
128 new_eras[cnt].era_wformat = (wchar_t *) ptr;
129 ptr = (char *) (__wcschr ((wchar_t *) ptr, L'\0') + 1);
134 data->era_initialized = 1;
138 __libc_rwlock_unlock (__libc_setlocale_lock);
143 _nl_get_era_entry (const struct tm *tp, struct __locale_data *current)
145 if (current->private.time == NULL || !current->private.time->era_initialized)
146 _nl_init_era_entries (current);
148 if (current->private.time != NULL)
150 /* Now compare date with the available eras. */
151 const int32_t tdate[3] = { tp->tm_year, tp->tm_mon, tp->tm_mday };
153 for (cnt = 0; cnt < current->private.time->num_eras; ++cnt)
154 if ((ERA_DATE_CMP (current->private.time->eras[cnt].start_date, tdate)
155 && ERA_DATE_CMP (tdate,
156 current->private.time->eras[cnt].stop_date))
157 || (ERA_DATE_CMP (current->private.time->eras[cnt].stop_date,
159 && ERA_DATE_CMP (tdate,
160 current->private.time->eras[cnt].start_date)))
161 return ¤t->private.time->eras[cnt];
170 _nl_select_era_entry (int cnt, struct __locale_data *current)
172 if (current->private.time == NULL || !current->private.time->era_initialized)
173 _nl_init_era_entries (current);
175 return (current->private.time == NULL
176 ? NULL : ¤t->private.time->eras[cnt]);