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glibc/time/era.c
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/* Helper functions used by strftime/strptime to handle locale-specific "eras". | |
Copyright (C) 1995-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include "../locale/localeinfo.h" | |
#include <libc-lock.h> | |
#include <stdlib.h> | |
#include <wchar.h> | |
#include <string.h> | |
#include <stdint.h> | |
/* Some of the functions here must not be used while setlocale is called. */ | |
__libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden) | |
#define CURRENT(item) (current->values[_NL_ITEM_INDEX (item)].string) | |
#define CURRENT_WORD(item) (current->values[_NL_ITEM_INDEX (item)].word) | |
#define ERA_DATE_CMP(a, b) \ | |
(a[0] < b[0] || (a[0] == b[0] && (a[1] < b[1] \ | |
|| (a[1] == b[1] && a[2] <= b[2])))) | |
/* Look up the era information in CURRENT's locale strings and | |
cache it in CURRENT->private. */ | |
static void internal_function | |
_nl_init_era_entries (struct __locale_data *current) | |
{ | |
size_t cnt; | |
struct lc_time_data *data; | |
/* Avoid touching CURRENT if there is no data at all, for _nl_C_LC_TIME. */ | |
if (CURRENT_WORD (_NL_TIME_ERA_NUM_ENTRIES) == 0) | |
return; | |
__libc_rwlock_wrlock (__libc_setlocale_lock); | |
if (current->private.time == NULL) | |
{ | |
current->private.time = malloc (sizeof *current->private.time); | |
if (current->private.time == NULL) | |
goto out; | |
memset (current->private.time, 0, sizeof *current->private.time); | |
current->private.cleanup = &_nl_cleanup_time; | |
} | |
data = current->private.time; | |
if (! data->era_initialized) | |
{ | |
size_t new_num_eras = CURRENT_WORD (_NL_TIME_ERA_NUM_ENTRIES); | |
if (new_num_eras == 0) | |
{ | |
if (data->eras != NULL) | |
{ | |
free (data->eras); | |
data->eras = NULL; | |
} | |
} | |
else | |
{ | |
struct era_entry *new_eras = data->eras; | |
if (data->num_eras != new_num_eras) | |
new_eras = | |
(struct era_entry *) realloc (data->eras, | |
new_num_eras | |
* sizeof (struct era_entry)); | |
if (new_eras == NULL) | |
{ | |
free (data->eras); | |
data->num_eras = 0; | |
data->eras = NULL; | |
} | |
else | |
{ | |
const char *ptr = CURRENT (_NL_TIME_ERA_ENTRIES); | |
data->num_eras = new_num_eras; | |
data->eras = new_eras; | |
for (cnt = 0; cnt < new_num_eras; ++cnt) | |
{ | |
const char *base_ptr = ptr; | |
memcpy ((void *) (new_eras + cnt), (const void *) ptr, | |
sizeof (uint32_t) * 8); | |
if (ERA_DATE_CMP(new_eras[cnt].start_date, | |
new_eras[cnt].stop_date)) | |
if (new_eras[cnt].direction == (uint32_t) '+') | |
new_eras[cnt].absolute_direction = 1; | |
else | |
new_eras[cnt].absolute_direction = -1; | |
else | |
if (new_eras[cnt].direction == (uint32_t) '+') | |
new_eras[cnt].absolute_direction = -1; | |
else | |
new_eras[cnt].absolute_direction = 1; | |
/* Skip numeric values. */ | |
ptr += sizeof (uint32_t) * 8; | |
/* Set and skip era name. */ | |
new_eras[cnt].era_name = ptr; | |
ptr = strchr (ptr, '\0') + 1; | |
/* Set and skip era format. */ | |
new_eras[cnt].era_format = ptr; | |
ptr = strchr (ptr, '\0') + 1; | |
ptr += 3 - (((ptr - (const char *) base_ptr) + 3) & 3); | |
/* Set and skip wide era name. */ | |
new_eras[cnt].era_wname = (wchar_t *) ptr; | |
ptr = (char *) (__wcschr ((wchar_t *) ptr, L'\0') + 1); | |
/* Set and skip wide era format. */ | |
new_eras[cnt].era_wformat = (wchar_t *) ptr; | |
ptr = (char *) (__wcschr ((wchar_t *) ptr, L'\0') + 1); | |
} | |
} | |
} | |
data->era_initialized = 1; | |
} | |
out: | |
__libc_rwlock_unlock (__libc_setlocale_lock); | |
} | |
struct era_entry * | |
internal_function | |
_nl_get_era_entry (const struct tm *tp, struct __locale_data *current) | |
{ | |
if (current->private.time == NULL || !current->private.time->era_initialized) | |
_nl_init_era_entries (current); | |
if (current->private.time != NULL) | |
{ | |
/* Now compare date with the available eras. */ | |
const int32_t tdate[3] = { tp->tm_year, tp->tm_mon, tp->tm_mday }; | |
size_t cnt; | |
for (cnt = 0; cnt < current->private.time->num_eras; ++cnt) | |
if ((ERA_DATE_CMP (current->private.time->eras[cnt].start_date, tdate) | |
&& ERA_DATE_CMP (tdate, | |
current->private.time->eras[cnt].stop_date)) | |
|| (ERA_DATE_CMP (current->private.time->eras[cnt].stop_date, | |
tdate) | |
&& ERA_DATE_CMP (tdate, | |
current->private.time->eras[cnt].start_date))) | |
return ¤t->private.time->eras[cnt]; | |
} | |
return NULL; | |
} | |
struct era_entry * | |
internal_function | |
_nl_select_era_entry (int cnt, struct __locale_data *current) | |
{ | |
if (current->private.time == NULL || !current->private.time->era_initialized) | |
_nl_init_era_entries (current); | |
return (current->private.time == NULL | |
? NULL : ¤t->private.time->eras[cnt]); | |
} |