diff options
Diffstat (limited to 'time/era.c')
| -rw-r--r-- | time/era.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/time/era.c b/time/era.c new file mode 100644 index 0000000000..a8d2237338 --- /dev/null +++ b/time/era.c @@ -0,0 +1,177 @@ +/* Helper functions used by strftime/strptime to handle locale-specific "eras". + Copyright (C) 1995-2001,02 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include "../locale/localeinfo.h" +#include <bits/libc-lock.h> +#include <stdlib.h> +#include <wchar.h> +#include <string.h> + +/* Some of the functions here must not be used while setlocale is called. */ +__libc_lock_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_lock_lock (__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_lock_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]); +} |