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/* Helper functions used by strftime/strptime to handle alternate digits.
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Copyright (C) 1995-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include "../locale/localeinfo.h"
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#include <libc-lock.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <string.h>
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#include <stdint.h>
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/* Some of the functions here must not be used while setlocale is called. */
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__libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden)
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#define CURRENT(item) (current->values[_NL_ITEM_INDEX (item)].string)
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#define CURRENT_WSTR(item) \
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((wchar_t *) current->values[_NL_ITEM_INDEX (item)].wstr)
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static void
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_nl_init_alt_digit (struct __locale_data *current)
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{
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struct lc_time_data *data;
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if (current->private.time == NULL)
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{
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current->private.time = malloc (sizeof *current->private.time);
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if (current->private.time == NULL)
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return;
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memset (current->private.time, 0, sizeof *current->private.time);
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current->private.cleanup = &_nl_cleanup_time;
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}
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data = current->private.time;
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if (! data->alt_digits_initialized)
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{
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const char *ptr = CURRENT (ALT_DIGITS);
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size_t cnt;
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data->alt_digits_initialized = 1;
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if (ptr != NULL)
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{
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data->alt_digits = malloc (100 * sizeof (const char *));
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if (data->alt_digits != NULL)
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for (cnt = 0; cnt < 100; ++cnt)
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{
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data->alt_digits[cnt] = ptr;
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/* Skip digit format. */
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ptr = strchr (ptr, '\0') + 1;
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}
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}
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}
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}
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const char *
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_nl_get_alt_digit (unsigned int number, struct __locale_data *current)
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{
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const char *result;
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if (number >= 100 || CURRENT (ALT_DIGITS)[0] == '\0')
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return NULL;
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__libc_rwlock_wrlock (__libc_setlocale_lock);
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if (current->private.time == NULL
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|| ! current->private.time->alt_digits_initialized)
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_nl_init_alt_digit (current);
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result = ((current->private.time != NULL
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&& current->private.time->alt_digits != NULL)
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? current->private.time->alt_digits[number]
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: NULL);
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__libc_rwlock_unlock (__libc_setlocale_lock);
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return result;
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}
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const wchar_t *
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_nl_get_walt_digit (unsigned int number, struct __locale_data *current)
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{
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const wchar_t *result = NULL;
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struct lc_time_data *data;
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if (number >= 100 || CURRENT_WSTR (_NL_WALT_DIGITS)[0] == L'\0')
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return NULL;
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__libc_rwlock_wrlock (__libc_setlocale_lock);
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if (current->private.time == NULL)
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{
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current->private.time = malloc (sizeof *current->private.time);
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if (current->private.time == NULL)
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goto out;
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memset (current->private.time, 0, sizeof *current->private.time);
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current->private.cleanup = &_nl_cleanup_time;
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}
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data = current->private.time;
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if (! data->walt_digits_initialized)
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{
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const wchar_t *ptr = CURRENT_WSTR (_NL_WALT_DIGITS);
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size_t cnt;
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data->walt_digits_initialized = 1;
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if (ptr != NULL)
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{
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data->walt_digits = malloc (100 * sizeof (const uint32_t *));
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if (data->walt_digits != NULL)
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for (cnt = 0; cnt < 100; ++cnt)
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{
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data->walt_digits[cnt] = ptr;
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/* Skip digit format. */
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ptr = __wcschr (ptr, L'\0') + 1;
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}
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}
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}
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if (data->walt_digits != NULL)
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result = data->walt_digits[number];
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out:
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__libc_rwlock_unlock (__libc_setlocale_lock);
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return (wchar_t *) result;
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}
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int
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_nl_parse_alt_digit (const char **strp, struct __locale_data *current)
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{
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const char *str = *strp;
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int result = -1;
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size_t cnt;
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size_t maxlen = 0;
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if (CURRENT_WSTR (_NL_WALT_DIGITS)[0] == L'\0')
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return result;
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__libc_rwlock_wrlock (__libc_setlocale_lock);
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if (current->private.time == NULL
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|| ! current->private.time->alt_digits_initialized)
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_nl_init_alt_digit (current);
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if (current->private.time != NULL &&
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current->private.time->alt_digits != NULL)
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/* Matching is not unambiguous. The alternative digits could be like
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I, II, III, ... and the first one is a substring of the second
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and third. Therefore we must keep on searching until we found
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the longest possible match. Note that this is not specified in
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the standard. */
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for (cnt = 0; cnt < 100; ++cnt)
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{
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const char *const dig = current->private.time->alt_digits[cnt];
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size_t len = strlen (dig);
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if (len > maxlen && strncmp (dig, str, len) == 0)
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{
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maxlen = len;
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result = (int) cnt;
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}
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}
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__libc_rwlock_unlock (__libc_setlocale_lock);
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if (result != -1)
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*strp += maxlen;
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return result;
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}
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