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/* Iterator for inserting thousands separators into numbers.
Copyright (C) 2022-2024 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
<https://www.gnu.org/licenses/>. */
#include <grouping_iterator.h>
#include <assert.h>
#include <limits.h>
#include <locale/localeinfo.h>
#include <stdint.h>
#include <string.h>
/* Initializes *IT with no grouping information for a string of length
DIGITS, and return false to indicate no grouping. */
bool
__grouping_iterator_init_none (struct grouping_iterator *it,
unsigned int digits)
{
memset (it, 0, sizeof (*it));
it->remaining_in_current_group = digits;
it->remaining = digits;
return false;
}
static bool
grouping_iterator_setup (struct grouping_iterator *it, unsigned int digits,
const char *grouping)
{
/* We treat all negative values like CHAR_MAX. */
if (*grouping == CHAR_MAX || *grouping <= 0)
/* No grouping should be done. */
return __grouping_iterator_init_none (it, digits);
unsigned int remaining_to_group = digits;
unsigned int non_repeating_groups = 0;
unsigned int groups = 0;
while (true)
{
non_repeating_groups += *grouping;
if (remaining_to_group <= (unsigned int) *grouping)
break;
++groups;
remaining_to_group -= *grouping++;
if (*grouping == CHAR_MAX
#if CHAR_MIN < 0
|| *grouping < 0
#endif
)
/* No more grouping should be done. */
break;
else if (*grouping == 0)
{
/* Same grouping repeats. */
--grouping;
non_repeating_groups -= *grouping; /* Over-counted. */
unsigned int repeats = (remaining_to_group - 1) / *grouping;
groups += repeats;
remaining_to_group -= repeats * *grouping;
break;
}
}
it->remaining_in_current_group = remaining_to_group;
it->remaining = digits;
it->groupings = grouping;
it->non_repeating_groups = non_repeating_groups;
it->separators = groups;
return it->separators > 0;
}
/* Returns the appropriate grouping item in LOC depending on CATEGORY
(which must be LC_MONETARY or LC_NUMERIC). */
static const char *
get_grouping (int category, locale_t loc)
{
return _nl_lookup (loc, category,
category == LC_MONETARY ? MON_GROUPING : GROUPING);
}
bool
__grouping_iterator_init (struct grouping_iterator *it,
int category, locale_t loc, unsigned int digits)
{
if (digits <= 1)
return __grouping_iterator_init_none (it, digits);
else
return grouping_iterator_setup (it, digits, get_grouping (category, loc));
}
bool
__grouping_iterator_next (struct grouping_iterator *it)
{
assert (it->remaining > 0);
--it->remaining;
if (it->remaining_in_current_group > 0)
{
--it->remaining_in_current_group;
return false;
}
/* If we are in the non-repeating part, switch group. */
if (it->remaining < it->non_repeating_groups)
--it->groupings;
it->remaining_in_current_group = *it->groupings - 1;
return true;
}
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