mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-24 14:00:30 +00:00
127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/* 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;
|
|
}
|