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