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locale: Implement struct grouping_iterator

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The iterator allows grouping while scanning forward through
the digits.  This enables emitting digits as they are processed.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2022-12-19 18:56:54 +01:00
parent edd1b2a0d9
commit ffde06c915
4 changed files with 461 additions and 1 deletions
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65
stdio-common/grouping_iterator.h Normal file
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/* Iterator for grouping a number while scanning it forward.
Copyright (C) 2022 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/>. */
#ifndef GROUPING_ITERATOR_H
#define GROUPING_ITERATOR_H
#include <locale.h>
#include <stdbool.h>
struct grouping_iterator
{
/* Number of characters in the current group. If this reaches zero,
a thousands separator needs to be emittted. */
unsigned int remaining_in_current_group;
/* Number of characters remaining in the number. This is used to
detect the start of the non-repeating groups. */
unsigned int remaining;
/* Points to the current grouping descriptor. */
const char *groupings;
/* Total number of characters in the non-repeating groups. */
unsigned int non_repeating_groups;
/* Number of separators that will be inserted if the whole number is
processed. (Does not change during iteration.) */
unsigned int separators;
};
struct __locale_data;
/* Initializes *IT with the data from LOCDATA (which must be for
LC_MONETARY or LC_NUMERIC). DIGITS is the length of the number.
Returns true if grouping is active, false if not. */
bool __grouping_iterator_init (struct grouping_iterator *it,
int category, locale_t loc,
unsigned int digits) attribute_hidden;
/* 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)
attribute_hidden;
/* Advances to the next character and returns true if a thousands
separator should be inserted before emitting it. */
bool __grouping_iterator_next (struct grouping_iterator *it);
#endif /* GROUPING_ITERATOR_H */