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stdio-common: Add __translated_number_width

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This function will be used to compute the width of a number
after i18n digit translation.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2022-12-19 18:56:54 +01:00
parent c7bf2e99ca
commit 46378560e0
3 changed files with 55 additions and 1 deletions
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42
stdio-common/translated_number_width.c Normal file
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/* Compute the printf width of a sequence of ASCII digits.
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/>. */
#include <assert.h>
#include <limits.h>
#include <locale/localeinfo.h>
#include <printf.h>
int
__translated_number_width (locale_t loc, const char *first, const char *last)
{
struct lc_ctype_data *ctype = loc->__locales[LC_CTYPE]->private;
if (ctype->outdigit_bytes_all_equal > 0)
return (last - first) * ctype->outdigit_bytes_all_equal;
else
{
/* Digits have varying length, so the fast path cannot be used. */
int digits = 0;
for (const char *p = first; p < last; ++p)
{
assert ('0' <= *p && *p <= '9');
digits += ctype->outdigit_bytes[*p - '0'];
}
return digits;
}
}