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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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13
include/printf.h
View File

@ -53,7 +53,18 @@ int __wprintf_function_invoke (void *, printf_function callback,
#include <bits/types/locale_t.h>
/* Now define the internal interfaces. */
/* Returns the width (as for printf, in bytes) of the converted ASCII
number in the characters in the range [FIRST, LAST). The range
must only contain ASCII digits. The caller is responsible for
avoiding overflow.
This function is used during non-wide digit translation. Wide
digit translate produces one wide character per ASCII digit,
so the width is simply LAST - FIRST. */
int __translated_number_width (locale_t loc,
const char *first, const char *last)
attribute_hidden;
extern int __printf_fphex (FILE *, const struct printf_info *,
const void *const *) attribute_hidden;
extern int __printf_fp (FILE *, const struct printf_info *,

1
stdio-common/Makefile
View File

@ -85,6 +85,7 @@ routines := \
tmpfile64 \
tmpnam \
tmpnam_r \
translated_number_width \
vfprintf \
vfprintf-internal \
vfscanf \

42
stdio-common/translated_number_width.c Normal file
View File

@ -0,0 +1,42 @@
/* 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;
}
}