From 46378560e056300623364669de2405a7182b064f Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Mon, 19 Dec 2022 18:56:54 +0100 Subject: stdio-common: Add __translated_number_width This function will be used to compute the width of a number after i18n digit translation. Reviewed-by: Adhemerval Zanella --- stdio-common/Makefile | 1 + stdio-common/translated_number_width.c | 42 ++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+) create mode 100644 stdio-common/translated_number_width.c (limited to 'stdio-common') diff --git a/stdio-common/Makefile b/stdio-common/Makefile index 6e6da091b1..3e0c574ca5 100644 --- a/stdio-common/Makefile +++ b/stdio-common/Makefile @@ -85,6 +85,7 @@ routines := \ tmpfile64 \ tmpnam \ tmpnam_r \ + translated_number_width \ vfprintf \ vfprintf-internal \ vfscanf \ diff --git a/stdio-common/translated_number_width.c b/stdio-common/translated_number_width.c new file mode 100644 index 0000000000..f42d5968a1 --- /dev/null +++ b/stdio-common/translated_number_width.c @@ -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 + . */ + +#include +#include +#include +#include + +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; + } +} -- cgit 1.4.1