Mercurial > gnulib
view lib/wcwidth.c @ 40198:5a34193cbc07
long-options: add parse_gnu_standard_options_only
Discussed in https://bugs.gnu.org/33468 .
* lib/long-options.c (parse_long_options): Use EXIT_SUCCESS instead
of 0.
(parse_gnu_standard_options_only): Add function to
process the GNU default options --help and --version and fail for any other
unknown long or short option. See
https://gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html .
* lib/long-options.h (parse_gnu_standard_options_only): Declare it.
* modules/long-options (depends-on): Add stdbool, exitfail.
* top/maint.mk (sc_prohibit_long_options_without_use): Update
syntax-check rule, add new function name.
author | Bernhard Voelker <mail@bernhard-voelker.de> |
---|---|
date | Thu, 29 Nov 2018 09:06:26 +0100 |
parents | b06060465f09 |
children |
line wrap: on
line source
/* Determine the number of screen columns needed for a character. Copyright (C) 2006-2007, 2010-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ #include <config.h> /* Specification. */ #include <wchar.h> /* Get iswprint. */ #include <wctype.h> #include "localcharset.h" #include "streq.h" #include "uniwidth.h" /* Returns 1 if the current locale is an UTF-8 locale, 0 otherwise. */ static inline int is_locale_utf8 (void) { const char *encoding = locale_charset (); return STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0); } #if GNULIB_WCHAR_SINGLE /* When we know that the locale does not change, provide a speedup by caching the value of is_locale_utf8. */ static int cached_is_locale_utf8 = -1; static inline int is_locale_utf8_cached (void) { if (cached_is_locale_utf8 < 0) cached_is_locale_utf8 = is_locale_utf8 (); return cached_is_locale_utf8; } #else /* By default, don't make assumptions, hence no caching. */ # define is_locale_utf8_cached is_locale_utf8 #endif int wcwidth (wchar_t wc) #undef wcwidth { /* In UTF-8 locales, use a Unicode aware width function. */ if (is_locale_utf8_cached ()) { /* We assume that in a UTF-8 locale, a wide character is the same as a Unicode character. */ return uc_width (wc, "UTF-8"); } else { /* Otherwise, fall back to the system's wcwidth function. */ #if HAVE_WCWIDTH return wcwidth (wc); #else return wc == 0 ? 0 : iswprint (wc) ? 1 : -1; #endif } }