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/* Determine the number of screen columns needed for a character.
Copyright (C) 2006, 2007 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 <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <wchar.h>
/* Get iswprint. */
#include <wctype.h>
#if HAVE_LANGINFO_CODESET
# include <langinfo.h>
#endif
#include "localcharset.h"
#include "streq.h"
#include "uniwidth.h"
#undef wcwidth
#include "uniwidth/cjk.h"
static char cached_encoding[32];
static int cached_is_cjk_encoding;
static int cached_is_utf8_encoding;
static const char *locale_charset_simple ()
{
#if HAVE_LANGINFO_CODESET
/* Most systems support nl_langinfo (CODESET) nowadays. */
return nl_langinfo (CODESET);
# else
/* Do the complex case */
return locale_charset ();
# endif
}
static void cache_encoding ()
{
const char *encoding = locale_charset_simple ();
if (!strncmp(encoding, cached_encoding, sizeof (cached_encoding)))
return;
strncpy (cached_encoding, encoding, sizeof (cached_encoding));
encoding = locale_charset ();
cached_is_utf8_encoding = STREQ (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0 ,0);
cached_is_cjk_encoding = is_cjk_encoding (encoding);
}
int
rpl_wcwidth (wchar_t wc)
{
cache_encoding ();
/* In UTF-8 locales, use a Unicode aware width function. */
if (cached_is_utf8_encoding || cached_is_cjk_encoding)
{
/* We assume that in a UTF-8 locale, a wide character is the same as a
Unicode character. */
return uc_width (wc, cached_is_cjk_encoding);
}
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
}
}
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