50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* Determine the number of screen columns needed for a character.
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Copyright (C) 2006-2007, 2010-2013 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <wchar.h>
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/* Get iswprint. */
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#include <wctype.h>
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#include "localcharset.h"
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#include "streq.h"
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#include "uniwidth.h"
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int
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wcwidth (wchar_t wc)
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#undef wcwidth
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{
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/* In UTF-8 locales, use a Unicode aware width function. */
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const char *encoding = locale_charset ();
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if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0 ,0))
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{
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/* We assume that in a UTF-8 locale, a wide character is the same as a
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Unicode character. */
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return uc_width (wc, encoding);
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}
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else
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{
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/* Otherwise, fall back to the system's wcwidth function. */
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#if HAVE_WCWIDTH
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return wcwidth (wc);
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#else
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return wc == 0 ? 0 : iswprint (wc) ? 1 : -1;
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#endif
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}
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}
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