sdiff: fix wcwidth recursion
[dragonfly.git] / contrib / diffutils / lib / wcwidth.c
CommitLineData
44b87433
JM
1/* Determine the number of screen columns needed for a character.
2 Copyright (C) 2006-2007, 2010 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
16
17#include <config.h>
18
19/* Specification. */
20#include <wchar.h>
d76863bd 21#include <gnuwidechar.h>
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22
23/* Get iswprint. */
24#include <wctype.h>
25
26#include "localcharset.h"
27#include "streq.h"
28#include "uniwidth.h"
29
30int
d76863bd 31special_wcwidth (wchar_t wc)
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32{
33 /* In UTF-8 locales, use a Unicode aware width function. */
34 const char *encoding = locale_charset ();
35 if (STREQ (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0 ,0))
36 {
37 /* We assume that in a UTF-8 locale, a wide character is the same as a
38 Unicode character. */
39 return uc_width (wc, encoding);
40 }
41 else
42 {
43 /* Otherwise, fall back to the system's wcwidth function. */
44#if HAVE_WCWIDTH
45 return wcwidth (wc);
46#else
47 return wc == 0 ? 0 : iswprint (wc) ? 1 : -1;
48#endif
49 }
50}