1 /* Determine the number of screen columns needed for a character.
2 Copyright (C) 2006 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 2, or (at your option)
7 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, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
17
18 #ifndef _gl_WCWIDTH_H
19 #define _gl_WCWIDTH_H
20
21 #if HAVE_WCHAR_T
22
23 /* Get wcwidth if available, along with wchar_t. */
24 # if HAVE_WCHAR_H
25 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
26 <wchar.h>.
27 BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
28 <wchar.h>. */
29 # include <stdio.h>
30 # include <time.h>
31 # include <wchar.h>
32 # endif
33
34 /* Get iswprint. */
35 # if HAVE_WCTYPE_H
36 # include <wctype.h>
37 # endif
38 # if !defined iswprint && !HAVE_ISWPRINT
39 static inline int
40 # if HAVE_WINT_T
iswprint(wint_t wc)41 iswprint (wint_t wc)
42 # else
43 iswprint (int wc)
44 # endif
45 {
46 return (wc >= 0 && wc < 128
47 ? wc >= ' ' && wc <= '~'
48 : 1);
49 }
50 # define iswprint iswprint
51 # endif
52
53 # ifndef HAVE_DECL_WCWIDTH
54 "this configure-time declaration test was not run"
55 # endif
56 # ifndef wcwidth
57 # if !HAVE_WCWIDTH
58
59 /* wcwidth doesn't exist, so assume all printable characters have
60 width 1. */
61 static inline int
62 wcwidth (wchar_t wc)
63 {
64 return wc == 0 ? 0 : iswprint (wc) ? 1 : -1;
65 }
66
67 # elif !HAVE_DECL_WCWIDTH
68
69 /* wcwidth exists but is not declared. */
70 extern
71 # ifdef __cplusplus
72 "C"
73 # endif
74 int wcwidth (int /* actually wchar_t */);
75
76 # endif
77 # endif
78
79 #endif /* HAVE_WCHAR_H */
80
81 #endif /* _gl_WCWIDTH_H */
82