1 | /* Determine the number of screen columns needed for a string. |
2 | Copyright (C) 2000-2004, 2007, 2009-2019 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 <https://www.gnu.org/licenses/>. */ |
16 | |
17 | #include <stddef.h> |
18 | |
19 | /* Avoid a clash of our mbswidth() with a function of the same name defined |
20 | in UnixWare 7.1.1 <wchar.h>. We need this #include before the #define |
21 | below. |
22 | However, we don't want to #include <wchar.h> on all platforms because |
23 | - Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before |
24 | <wchar.h>. |
25 | - BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before |
26 | <wchar.h>. */ |
27 | #if HAVE_DECL_MBSWIDTH_IN_WCHAR_H |
28 | # include <wchar.h> |
29 | #endif |
30 | |
31 | |
32 | #ifdef __cplusplus |
33 | extern "C" { |
34 | #endif |
35 | |
36 | |
37 | /* Optional flags to influence mbswidth/mbsnwidth behavior. */ |
38 | |
39 | /* If this bit is set, return -1 upon finding an invalid or incomplete |
40 | character. Otherwise, assume invalid characters have width 1. */ |
41 | #define MBSW_REJECT_INVALID 1 |
42 | |
43 | /* If this bit is set, return -1 upon finding a non-printable character. |
44 | Otherwise, assume unprintable characters have width 0 if they are |
45 | control characters and 1 otherwise. */ |
46 | #define MBSW_REJECT_UNPRINTABLE 2 |
47 | |
48 | |
49 | /* Returns the number of screen columns needed for STRING. */ |
50 | #define mbswidth gnu_mbswidth /* avoid clash with UnixWare 7.1.1 function */ |
51 | extern int mbswidth (const char *string, int flags); |
52 | |
53 | /* Returns the number of screen columns needed for the NBYTES bytes |
54 | starting at BUF. */ |
55 | extern int mbsnwidth (const char *buf, size_t nbytes, int flags); |
56 | |
57 | |
58 | #ifdef __cplusplus |
59 | } |
60 | #endif |
61 | |