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
33extern "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 */
51extern int mbswidth (const char *string, int flags);
52
53/* Returns the number of screen columns needed for the NBYTES bytes
54 starting at BUF. */
55extern int mbsnwidth (const char *buf, size_t nbytes, int flags);
56
57
58#ifdef __cplusplus
59}
60#endif
61