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1 /* Determine the number of screen columns needed for a string.
2    Copyright (C) 2000-2004, 2007, 2009-2012 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 <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