1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
/* $OpenBSD: utf8.c,v 1.1 2018/07/29 11:27:15 schwarze Exp $ */
/*
* Copyright (c) 2018 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <wchar.h>
/*
* Measure the display width of the multibyte string.
* Treat invalid bytes and non-printable characters as width 1.
* Truncate the string to a display width of maxwidth.
* Return the total width, possibly after truncation.
*/
int
mbswidth_truncate(char *mbs, int maxwidth)
{
wchar_t wc;
int len, width, sum;
sum = 0;
while (*mbs != '\0') {
if ((len = mbtowc(&wc, mbs, MB_CUR_MAX)) == -1)
len = width = 1;
else if ((width = wcwidth(wc)) < 0)
width = 1;
if (sum + width > maxwidth) {
*mbs = '\0';
break;
}
sum += width;
mbs += len;
}
return sum;
}
|
