blob: e9da91a19e332bd2ed18bf5c68b4f5614b824908 (
plain)
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
|
/* Determine number of screen columns needed for a size-bounded wide string.
Copyright (C) 1999, 2011-2022 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 1999.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
int
wcswidth (const wchar_t *s, size_t n)
{
int count = 0;
for (; n > 0; s++, n--)
{
wchar_t c = *s;
if (c == (wchar_t)'\0')
break;
{
int width = wcwidth (c);
if (width < 0)
goto found_nonprinting;
if (width > INT_MAX - count)
goto overflow;
count += width;
}
}
return count;
found_nonprinting:
return -1;
overflow:
return INT_MAX;
}
|
