56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* wcsnwidth.c - compute display width of wide character string, up to max
|
|
specified width, return length. */
|
|
|
|
/* Copyright (C) 2012 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Bash, the Bourne Again SHell.
|
|
|
|
Bash is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Bash 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with Bash. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#if defined (HANDLE_MULTIBYTE)
|
|
|
|
#include <stdc.h>
|
|
#include <wchar.h>
|
|
#include <bashansi.h>
|
|
|
|
/* Return the number of wide characters that will be displayed from wide string
|
|
PWCS. If the display width exceeds MAX, return the number of wide chars
|
|
from PWCS required to display MAX characters on the screen. */
|
|
int
|
|
wcsnwidth(pwcs, n, max)
|
|
const wchar_t *pwcs;
|
|
size_t n, max;
|
|
{
|
|
wchar_t wc, *ws;
|
|
int len, l;
|
|
|
|
len = 0;
|
|
ws = (wchar_t *)pwcs;
|
|
while (n-- > 0 && (wc = *ws++) != L'\0')
|
|
{
|
|
l = wcwidth (wc);
|
|
if (l < 0)
|
|
return (-1);
|
|
else if (l == max - len)
|
|
return (ws - pwcs);
|
|
else if (l > max - len)
|
|
return (--ws - pwcs);
|
|
len += l;
|
|
}
|
|
return (ws - pwcs);
|
|
}
|
|
#endif
|