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/* Determine display width of UTF-16 string.
Copyright (C) 2001-2002, 2006-2007, 2009-2015 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This program 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 program 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 <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "uniwidth.h"
#include "unistr.h"
int
u16_width (const uint16_t *s, size_t n, const char *encoding)
{
const uint16_t *s_end = s + n;
int width = 0;
while (s < s_end)
{
ucs4_t uc;
int w;
s += u16_mbtouc_unsafe (&uc, s, s_end - s);
if (uc == 0)
break; /* end of string reached */
w = uc_width (uc, encoding);
if (w >= 0) /* ignore control characters in the string */
width += w;
}
return width;
}
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