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/* Determine display width of UTF-16 string.
Copyright (C) 2001-2002, 2006-2007, 2009-2022 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version, or
- the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
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 and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://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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