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/* Determine number of screen columns needed for a size-bounded wide string.
Copyright (C) 1999, 2011-2025 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 2.1 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
FUNC (const UNIT *s, size_t n)
{
int count = 0;
for (; n > 0; s++, n--)
{
UNIT c = *s;
if (c == (UNIT)'\0')
break;
{
int width = CHARACTER_WIDTH (c);
if (width < 0)
goto found_nonprinting;
if (width > INT_MAX - count)
goto overflow;
count += width;
}
}
return count;
/* The total width has become > INT_MAX.
Continue searching for a non-printing wide character. */
for (; n > 0; s++, n--)
{
UNIT c = *s;
if (c == (UNIT)'\0')
break;
{
int width = CHARACTER_WIDTH (c);
if (width < 0)
goto found_nonprinting;
}
overflow: ;
}
return INT_MAX;
found_nonprinting:
return -1;
}
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