/* str/count.c - Count the instances of a character set
* Copyright (C) 2001,2005 Bruce Guenter <bruce@untroubled.org>
*
* This library 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 library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "str.h"
/** Count the number of instances of a list of characters */
unsigned str_countof(const str* s, const char* list)
{
const char* ptr;
unsigned pos;
unsigned count;
int map[256];
str_buildmap(map, list);
count = 0;
for (pos = 0, ptr = s->s; pos < s->len; ++ptr, ++pos)
if (map[*(unsigned char*)ptr] >= 0) ++count;
return count;
}