1 /* str/count.c - Count the instances of a character set
2 * Copyright (C) 2001,2005 Bruce Guenter <bruce@untroubled.org>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "str.h"
19
20 /** Count the number of instances of a list of characters */
str_countof(const str * s,const char * list)21 unsigned str_countof(const str* s, const char* list)
22 {
23 const char* ptr;
24 unsigned pos;
25 unsigned count;
26 int map[256];
27
28 str_buildmap(map, list);
29 count = 0;
30 for (pos = 0, ptr = s->s; pos < s->len; ++ptr, ++pos)
31 if (map[*(unsigned char*)ptr] >= 0) ++count;
32 return count;
33 }
34