/* str/buildmap.c - Build a lookup table for find*of functions
 * 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 <string.h>
#include "str.h"

/** Build a map from the list of characters.

Each byte in the output map contains either \c -1 if the corresponding
character was not present in the input string, or the offset of the last
instance of the character in the list.
*/
void str_buildmap(int map[256], const char* list)
{
  unsigned i;
  for (i = 0; i < 256; i++)
    map[i] = -1;
  for (i = 0; *list; i++, list++)
    map[*(unsigned char*)list] = i;
}