/* returns the position of the rightmost occurrence of t in s, or -1
 * if there is none
 */

int strrindex(char s[], char t[]) {
     int pos, i;

     pos = -1;
     for (i = 0; s[i] != '\0'; i++) {
	  for (j=i, k=0; s[j] == t[k] && t[k] != '\0'; j++, k++)
	       ;
	  if (k > 0 && t[k] == '\0')
	       pos = i;
     }

     return pos;
}