/*
 * This code is from "Algorithms in C, Third Edition,"
 * by Robert Sedgewick, Addison Wesley Longman, 1998.
 */
int hashU(char *v, int M)
  { int h, a = 31415, b = 27183;
    for (h = 0; *v != '\0'; v++, a = a*b % (M-1)) 
        h = (a*h + *v) % M;
    return h;
  }