int search( key, r )
     typekey key;  dataarray r;

     { int i, last;

     i = hashfunction( key ) ;
     last = (i+n-1) % m;
     while ( i!=last && !empty(r[i]) && r[i].k!=key )
          i = (i+1) % m;
     if (r[i].k==key)  return( i );
          else         return( -1 );
     }