/* cpybuf - copy buffer "s" to "d" for "n" bytes */
cpy_buf (d, s, n)
/***************/
   char *d, *s;
   int n;
   {
   int i;

   for (i = n; i != 0; --i)
       *d++ = *s++;
   return (n);
   }  /* cpy_buf */