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`ldiv'--divide two long integers

     #include <stdlib.h>
     ldiv_t ldiv(long N, long D);
Divide N/D, returning quotient and remainder as two long integers in a
structure `ldiv_t'.
The result is represented with the structure
      typedef struct
       long quot;
       long rem;
      } ldiv_t;
   where the `quot' field represents the quotient, and `rem' the
remainder.  For nonzero D, if ``R = ldiv(N,D);'' then N equals ``R.rem
+ D*R.quot''.
   To divide `int' rather than `long' values, use the similar function
`ldiv' is ANSI.
   No supporting OS subroutines are required.