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 FP_OFF()                Get or Set Offset Portion of a Far Pointer (Macro)

 #include   <dos.h>

 unsigned   FP_OFF(longptr);
 void far   *longptr;                    Long pointer to memory address

    FP_OFF() is a macro that can be used to get or set the offset portion
    of the far pointer 'longptr'.

    Returns:    The offset as an unsigned integer value.

 Portability:   Applies to MS DOS only.

   -------------------------------- Example ---------------------------------

    The following example gets the offset portion of a far pointer and
    increments it by one.

           #include <dos.h>

           void far *ptr;
           unsigned int off_val, seg_val;

           main()
           {
                seg_val = FP_SEG(ptr);
                off_val = FP_OFF(ptr);
                FP_OFF(ptr) = ++off_val;
                printf("%04x:%04x",seg_val,off_val);
           }