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() gets or sets the offset portion of the far pointer
    'longptr'.

       Returns:     An unsigned integer representing an offset.

         Notes:     FP_OFF() is a macro.

   Portability:     MS-DOS only.

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

    The following example gets the segment and offset portion of a far
    pointer and increments the offset 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);
           }