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

 #include   <dos.h>

 unsigned   FP_OFF(longptr);
 char 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:    An unsigned integer value representing an offset.

      Notes:    FP_OFF() is a macro.

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

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

          #include <dos.h>

          char far *ptr;
          unsigned int off_val;

          main()
          {
               off_val = FP_OFF(ptr);
               FP_OFF(ptr) = ++off_val
               if off_val == 0
                   perror("Segment Wrap caused by incrementing offset")
          }