#: 17866 S12/OS9/68000 (OSK)
    05-Apr-93  03:52:25
Sb: C help
Fm: Bob Taylor 73270,3124
To: all

I need help with the following integer with the top 4 bits used as flags and
the bottom 12 bits a signed integer. I haven't been able to correctly sign
extend. Could an expert help?

Thanks,
Bob

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  typedef unsigned int CTYPE;

  #define MODE_BIT   0x8000
  #define VM_BIT     0x4000
  #define HM_BIT     0x2000

  #define MOTION(amt)  ( ((CTYPE)(amt) & 0xfff) | (MODE_BIT) | HM_BIT) ) ???
  #define MVAL(c)      ( (int) ((c) & 0xfff ) )   ?????????