Listing 7 Definitions for graphics routines

/*************************************************
 * USRDEF.H -- additions to <stddef.h>
 *
 * last revised:   02/28/93
 ************************************************/

#define SEEN_USRDEF
#define SEEN_USRDEF

/* condition codes */

#define FALSE   0
#define TRUE    !FALSE

#define OK      0
#define FAIL   --1

/* synonym types */

typedef unsigned char Byte;
typedef int Boolean;
#endif