/**
*
* The following structure is a UNIX file block that retains information about
* a file being accessed via the level 1 I/O functions.
*/
struct UFB
{
char ufbflg;          /* flags */
char ufbtyp;          /* device type */
char *ufbfh;
};

#define NUFBS 20      /* number of UFBs defined */


/*
*
* UFB.ufbflg definitions
*
*/
#define UFB_OP 0x80   /* file is open */
#define UFB_RA 0x40   /* reading is allowed */
#define UFB_WA 0x20   /* writing is allowed */
#define UFB_NT 0x10   /* access file with no translation */
#define UFB_AP 8      /* append mode flag */
/*
*
* UFB.ufbtyp definitions
*
*/
#define D_DISK 0
#define D_CON 1
#define D_PRN 2
#define D_AUX 3
#define D_NULL 4