/* PORTIO.H - I/O buffer data type and related definitions for use
  with the I/O routines in PORTIO.C.  */

struct iobuf {
       int fd;
       int isect;                      /* currently buffered sector */
       int nextc;                      /* index of next char in buffer */
       char written;                   /* anything written in current sector? */
       char buff [128];
       };
#define ABSOLUTE        0               /* seek codes */
#define RELATIVE        1

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