usr/src/usr.bin/telnet/defines.h

#define settimer(x)     clocks.x = clocks.system++

#if     !defined(TN3270)

#define ExitString(f,s,r)       { fprintf(f, s); exit(r); }
#define Exit(x)                 exit(x)
#define SetIn3270()

#endif  /* !defined(TN3270) */

#define NETADD(c)       { *nfrontp++ = c; }
#define NET2ADD(c1,c2)  { NETADD(c1); NETADD(c2); }
#define NETLOC()        (nfrontp)
#define NETMAX()        (netobuf+sizeof netobuf-1)
#define NETBYTES()      (nfrontp-nbackp)
#define NETROOM()       (NETMAX()-NETLOC()+1)

#define TTYADD(c)       { if (!(SYNCHing||flushout)) { *tfrontp++ = c; } }
#define TTYLOC()        (tfrontp)
#define TTYMAX()        (ttyobuf+sizeof ttyobuf-1)
#define TTYMIN()        (netobuf)
#define TTYBYTES()      (tfrontp-tbackp)
#define TTYROOM()       (TTYMAX()-TTYLOC()+1)

/*      Various modes */
#define MODE_LINE(m)    (modelist[m].modetype & LINE)
#define MODE_LOCAL_CHARS(m)     (modelist[m].modetype &  LOCAL_CHARS)
#define MODE_LOCAL_ECHO(m)      (modelist[m].modetype & LOCAL_ECHO)
#define MODE_COMMAND_LINE(m)    (modelist[m].modetype & COMMAND_LINE)

#define LOCAL_CHARS     0x01            /* Characters processed locally */
#define LINE            0x02            /* Line-by-line mode of operation */
#define LOCAL_ECHO      0x04            /* Echoing locally */
#define COMMAND_LINE    0x08            /* Command line mode */