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SRI_NIC_PERM_SRC_3_19910112
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telnet/telnet.mrc
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TITLE TELNET Multi-Network User TELNET
SUBTTL Written by Mark Crispin - March 1979/MRC 22 July 1985
; Version components
TELWHO==0 ; who last edited TELNET (0=MRC)
TELVER==5 ; TELNET's release version (matches monitor's)
TELMIN==4 ; TELNET's minor version
TELEDT==^D944 ; TELNET's edit version
; TELNET is the user subsystem to communicate with other systems via a
; network. TELNET runs on TOPS-20 release 5.3 and later monitors. TELNET
; will not run on Tenex; the "Twenex" operating system is a figment of the
; imagination of certain individuals. There ain't no such thing as a free
; lunch.
;
; TELNET was written by Mark Crispin at Stanford University starting March
; 1979 and continuously enhanced since that time.
SUBTTL Definitions
SEARCH MACSYM,MONSYM ; system definitions
SALL ; suppress macro expansions
.DIRECTIVE FLBLST ; sane listings for ASCIZ, etc.
.TEXT "/NOINITIAL" ; suppress loading of JOBDAT
.TEXT "TELNET/SAVE" ; save as TELNET.EXE
.TEXT "/SYMSEG:PSECT:CODE" ; put symbol table and patch area in CODE
.REQUIRE HSTNAM ; host name routines
.REQUIRE SYS:MACREL ; MACSYM support routines
; Routines invoked externally
EXTERN $GTPRO,$GTLCL
EXTERN $GTHSN,$GTHNS,$PUPSN,$PUPNS,$CHSSN,$CHSNS,$DECSN,$DECNS
; Assembly switches
IFNDEF TPRPRT,<TPRPRT==^D23> ; Internet TELNET protocol port
IFNDEF NRTOBJ,<NRTOBJ==^D23> ; NRT object type (some sites may need 200)
IFNDEF FTXTND,<FTXTND==1> ; non-zero for unsupported "extended" features
IFNDEF DEFESC,<DEFESC==.CHCCF> ; default escape character
IFNDEF PDLLEN,<PDLLEN==^D100> ; stack lengths
IFNDEF TIMTCK,<TIMTCK==^D6> ; # of 5 second ticks before timeout
IFNDEF TTIBSZ,<TTIBSZ==^D50> ; size of TTY input buffer in words
IFNDEF TTOBSZ,<TTOBSZ==^D100> ; size of TTY output buffer in words
IFNDEF NTIBSZ,<NTIBSZ==^D100> ; size of NET input buffer in words
; ^^ ** can't be less than ^D32, see DECnet ICP
IFNDEF NTOBSZ,<NTOBSZ==^D50> ; size of NET output buffer in words
IFNDEF CMDBSZ,<CMDBSZ==^D30> ; size of command text buffer
IFNDEF ATMBSZ,<ATMBSZ==^D10> ; size of atom buffer
IFNDEF PURBEG,<PURBEG==100000> ; origin of pure code
IFNDEF DDTADR,<DDTADR=770000> ; well known entry address of DDT
; AC's
A=:1 ; JSYS, temporary AC's
B=:2
C=:3
D=:4
T=:5 ; non-JSYS temporary AC's
TT=:6
P=:17 ; stack pointer
; Pup Ethernet definitions (in case assembling with a non-Pup MONSYM)
; Pup SMON% functions
.SFDIR==:62 ; initialize Pup directory
.SFBUG==:64 ; enable/disable Pup bug logging
.SFPUP==:67 ; enable/disable Pup Ethernet
; Pup MTOPR% functions
.MOPEF==:20 ; send Mark
.MOPRM==:23 ; return most recent Mark byte
.MOPRA==:26 ; return abort data
; Pup GDSTS% flags
BS.MRK==:1B4 ; BSP Mark seen
BS.END==:1B5 ; BSP End seen
; Pup BSP Mark types
MK.DAT==:1 ; Data Mark
MK.TIM==:5 ; Timing Mark
MK.TMR==:6 ; Timing Mark reply
; Miscellaneous definitions
CH%PAR==200 ; parity bit
CH%CHR==^--CH%PAR ; character sans parity
SUBTTL Macro definitions
; Fatal assembly error macro
DEFINE .FATAL (MESSAGE) <
PASS2
PRINTX ?'MESSAGE
END
>;DEFINE .FATAL
; TELCMD protocol-command-list
; Sends a protocol command
DEFINE TELCMD (CMDLST) <
TELCM1 <CMDLST>
CALL NETFRC
>;DEFINE TELCMD
; Same as TELCMD, but don't do a NETFRC
DEFINE TELCM1 (CMDLST) <
SKIPN DEBUGP
IFSKP.
TMSG<*S*'CMDLST'*
>
ENDIF.
MOVEI B,[BYTE (9) CMDLST,777]
CALL NETSTR
>;DEFINE TELCM1
; TPC protocol-command-name,value
; Defines a protocol command and generates a string for it
DEFINE TPC (CODE,VALUE) <
CODE==VALUE
[ASCIZ/,'CODE'/]
>;DEFINE TPC
; CMD command-name
; Generates an entry in a keyword table
DEFINE CMD (COMMAND) <[ASCIZ/COMMAND/],,.'COMMAND>
; PARSE FLDDB.-list
; Parses the specified FLDDB., skip returns if successful parse
DEFINE PARSE (DATA) <
PARSEA <[FLDDB. DATA]>
>;DEFINE PARSE
; PARSEA address
; Parses an FLDDB. item found at the specified address. Skip returns if
; successful parse
DEFINE PARSEA (ADDR) <
MOVEI B,ADDR ;; load function block
COMND% ;; this is the only COMND% in the source!
ERJMP ERROR ;; some cases legitimately fail
TXNE A,CM%NOP ;; skip if success
>;DEFINE PARSEA
; NOISE noise-word-string
; Outputs a noise word string if appropriate
DEFINE NOISE (STRING) <
PARSE <.CMNOI,,<-1,,[ASCIZ/STRING/]>>
JRST ERROR
>;DEFINE NOISE
; CONFIRM
; Requires carriage return confirmation, finishes up command parse
DEFINE CONFIRM <
PARSE <.CMCFM>
JRST ERROR
>;DEFINE CONFIRM
; EMSG string
; Types out an error message
DEFINE EMSG (STRING) <
HRROI A,[ASCIZ/'STRING'/]
ESOUT%
SKIPE TAKEP
CALL UNTAKE
>;DEFINE EMSG
; ERMSG string
; Types out an error message and RETs
DEFINE ERMSG (STRING) <
IFNSK.
EMSG <STRING>
RET
ENDIF.
>;DEFINE ERMSG
; ERNOP
; Ignores a JSYS error
DEFINE ERNOP <ERJMP .+1>
; REPORT flag,false-string,true-string
; Prints appropriate string depending upon status of flag
DEFINE REPORT (FLAG,FSTR,TSTR) <
SKIPN FLAG
SKIPA A,[-1,,[ASCIZ/
'FSTR'/]]
HRROI A,[ASCIZ/
'TSTR'/]
PSOUT%
>;DEFINE REPORT
SUBTTL Data area
LOC 20 ; low core for PC/AC storage
FATACS: BLOCK 20 ; AC save area for FATAL routine
IF1,<IFN <.-40>,<.FATAL .JBUUO in wrong location>>
.JBUUO: BLOCK 1 ; instruction stored here on UUO execution
.JB41: JSR UUOPC ; instruction executed on LUUO
IN1ACS: BLOCK 20 ; PSI level 1 AC save area
LEV1PC: BLOCK 1 ; PSI level 1 PC
LEV2PC: BLOCK 1 ; PSI level 2 PC
LEV3PC: BLOCK 1 ; PSI level 3 PC
REENTP: BLOCK 1 ; -1 => invoked by REENTER command
ESCCHR: BLOCK 1 ; escape character
TTYMOD: BLOCK 1 ; virgin TTY mode
TTYCOC: BLOCK 1 ; virgin TTY COC words
TTYTIW: BLOCK 1 ; virgin TTY interrupt word
UUOPC: BLOCK 1 ; PC of LUUO
MOVEM 17,FATACS+17 ; save AC's in FATACS for debugging
MOVEI 17,FATACS ; save from 0 => FATACS
BLT 17,FATACS+16 ; ...to 16 => FATACS+16
MOVE 17,FATACS+17 ; restore AC17
EMSG <Invalid instruction >
MOVX A,.PRIOU ; output the losing LUUO
MOVE B,.JBUUO
MOVX C,^D8 ; in octal
NOUT%
NOP
TMSG < at >
HRRZ TT,UUOPC
CALL SYMOUT
JRST DEATH ; now die
BLOCK <116-.> ; free space here
.JBSYM: BLOCK 1 ; symbol table from LINK
.JBUSY: BLOCK 1 ; undefined symbol table from LINK
IN2ACS: BLOCK 20 ; PSI level 2 AC save area
RELOC ; .LOW. PSECT
.PSECT DATA,1000 ; enter data PSECT
PDL: BLOCK PDLLEN ; main program stack
RPDL: BLOCK PDLLEN ; receive fork stack
CORBEG==. ; first loc zeroed in main loop
; Flags
TTYINP: BLOCK 1 ; -1 => terminal TTYINI'd
NOCMDP: BLOCK 1 ; -1 => NO command seen
CHAOSP: BLOCK 1 ; -1 => Chaosnet connection
DCNP: BLOCK 1 ; -1 => DECnet connection
PUPP: BLOCK 1 ; -1 => Pup Ethernet connection
INTP: BLOCK 1 ; -1 => Internet connection
TTYP: BLOCK 1 ; -1 => TTY connection
TPROTP: BLOCK 1 ; -1 => using TELNET protocol
NETCMP: BLOCK 1 ; -1 => IAC in progress
WILLP: BLOCK 1 ; -1 => IAC WILL in progress
WONTP: BLOCK 1 ; -1 => IAC WONT in progress
DOP: BLOCK 1 ; -1 => IAC DO in progress
DONTP: BLOCK 1 ; -1 => IAC DONT in progress
ECHOP: BLOCK 1 ; -1 => remote host is echoing
SUPGAP: BLOCK 1 ; -1 => suppress GA mode
RCBINP: BLOCK 1 ; -1 => receiving binary
TRBINP: BLOCK 1 ; -1 => transmitting binary
NTOINP: BLOCK 1 ; <0 => output should be suppressed
; I/O buffers. They must be in order PTR, CTR, BFR.
TTIPTR: BLOCK 1 ; TTY input buffer pointer
TTICTR: BLOCK 1 ; TTY input buffer counter
TTIBFR: BLOCK TTIBSZ ; TTY input buffer
TTOPTR: BLOCK 1 ; TTY output buffer pointer
TTOCTR: BLOCK 1 ; TTY output buffer counter
TTOBFR: BLOCK TTOBSZ ; TTY output buffer
NTIPTR: BLOCK 1 ; NET input buffer pointer
NTICTR: BLOCK 1 ; NET input buffer counter
NTIBFR: BLOCK NTIBSZ ; NET input buffer
NTOPTR: BLOCK 1 ; NET output buffer pointer
NTOCTR: BLOCK 1 ; NET output buffer counter
NTOBFR: BLOCK NTOBSZ ; NET output buffer
; JFNs
NETJFN: BLOCK 1 ; network JFN
TMPJFN: BLOCK 1 ; temporary file JFN
; Connection parameters
; Following 2 lines must be in this order
HOST: BLOCK 1 ; host to connect to
PORT: BLOCK 1 ; port ditto
; Other stuff
REPARP: BLOCK 1 ; reparse P
OREPAP: BLOCK 1 ; connection open reparse P
RCVFRH: BLOCK 1 ; receive fork handle
TIMOUT: BLOCK 1 ; <0 means timer is running
FILBUF: BLOCK ^D20 ; buffer for net GTJFN% filename
GTJBLK: BLOCK .GJATR+1 ; GTJFN% block
COREND==.-1 ; last loc zeroed in main loop
; Cells preserved across commands
INICBG==. ; first location cleared at once-only init
EXCFRH: BLOCK 1 ; inferior EXEC's fork handle
LOGJFN: BLOCK 1 ; log file JFN
CMDBUF: BLOCK CMDBSZ ; command buffer
ATMBUF: BLOCK ATMBSZ ; atom buffer
; Preserved flags
PARITP: BLOCK 1 ; -1 => parity enabled
MONCMP: BLOCK 1 ; -1 => saw a monitor command, exit when done
DEBUGP: BLOCK 1 ; -1 => debugging (show protocol negotiations)
OPAQUP: BLOCK 1 ; -1 => use stupid OPAQUE mode
PAGEP: BLOCK 1 ; -1 => use local page mode
TAKEP: BLOCK 1 ; -1 => TAKE file in progress
EXTENP: BLOCK 1 ; -1 => enter extended command mode on ^^
LINEDP: BLOCK 1 ; -1 => use line editor
INICEN==.-1 ; last location cleared at once-only init time
.ENDPS ; back to .LOW. PSECT
SUBTTL Command parser data
; COMND% JSYS block
CMDBLK: REPARS ; reparse address
.PRIIN,,.PRIOU ; using the TTY
0 ; ^R buffer
-1,,CMDBUF ; start of text buffer
-1,,CMDBUF ; next input
CMDBSZ*5 ; size of command buffer
0 ; # of unparsed characters
-1,,ATMBUF ; start of atom buffer
ATMBSZ*5 ; size of atom buffer
GTJBLK ; GTJFN% block
.PSECT CODE,PURBEG ; pure code begins here
; Top-level command parser
CMDCMD: FLDDB. .CMKEY,,CMDTAB,<command,>,,HSTCMD
NETCMD: FLDDB. .CMKEY,,NETTAB,<network name,>,,HSTCMD
HSTCMD: FLDBK. .CMFLD,,,host name,,HNMMSK
; Break mask for slurping up a hostname
HNMMSK: 777777777760 ; no controls
737744001760 ; "#", "-", ".", numerics
400000000260 ; upper case alphabetics, "[", "]"
400000000760 ; lower case alphabetics
; Network parse list
NETTAB: NETTBL,,NETTBL ; number of entries
IFN FTXTND,<
[ASCIZ/CHAOSNET/],,CHSICP
[ASCIZ/DECNET/],,DCNICP
>;IFN FTXTND
[ASCIZ/INTERNET/],,INTICP
IFN FTXTND,<
[ASCIZ/PUP-ETHERNET/],,PUPICP
[ASCIZ/TTY/],,TTYICP
>;IFN FTXTND
NETTBL==<.-NETTAB>-1
; $GTPRO format lookup list
PROTAB:
IFN FTXTND,<
[ASCIZ/Pup/],,PUPIC1
[ASCIZ/Chaos/],,CHSIC1
>;IFN FTXTND
[ASCIZ/TCP/],,INTIC1
IFN FTXTND,<
[ASCIZ/DECnet/],,DCNIC1
>;IFN FTXTND
0 ; terminate for $GTPRO
; Top-level command table
CMDTAB: CMDTBL,,CMDTBL ; TBLUK% table
CMD CONNECT ; connect to a remote host
[CM%FW!CM%INV!CM%ABR
ASCIZ/D/],,.D ; make DDT truly invisible
[CM%FW!CM%INV
ASCIZ/DDT/],,.DDT ; enter DDT
.D:! CMD DEBUG ; enable protocol trace printout
CMD ESCAPE ; set escape character
[CM%FW!CM%INV!CM%ABR
ASCIZ/EX/],,.EX ; make EX mean EXIT
.EX:! CMD EXIT ; return to superior
CMD EXTENDED ; automatic entry to extended command mode
CMD HELP ; print HLP:<name>.HLP
CMD LINE ; enable line editor
CMD LOG ; open typescript file
CMD NETWORK ; various network functions
CMD NO ; use negative options below
CMD OPAQUE ; use local padding, etc.
CMD PAGE ; use local page mode
CMD PUSH ; push to inferior EXEC
CMD QUIT ; quit out of TELNET
CMD STATUS ; where am I
CMD TAKE ; take command file
CMDTBL==<.-CMDTAB>-1 ; number of entries
; Top-level NO command table
CNDTAB: CNDTBL,,CNDTBL ; TBLUK% table
CMD DEBUG ; disable protocol trace printout
CMD EXTENDED ; no automatic entry to extended command mode
CMD LINE ; disable line editor
CMD LOG ; close typescript file
CMD NETWORK ; network control commands
CMD OPAQUE ; don't use local padding, etc.
CMD PAGE ; don't use local page mode
CNDTBL==<.-CNDTAB>-1
; Connection open command table
CMOTAB: CMOTBL,,CMOTBL
CMD ABORT ; abort output signal
CMD ATTN ; interrupt process signal
CMD BREAK ; break signal
CMD CLOSE ; close connection
CMD CONTROL ; send control character
CMD DEBUG ; enable protocol trace printout
CMD ECHO ; remote host echos (yay!)
CMD ESCAPE ; set escape character
CMD EXIT ; return to superior
CMD EXTENDED ; automatic entry to extended command mode
CMD HELP ; print HLP:<name>.HLP
CMD LINE ; enable line editor
CMD LOG ; open typescript file
CMD NO ; use negative options below
CMD OPAQUE ; use local padding, etc.
CMD PAGE ; use local page mode
CMD PUSH ; push to inferior EXEC
CMD QUIT ; quit out of TELNET
CMD STATUS ; are you there signal
CMD TAKE ; take command file
CMD TRANSPARENT ; enable 8-bit I/O
CMOTBL==<.-CMOTAB>-1
; Connection open NO command table
CNOTAB: CNOTBL,,CNOTBL
CMD DEBUG ; disable protocol trace printout
CMD ECHO ; local host echos (boo!)
CMD EXTENDED ; no automatic entry to extended command mode
CMD LINE ; enable line editor
CMD LOG ; close typescript file
CMD OPAQUE ; don't use local padding, etc.
CMD PAGE ; don't use local page mode
CMD TRANSPARENT ; disable 8-bit I/O
CNOTBL==<.-CNOTAB>-1
SUBTTL TELNET protocol codes
TPLTAB: ; IAC xx codes
TPC SE,^D240 ; subnegotiation end
TPC NNOP,^D241 ; no-op
TPC DM,^D242 ; data mark
TPC BRK,^D243 ; break key
TPC IP,^D244 ; interrupt process
TPC AO,^D245 ; abort output
TPC AYT,^D246 ; are you there?
TPC EC,^D247 ; erase character
TPC EL,^D248 ; erase line
TPC GA,^D249 ; go ahead
TPC SB,^D250 ; subnegotiation
TPC WILL,^D251 ; sender will do
TPC WONT,^D252 ; sender won't do
TPC DO,^D253 ; receiver asked to do
TPC DONT,^D254 ; receiver must not do
TPC IAC,^D255 ; interpret as command
TPLMIN==400-<.-TPLTAB>
WDOTAB: ; various WILL/WONT/DO/DONT options
TPC TRNBIN,^D0 ; transmit binary
TPC ECHO,^D1 ; echo
TPC RCP,^D2 ; reconnect
TPC SUPRGA,^D3 ; suppress GA
TPC NAMS,^D4 ; negotiate approx. message size
TPC STATUS,^D5 ; status option
TPC TIMMRK,^D6 ; timing mark
TPC RCTE,^D7 ; remote controlled trans/echo
TPC NAOL,^D8 ; negotiate output line width
TPC NAOP,^D9 ; negotiate page size
TPC NAOCRD,^D10 ; negotiate output CR
TPC NAOHTS,^D11 ; negotiate output horizontal tab stops
TPC NAOHTD,^D12 ; negotiate output HT
TPC NAOFFD,^D13 ; negotiate output FF
TPC NAOVTS,^D14 ; negotiate output vertical tab stops
TPC NAOVTD,^D15 ; negotiate output VT
TPC NAOLFD,^D16 ; negotiate output LF
TPC EXTASC,^D17 ; Tovar's idea of extended ASCII
TPC LOGOUT,^D18 ; logout option
TPC BM,^D19 ; byte macro
TPC DET,^D20 ; data entry terminal option
TPC SUPDUP,^D21 ; SUPDUP (not TELNET) protocol
TPC SDOTPT,^D22 ; SUPDUP output
WDOMAX==.-WDOTAB-1
EXOPL==^D255 ; extended options
SUBTTL Start of program
; Entry vector
IFNDEF VI%DEC,< ; in case MACSYM is prior to release 6
VI%DEC==1B18
>;IFNDEC VI%DEC
EVEC: JRST TELNET ; START address
JRST TELREE ; REENTER address
VI%DEC!<FLD TELWHO,VI%WHO>!<FLD TELVER,VI%MAJ>!<FLD TELMIN,VI%MIN>!<FLD TELEDT,VI%EDN>
EVECL==.-EVEC
; First initialization
TELNET: TDZA A,A ; normal entry
TELREE: SETO A, ; REENTER address
MOVEM A,REENTP ; remember whether START or REENTER
RESET% ; flush all I/O
MOVE P,[IOWD PDLLEN,PDL] ; init stack context
SETZM INICBG ; clear once-only area
MOVE A,[INICBG,,INICBG+1]
BLT A,INICEN
CALL CAPINI ; initialize capabilities
MOVX A,.FHSLF ; set level/channel tables
MOVE B,[LEVTAB,,CHNTAB]
SIR%
ERCAL FATAL
EIR% ; enable PSIs
ERCAL FATAL
MOVX B,<1B<TIMCHN>!1B<.ICIFT>> ; on these channels
AIC%
ERCAL FATAL
CALL SETTIM ; start the timer
MOVX A,.PRIIN ; get current TTY modes
GDSTS% ; check if terminal allows parity
IFNJE.
TXNE B,GD%PAR
SETOM PARITP ; flag we must do parity computation
ENDIF.
RFMOD%
ERCAL FATAL
MOVEM B,TTYMOD
RFCOC% ; get COC words
ERCAL FATAL
DMOVEM B,TTYCOC
MOVX A,.FHJOB ; get terminal interrupt word
RTIW%
ERCAL FATAL
MOVEM B,TTYTIW
MOVX A,DEFESC ; set up escape character
MOVEM A,ESCCHR
; Process RSCAN% buffer and TELNET.CMD
MOVX A,.RSINI ; get RSCAN% buffer if any
RSCAN%
ERCAL FATAL
IFN. A ; RSCAN% buffer seen
DO.
PBIN% ; flush leading whitespace
CAIE A,.CHTAB
CAIN A,.CHSPC
LOOP.
CAIE A,.CHFFD
CAIN A,.CHLFD ; this shouldn't happen, but...
EXIT.
CAIE A,"N" ; allow NTN, etc.
CAIN A,"n"
MOVX A,"T"
CAIE A,"T" ; look like a TELNET command?
CAIN A,"t"
TDZA B,B ; yes, alright to scan for delimiters
SETO B, ; no, just flush command line
DO.
PBIN% ; flush to LF or delimiter
CAIE A,.CHFFD
CAIN A,.CHLFD
EXIT. ; obviously no command
JUMPN B,TOP.
CAIN A,.CHTAB
IFSKP.
CAIE A,.CHSPC
LOOP.
ENDIF.
SETOM MONCMP ; flag a command seen
ENDDO.
ENDDO.
ENDIF.
GJINF% ; get user number
MOVE B,A ; convert to login directory
SETZ A,
RCDIR% ; get login directory number
ERCAL FATAL
HRROI A,FILBUF ; create filename string
MOVE B,C ; using login directory
DIRST%
ERCAL FATAL
HRROI B,[ASCIZ/TELNET.CMD/] ; copy in rest of file name
SETZ C,
SOUT%
MOVX A,GJ%OLD!GJ%SHT ; see if TELNET.CMD exists
HRROI B,FILBUF
GTJFN%
IFNJE.
CALL TAKE1 ; it does, TAKE it
SKIPGE MONCMP ; saw a monitor command?
SOS MONCMP ; yes, fool the AOSN first time in
ENDIF.
SUBTTL Main program
DO. ; here's the top-level loop
MOVE P,[IOWD PDLLEN,PDL] ; re-init stack in case timeout
SETZM CORBEG ; init data area
MOVE A,[CORBEG,,CORBEG+1]
BLT A,COREND
CALL PARSER ; parse and execute command
CLSRET: SKIPE TAKEP ; TAKE in progress?
LOOP. ; yes, continue as if part of same command
SKIPE LOGJFN ; no, log file JFN open?
IFSKP.
SETO A, ; no, flush all JFN's
CLOSF%
ERNOP ; don't die, DECnet CLOSF% can fail...
ENDIF.
TIMRET: AOSN MONCMP ; coming back from a monitor command?
CALL EXIT ; yes, return to EXEC
LOOP.
ENDDO.
SUBTTL Command parser
; Get a command, do it, and return. These are subroutines because errors
; break out by doing RET.
PARSER: MOVEM P,REPARP ; save stack context
MOVEI A,REPARS ; set reparse address
MOVEM A,CMDBLK+.CMFLG
MOVEI A,CMDBLK ; get host name
SKIPGE MONCMP ; if invoked by monitor command, no prompt
SKIPA B,[-1,,[ASCIZ//]] ; monitor command, no prompt
HRROI B,[ASCIZ/TELNET>/] ; otherwise normal prompt
MOVEM B,CMDBLK+.CMRTY
PARSE <.CMINI> ; initialize parse state
JRST ERROR
REPARS: MOVE P,REPARP ; restore stack context
SETZM NOCMDP ; won, flag NO command not in progress
SETZM GTJBLK+.GJEXT ; clear extension default
PARSEA CMDCMD
JRST CMDERR ; command bad
IFQE. CM%FNC,(C) ; (.CMKEY=0) if a command
HRRZ B,(B) ; get address for continued parsing
CALLRET (B) ; and dispatch to it
ENDIF.
HRROI A,ATMBUF ; must parse host name
MOVEI C,PROTAB ; under our supported protocols
CALL $GTPRO
JRST NAMERR ; doesn't match anything
MOVEM B,HOST ; save host address
HRRZ C,(C) ; get address for continued parsing
CALLRET (C) ; now dispatch to it
; Parser when connection open
OPARSE: MOVEM P,OREPAP ; save stack context
MOVEI A,OREPAR ; set reparse address
MOVEM A,CMDBLK+.CMFLG
MOVEI A,CMDBLK ; get command block pointer
HRROI B,[ASCIZ/TELNET!/] ; do prompt
MOVEM B,CMDBLK+.CMRTY
PARSE <.CMINI>
JRST ERROR
OREPAR: MOVE P,OREPAP ; restore stack context
PARSE <.CMCFM,CM%SDH,,RETURN to get back to talk mode,,<[
FLDDB. .CMKEY,,CMOTAB,<command,>]>>
JRST CMDERR
SETZM NOCMDP ; flag no NO command in progress
JN CM%FNC,(C),R ; (.CMKEY=0) just return if confirm
HRRZ B,(B) ; dispatch to it
CALLRET (B)
; Talk mode commands
TLKCMD: SKIPE EXTENP ; enter extended mode immediately?
IFSKP.
DO.
MOVX A,.PRIIN ; get command from terminal
SKIPN ECHOP ; see if possible line editor
SKIPN LINEDP
IFSKP.
SOSGE TTICTR ; looks like line editor - anything there?
ANSKP.
ILDB B,TTIPTR ; snarf byte from buffer and charge in
ELSE.
BIN% ; yes, get following character
ENDIF.
ANDX B,CH%CHR ; ignoring parity
CAMN B,ESCCHR ; send it if doubled escape character
JRST RSKP
CAIE B,"?"
IFSKP.
CALL TTYRST ; normalize TTY in case OPAQUE
TMSG <
Type a single character command:
? This message
A Send ATTN
B Send Break
C Close connection
O Abort output
P Push to inferior EXEC
S Status of TELNET connection
Q Quit
T Transparent mode toggle
X Enter extended command mode
Typing the escape character twice sends it to the host.
Command:>
CALL TTYINI ; reinit TTY
LOOP.
ENDIF.
ENDDO.
CAIL B,"a" ; convert lower case to upper case
CAILE B,"z"
CAIA
SUBI B,"a"-"A"
SKIPN TPROTP ; talking TELNET protocol?
IFSKP.
CAIN B,"A" ; I hope there will never be many of these!
JRST ATTN1
CAIN B,"B"
JRST BREAK1
CAIN B,"O"
JRST ABORT1
ENDIF.
CAIE B,"T"
IFSKP.
MOVE A,TRBINP ; get current state of binary flags
IOR A,RCBINP ; we want OR of state
MOVEM A,NOCMDP ; if either set, NO TRANSPARENT implied
CALLRET TRANS1
ENDIF.
CAIE B,"C"
IFSKP.
CALL TTYRST ; reset terminal mode before message output
CALLRET CLOSE1
ENDIF.
CAIE B,"P"
IFSKP.
CALL TTYRST ; normalize TTY
CALL PUSH1 ; enter inferior EXEC
CALLRET TTYINI ; reinit TTY
ENDIF.
CAIE B,"S"
IFSKP.
CALL TTYRST ; normalize TTY in case OPAQUE
CALL STATU1 ; show status
CALLRET TTYINI ; reinit TTY and return
ENDIF.
CAIE B,"Q"
IFSKP.
CALL TTYRST ; normalize TTY
CALL QUIT1
CALLRET TTYINI ; reinit TTY and return to talk mode
ENDIF.
CAIN B,"X" ; extended command?
ANSKP.
MOVX A,.CHBEL ; feep at bad command
PBOUT%
RET ; invalid command, ignore it
ENDIF.
CALL TTYRST ; put TTY in ordinary mode
DO.
CALL OPARSE ; parse "connection open" commands
SKIPE TAKEP ; out of TAKE file yet?
LOOP. ; not yet
ENDDO.
SKIPN NETJFN ; connection open?
RET ; if not, don't TTYINI again
CALLRET TTYINI ; reinit TTY and return
SUBTTL Command service routines
; ABORT command
.ABORT: SKIPN TPROTP
ERMSG <Not implemented with this protocol>
NOISE <OUTPUT>
CONFIRM
ABORT1: TELCMD <IAC,AO,IAC,DM>
RET
; ATTN command
.ATTN: SKIPN TPROTP
ERMSG <Not implemented with this protocol>
NOISE <KEY>
CONFIRM
ATTN1: TELCMD <IAC,IP,IAC,DM>
RET
; BREAK command
.BREAK: SKIPN TPROTP
ERMSG <Not implemented with this protocol>
NOISE <KEY>
CONFIRM
BREAK1: TELCMD <IAC,BRK,IAC,DM>
RET
; CLOSE command
.CLOSE: NOISE <CONNECTION>
CONFIRM
CLOSE1: MOVX A,.PRIIN ; flush TTY input
CFIBF%
ERCAL FATAL
SETZM TIMOUT ; prevent any timeouts
SKIPE A,RCVFRH ; kill receive fork
KFORK%
ERNOP ; don't die if some hacker zapped our fork
SETZM RCVFRH
SKIPE A,NETJFN ; close network JFN
CLOSF%
ERNOP ; don't die, DECnet can do this
SETZM NETJFN
TMSG <Connection closed>
SKIPN A,LOGJFN ; is a log file open?
IFSKP.
TXO A,CO%NRJ ; yes, close the file without releasing the JFN
CLOSF%
ERCAL FATAL
ELSE.
SKIPE TAKEP ; don't do this if TAKE in progress
IFSKP.
SETO A, ; flush all files
CLOSF%
ERNOP ; don't die, DECnet CLOSF% can fail...
ENDIF.
ENDIF.
RET
; CONTROL command
.CONTR: NOISE <CHARACTER>
PARSE <.CMQST,CM%SDH,,character to send in control form in quotes,<"^">,[
FLDDB. .CMNUM,CM%SDH,^D8,ASCII code for control character in octal]>
JRST ERROR
LOAD C,CM%FNC,(C) ; get function code of parse
CAIE C,.CMNUM ; did user specify a number?
IFSKP.
SKIPL D,B ; barf if number invalid
CAILE B,.CHDEL
ERMSG <Invalid ASCII value>
ELSE.
LDB D,[POINT 7,ATMBUF,6] ; no, try for character
CAIL D,"a" ; see if lower case
CAILE D,"z"
CAIA
SUBI D,"a"-"A" ; yes, convert to upper case
CAIL D,"@" ; is it a meaningful to CTRL this character?
CAILE D,"_"
ERMSG <Character doesn't have a control form>
SUBI D,"@"-.CHNUL ; controllify
ENDIF.
CONFIRM
MOVE B,D ; get character back
CALL NETOUT ; output it
CALLRET NETFRC ; and force the data out
; CONNECT command
.CONNE: NOISE <TO>
PARSEA NETCMD ; get network/host spec
JRST CMDERR
IFQE. CM%FNC,(C) ; (.CMKEY=0) if a command
HRRZ B,(B) ; get address for continued parsing
CALLRET (B) ; and dispatch to it
ENDIF.
HRROI A,ATMBUF ; must parse host name
MOVEI C,PROTAB ; under our supported protocols
CALL $GTPRO
JRST NAMERR ; doesn't match anything
MOVEM B,HOST ; save host address
HRRZ C,(C) ; get address for continued parsing
CALLRET (C) ; now dispatch to it
; DDT command
.DDT: NOISE <MODE>
CONFIRM
MOVE A,[.FHSLF,,DDTADR/1000] ; see if a page of DDT exists
RPACS% ; get page accessability
ERCAL FATAL
TXNN B,PA%PEX ; does page exist?
TDZA A,A ; no
MOVE A,DDTADR ; get DDT start location
CAMN A,[JRST DDTADR+2] ; look like a DDT?
IFSKP.
MOVX A,GJ%OLD!GJ%SHT ; get a JFN on DDT
HRROI B,[ASCIZ/SYS:UDDT.EXE/]
GTJFN%
ERJMP ERROR ; DDT not available
HRLI A,.FHSLF ; load DDT in
GET%
ERCAL FATAL
DMOVE A,.JBSYM ; give DDT our symbol table pointers
DMOVEM A,@DDTADR+1
MOVX A,.FHSLF ; reset entry vector back to us
MOVE B,[EVECL,,EVEC]
SEVEC%
ERCAL FATAL
ENDIF.
TMSG <Type R$G to return to TELNET. You're in >
CALLRET DDTADR
; DEBUG command
.DEBUG: NOISE <PROTOCOL NEGOTIATIONS>
CONFIRM
MOVE A,NOCMDP
SETCAM A,DEBUGP ; flag protocol logging
RET
; ECHO command
.ECHO: NOISE <BY REMOTE HOST>
CONFIRM
SKIPN NOCMDP ; NO ECHO?
IFSKP.
CALL LCLECO ; yes, enter local echo mode
ELSE.
CALL RMTECO ; ECHO command, enable remote echoing
CALL NETFRC ; force out the command
ENDIF.
RET
; ESCAPE command
.ESCAP: NOISE <CHARACTER IS>
PARSE <.CMQST,CM%SDH,,escape character in quotes,<" ">,[
FLDDB. .CMNUM,CM%SDH,^D8,ASCII code for character in octal]>
JRST ERROR
LOAD C,CM%FNC,(C) ; get function code of parse
CAIE C,.CMNUM ; did user specify a number?
LDB B,[POINT 7,ATMBUF,6] ; no, try for character
SKIPL D,B ; barf if number invalid
CAILE B,.CHDEL
ERMSG <Invalid ASCII value>
CONFIRM
MOVEM D,ESCCHR
RET
; EXIT command
.EXIT: NOISE <FROM TELNET>
CONFIRM
SKIPN RCVFRH ; have a connection?
IFSKP.
CALL TTYRST ; reset terminal mode before message output
CALL CLOSE1
ENDIF.
; Continuable exit point from TELNET
EXIT: HALTF% ; return to superior
SETZM MONCMP ; flag no more monitor command since exited
; JRST CAPINI ; (not CALLRET since CAPINI can come back here)
; Initialize capabilities (in case EXEC tries to mess us up)
CAPINI: MOVX A,.FHSLF ; enable all my capabilities
RPCAP%
IOR C,B
IFXE. C,SC%CTC ; better have ^C capability
EMSG <Must have CONTROL-C capability to run TELNET>
JRST EXIT
ENDIF.
EPCAP%
ERCAL FATAL
RET
; EXTENDED command
.EXTEN: NOISE <COMMAND MODE AUTOMATICALLY WHEN ESCAPE CHARACTER TYPED>
CONFIRM
MOVE A,NOCMDP
SETCAM A,EXTENP ; EXTEND mode
RET
; LINE command
.LINE: NOISE <EDITOR FOR LOCAL ECHO CONNECTIONS>
CONFIRM
MOVE A,NOCMDP
SETCAM A,LINEDP ; flag line editor
RET
; HELP command
.HELP: NOISE <IN USING TELNET>
CONFIRM
HRROI A,HLPTXT ; have inline help text so no need for a
PSOUT% ; separate help file
RET
HLPTXT: ASCIZ\
TELNET is a subsystem to allow users to communicate with
other systems via a network. The simplest way to run TELNET is
to enter the host name in response to TELNET's prompt. For
example, typing "SU-SCORE.ARPA" will connect you to Score,
Stanford University Computer Science Department's DECSYSTEM-20,
assuming your system can reach Score via some network.
While talking to the foreign host, you may type commands to
TELNET by typing the ^^ character (CTRL/^, 036 octal) followed by
a single character command character. The most useful command
characters are:
C Close the connection and return to command level
^^ Send a CTRL/^ character to the foreign host.
? List the CTRL/^ command options
This is just the tip of the iceberg. For more information
read the file [SU-SCORE]DOC:TELNET.DOC. Bugs should be reported
to Mark Crispin at Internet address [email protected].
\
; LOG file command
.LOG: SKIPN NOCMDP
IFSKP.
NOISE <FILE>
CONFIRM
SKIPN A,LOGJFN
IFSKP.
TXO A,CO%NRJ
CLOSF%
NOP
MOVE A,LOGJFN
RLJFN%
ERCAL FATAL
SETZM LOGJFN
ENDIF.
ELSE.
NOISE <FILE IS>
PARSE <.CMFIL,CM%SDH,,file to append transcript to,TELNET.LOG>
JRST ERROR
MOVEM B,TMPJFN
CONFIRM
SKIPN A,LOGJFN ; close previous file
IFSKP.
TXO A,CO%NRJ
CLOSF%
NOP
MOVE A,LOGJFN
RLJFN%
ERCAL FATAL
ENDIF.
MOVE A,TMPJFN ; and make new JFN the log file JFN
MOVEM A,LOGJFN
SETZM TMPJFN
SKIPN NETJFN ; connection open?
IFSKP.
MOVX B,<<FLD 7,OF%BSZ>!OF%APP> ; yes, open for append
OPENF%
IFJER.
EMSG <Log file error - >
SETZM LOGJFN
CALL ERROUT ; output last error message
CALLRET CRLF ; output newline and return
ENDIF.
ENDIF.
ENDIF.
RET
; NETWORK command
.NETWO: PARSE <.CMKEY,,NFNTAB,,INTERNET>
JRST ERROR
HRRZ B,(B) ; get address of command server
CALLRET (B) ; and dispatch to it
NFNTAB: NFNTBL,,NFNTBL
IFN FTXTND,<
[ASCIZ/ETHERNET/],,.ETHER
>;IFN FTXTND
[ASCIZ/INTERNET/],,.INTER
NFNTBL==<.-NFNTAB>-1
; NETWORK INTERNET command
.INTER: PARSE <.CMKEY,,IFNTAB,,SERVICE>
JRST ERROR
HRRZ B,(B) ; get address of command server
CALLRET (B) ; and dispatch to it
IFNTAB: IFNTBL,,IFNTBL
[ASCIZ/CYCLE/],,..ICYC
[ASCIZ/INITIALIZE/],,..IINI
[ASCIZ/SERVICE/],,..ISER
IFNTBL==<.-IFNTAB>-1
; NETWORK ETHERNET command
.ETHER: PARSE <.CMKEY,,EFNTAB,,PUP-SERVICE>
JRST ERROR
HRRZ B,(B) ; get address of command server
CALLRET (B) ; dispatch to subcommand server
EFNTAB: EFNTBL,,EFNTBL
[ASCIZ/BUG-LOGGING/],,..EBUG
[ASCIZ/INITIALIZE/],,..EINI
[ASCIZ/PUP-SERVICE/],,..EPUP
EFNTBL==<.-EFNTAB>-1
..IINI: NOISE <HOST TABLE>
CONFIRM
MOVX A,.IPINI ; initialize host table function
IPOPR%
ERJMP ERROR
RET
..ICYC: NOISE <DOWN THEN UP NETWORK>
PARSE <.CMNUM,CM%SDH,^D10,network number,10>
JRST ERROR
MOVE D,B ; save network number
CONFIRM
MOVX A,.IPSNT ; set state function
MOVE B,D ; network number
MOVX C,1 ; request cycling the network
IPOPR%
ERJMP ERROR
RET
..ISER: NOISE <FOR NETWORK>
PARSE <.CMNUM,CM%SDH,^D10,network number,10>
JRST ERROR
MOVE D,B ; save network number
CONFIRM
MOVX A,.IPSNT ; set state function
MOVE B,D ; network number
SETCM C,NOCMDP ; 0 = net off, -1 = net on
IPOPR%
ERJMP ERROR
RET
..EBUG: CONFIRM
MOVX A,.SFBUG ; frob the Pup NCP state
JRST ..ESET
..EINI: NOISE <PUP NETWORK DIRECTORY>
CONFIRM
MOVX A,.SFDIR ; initialize Pup directory
JRST ..ESET
..EPUP: NOISE <UP>
CONFIRM
MOVX A,.SFPUP ; frob the Pup NCP state
..ESET: SETCM B,NOCMDP ; using complement of NO state
SMON%
ERJMP ERROR
RET
; NO set of commands
.NO: SKIPE RCVFRH ; have a connection?
IFSKP.
PARSE <.CMKEY,,CNDTAB,<command,>>
JRST CMDERR
ELSE.
PARSE <.CMKEY,,CNOTAB,<command,>>
JRST CMDERR
ENDIF.
SETOM NOCMDP
HRRZ B,(B)
CALLRET (B)
; OPAQUE and PAGE commands
.OPAQU: SKIPA D,[SETOM OPAQUP]
.PAGE: MOVE D,[SETOM PAGEP]
NOISE <MODE>
CONFIRM
SKIPE NOCMDP ; NO [OPAQUE | PAGE] command?
XORX D,<<SETOM>^!<SETZM>> ; yes, change SETOM to SETZM
XCT D
RET
; PUSH command
.PUSH: NOISE <COMMAND LEVEL>
CONFIRM
PUSH1: STKVAR <EXCJFN>
SETO A, ; get subsystem/program names into T/TT
MOVE B,[-2,,T]
MOVX C,.JISNM ; note .JIPNM = .JISNM + 1
GETJI%
ERCAL FATAL
MOVX A,.FHSLF ; disable PSIs
DIR%
ERCAL FATAL
SKIPN A,EXCFRH ; have an EXEC already?
IFSKP.
MOVE A,EXCFRH ; yes, continue the extant fork
TXO A,SF%CON
SFORK%
ERNOP ; fork vanished or something
ELSE.
MOVX A,GJ%OLD!GJ%SHT ; try to get an EXEC
HRROI B,[ASCIZ/SYSTEM:EXEC.EXE/]
GTJFN%
ERJMP ERROR
MOVEM A,EXCJFN ; save EXEC's JFN
MOVX A,CR%CAP ; make an inferior fork
CFORK%
IFJER.
MOVE A,EXCJFN ; get JFN back
RLJFN% ; flush it
NOP
JRST ERROR ; report it
ENDIF.
MOVEM A,EXCFRH ; remember this EXEC's fork handle
MOVE A,EXCJFN ; save fork handle, get JFN
HRL A,EXCFRH ; stuff the fork
GET%
ERCAL FATAL
MOVX A,.FHSLF ; get my current capabilities
RPCAP%
MOVE A,EXCFRH ; get back fork handle of inferior
TXZ B,SC%LOG ; don't let inferior log out
SETZ C, ; and don't enable any capabilities
EPCAP%
ERCAL FATAL
SETZ B, ; run it and wait for it to stop
SFRKV%
ERCAL FATAL
ENDIF.
WFORK%
ERCAL FATAL
MOVX A,.FHSLF ; re-enable PSIs
EIR%
ERCAL FATAL
DMOVE A,T ; restore old names
SETSN%
ERCAL FATAL
RET
; QUIT command
.QUIT: NOISE <OUT OF TELNET>
CONFIRM
QUIT1: SKIPN A,RCVFRH ; if connection is not open
JRST EXIT ; this is easy
FFORK% ; freeze net input fork so it doesn't die
ERCAL FATAL ; if you enter DDT or something
CALL EXIT ; return to EXEC
MOVE A,RCVFRH ; resume net input fork
RFORK%
ERCAL FATAL
RET
; STATUS command
STABSZ==^D20 ; size of status buffer
.STATU: NOISE <OF TELNET CONNECTION>
CONFIRM
STATU1: STKVAR <<STABUF,STABSZ>>
HRROI A,STABUF ; get our local name
CALL $GTLCL
IFSKP.
HRROI A,STABUF ; output it if success (shouldn't fail)
PSOUT%
ENDIF.
TMSG < TELNET >
MOVX A,.PRIOU ; set up for primary output
LOAD B,VI%MAJ,EVEC+2 ; get major version
TMNN VI%DEC,EVEC+2 ; decimal versions?
SKIPA C,[^D8] ; no, octal for typeout
MOVX C,^D10 ; yes, output in decimal
NOUT%
ERCAL FATAL
LOAD B,VI%MIN,EVEC+2 ; get minor version
IFN. B ; ignore if no minor version
MOVEI A,"." ; output delimiting dot
PBOUT%
MOVX A,.PRIOU ; now output the minor version
NOUT%
ERCAL FATAL
ENDIF.
LOAD B,<VI%EDN&^-VI%DEC>,EVEC+2 ; get edit version
IFN. B ; ignore if no edit version
MOVEI A,"(" ; edit delimiter
PBOUT%
MOVX A,.PRIOU ; now output the edit version
NOUT%
ERCAL FATAL
MOVEI A,")" ; edit close delimiter
PBOUT%
ENDIF.
LOAD B,VI%WHO,EVEC+2 ; get who last edited
IFN. B ; ignore if last edited at DEC
MOVEI A,"-" ; output delimiting hyphen
PBOUT%
MOVX A,.PRIOU ; now output the who version
NOUT%
ERCAL FATAL
ENDIF.
TMSG <
This is >
HRROI A,.SYSVER ; length of SYSVER table
GETAB%
ERCAL FATAL
HRLZ B,A ; get up AOBJN pointer for name
ADDI A,STABSZ ; make sure there's enough space!
SKIPGE A ; a-okay
MOVSI B,-STABSZ ; otherwise use buffer size as a maximum
MOVEI C,STABUF ; resolve address
DO.
MOVX A,.SYSVER ; table number
HRLI A,(B) ; index into table
GETAB%
ERCAL FATAL
MOVEM A,(C) ; store in buffer
ADDI C,1 ; index to next word
AOBJN B,TOP. ; get next word
ENDDO.
HRROI A,STABUF
PSOUT%
CALL CRLF ; newline
SKIPN NETJFN ; connection open?
RET ; no, all done
TMSG <Connected to >
SKIPN TTYP ; TTY port?
IFSKP.
TMSG <TTY>
MOVX A,.PRIOU ; output TTY number
MOVE B,HOST
MOVX C,^D8
NOUT%
NOP
ELSE.
TMSG <host >
HRROI A,STABUF ; get host string
MOVE B,HOST ; from host number
SKIPN DCNP ; DECnet?
IFSKP.
CALL $DECNS ; translate number to string
NOP ; can't fail
HRROI B,[ASCIZ/, object type /]
SETZ C,
SOUT%
MOVE B,PORT ; output the object type
MOVX C,^D10 ; in decimal
NOUT%
ERCAL FATAL
ENDIF.
SKIPN CHAOSP ; Chaosnet?
IFSKP.
CALL $CHSNS ; translate number to string
NOP ; can't fail
HRROI B,[ASCIZ/, contact name /]
SETZ C,
SOUT%
MOVE B,NETJFN ; get contact name from JFN
MOVX C,<FLD .JSAOF,JS%TYP>
JFNS%
ERCAL FATAL
ENDIF.
SKIPN INTP ; Internet?
IFSKP.
CALL $GTHNS ; translate number to string
NOP ; can't fail
HRROI B,[ASCIZ/, port /]
SETZ C,
SOUT%
LDB B,[POINT 8,PORT,27] ; high port byte
MOVX C,^D10 ; in decimal
NOUT%
ERCAL FATAL
MOVX B,"." ; dotted delimiter
IDPB B,A
LDB B,[POINT 8,PORT,35] ; low port byte
MOVX C,^D10 ; in decimal
NOUT%
ERCAL FATAL
ENDIF.
SKIPN PUPP ; Pup Ethernet?
IFSKP.
CALL $PUPNS ; translate number to string
NOP ; can't fail
HRROI B,[ASCIZ/, socket /]
SETZ C,
SOUT%
PUSH P,A ; save string over this
HRROI A,ATMBUF ; get socket name from JFN
MOVE B,NETJFN
MOVX C,<FLD .JSAOF,JS%TYP>
JFNS%
ERCAL FATAL
POP P,A ; restore destination string pointer
MOVE B,[POINT 7,ATMBUF] ; now search for "+"
DO.
ILDB C,B ; get byte from string
CAIE C,"+" ; saw the "+" yet?
LOOP.
ENDDO.
SETZ C, ; now copy remainder of string
SOUT%
ENDIF.
HRROI A,STABUF ; output the string
PSOUT%
ENDIF.
REPORT ECHOP,<Local host is echoing>,<Remote host is echoing>
REPORT LINEDP,<Line editor disabled>,<Line editor enabled>
REPORT RCBINP,<Host is not sending binary>,<Host is sending binary>
REPORT TRBINP,<Transparent mode disabled>,<Transparent mode enabled>
REPORT OPAQUP,<Opaque mode disabled>,<Opaque mode enabled>
REPORT PAGEP,<Page mode disabled>,<Page mode enabled>
REPORT LOGJFN,<No log file>,<Log file open>
REPORT TAKEP,<No TAKE file>,<TAKE file in progress>
REPORT EXTENP,<Simple talk command mode>,<Extended talk command mode>
SKIPN TPROTP ; don't do this if not TELNET protocol
JRST CRLF
TMSG <
Using Internet TELNET protocol>
REPORT SUPGAP,<Host wants GA's>,<GA's are suppressed>
TMSG <
Remote host status reply:
>
TELCMD <IAC,AYT>
RET
ENDSV.
; TAKE command
.TAKE: SKIPE TAKEP ; TAKE in progress?
ERMSG <TAKE command in progress>
NOISE <COMMANDS FROM FILE>
HRROI [ASCIZ/CMD/] ; default extension is .CMD
MOVEM GTJBLK+.GJEXT
PARSE <.CMFIL> ; now get input file
JRST ERROR
MOVEM B,TMPJFN ; save JFN over CONFIRM
SETZM GTJBLK+.GJEXT ; clear default extension
CONFIRM
MOVE A,TMPJFN ; now open the file
TAKE1: MOVX B,<<FLD 7,OF%BSZ>!OF%RD>
OPENF%
ERJMP ERROR
SETZM TMPJFN
HRLM A,CMDBLK+.CMIOJ ; input JFN in left half
MOVX A,.NULIO ; no output
HRRM A,CMDBLK+.CMIOJ ; set as new I/O JFNs
SETOM TAKEP ; flag TAKE in progress
RET
UNTAKE: SETZM TAKEP ; flag no more TAKE file
HLRZ A,CMDBLK+.CMIOJ ; get TAKE file JFN back
CLOSF% ; close it
ERCAL FATAL ; yeegs
MOVE A,[.PRIIN,,.PRIOU] ; restore command input from primaries
MOVEM A,CMDBLK+.CMIOJ
RET
; TRANSPARENT command
.TRANS: NOISE <MODE>
CONFIRM
TRANS1: MOVE A,NOCMDP
SETCAM A,TRBINP ; set binary states accordingly
SETCAM A,RCBINP
; Strictly speaking, this violates TELNET protocol because it can send a
; protocol option when the connection is already in the desired state. The
; code is simpler and easier to read this way, though, and it provides a way
; for the user to set the state at the host if it's set the wrong way there.
SKIPN TPROTP ; no need to do protocol if not a protocol net
IFSKP.
SKIPE TRBINP
IFSKP.
TELCMD <IAC,WONT,TRNBIN>
ELSE.
TELCMD <IAC,WILL,TRNBIN>
ENDIF.
SKIPE RCBINP
IFSKP.
TELCMD <IAC,DONT,TRNBIN>
ELSE.
TELCMD <IAC,DO,TRNBIN>
ENDIF.
ENDIF.
RET
SUBTTL Internet ICP setup routine
INTICP: NOISE <HOST> ; prompt for host
PARSEA [FLDBK. .CMFLD,,,Internet host name,,HNMMSK]
JRST CMDERR
HRROI A,ATMBUF ; got host name, now parse it
CALL $GTHSN ; get its address
JRST NAMERR
MOVEM B,HOST ; save host address
INTIC1: MOVEI A,CMDBLK ; restore CSB
NOISE <ON PORT>
PARSE <.CMKEY,,IPRTAB,<port name,>,TELNET,[FLDDB. .CMNUM,CM%SDH,^D10,decimal port number]>
JRST ERROR
LOAD C,CM%FNC,(C) ; get function code of parse
CAIE C,.CMKEY ; if keyword
IFSKP.
HRRZ B,(B) ; get port datum
MOVEM B,PORT ; save port number
ELSE.
SKIPL B ; validate port number
CAILE B,377
ERMSG <Invalid port number>
MOVEM B,PORT ; save high order byte in a safe place
PARSE <.CMTOK,CM%SDH,<-1,,[ASCIZ/./]>,<"." to delimit high and low bytes of port number>>
ANSKP.
SKIPE PORT ; if first byte zero, default second to 23
IFSKP.
PARSE <.CMNUM,CM%SDH,^D10,low order byte of port number,23>
JRST ERROR
ELSE.
PARSE <.CMNUM,CM%SDH,^D10,low order byte of port number>
JRST ERROR
ENDIF.
SKIPL B ; validate port number
CAILE B,377
ERMSG <Invalid port number>
EXCH B,PORT ; swap first and second inputs
LSH B,^D8 ; shift first input to high order byte
IORM B,PORT ; merge and store port
ENDIF.
DMOVE A,[POINT 7,FILBUF+1
ASCII/TCP:./]
MOVEM B,FILBUF
MOVE B,HOST ; destination host number
MOVX C,^D8 ; in octal
NOUT% ; output to file string
ERCAL FATAL
MOVX B,"-" ; port delimiter (do it this way in case some
IDPB B,A ; cretin ever tries to use port 0)
MOVE B,PORT ; get port
CAIN B,TPRPRT ; TELNET protocol port?
SETOM TPROTP ; make sure we know TELNET protocol
MOVX C,^D10 ; ports are decimal
NOUT% ; output to file string
ERCAL FATAL
HRROI B,[ASCIZ/;CONNECTION:ACTIVE;PERSIST:30/] ; quit after 30 seconds
SETZ C,
SOUT%
MOVEI A,CMDBLK ; restore CSB
CONFIRM
SETOM INTP
MOVX C,<FLD .TCMWH,OF%MOD> ; buffered mode, wait for connection
CALLRET ICP ; now go do ICP
; Table of well-known Internet ports
IPRTAB: IPRTBL,,IPRTBL
[ASCIZ/CSNET-MAILBOX/],,^D103
[ASCIZ/DAYTIME/],,^D13
[ASCIZ/DISCARD/],,^D9
[ASCIZ/ECHO/],,^D7
[ASCIZ/FINGER/],,^D79
[ASCIZ/FTP/],,^D21
[ASCIZ/HOSTS2-NAME/],,^D81
[ASCIZ/METAGRAM/],,^D99
[ASCIZ/NAME/],,^D42
[ASCIZ/NETSTAT/],,^D15
[ASCIZ/NIC-NAME/],,^D101
[ASCIZ/OLD-FTP/],,^D3
[ASCIZ/OLD-TELNET/],,^D1
[ASCIZ/SMTP/],,^D25
[ASCIZ/SYSTAT/],,^D11
[ASCIZ/TELNET/],,TPRPRT ; TELNET (our default)
[ASCIZ/TEXT/],,^D17
[ASCIZ/TN-TUNNEL/],,^D89
[ASCIZ/TTYTST/],,^D19
[ASCIZ/WHOIS/],,^D43
IPRTBL==<.-IPRTAB>-1
SUBTTL Chaosnet ICP setup routine
CHSICP: NOISE <HOST> ; prompt for host
PARSEA [FLDBK. .CMFLD,,,Chaosnet host name,,HNMMSK]
JRST CMDERR
HRROI A,ATMBUF ; got host name, now parse it
CALL $CHSSN
JRST NAMERR
MOVEM B,HOST ; save host address
CHSIC1: MOVEI A,CMDBLK ; restore CSB
NOISE <AT CONTACT NAME>
PARSE <.CMFLD,CM%SDH,,contact name,TELNET>
JRST ERROR
DMOVE A,[POINT 7,FILBUF,27
ASCII/CHA:/] ; build CHA: filename
MOVEM B,FILBUF
MOVE B,HOST ; first put in host number
MOVX C,^D8
NOUT%
ERCAL FATAL
MOVX B,"."
IDPB B,A
MOVE B,[POINT 7,ATMBUF] ; add contact name to string
DO.
ILDB C,B ; string copy including null
IDPB C,A ; save in filename string
JUMPN C,TOP.
ENDDO.
MOVEI A,CMDBLK ; restore CSB
CONFIRM
SETOM ECHOP ; normal state is remote echo
SETOM CHAOSP ; flag Chaosnet connection
SETZ C,
CALLRET ICP
SUBTTL DECnet ICP setup routine
DCNICP: NOISE <HOST> ; prompt for host
PARSEA [FLDBK. .CMFLD,,,DECnet host name,,HNMMSK]
JRST CMDERR
HRROI A,ATMBUF ; got host name, now parse it
CALL $DECSN ; get its address
JRST NAMERR
MOVEM B,HOST ; save host address
DCNIC1: MOVEI A,CMDBLK ; restore CSB
NOISE <AT OBJECT TYPE>
PARSE <.CMNUM,CM%SDH,^D10,decimal object type number,23>
JRST ERROR
SKIPL B ; validate object type
CAILE B,377
ERMSG <Invalid object type>
MOVEM B,PORT
DMOVE A,[POINT 7,FILBUF,27 ; build DCN: filename
ASCII/DCN:/]
MOVEM B,FILBUF
MOVE B,HOST ; now insert host name
DO.
SETZ C, ; clear out crud from before
ROTC B,6 ; get a byte of the name
IFN. C ; if non-null
ADDI C,"A"-'A' ; convert from SIXBIT to ASCII
IDPB C,A ; insert in string
LOOP. ; and continue
ENDIF.
ENDDO.
MOVN B,PORT ; delimited by a hyphen
MOVX C,^D10
NOUT%
ERCAL FATAL
MOVEI A,CMDBLK
CONFIRM
SETOM ECHOP ; always echo on DECnet
SETOM RCBINP ; remote side does parity stuff
SETOM DCNP ; flag DECnet connection
SETZ C,
CALLRET ICP
SUBTTL Pup Ethernet ICP setup routine
PUPICP: NOISE <HOST> ; prompt for host
PARSEA [FLDBK. .CMFLD,,,Ethernet host name,,HNMMSK]
JRST CMDERR
HRROI A,ATMBUF ; got host name, now parse it
CALL $PUPSN ; get its address
JRST NAMERR
MOVEM B,HOST ; save host address
PUPIC1: MOVEI A,CMDBLK ; restore CSB
NOISE <SOCKET>
PARSE <.CMFLD,CM%SDH,,socket name or number,Telnet>
JRST ERROR
DMOVE A,[ASCII/PUP:0!J./] ; job-relative socket
DMOVEM A,FILBUF
MOVE A,[POINT 7,FILBUF+1,27]
HLRZ B,HOST ; output network number
MOVX C,^D8
NOUT%
ERCAL FATAL
MOVX B,.CHCNV
IDPB B,A
MOVX B,"#" ; network/host delimiter
IDPB B,A
HRRZ B,HOST ; output host number
NOUT%
ERCAL FATAL
SETZ C, ; null-terminated strings
HRROI B,[ASCIZ/#+/] ; host/socket delimiter
SOUT%
HRROI B,ATMBUF ; now socket
SOUT%
MOVEI A,CMDBLK ; restore CSB
CONFIRM
SETOM ECHOP ; always remote echo with Pup TELNET
SETOM PUPP ; flag Pup Ethernet connection
MOVX C,<<^D8>B17> ; 30 second timeout
CALLRET ICP
SUBTTL TTY ICP setup routine
TTYICP: NOISE <LINE NUMBER> ; prompt for host
PARSE <.CMNUM,CM%SDH,^D8,octal TTY number>
JRST CMDERR
MOVEM B,HOST ; set as "host number"
DMOVE A,[POINT 7,FILBUF,20
ASCII/TTY/] ; build TTY: filename
MOVEM B,FILBUF
MOVE B,HOST ; TTY number
MOVX C,^D8
NOUT%
ERCAL FATAL
MOVX B,":"
IDPB B,A
SETZ B,
IDPB B,A
MOVEI A,CMDBLK
CONFIRM
SETOM ECHOP ; always echo on TTYs
SETOM RCBINP ; remote side does parity stuff
SETOM TRBINP ; pass on binary from keyboard
SETOM TTYP
SETZ C,
CALLRET ICP
SUBTTL ICP completion routine
; Do ICP, called with OPENF% mode bits in C
ICP: TMSG < Trying... >
MOVX A,GJ%SHT ; short form, restricted
HRROI B,FILBUF ; pointer to file string we made
GTJFN% ; make a JFN on it
ERJMP ERROUT ; failed?
MOVEM A,NETJFN ; save JFN
MOVX B,<<FLD ^D8,OF%BSZ>!OF%RD!OF%WR> ; 8 bit read/write
IOR B,C ; with network-dependent other bits
OPENF% ; open it
IFJER.
CAIE A,OPNX7 ; some other job has the TTY line?
IFSKP.
TMSG <In use by job >
MOVE A,NETJFN ; get back JFN
DVCHR% ; find out who has it
ERCAL FATAL
HLRE B,C ; get job number in B
MOVX A,.PRIOU ; output the job number in decimal
MOVX C,^D10
NOUT%
ERCAL FATAL
RET
ENDIF.
CAIE A,OPNX10 ; better than "Entire file structure full"
IFSKP.
TMSG <Insufficient system resources>
RET
ENDIF.
CAIE A,OPNX19 ; better than "IMP is not up"
IFSKP.
TMSG <Network service is down>
RET
ENDIF.
CALL ERROUT ; otherwise use last error's string
CAIN A,OPNX21 ; refused?
SKIPN PUPP ; yes, is it Pup?
IFSKP.
MOVE A,NETJFN ; yes, get abort data
MOVX B,.MOPRA
HRROI D,FILBUF ; get its string into FILBUF
MTOPR%
..TAGF (ERJMP,) ; I sure wish ANNJE. existed!
TMSG <: >
HRROI A,FILBUF ; it won, output the code
PSOUT%
ENDIF.
SKIPN INTP ; Internet?
RET ; no, all done
MOVX A,.GTHHN ; find out what's going down with this host
MOVE C,HOST
GTHST%
ERJMP R ; ignore error
JXE D,HS%VAL,R ; valid host status?
JXN D,HS%UP,R ; yes, did we get an 1822 host dead message?
LOAD A,HS%RSN,D ; get host down reason code
HRRO A,[[ASCIZ/, network trouble/]
[ASCIZ/, system down/]
[ASCIZ/, foreign TCP down/]
[ASCIZ/, doesn't exist/]
[ASCIZ/, foreign IMP initialization/]
[ASCIZ/, scheduled PM/]
[ASCIZ/, hardware work/]
[ASCIZ/, software work/]
[ASCIZ/, emergency restart/]
[ASCIZ/, power failure/]
[ASCIZ/, software breakpoint/]
[ASCIZ/, hardware error/]
[ASCIZ/, scheduled down/]
[ASCIZ/, down code #13/]
[ASCIZ/, down code #14/]
[ASCIZ/, coming up now/]](A)
PSOUT%
LOAD A,HS%DAY!HS%HR!HS%MIN,D ; get expected up time
JUMPE A,R ; 0 means unknown
CAIE A,7777 ; -1 means a long while
IFSKP.
TMSG <, up over a week from now>
RET
ENDIF.
CAIN A,7776 ; -2 means unspecified
RET
STKVAR <SAVTIM>
MOVEM D,SAVTIM
SETO B, ; time now
SETZ D, ; use local time zone, etc.
ODCNV% ; get time zone flags in D
EXCH D,SAVTIM ; get back time, put flags on stack
LOAD B,HS%HR,D ; hours
LOAD C,HS%MIN,D ; 5-minute interval
CAIGE B,^D24 ; ensure in bounds
CAIL C,^D12
RET ; no, forget it
IMULI C,5 ; minutes in C
MOVE T,SAVTIM
LOAD D,HS%DAY,D ; day of week
LOAD A,IC%TMZ,T ; get timezone
TXNE A,40 ; if east of the line (unlikely)
IOR A,[-1,,777700] ; extend the sign bit
SUB B,A ; now account for timezone in hours
TXNE T,IC%ADS ; if daylight losing time
ADDI B,1 ; we go an hour east
IFL. B ; same day?
ADDI B,^D24 ; no, make hours positive
SOSGE D ; and day the previous day
MOVX D,6 ; underflow, back into Sunday
ENDIF.
HRRO A,[[ASCIZ/, up on Monday at /]
[ASCIZ/, up on Tuesday at /]
[ASCIZ/, up on Wednesday at /]
[ASCIZ/, up on Thursday at /]
[ASCIZ/, up on Friday at /]
[ASCIZ/, up on Saturday at /]
[ASCIZ/, up on Sunday at /]
[ASCIZ/, up on April Fool's Day at /]](D) ; shouldn't happen
PSOUT%
CAIGE B,^D11 ; afternoon?
TDZA D,D ; no, AM
MOVX D,1 ; yes, set PM flag
SKIPN B ; midnight?
MOVX B,^D12 ; yes, convert hour to 12
IFE. C ; if minutes non-zero, not noon or midnight
CAIN B,^D12 ; noon or midnight?
ADDI D,2 ; yes, set noon/midnight flag
ENDIF.
MOVEM C,SAVTIM ; save minutes
MOVX A,.PRIOU
CAILE B,^D12 ; afternoon?
SUBI B,^D12 ; yes, fix for 12 hour clock
MOVX C,^D10
NOUT%
ERCAL FATAL
MOVX B,":"
BOUT%
MOVE B,SAVTIM
TXO C,<NO%LFL!NO%ZRO!<FLD 2,NO%COL>> ; leading filler, zeros
NOUT%
ERCAL FATAL
HRRO A,[[ASCIZ/ AM /]
[ASCIZ/ PM /]
[ASCIZ/ midnight /]
[ASCIZ/ noon /]](D)
PSOUT%
LOAD A,IC%TMZ,T ; get timezone
IFE. A
TXNE T,IC%ADS ; Greenwich Daylight time(!)?
SKIPA A,[-1,,[ASCIZ/GDT/]]
HRROI A,[ASCIZ/GMT/]
PSOUT%
ELSE.
CAIG A,^D11 ; USA or Canada timezone?
CAIGE A,^D4
RET
MOVE B,[ASCII/AST/ ; Atlantic
ASCII/EST/ ; Eastern
ASCII/CST/ ; Central
ASCII/MST/ ; Mountain
ASCII/PST/ ; Pacific
ASCII/YST/ ; Yukon
ASCII/HST/ ; Alaska-Hawaii
ASCII/BST/]-4(A) ; Bering
TXNE T,IC%ADS ; if daylight losing time
XORX B,<<ASCII/ S/>^!<ASCII/ D/>>
HRROI A,B
PSOUT%
ENDIF.
RET
ENDIF.
SKIPN DCNP ; special post-OPENF% actions for DECnet
IFSKP.
MOVE B,[POINT 8,NTIBFR] ; read status message
MOVNI C,200 ; known size of status message
SINR%
ERJMP DCNERR
LDB A,[POINT 8,NTIBFR,7] ; check first byte, should be a 1
CAIN A,1 ; is it?
IFSKP.
MOVE B,[POINT 8,NTIBFR] ; doesn't look like a status message
ADDI C,200 ; set up as text then
DMOVEM B,NTIPTR
ELSE.
LDB A,[POINT 8,NTIBFR+1,23] ; get host type
CAIE A,^D9 ; TOPS-10?
CAIN A,^D8 ; TOPS-20?
ANSKP.
TMSG <Can't connect to non-TOPS-10/20 host>
RET
ENDIF.
ENDIF.
SKIPN TTYP ; special post-OPENF% actions for TTY
IFSKP.
MOVX B,.CHCRT ; send a CR down the line to get things going
BOUT%
ERCAL FATAL
RFMOD% ; get current mode for this line
ERCAL FATAL
TXZ B,<TT%ECO!TT%DAM!TT%PGM> ; no echo, binary mode, no paging
SFMOD%
ERCAL FATAL
STPAR%
ERCAL FATAL
ENDIF.
TMSG <Open
>
CALL TTYINI ; init TTY modes for talk mode
SKIPN A,LOGJFN ; log file?
IFSKP.
MOVX B,<<FLD 7,OF%BSZ>!OF%APP> ; yes, open for append
OPENF%
IFJER.
EMSG <Log file error - >
SETZM LOGJFN ; flag no more log file
CALL ERROUT ; output last error message
CALLRET CRLF ; output newline and return
ENDIF.
ENDIF.
DMOVE A,[POINT 8,NTOBFR
4*NTOBSZ]
DMOVEM A,NTOPTR ; init NET output buffer pointer/counter
DMOVE A,[POINT 8,TTOBFR
4*TTOBSZ]
DMOVEM A,TTOPTR ; init TTY output buffer pointer/counter
SKIPN TPROTP ; send initial commands if TELNET protocol
IFSKP.
SETOM SUPGAP ; will always suppress GA's
TELCM1 <IAC,DO,SUPRGA>
SKIPN LINEDP ; is line editor enabled?
CALL RMTECO ; no, want remote echo
ENDIF.
MOVX A,<CR%MAP!CR%CAP!CR%ST!RCVFRK>
CFORK% ; create receive fork
ERCAL FATAL
MOVEM A,RCVFRH ; save the handle
CALL NETFRC ; force initial negotiations now
SUBTTL Keyboard input loop
DO.
SKIPN RCVFRH ; possibly a command closed the connection
RET ; quit if receive fork went away
SOSGE TTICTR ; any characters left in the buffer?
IFSKP.
ILDB B,TTIPTR ; yes, read a byte
CAIE B,.CHCRT ; did we just get a CR?
IFSKP.
SOSGE TTICTR ; yes, there is probably an LF to eat!
ANSKP.
ILDB A,TTIPTR ; get the LF
CAIN A,.CHLFD ; well??
ANSKP.
AOS TTICTR ; this shouldn't happen, but do the right thing
SETO A,
ADJBP A,TTIPTR
MOVEM A,TTIPTR
ENDIF.
ELSE.
SKIPN ECHOP ; local echoing?
SKIPN LINEDP ; yes, using line editor?
IFSKP.
DMOVE A,[POINT 7,TTIBFR ; set up pointer to TTY input buffer
RD%BEL!<5*TTIBSZ>] ; return on EOL, # of characters
MOVEM A,TTIPTR
SETZ C, ; no ^R buffer
RDTTY% ; get the line
ERCAL FATAL
MOVX A,5*TTIBSZ ; compute number of characters read
SUBI A,(B)
MOVEM A,TTICTR ; set up counter
LOOP.
ELSE.
MOVX A,.PRIIN ; no line editor, get a byte from user
BIN%
ENDIF.
ENDIF.
LOAD C,CH%CHR,B ; get a copy of the character without parity
SKIPE OPAQUP ; opaque mode?
CAIE C,.CHCRT ; yes, character a CR?
IFSKP.
PBIN% ; yes, eat the LF
ANDX A,CH%CHR ; ignore parity
CAIN A,.CHLFD ; saw LF?
ANSKP.
MOVX A,.PRIIN ; shouldn't happen, but...
BKJFN%
ERCAL FATAL
ENDIF.
CAME C,ESCCHR ; intercept character?
IFSKP.
CALL TLKCMD ; yes, process command
LOOP. ; no command to do
ENDIF.
DO.
SKIPN TRBINP ; toss out parity if not binary
TXZ B,CH%PAR
SKIPE ECHOP ; see if have to echo
IFSKP.
MOVX A,.PRIOU ; echo the byte
SKIPN LINEDP ; if line editor, already did it to terminal
BOUT%
SKIPE A,LOGJFN ; and put it in the log file too
BOUT%
ENDIF.
CALL NETOUT ; output it
SKIPN TPROTP ; new protocol?
IFSKP.
CAIN B,IAC ; yes, double it if an IAC
CALL NETOUT
ENDIF.
SKIPN INTP ; Internet?
SKIPE CHAOSP ; no, Chaosnet?
IFNSK.
SKIPN TRBINP ; yes, in binary mode?
CAIE B,.CHCRT ; no, saw a CR?
ANSKP.
MOVX B,.CHLFD ; yes, must follow with LF, fake entered
LOOP. ; from terminal
ENDIF.
ENDDO.
MOVX A,.PRIIN ; any more bytes in TTI buffer?
SKIPG TTICTR ; or any line editor stuff?
SIBE%
LOOP. ; yes, get them before doing network output
CALL NETFRC ; otherwise force the buffer out
LOOP.
ENDDO.
SUBTTL Interrupt stuff
; PSI blocks
LEVTAB: LEV1PC ; priority level table
LEV2PC
LEV3PC
CHNTAB: PHASE 0 ; channel table
INSCHN:!2,,INSINT ; INS channel
TIMCHN:!1,,TIMINT ; timer channel
REPEAT .ICIFT-.,<0>
.ICIFT:!1,,CLSINT ; receive fork termination channel
REPEAT ^D36-.,<0>
DEPHASE
; Interrupt from sender interrupt
INSINT: MOVEM 17,IN2ACS+17 ; save all ACs
MOVEI 17,IN2ACS
BLT 17,IN2ACS+16
MOVE 17,IN2ACS+17
SOSL NTOINP ; count up another INS
IFSKP.
MOVX A,.PRIOU
CFOBF% ; flush output buffer
DMOVE A,[POINT 8,TTOBFR
4*TTOBSZ]
DMOVEM A,TTOPTR ; init buffer pointer/counter
HRRZ A,LEV2PC ; get PC of interrupt
CAIL A,TTOPC ; are we doing our moby TTY SOUT%?
CAILE A,TTOPC+1
ANSKP.
MOVX A,<PC%USR!TTOPC+1> ; yes, dismiss to after the SOUT%
MOVEM A,LEV2PC
ENDIF.
SKIPN DEBUGP
IFSKP.
TMSG <*R*INS*
>
ENDIF.
MOVSI 17,IN2ACS ; restore ACs
BLT 17,17
DEBRK%
; Connection closed interrupt
CLSINT: MOVEM 17,IN1ACS+17 ; save all ACs
MOVEI 17,IN1ACS
BLT 17,IN1ACS+16
MOVE 17,IN1ACS+17
SKIPN A,RCVFRH ; is there a receive fork?
IFSKP.
RFSTS%
ERCAL FATAL
LOAD A,RF%STS,A ; get fork status code
CAIE A,.RFFPT ; did somebody zap me?
IFSKP.
CALL TTYRST ; no, restore TTY to normal mode
EMSG <Abnormal fork termination interrupt
>
CALL CLOSE1 ; flush JFNs, etc.
MOVX A,PC%USR!CLSRET ; dismiss back to top level
MOVEM A,LEV1PC
ELSE.
CAIE A,.RFHLT ; stopped voluntarily?
ANSKP. ; if not then some other fork caused the int
CALL TTYRST ; restore TTY to normal mode for message
SKIPE DCNP ; give DECnet diagnostic if appropriate
CALL DCNERR
CALL CLOSE1
TMSG < by foreign host>
MOVX A,PC%USR!CLSRET ; dismiss back to top level
MOVEM A,LEV1PC
ENDIF.
ENDIF.
MOVSI 17,IN1ACS ; restore ACs
BLT 17,17
DEBRK%
; Initialize the timer
SETTIM: MOVE A,[.FHSLF,,.TIMEL] ; tick the timer every 5 seconds
MOVX B,^D5*^D1000
MOVX C,TIMCHN
TIMER%
ERCAL FATAL
RET
; Timer interrupt
TIMINT: MOVEM 17,IN1ACS+17 ; save all ACs
MOVEI 17,IN1ACS
BLT 17,IN1ACS+16
MOVE 17,IN1ACS+17
CALL SETTIM ; reinitialize the timer
AOSE TIMOUT ; has timer run out yet?
IFSKP.
CALL TTYRST ; yes, reset TTY status, forcibly
EMSG <Time out>
MOVX A,.PRIIN ; flush TTY input
CFIBF%
ERCAL FATAL
SKIPE A,RCVFRH ; kill receive fork
KFORK%
ERNOP ; don't die if some hacker zapped our fork
MOVX A,<PC%USR!TIMRET> ; dismiss back to top level
MOVEM A,LEV1PC
ENDIF.
MOVSI 17,IN1ACS ; restore ACs
BLT 17,17
DEBRK%
SUBTTL Network input fork
RCVFRK: MOVE P,[IOWD PDLLEN,RPDL] ; set up fork's stack
MOVX A,.FHSLF
MOVE B,[LEVTAB,,CHNTAB] ; init inferior's PSI's (sigh...)
SIR%
ERCAL FATAL
EIR%
ERCAL FATAL
MOVX B,<1B<INSCHN>>
AIC%
ERCAL FATAL
SKIPN INTP ; Internet?
IFSKP.
MOVE A,NETJFN ; set up INS PSI for Urgent data
MOVX B,.TCSPC
MOVX C,<<FLD INSCHN,TC%TPU>!TC%TER!TC%TSC!TC%TXX>
TCOPR%
ERNOP
ENDIF.
SKIPN PUPP ; Pup Ethernet?
IFSKP.
MOVE A,NETJFN ; set up INS PSI
MOVX B,.MOAIN
HRLOI C,007777 ; Interrupt on channel 0, no other PSI's
MTOPR%
ERNOP ; connection may have closed very quickly
ENDIF.
; Network input fork main loop
DO.
SOSL NTICTR ; anything in net input buffer?
IFSKP.
MOVE A,NETJFN ; no, any input in the system for me?
SIBE%
IFSKP.
CALL TTOSND ; no, force out TTY buffer
MOVE A,NETJFN ; and read in exactly one byte
MOVX B,1
ENDIF.
CAILE B,4*NTIBSZ ; bounds check
MOVX B,4*NTIBSZ ; guess we should reassemble!
MOVEM B,NTICTR ; note number of words this buffer
MOVNI C,(B)
MOVE B,[POINT 8,NTIBFR]
MOVEM B,NTIPTR ; re-initialize pointer
SIN% ; slurp up the net data
IFJER.
SKIPN PUPP ; Pup Ethernet connection?
JRST DEATH ; no, assume the connection has died
SETZ C, ; not interested in port status cruft
GDSTS% ; find out what happened
ERCAL FATAL
JXN B,BS.END,DEATH ; End encountered?
TXZN B,BS.MRK ; Mark encountered?
LOOP. ; no, must be randomness then
SDSTS% ; clear Mark condition
ERCAL FATAL
MOVX B,.MOPRM ; get the Mark byte that did us in
MTOPR%
ERCAL FATAL
CAIN C,MK.DAT ; Data Mark?
AOSA NTOINP
CAIE C,MK.TIM ; Timing Mark?
LOOP. ; get out of this cruft now
MOVE A,NETJFN ; need output JFN to send data mark
MOVX B,.MOPEF ; send Mark
MOVX C,MK.TMR ; Timing Mark Reply
MTOPR%
ERCAL FATAL
ENDIF.
LOOP.
ENDIF.
ILDB B,NTIPTR ; read a single byte
SKIPN TPROTP ; using TELNET protocol?
IFSKP.
AOSN NETCMP ; yes, IAC in progress?
IFSKP.
CAIE B,IAC ; no, network command?
IFSKP.
SETOM NETCMP ; yes, remember that one is coming
LOOP.
ENDIF.
ELSE.
CAIN B,IAC ; IAC in progress, quoted IAC?
ANSKP.
SKIPN DEBUGP ; no, log the message if debugging
IFSKP.
TMSG <*R*IAC>
CAIL B,TPLMIN ; known option?
IFSKP.
MOVX A,.CHSPC ; no, output it numerically
PBOUT%
MOVX A,.PRIOU
MOVX C,^D8
NOUT%
ERCAL FATAL
ELSE.
HRRO A,TPLTAB-TPLMIN(B)
PSOUT% ; output option name
ENDIF.
CAIL B,WILL ; three byte command?
ANSKP.
TMSG <*
>
ENDIF.
CAIN B,DM ; Data Mark?
AOS NTOINP
CAIN B,WILL ; WILL option?
SETOM WILLP
CAIN B,WONT ; WONT
SETOM WONTP
CAIN B,DO ; DO
SETOM DOP
CAIN B,DONT ; DONT
SETOM DONTP
CAIE B,SB ; subnegotiations are losers!
IFSKP.
TMSG <
******************************
* Foreign host sent a subnegotiation. Either there was a
* transmission error in the network or there is a bug in
* somebody's network code. Please report that this happened.
* You will probably see some garbage after this message.
******************************
>
ENDIF.
LOOP.
ENDIF.
AOSE WILLP ; WILL in progress?
IFSKP.
CALL OPTLST
CAIE B,SUPRGA ; WILL SUPPRESS-GA? (yay!)
IFSKP.
SKIPE SUPGAP
LOOP.
SETOM SUPGAP
TELCMD <IAC,DO,SUPRGA>
LOOP.
ENDIF.
CAIE B,ECHO ; WILL ECHO?
IFSKP.
CALL RMTECO
CALL NETFRC ; force out the command
LOOP.
ENDIF.
CAIE B,TRNBIN ; WILL TRANSMIT-BINARY?
IFSKP.
SKIPE RCBINP
LOOP.
SETOM RCBINP
TELCMD <IAC,DO,TRNBIN>
LOOP.
ENDIF.
PUSH P,B
MOVX B,IAC
CALL NETOUT
MOVX B,DONT
CALL NETOUT
POP P,B
CALL NETOUT
SKIPN DEBUGP
IFSKP.
TMSG <*S*IAC,DONT>
CALL OPTLST
ENDIF.
CALL NETFRC
LOOP.
ENDIF.
AOSE WONTP ; WONT in progress?
IFSKP.
CALL OPTLST
CAIE B,ECHO ; WONT ECHO?
IFSKP.
CALL LCLECO ; yes, enter that mode
LOOP.
ENDIF.
CAIE B,TRNBIN ; WON'T TRANSMIT-BINARY?
IFSKP.
SKIPN RCBINP ; yes, already in that mode?
LOOP.
SETZM RCBINP ; yes, change modes and confirm it
TELCMD <IAC,DONT,TRNBIN>
LOOP.
ENDIF.
CAIN B,SUPRGA ; WONT SUPPRESS-GA?
SKIPL SUPGAP
LOOP.
TELCMD <IAC,DONT,SUPRGA> ; confirm it, but we'll never send any
SETZM SUPGAP ; GA's anyway
LOOP.
ENDIF.
AOSE DOP ; DO in progress?
IFSKP.
CALL OPTLST
CAIE B,TRNBIN ; DO TRANSMIT-BINARY?
IFSKP.
SKIPE TRBINP
LOOP.
SETOM TRBINP
TELCMD <IAC,WILL,TRNBIN>
LOOP.
ENDIF.
CAIE B,TIMMRK ; is it this cretinous timing-mark option?
IFSKP.
TELCMD <IAC,WILL,TIMMRK>
LOOP.
ENDIF.
PUSH P,B ; unsupported DO option, refuse it
MOVX B,IAC
CALL NETOUT
MOVX B,WONT
CALL NETOUT
POP P,B
CALL NETOUT
SKIPN DEBUGP
IFSKP.
TMSG <*S*IAC,WONT>
CALL OPTLST
ENDIF.
CALL NETFRC
LOOP.
ENDIF.
AOSE DONTP ; DONT in progress?
IFSKP.
CALL OPTLST
CAIN B,TRNBIN ; DONT TRANSMIT-BINARY?
SKIPN TRBINP
LOOP.
TELCMD <IAC,WONT,TRNBIN> ; yes, confirm it
SETZM TRBINP
LOOP.
ENDIF.
ELSE.
SKIPN INTP ; not TELNET protocol, but enter it if see an
SKIPE CHAOSP ; escape on Internet or Chaosnet
ANNSK.
CAIE B,IAC ; saw a protocol escape?
ANSKP.
SETOM TPROTP ; yes, note that we entered TELNET protocol
SETOM NETCMP ; flag IAC in progress
CALL RMTECO ; try for remote echoing (don't NETFRC)
SETOM SUPGAP ; and GA suppression
TELCM1 <IAC,DO,SUPRGA>
LOOP. ; get next (command) byte
ENDIF.
SKIPGE NTOINP ; flush if output abort in progress
LOOP.
SKIPN PARITP ; are we required to do parity?
TXZA B,CH%PAR ; no, clear parity bit
SKIPE RCBINP ; yes, remote host sending binary?
IFSKP.
MOVEI A,(B) ; no, must comput parity
LSH A,-4 ; get high order 4 bits of character
XORI A,(B) ; fold into 4 bits
TXCE A,14 ; left two bits both 0 or 1?
TXNN A,14
XORX B,CH%PAR ; yes, set parity
TXCE A,3 ; right two bits both 0 or 1?
TXNN A,3
TXCA B,CH%PAR ; set parity
TXZ B,CH%PAR ; parity must be clear
ENDIF.
IDPB B,TTOPTR ; else stick it in buffer
SOSG TTOCTR ; buffer full now?
CALL TTOSND ; force it out then
LOOP.
ENDDO.
; Output an option code in B
OPTLST: SKIPN DEBUGP
RET
CAIE B,EXOPL ; this option is way out in the boonies
IFSKP.
TMSG < EXOPL*>
RET
ENDIF.
CAIG B,WDOMAX ; new option I don't know yet?
IFSKP.
MOVX A,.CHSPC
PBOUT%
MOVX A,.PRIOU
MOVX C,^D8
NOUT%
ERCAL FATAL
RET
ENDIF.
HRRO A,WDOTAB(B) ; otherwise print the option name
PSOUT%
TMSG <*
>
RET
SUBTTL Network I/O subroutines
; Add a single byte to the network output buffer
NETOUT: IDPB B,NTOPTR ; stuff byte in buffer
SOSLE NTOCTR ; any space left in buffer?
RET ; yes, just return
; CALLRET NETFRC ; no, force buffer out
; Force the accumulated buffer out to the network
NETFRC: DMOVE B,[POINT 8,NTOBFR ; get pointer/counter to net output buffer
4*NTOBSZ]
CAMN C,NTOCTR ; no-op if buffer empty
RET
MOVX A,TIMTCK ; set a timeout over this code
MOVNM A,TIMOUT
MOVEM B,NTOPTR ; reset pointer
EXCH C,NTOCTR ; reset counter, get old counter
SUB C,NTOCTR ; C := negative count of bytes in buffer
MOVE A,NETJFN ; force network buffer out
MOVE B,NTOPTR ; from start of buffer
SOUTR% ; send it now
ERJMP R ; don't ITRAP on this guy
SETZM TIMOUT ; clear timeout
RET ; return
; Output a string to the network, pointer to string in 9-bit bytes in B
NETSTR: STKVAR <NETPTR>
HRLI B,(<POINT 9,>) ; make 9-bit bytes
MOVEM B,NETPTR ; save pointer
DO.
ILDB B,NETPTR ; get a byte
CAIN B,777 ; end of string byte?
IFSKP.
CALL NETOUT ; output it
LOOP. ; loop until finished
ENDIF.
ENDDO.
RET
SUBTTL TTY I/O subroutines
; Force out accumulated TTY buffer (called when full or net input buffer empty)
TTOSND: DMOVE B,[POINT 8,TTOBFR
4*TTOBSZ]
CAMN C,TTOCTR ; no-op if buffer empty
RET
MOVEM B,TTOPTR ; re-init buffer pointer/counter
EXCH C,TTOCTR
SUB C,TTOCTR ; C := negative count of bytes in buffer
PUSH P,C ; save the counter in case log file
SKIPE A,LOGJFN ; is there a log file?
SOUT% ; yes, output the text to the file
MOVX A,.PRIOU ; buffer full, output it
MOVE B,[POINT 8,TTOBFR]
POP P,C
TTOPC: SOUT% ; output the buffer
RET
; Outputs a CRLF iff it is necessary
CRLF: SAVEAC <A,B>
MOVX A,.PRIOU
RFPOS% ; get cursor position
JXE B,.RHALF,R ; is it necessary?
TMSG <
>
RET
; Initialize TTY state for talk mode
TTYINI: SKIPGE TTYINP ; are we already TTYINI'd?
RET ; yes, ignore
SETOM TTYINP ; flag terminal TTYINI'd
MOVX A,.FHJOB ; disable all TTY interrupts
SETZ B,
STIW%
ERCAL FATAL
MOVX A,.PRIIN
MOVE B,TTYMOD ; get nominal TTY mode
SKIPN OPAQUP ; opaque mode?
TXZ B,TT%DAM ; yes, enter binary mode
SKIPN LINEDP ; using line editor?
TXZ B,TT%ECO ; no, disable echo as well
SFMOD%
ERCAL FATAL
SKIPE PAGEP ; PAGE mode enabled?
TXOA B,TT%PGM ; enable page mode
TXZ B,TT%PGM ; disable page mode
STPAR%
ERCAL FATAL
SKIPN OPAQUP ; opaque mode?
RET ; no, no need to do CCOC hackery
DMOVE B,[BYTE (2) 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2
BYTE (2) 2,2,2,2,2,2,2,2,2,2,2,2,2,2]
SFCOC% ; diddle CCOC words
ERCAL FATAL
RET
; Reset TTY state when leaving talk to remote host mode
TTYRST: SKIPL TTYINP ; are we TTYINI'd?
RET ; no, ignore
SETZM TTYINP ; no longer TTYINI'd
TMSG <
> ; output (unconditional) newline
MOVX A,.FHJOB
MOVE B,TTYTIW ; restore old TTY interrupt word
STIW%
ERCAL FATAL
MOVX A,.PRIIN ; restore old TTY state
MOVE B,TTYMOD
SFMOD%
ERCAL FATAL
STPAR%
ERCAL FATAL
SKIPN OPAQUP ; opaque mode?
RET ; no, no need to do CCOC hackery
DMOVE B,TTYCOC ; restore CCOC words
SFCOC%
ERCAL FATAL
RET
; Enter remote echo, note that TELCM1 is used so caller must NETFRC
RMTECO: SKIPE ECHOP ; already in the state?
RET ; yes, no-op
SETOM ECHOP ; flag remote echo
SKIPN LINEDP ; using line editor?
IFSKP.
MOVX A,.PRIIN ; get current TTY modes
RFMOD%
ERCAL FATAL
TXZ B,TT%ECO ; disable echoing
SFMOD%
ERCAL FATAL
ENDIF.
SKIPN TPROTP ; doing protocol?
IFSKP.
TELCM1 <IAC,DO,ECHO>
ENDIF.
RET ; return to caller
; Enter local echo
LCLECO: SKIPN ECHOP ; were we already in local echo mode?
RET ; yes, no-op this routine
SETZM ECHOP ; flag local echo
MOVX A,.PRIIN ; get current TTY modes
RFMOD%
ERCAL FATAL
SKIPN LINEDP ; using line editor?
TXZA B,TT%ECO ; no, disable echo as well
TXO B,TT%ECO ; yes, enable echoing
SFMOD%
ERCAL FATAL
SKIPN TPROTP ; doing protocol?
IFSKP.
TELCMD <IAC,DONT,ECHO>
ENDIF.
RET ; return to caller
SUBTTL Error handling stuff
; DECnet connection failed. Report why
DCNERR: MOVE A,NETJFN ; set up JFN in case called from CLSINT
MOVX B,.MORLS ; get link status
MTOPR%
ERJMP ERROR ; JFN screwed up or something
HRRZ B,C
CAIGE B,MXDNER ; reasonable error code?
SKIPN A,DCNETB(B) ; yes, get message
IFSKP.
PSOUT% ; win, output message text
ELSE.
TMSG <NSP error #> ; no message or off the wall error code
MOVX A,.PRIOU ; sigh, output number
MOVX C,^D10 ; in decimal
NOUT%
ERCAL FATAL
ENDIF.
MOVE A,NETJFN
MOVX B,.MORDA ; read optional data
HRROI C,TTOBFR ; into TTOBFR
SETZ D,
MTOPR%
ERNOP
IFN. D ; done if no host name
SETZ D, ; tie off string with a null
IDPB D,C
TMSG < at host >
HRROI A,TTOBFR ; print the losing host
PSOUT%
ENDIF.
CALLRET CRLF
; Table of NSP error codes and their messages
DCNETB: PHASE 0
.DCX0::!-1,,[ASCIZ/No special error/]
.DCX1::!-1,,[ASCIZ/Resource allocation failure/]
.DCX2::!-1,,[ASCIZ/Destination node does not exist/]
.DCX3::!-1,,[ASCIZ/Node shutting down/]
.DCX4::!-1,,[ASCIZ/Destination NRT process does not exist/]
.DCX5::!-1,,[ASCIZ/Invalid name field/]
.DCX6::!0
.DCX7::!0
.DCX8::!0
.DCX9::!-1,,[ASCIZ/NRT server aborted link/]
.DCX10::!0
.DCX11::!-1,,[ASCIZ/Undefined error/]
.DCX12::!0
.DCX13::!0
.DCX14::!0
.DCX15::!0
.DCX16::!0
.DCX17::!0
.DCX18::!0
.DCX19::!0
.DCX20::!0
.DCX21::!-1,,[ASCIZ/CI with invalid destination address/]
.DCX22::!0
.DCX23::!0
.DCX24::!-1,,[ASCIZ/Flow control violation/]
.DCX25::!0
.DCX26::!0
.DCX27::!0
.DCX28::!0
.DCX29::!0
.DCX30::!0
.DCX31::!0
.DCX32::!-1,,[ASCIZ/Too many connections to node/]
.DCX33::!-1,,[ASCIZ/Too many connections to destination NRT process/]
.DCX34::!-1,,[ASCIZ/Access not permitted/]
.DCX35::!-1,,[ASCIZ/Logical link services mismatch/]
.DCX36::!-1,,[ASCIZ/Invalid account/]
.DCX37::!-1,,[ASCIZ/Segment size too small/]
.DCX38::!-1,,[ASCIZ/Process aborted/]
.DCX39::!-1,,[ASCIZ/No path to destination node/]
.DCX40::!-1,,[ASCIZ/Link aborted due to data loss/]
.DCX41::!-1,,[ASCIZ/Destination logical link address does not exist/]
.DCX42::!-1,,[ASCIZ/Confirmation of disconnect initiate/]
.DCX43::!-1,,[ASCIZ/Image data field too long/]
DEPHASE
MXDNER==.-DCNETB
NAMERR: EMSG <No such host name>
CALLRET CMDER1
CMDERR: EMSG <>
CALL ERROUT ; output last error message
CMDER1: TMSG < - ">
HRROI A,ATMBUF ; output last atom
PSOUT%
TMSG <"
>
SKIPE A,TMPJFN ; flush possible JFN
RLJFN%
NOP ; don't loop in error output
SETZM TMPJFN
RET
; Other non-fatal JSYS error
ERROR: SKIPN TAKEP ; TAKE file in progress?
IFSKP.
MOVX A,.FHSLF ; yes, check last error
GETER%
HRRZS B ; only want error code
CAIN B,IOX4 ; end of TAKE file?
JRST UNTAKE ; leave TAKE file and return to user
ENDIF.
EMSG <>
CALL ERROUT ; output last error message
SKIPE A,TMPJFN ; flush possible JFN
RLJFN%
NOP ; don't loop in error output
SETZM TMPJFN
CALLRET CRLF ; output newline and return
; Common routine called to output last error code's message
ERROUT: SAVEAC <A> ; save error code if here
MOVX A,.PRIOU
HRLOI B,.FHSLF ; dumb ERSTR%
SETZ C,
ERSTR%
NOP ; ERSTR% has TWO failure returns...ugh!
TRNA
RET
TMSG <Undefined error >
MOVX A,.FHSLF ; get error number
GETER%
MOVX A,.PRIOU ; output it
HRRZS B ; only right half where error code is
MOVX C,^D8 ; in octal
NOUT%
ERJMP R ; ignore error here
RET
; Fatal errors arrive here
FATAL: MOVEM 17,FATACS+17 ; save all ACs
MOVEI 17,FATACS
BLT 17,FATACS+16
MOVE 17,FATACS+17
EMSG <>
CALL ERROUT
TMSG <, >
MOVE TT,(P) ; get PC
MOVE TT,-2(TT) ; get instruction which lost
CALL SYMOUT
TMSG < at PC >
POP P,TT
MOVEI TT,-2(TT) ; point PC at actual location of the JSYS
CALL SYMOUT
CALL CRLF
DEATH: DO.
HALTF% ; non-continuable TELNET exit point
EMSG <Can't continue>
LOOP.
ENDDO.
; Clever symbol table lookup routine. For details, read "Introduction to
; DECSYSTEM-20 Assembly Language Programming", by Ralph Gorin, published by
; Digital Press, 1981. Called with desired symbol in F.
SYMOUT: SETZB C,T ; no current program name or best symbol
MOVE D,.JBSYM ; symbol table pointer
HLRO A,D
SUB D,A ; -count,,ending address +1
DO.
LDB A,[POINT 4,-2(D),3] ; symbol type
IFN. A ; program names are uninteresting
CAILE A,2 ; 0=prog name, 1=global, 2=local
ANSKP.
MOVE A,-1(D) ; value of the symbol
CAME A,TT ; exact match?
IFSKP.
MOVE T,D ; yes, select it
EXIT.
ENDIF.
CAML A,TT ; smaller than value sought?
ANSKP.
SKIPE B,T ; get best one so far if there is one
CAML A,-1(B) ; compare to previous best
MOVE T,D ; current symbol is best match so far
ENDIF.
ADD D,[2000000-2] ; add 2 in the left, sub 2 in the right
JUMPL D,TOP. ; loop unless control count is exhausted
ENDDO.
IFN. T ; did we have anything that could help?
MOVE B,TT ; yes, get desired value
SUB B,-1(T) ; less symbol's value = offset
CAIL B,200 ; is offset small enough?
ANSKP.
MOVE A,-2(T) ; symbol name
TXZ A,<MASKB 0,3> ; clear flags
CALL SQZTYO ; print symbol name
SUB TT,-1(T) ; value we wanted less this symbol's value
JUMPE TT,R ; if no offset, don't print "+0"
MOVX A,"+" ; add + to the output line
PBOUT%
ENDIF.
MOVX A,.PRIOU ; and copy numeric offset to output
MOVE B,TT ; getting the offset first...
MOVX C,^D8
NOUT%
NOP
RET
; Convert a 32-bit quantity in A from squoze to ASCII
SQZTYO: IDIVI A,50 ; divide by 50
PUSH P,B ; save remainder, a character
SKIPE A ; if A is now zero, unwind the stack
CALL SQZTYO ; call self again, reduce A
POP P,A ; get character
ADJBP A,[POINT 7,[ASCII/ 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ.$%/],6]
LDB A,A ; convert squoze code to ASCII
PBOUT%
RET
SUBTTL Other randomness
; Constants
...VAR:!VAR ; generate variables (there shouldn't be any)
IFN .-...VAR,<.FATAL Variables can't be in this program>
...LIT: XLIST ; save trees during LIT
LIT ; generate literals
LIST
END EVECL,,EVEC ; The End