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    Names: »thdlc«

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TextFile

prefix prepdma;
procedure prepdma(fh,fl:integer; var msg,dev:reference);
const
setmsel=14*256;
setflh =13*256;
setfll =12*256;
setcnth=11*256;
setcntl=10*256;
setadrh= 9*256;
setadrl= 8*256;
cntsetpnt=20*256;

type inftype=record
top,cnt:integer;
b1: base_type;
b2,b3:byte;
end;

wrd=record h,l:byte end;

procedure getbufparam(var inf:inftype; first,last:integer; var m:reference);
external;
procedure control(w:integer; var dev:reference); external;
procedure asgn=asgnintset(var w:wrd; w1:integer); external;

var inf:inftype;  w: wrd;

begin
lock msg as m:record
first,last,next:integer;
end do begin
getbufparam(inf,m.first,m.last,msg);
control(setmsel+inf.b1.mem_no,dev);
control(setflh+fh,dev);
asgn(w,-inf.cnt);
control(setcnth+w.h,dev);
control(setcntl+w.l,dev);
control(setadrh+inf.b2,dev);
control(setadrl+inf.b3,dev);
control(setfll+fl,dev);
control(cntsetpnt,dev);
end;
end;
\f


process hdlc(var sem:semaphore; reclev:integer);
const
recsize=256;
xmtsize=256;
testmax=30;

type
commandfield=packed record nr:0..7; p:0..1; ns:0..7; i:0..1 end;
framehead   =packed record a: 0..255;  c: commandfield  end;
headbuf     =record first,last,next: integer; fh: framehead end;
headbuf1    =record first,last,next: integer; op: framehead end;
cmdrinf     =packed record cmd,cnt: commandfield; cause: 0..255 end;
pntbuf      =record first,last,next: integer end;
minbuf      =record first,last,next: integer; inf: cmdrinf end;
errortype   = 0..63;
pnttype     =packed record notused:0..8191; p: 0..7 end;
hxtype      =packed record h0,h1,h2,h3: 0..15 end;
dblint      =record h,l: integer end;

modemtype   =packed record f:byte; notused:0..3;
rts,dtr,ci,rate,txe,rxe: 0..1
end;

status      =packed record
         sqd,ffo,ffoi,xmtu,cts,dsr,dcd,ci: boolean;
         error: errortype;
         eom,size: boolean;
       end;

statistics=record
na1,na2,na3: integer;
reci,xmti,skip,retr: dblint;
recrnr,xmtrnr,recrej,xmtrej,timeout,
dsroff,dcdoff,sqdoff,cion: integer;
cmdrin: cmdrinf;
overrun,underrun,recabort,time,rate: integer
end;

testtype=record
first,last,next: integer;
d:array (0..testmax) of packed record
nt,tt:integer;
at:0..255;
ct:commandfield;
stt:status;
(* extended testoutput ****************
*)
b: 0..4;
r,x: 0..15;
y: 0..2;
jt: 0..7;

vt,tnt: 0..7;
t0t: 0..63;
m,snd,sif,ab: boolean;
p0,p1,p2,p3,p4,p5,p6,p7: 0..15;
(**************************************)
end;
end;

flag        =packed array (0..15) of boolean;
rates=array(1..11) of integer;

const
i0   =commandfield(0,0,0,0);
rr   =commandfield(0,0,0,1);
rnr  =commandfield(0,0,2,1);
rej  =commandfield(0,0,4,1);
ua   =commandfield(3,0,1,1);
dm   =commandfield(0,0,7,1);
sabmp=commandfield(1,1,7,1);
cmdr =commandfield(4,0,3,1);
discp=commandfield(2,1,1,1);

rrframe  =0;
rnrframe =2;
rejframe =4;
iframe   =8;

discframe=2;
sabmframe=1;
uaframe  =3;
cmdrframe=4;
dmframe  =0;
sarmframe=0;

<* address *> dce=1;  dte=3;


causew=1;
causex=3;
causey=4;
causez=8;

message         =7;
timeransw       =1;
recansw         =2;
xmtansw         =3;
conansw         =4;

inputmess       =1;
outputmess      =2;
sensemess       =0;
connectmess     =4;
disconnectmess  =8;
returnallmess   =12;
returnunusedmess=16;
modemmess       =24;
statmess        =28;
statclrmess     =32;
linespeedmess   =36;
eventmess       =40;
testmess        =44;

setflh=13*256;
setfll=12*256;
startrec=16*256+14;
startxmt=17*256+2;
abort=22*256;

getadr=0*256;
getcnt=24*256;
cntsetpnt=20*256;
cntgetpnt=21*256;

<* modemcontrol *>
connectline=modemtype(19,0,0,0,0,0,1,0);

<* xstate *>
xi         =0;
xis        =1;
xua        =2;
xuap       =3;
xspresponse=4;
xspcommand =5;
xdm        =6;
xdmp       =7;
xsabmp     =8;
xcmdr      =9;
xdiscp     =10;

noerror=0;
abst=1;
f=false;
st0=status(f,f,f,f,f,f,f,f,noerror,f,f);
db0=dblint(0,0);
stc0=statistics(0,0,0,db0,db0,db0,db0,
0,0,0,0,0,0,0,0,0,cmdrinf(i0,i0,0),0,0,0,0,0);

maxrate=16000;
byterate=rates(14,38,75,150,300,600,1200,2400,6000,8000,maxrate);

var
preack,send,sendingiframe,aborting: boolean:=false;
scommode,pollmode,
polling,frameok,validinf,ack,poll,auto,nofinalalarm: boolean;
sendok,test,mstate: boolean:=true;
rstate: integer:=10;
bstate,xstate,ystate,t,tn,time,vi,vs:integer:=0;
vr:integer:=-1;
modem: modemtype:=modemtype(19,0,1,1,0,0,0,0);
me:integer:=dce;
you:integer:=dte;
recerr,xmterr: integer:=0;
eventlost: integer:=-1;
bmode,ymode,xmtlev,k,n2,t1,t2,i,j,l,ovs,ovr,cns,aux:integer;
cnt: integer;
st1,st: status:=status(f,f,f,f,true,true,f,f,noerror,f,f);
stc: statistics:=stc0;
testbit: flag:=flag(16***true);
ml,m,mx,b1,b2,mw,mw1,mc,cmdrbuf,recdev,xmtdev: reference;
op: framehead;
testbuf: testtype;
recshadow,xmtshadow: shadow;
eventqueue,rec,xmt,ique,asem,qs1,testsem,s: semaphore;
headpool: pool 5;
framepool: pool 4 of headbuf;
cmdrpool: pool 1 of minbuf;
priq1: array (-1..8) of semaphore;
priq: array (-1..8) of ^semaphore;
qs,qw: ^semaphore;
cmdrout: cmdrinf;
p: pnttype;
hx: hxtype;

function copychm(var r1,r2: reference): integer; external;
procedure control(w:integer; var dev:reference); external;
procedure controlclr(w:integer; var dev:reference); external;
procedure prepdma(fh,fl:integer; var m,dev: reference); external;
procedure asgnbit=asgnintset(var bit:flag; w:integer); external;
procedure sensefl=sense(var f:flag; w:integer; var dev:reference);
  external;
procedure sensest=sense(var s:status; w:integer; var dev:reference);
  external;
procedure         sense(var c:integer; w:integer; var dev:reference);
  external;
procedure sensept=sense(var p:pnttype; w:integer; var dev:reference);
external;
procedure sensehx=sense(var p:hxtype; w:integer; var dev:reference);
external;
procedure setmodem=control(w:modemtype; var dev:reference); external;
procedure setinterrupt(var ch: reference); external;
function uadd(a,b: integer): integer; external;

function setlength(var m:reference): boolean;
var i: integer;
begin
i:=m^.u2; setlength:=false;
for l:=1 to i do begin
pop(mw,m);
while mw^.size=0 do begin
push(mw,mw1); pop(mw,m);
end;
lock mw as d: pntbuf do with d do
if l=j then begin
next:=last+cnt+1; if l=1 then setlength:=next>first else setlength:=true;
end else if l<j then next:=last+1 else next:=first;
push(mw,mw1);
end;
while not nil(mw1) do begin
pop(mw,mw1); push(mw,m);
end;
end;

procedure setdata(var m:reference);
var fh,fl,i:integer;
begin
i:=0; fl:=4;
repeat
pop(mw,m);
i:=i+1; fh:=4;
while mw^.size=0 do begin
push(mw,mw1); pop(mw,m);
end;
if not nil(m) then if m^.size>0 then fh:=0;
prepdma(fh,fl,mw,recdev);
push(mw,mw1);
fl:=14;
until fh>0;
while not nil(mw1) do begin
pop(mw,mw1); push(mw,m);
end;
m^.u2:=i;
end;

procedure readframe;
begin
control(startrec,recdev);
prepdma(4,2,m,recdev);
end;

procedure retransmit;
begin
while open(priq(8)^) do begin
wait(mw,priq(8)^); signal(mw,qs^);
end;
qw:=priq(8); priq(8):=qs; qs:=qw;
end;

procedure rejaction;
begin
if vi>0 then begin
vs:=op.c.nr; vi:=0;
if sendingiframe then begin
control(abort,xmtdev); aborting:=true;
end else if open(qs^) then retransmit;
end;
end;

procedure resetaction;
begin ovs:=(vs-vi+8) mod 8; ovr:=vr;
rejaction; vs:=0; vr:=-1; ystate:=0; mstate:=true;
end;

procedure copytest(var m:reference);
begin
lock m as b:testtype do begin
b:=testbuf;
with testbuf do begin next:=first; last:=first end;
with b do if last<testmax then last:=next-1
else if next>testmax then next:=first;
end;
end;

procedure otest(n:integer; a:0..255; c:commandfield);
begin
with testbuf do if next>testmax then
if open(testsem) then begin
wait(mw,testsem); copytest(mw); return(mw);
end else begin last:=testmax; next:=first end;
with testbuf.d(testbuf.next) do begin
nt:=n; at:=a; ct:=c; stt:=st; tt:=time;
(* extended testoutput ************************************************
*)
b:=bstate; r:=rstate; x:=xstate; y:=ystate; m:=mstate; jt:=j;
vt:=vi; snd:=send; sif:=sendingiframe; ab:=aborting;
tnt:=tn and 7;  t0t:=t and 63;
sensept(p,16*256,recdev); p0:=p.p;
sensept(p,17*256,recdev); p1:=p.p;
sensept(p,18*256,recdev); p2:=p.p;
sensept(p,19*256,recdev); p3:=p.p;
sensept(p,16*256,xmtdev); p4:=p.p;
sensept(p,17*256,xmtdev); p5:=p.p;
sensept(p,18*256,xmtdev); p6:=p.p;
sensept(p,19*256,xmtdev); p7:=p.p;
(***********************************************************************)
end;
with testbuf do next:=next+1;
end;

procedure getresult(var dev:reference);
const
getfl=8*256;  getcnt=24*256;  getadr=0*256;  cntgetpnt=21*256;
var fl:flag;
begin
j:=-1;
repeat
j:=j+1;
sense(cnt,getcnt,dev);
sensest(st,getadr,dev);
if test then if testbit(8) then begin
sensehx(hx,getfl,dev);
otest(7,hx.h1*16+hx.h3,i0);
end;
control(cntgetpnt,dev);
sensefl(fl,getfl,dev);
until (st<>st0) or not fl(13);
while fl(13) do begin
if test then if testbit(8) then begin
sensehx(hx,getfl,dev);
otest(7,hx.h1*16+hx.h3,i0);
end;
control(cntgetpnt,dev);
sensefl(fl,getfl,dev);
end;
end;

procedure event(cause: integer);
begin
if open(eventqueue) then begin
wait(mw,eventqueue);
mw^.u2:=8*cause; mw^.u3:=reclev;
return(mw);
end else if eventlost=-1 then eventlost:=cause else eventlost:=cause+16;
end;

procedure exception(cause: integer);
var r: reference;
begin
trace(cause);
otest(8,cause,discp);
event(15);
repeat
wait(r,sem);
with r^ do
if u2=message then begin
if (u1=testmess) and (u3 mod 2 = 1) then begin
copytest(r); u3:=reclev; u2:=0; return(r);
end else
if (u1=eventmess) and (eventlost<>-1) then begin
signal(r,eventqueue); event(eventlost); eventlost:=-1;
end else begin u2:=3; return(r) end;
end else release(r);
until false;
end;

procedure cmdraction(c,e: integer);
begin
if vr>=0 then resetaction;
t:=1; tn:=0; event(e);
xstate:=xcmdr; rstate:=4; cns:=1;
with cmdrout do begin
cause:=c; cmd:=op.c; cnt.nr:=ovr; cnt.ns:=ovs;
if op.a=you then cnt.p:=1 else cnt.p:=0;
end;
end;

procedure count(var v: integer);
begin
if v=-1 then v:=0 else v:=uadd(v,1);
end;

procedure cntmodem;
begin
with stc do begin
if st.sqd and not st1.sqd then count(sqdoff);
if st.dsr and not st1.dsr then count(dsroff);
if st.dcd and not st1.dcd then count(dcdoff);
if st.ci  and not st1.ci  then count(cion);
st1:=st;
end;
end;

procedure dblcnt(var v: dblint);
begin with v do
if l<>-1 then l:=uadd(l,1) else begin l:=0; count(h) end;
end;

procedure returnque(var q: semaphore; c,lev: integer);
begin
while open(q) do begin
wait(mw,q); mw^.u2:=c; mw^.u3:=lev; return(mw);
end;
end;

procedure returnunused;
begin
for i:=0 to 7 do returnque(priq(i)^,1,xmtlev);
returnque(ique,1,reclev);
returnque(eventqueue,1,reclev);
end;

procedure testaction;
begin
if m^.u3=129 then begin
trace(m^.u4); m^.u3:=reclev; return(m);
end else begin
asgnbit(testbit,m^.u3);
m^.u3:=reclev; m^.u2:=0;
test:=testbit(13);
if testbit(15) then copytest(m);
if testbit(14) then
if testbit(15) then while open(testsem) do begin
return(m); wait(m,testsem); m^.u2:=1;
end else with testbuf do
if last>first then begin
copytest(m); return(m);
end else signal(m,testsem)
else return(m);
end;
end;
\f


process recp(var sem:semaphore);
const
enable=18*256;
startrec=16*256+14;
setfll=12*256;
cntsetpnt=20*256;
var
m,dev:reference;
procedure prepdma(fh,fl:integer; var m,dev:reference); external;
procedure control(w:integer; var dev:reference); external;
procedure controlclr(w:integer; var dev:reference); external;
begin
wait(dev,sem);
channel dev do repeat
wait(m,sem);
case m^.u1 of
0: begin
control(setfll+4,dev); control(cntsetpnt,dev);
control(startrec-14,dev); prepdma(4,2,m,dev);
end;
1: ;
2: control(startrec,dev);
end;
controlclr(enable,dev);
return(m);
until false;
end;

process xmtp(var sem:semaphore);
const enable=18*256;
var m,dev:reference;
procedure controlclr(w:integer; var dev:reference); external;
begin
wait(dev,sem);
channel dev do repeat
wait(m,sem);
controlclr(enable,dev);
return(m);
until false
end;

begin
xmtlev:=reclev+1;
qs:=ref(qs1);

j:=create('rec',recp(rec),recshadow,recsize);
if j<>0 then exception(40+j);
start(recshadow,0);
j:=create('xmt',xmtp(xmt),xmtshadow,xmtsize);
if j<>0 then exception(40+j);
start(xmtshadow,0);
j:=reservech(recdev,reclev,-1);
if j<>0 then exception(50+j);
alloc(m,headpool,s);
j:=copychm(m,recdev); signal(m,rec);
j:=reservech(xmtdev,xmtlev,-1);
if j<>0 then exception(50+j);
alloc(m,headpool,s);
j:=copychm(m,xmtdev); signal(m,xmt);

with testbuf do begin first:=0; last:=0; next:=0 end;

setmodem(modem,xmtdev);
control(0,xmtdev);
control(0,recdev);
control(3*256+0,xmtdev);
control(5*256+0,recdev);
control(7*256+0,recdev);

alloc(mc,framepool,sem);
lock mc as h: headbuf do begin
h.fh.a:=0; mc^.u2:=conansw; h.first:=6; h.last:=7;
end;

for i:=-1 to 8 do priq(i):=ref(priq1(i));
alloc(m,headpool,s);
signal(m,priq1(-1));

alloc(mx,framepool,sem);
lock mx as h:headbuf do begin
mx^.u2:=xmtansw; h.first:=6; h.last:=7;
end;

alloc(cmdrbuf,cmdrpool,s);
lock cmdrbuf as h: minbuf do begin
h.first:=6; h.last:=7; h.inf.cnt.i:=0;
end;

for l:=1 to 2 do begin
alloc(m,framepool,sem);
lock m as h: headbuf do begin
m^.u1:=0; m^.u2:=recansw; h.first:=6; h.last:=7;
h.fh.a:=85; m^.u3:=l;
end;
if l=1 then begin prepdma(4,2,m,recdev); m^.u1:=1 end;
signal(m,rec);
end;

alloc(m,headpool,sem);
m^.u2:=timeransw; m^.u3:=200; m^.u4:=0;
sendtimer(m);

repeat
wait(m,sem);
case m^.u2 of
message:
begin
if test then if testbit(11) then
otest(((m^.u3+128) mod 256 - 128)* 256+2,m^.u1,rr);
case m^.u1 of
inputmess:
case bstate of
0:
begin
bstate:=1; b1:=:m;
sensesem(m,rec);
if not nil(m) then begin
setdata(b1); readframe;
m^.u1:=1; signal(m,rec);
end;
end;
1:
begin
bstate:=2; b2:=:m;
sensesem(m,rec);
if not nil(m) then begin
bstate:=3; setdata(b2);
m^.u1:=2; signal(m,rec);
end;
end;
2: signal(m,sem);
3,4:
begin
bstate:=4; signal(m,ique)
end;
end;

outputmess:  signal(m,priq(m^.u3)^);

connectmess:
if rstate>12 then begin m^.u2:=12; m^.u3:=reclev; return(m) end else begin
lock m as h:record
first,last,next:integer;
mode: packed record
na1,na2,noscom,nopoll: boolean;
delayinf,delayrr: bit;
finalalarm,autocon:boolean;
end;
id,t1,n2,k:integer
end do with h.mode do begin
l:=(h.id+1) div 2; k:=h.k; n2:=h.n2; t2:=(h.t1+1) div 2; auto:=autocon;
nofinalalarm:=not finalalarm;
ymode:=delayinf+1; bmode:=delayrr;
pollmode:=not nopoll;
scommode:=not(noscom or nopoll);
end;
m^.u2:=0; m^.u3:=reclev; return(m);
if rstate>2 then begin
if st.dsr or st.cts then begin
rstate:=11; t1:=l+2; t:=t1-1;
if not nil(mc) then begin
modem:=connectline; setmodem(modem,xmtdev);
prepdma(12,0,mc,xmtdev);
control(startxmt+1,xmtdev);
signal(mc,xmt);
time:=0;
end;
end else begin
xstate:=xsabmp; t:=1;
if l>1 then begin
rstate:=7; t1:=l;
end else begin
rstate:=6; t1:=t2;
if l=0 then begin
me:=dte; you:=dce;
end else begin
me:=dce; you:=dte;
end;
end;
end;
end; <* rstate>2 *>
end; <* connectmess *>

disconnectmess:
begin
case rstate of
0,1,2: begin
polling:=nofinalalarm;
resetaction; rstate:=9; xstate:=xdiscp; event(1);
end;
3,4,6: begin rstate:=9; xstate:=xdiscp; end;
5:     rstate:=10;
7,8,11,12: begin rstate:=10; xstate:=xi; end;
9,10,13,14:  ;
end;
m^.u2:=0; m^.u3:=reclev; return(m);
t:=1; tn:=0;
end;

testmess: testaction;

eventmess:
begin
signal(m,eventqueue);
if eventlost<>-1 then begin event(eventlost); eventlost:=-1; end;
end;

statmess,statclrmess:
begin
lock m as d: statistics do begin d:=stc; d.time:=time end;
if m^.u1=statclrmess then stc:=stc0;
m^.u2:=0; m^.u3:=reclev; return(m);
end;

sensemess:
with st do begin
if rstate<3 then l:=112 else l:=120;
if dsr then l:=l-16;
if dcd then l:=l-32;
if sqd then l:=l-64;
if ci then l:=l+128;
m^.u2:=l; m^.u3:=reclev; return(m);
end;

returnallmess:
begin
control(0,recdev);
sensesem(mw1,rec);
setinterrupt(recdev);
if send then control(abort,xmtdev);
returnunused;
while not nil(b1) do begin
b1^.u2:=1; b1^.u3:=reclev; return(b1); b1:=:b2;
end;
returnque(priq(8)^,9,xmtlev);
returnque(qs^,9,xmtlev);
b1:=:m;
repeat
wait(m,sem);
case m^.u2 of
message:
if m^.u1=testmess then testaction
else begin
m^.u2:=1;
if m^.u1=outputmess then m^.u3:=xmtlev else m^.u3:=reclev;
return(m);
end;

recansw: begin mw:=:mw1; mw1:=:m end;

xmtansw:
begin
if sendingiframe then begin
mx^.u2:=9; mx^.u3:=xmtlev; return(mx);
end;
mx:=:m; send:=false;
end;

timeransw:
begin
if time=9999 then time:=0 else time:=time+1;
m^.u3:=100; m^.u4:=0; sendtimer(m);
end;

conansw: mc:=:m;
otherwise m^.u2:=4; m^.u3:=reclev; return(m);
end;
until not(send or nil(mw));
if rstate>12 then begin ml^.u2:=1; ml^.u3:=reclev; return(ml) end;
b1^.u2:=0; b1^.u3:=reclev; return(b1);
mw^.u1:=1; prepdma(4,2,mw,recdev);
signal(mw,rec);
mw1^.u1:=0; signal(mw1,rec);
rstate:=10;
control(0,xmtdev);
sendingiframe:=false; aborting:=false; sendok:=true;
mstate:=true; bstate:=0; xstate:=0; ystate:=0;
t:=0; tn:=0; vi:=0; vs:=0; vr:=-1;
recerr:=0; xmterr:=0; eventlost:=-1;
preack:=false;
end; <* returnallmess *>

returnunusedmess:
begin
if bstate=4 then bstate:=3;
returnunused;
m^.u2:=0; m^.u3:=reclev; return(m);
end;

modemmess:
begin
lock m as buf:record
n1,n2,n3: integer;
updaterts,rts,updatedtr,dtr: bit;
end do with buf do begin
if updaterts=1 then modem.rts:=1-rts;
if updatedtr=1 then modem.dtr:=1-dtr;
setmodem(modem,xmtdev);
end;
m^.u2:=0; m^.u3:=reclev; return(m);
end;

linespeedmess:
if (rstate=9) or (rstate=10) then begin
if send then begin control(abort,xmtdev); aborting:=true; t1:=2 end
else if st.cts then begin
modem:=connectline; setmodem(modem,xmtdev);
prepdma(12,0,mc,xmtdev);
control(startxmt+1,xmtdev);
signal(mc,xmt); time:=0;
t1:=2;
end else t1:=1;
t:=1; rstate:=14; xstate:=xi; ml:=:m;
end else begin
m^.u2:=2; m^.u3:=reclev; return(m);
end;

otherwise m^.u2:=4; m^.u3:=reclev; return(m);
end;
end; <* message *>
\f


recansw:
begin
getresult(recdev);
frameok:=(st.error=noerror) and not st.ffo; ack:=false; validinf:=false;
if frameok then begin
lock m as h:headbuf do begin op:=h.fh; h.fh.a:=85 end;
if not nil(b1) and
(op.c.i=0) and (op.a=me) and (op.c.ns=vr) and not st.size then begin
ack:=setlength(b1); validinf:=true; vr:=(vr+1) and 7;
end;
end;
if ack then begin
b1^.u2:=0; b1^.u3:=reclev; return(b1); b1:=:b2;
dblcnt(stc.reci);
case bstate of
1: begin bstate:=0; m^.u1:=0; end;
2: begin setdata(b1); readframe; m^.u1:=1; bstate:=1 end;
3: begin prepdma(4,2,m,recdev); m^.u1:=1; bstate:=1 end;
4: begin
wait(b2,ique); if passive(ique) then bstate:=3;
m^.u1:=2; prepdma(4,2,m,recdev); setdata(b2);
end;
end;
end else begin
<* not valid iframe *>
if frameok and (op.c.ns=3) and (op.c.i=1) then with stc do
<* cmdrframe *>
if st.size then cmdrin.cnt.i:=1 else
lock b1 as d:minbuf do cmdrin:=d.inf;

case bstate of
0: m^.u1:=0;
1: begin setdata(b1); readframe; m^.u1:=1 end;
2: begin setdata(b1); readframe; setdata(b2); m^.u1:=2; bstate:=3 end;
3,4: begin b1:=:b2; prepdma(4,2,m,recdev); setdata(b2); m^.u1:=2 end;
end;
end;
aux:=m^.u3;
signal(m,rec);
if st<>st1 then cntmodem;

if test then if testbit(12) then otest(aux*256,op.a,op.c);

if frameok then begin
if op.a or 2 = 3 then begin
<* the frameheader is processed *>
if op.c.i=0 then cns:=iframe else cns:=op.c.ns;
if cns and 1 =0 then begin
<* iframe or sframe *>
if rstate<3 then begin
<* connected state *>
i:=(vs-op.c.nr) and 7;
ack:=i<vi;
while i<vi do begin
vi:=vi-1;
if open(qs^) then begin
wait(mw,qs^); mw^.u2:=0; mw^.u3:=xmtlev; return(mw);
end else preack:=true;
end;
poll:=op.c.p=1;
if i=vi then begin
if tn>0 then begin
if poll then begin
t:=1; if op.a=you then begin tn:=0; rejaction; end else tn:=1;
if xstate=xspcommand then xstate:=xi;
end else if not pollmode and ack then begin
tn:=0; t:=1;
end;
end else if ack then t:=1;
end else if vi>=0 then cmdraction(causez,10);
if poll then
if (op.a=you) then begin
if not polling then begin
if vr>=0 then resetaction;
xstate:=xsabmp; rstate:=6; cns:=1; t:=1; tn:=0; event(8);
end;
end else begin
xstate:=xspresponse; rstate:=0;
end
else if ack then polling:=nofinalalarm;

case cns of
iframe:
if validinf then begin
rstate:=0; if xstate<=xuap then xstate:=xis;
end else if op.a=me then if not st.size then begin
if xstate<=xuap then if rstate<>1 then xstate:=xis;
rstate:=1;
end else if j>0 then cmdraction(causey,9);
rrframe:
begin
if rstate=2 then begin rstate:=0; xstate:=xi; tn:=0 end;
if ystate>0 then begin
ystate:=0;
if ymode=2 then rejaction;
end;
end;
rnrframe:
begin
if rstate=2 then begin rstate:=0; xstate:=xi; tn:=0 end;
if vi=1 then ystate:=2 else begin
ystate:=ymode; if vi>1 then rejaction;
end;
count(stc.recrnr);
end;
rejframe:
begin
if rstate=2 then begin rstate:=0; xstate:=xi; tn:=0 end;
count(stc.recrej); ystate:=0; rejaction;
end;
1: ;
otherwise cmdraction(causew,7);
end;
end else <* disconnected state *>
if rstate<11 then begin
if op.c.p=1 then if rstate=4 then xstate:=xcmdr else begin
xstate:=xdmp; if rstate=6 then rstate:=3;
end;
end;
end else begin
<* uframe *>
if rstate<2 then resetaction;
polling:=nofinalalarm;
if rstate<11 then
if op.a=me then case op.c.nr of
discframe:
begin
if rstate<3 then xstate:=xua else xstate:=xdm;
if op.c.p=1 then xstate:=xstate+1;
if rstate<9 then begin
if rstate<>5 then event(2);
if rstate>6 then t1:=t2; rstate:=5;
end else rstate:=10;
t:=0;
end;
sabmframe:
begin
case rstate of
2,6,7:      begin rstate:=2; xstate:=xua; vr:=0; event(0) end;
0,1,3,4,5,8:begin rstate:=0; xstate:=xua; vr:=0; event(0) end;
9,10:       begin rstate:=10; xstate:=xdm; end;
end;
if op.c.p=1 then xstate:=xstate+1;
t1:=t2; tn:=0; t:=0;
end;
sarmframe:
case rstate of
7,8,10: ;
9: if xstate=xi then if op.c.p=1 then xstate:=xdmp else xstate:=xdm;
otherwise cmdraction(causew,7);
end;
cmdrframe:
begin
if test then with stc.cmdrin do begin
otest(5,cause,cnt); otest(6,cause,cmd);
end;
case rstate of
0,1,2: cmdraction(causew,7);
3,4,6: begin event(6); rstate:=5 end;
7,8: begin
rstate:=7; t:=1; i:=me; me:=you; you:=i; xstate:=xsabmp;
end;
otherwise
end;
end;
otherwise if rstate<3 then cmdraction(causew,7);
end else begin
<* op.a=you *>
case op.c.nr of
dmframe:
begin
if rstate<3 then event(5);
case rstate of
0,1,2,3,4: begin rstate:=6; xstate:=xsabmp; t:=1 end;
5,8,10:    ;
6,7:
if op.c.p=1 then begin rstate:=5; t1:=t2; t:=0; event(2) end;
9:         if op.c.p=1 then begin rstate:=10; t:=0 end;
end;
end;
uaframe:
case rstate of
0,1:    begin rstate:=6; xstate:=xsabmp; t:=1; event(4) end;
2:      if op.c.p=1 then begin
rstate:=0; xstate:=xi; vr:=0; t:=0;
end else begin
rstate:=6; xstate:=xsabmp; t:=1; event(4);
end;
3:      begin xstate:=xdm; t:=1 end;
4:      if op.c.p=1 then begin xstate:=xcmdr; t:=1 end;
5,8,10: ;
6,7:
if op.c.p=1 then begin
rstate:=0; xstate:=xi; vr:=0; t1:=t2; t:=0; event(0);
end;
9:      if op.c.p=1 then begin rstate:=10; t:=0 end;
end;
cmdrframe:
begin
if test then with stc do begin
otest(5,cmdrin.cause,cmdrin.cnt);
otest(6,cmdrin.cause,cmdrin.cmd);
end;
event(6);
case rstate of
7,8:  ;
9,10: begin rstate:=10; xstate:=xdm; t:=0 end;
otherwise rstate:=6; xstate:=xsabmp; t:=1;
end;
end;
sabmframe:
if rstate=8 then begin
rstate:=2; if op.c.p=1 then xstate:=xuap else xstate:=xua;
i:=me; me:=you; you:=i; vr:=0; t1:=t2; t:=0; event(0);
end else if rstate<3 then cmdraction(causew,7);
otherwise if rstate<3 then cmdraction(causew,7);
end;
tn:=0;
end
else xstate:=xi;
end; <* uframe *>
end;
recerr:=0;
end else begin
if st.error and abst = 0 then
if recerr=n2 then begin
recerr:=0; event(13);
end else recerr:=recerr+1;
with stc do begin
if st.ffo then count(overrun);
if (st.error and abst)<>0 then count(recabort);
dblcnt(skip);
end;
end;
end; <* recansw *>

xmtansw:
begin
getresult(xmtdev);
if test then if testbit(12) then
lock m as h:headbuf do otest(1,h.fh.a,h.fh.c);
if st<>st1 then cntmodem;
if aborting then begin
signal(mx,qs^);
retransmit; aborting:=false; sendingiframe:=false;
end else begin
if (st.error=noerror) and not st.xmtu then begin
if sendingiframe then begin
send:=setlength(mx); sendingiframe:=false;
if preack then begin
mx^.u2:=0; mx^.u3:=xmtlev; return(mx); preack:=false;
end else signal(mx,qs^);
end else if nil(cmdrbuf) then cmdrbuf:=:mx;
xmterr:=0;
end else begin
if xmterr=n2 then begin
xmterr:=0; event(14);
end else xmterr:=xmterr+1;
sendok:=false;
with stc do begin
if st.xmtu then count(underrun);
dblcnt(retr);
end;
end;
end;
mx:=:m;
send:=false;
end; <* xmtansw *>

timeransw:
begin
if time=9998 then time:=0 else time:=time+2;
if t>0 then if t>=t1 then begin
case rstate of
0,1:
if (tn>0) or (vi>0) then begin
if tn<=n2 then begin
if pollmode then begin
xstate:=xspcommand; polling:=true;
end else xstate:=xis;
if scommode then ystate:=2 else begin
op.c.nr:=(vs-vi) and 7; rejaction;
ystate:=1;
end;
tn:=tn+1; count(stc.timeout);
end else begin
resetaction;
event(11);
xstate:=xsabmp; rstate:=6;
end;
t:=1;
end else t:=0;
2,3,6:
begin
if tn<n2 then begin
rstate:=6; xstate:=xsabmp; t:=1; tn:=tn+1;
end else begin
if auto then event(11) else begin
rstate:=10; event(12);
end;
tn:=0;
end;
end;
4:
begin
t:=1;
if tn<n2 then begin
xstate:=xcmdr; tn:=tn+1;
end else begin
event(11);
tn:=0; rstate:=6; xstate:=xsabmp;
end;
end;
5,10: t:=0;
7:    begin rstate:=8; t:=1; end;
8:    begin rstate:=7; xstate:=xsabmp; t:=1 end;
9:    if tn<n2 then begin
xstate:=xdiscp; t:=1; tn:=tn+1;
end else begin
rstate:=10; event(12);
end;
11,13: begin event(14); t:=0 end;
12: begin
prepdma(12,0,mc,xmtdev);
control(startxmt+1,xmtdev);
signal(mc,xmt);
t:=t1; rstate:=11;
end;
14:
if t1=5 then begin
sense(cnt,getcnt,xmtdev);
control(abort,xmtdev);
rstate:=13;
end else if st.cts then begin
prepdma(12,0,mc,xmtdev);
control(startxmt+1,xmtdev);
signal(mc,xmt);
t:=t1; rstate:=13;
end else if send then begin event(14); rstate:=10 end else begin
control(0,xmtdev);
prepdma(2,0,mc,xmtdev);
control(setflh+12,xmtdev);
control(setfll+6,xmtdev);
control(cntgetpnt,xmtdev);
control(startxmt,xmtdev);
signal(mc,xmt);
t:=1; t1:=5;
end;
end;
end else t:=t+1;
m^.u3:=200; m^.u4:=0; sendtimer(m);
end; <* timeransw *>

conansw:
begin
mc:=:m;
if rstate=11 then begin
getresult(xmtdev);
if st.dsr or st.cts then rstate:=12 else
begin <* modem ready *>
modem.rxe:=1; setmodem(modem,xmtdev);
xstate:=xsabmp; t:=1; time:=0;
if t1>3 then begin
rstate:=7; t1:=t1-2;
end else begin
rstate:=6;
if t1=2 then begin
me:=dte; you:=dce;
end else begin
me:=dce; you:=dte;
end;
t1:=t2;
end;
end; <* modem ready *>
end else if rstate=13 then with ml^ do begin
if t1=5 then begin
control(0,xmtdev);
i:=1; cnt:=cnt+2;
stc.rate:=cnt;
if cnt<0 then cnt:=maxrate else
if cnt>2000 then l:=cnt div 100*(u3 div 16) + (u3 and 15) else
l:=u3 div 16 * cnt div 100 + (u3 and 15);
if cnt < maxrate then begin
while cnt > byterate(i)+l do i:=i+1;
if cnt < byterate(i)-l then u2:=88 else u2:=8*i;
end else u2:=88;
u3:=reclev; return(ml);
rstate:=10;
end else begin sensest(st,getadr,xmtdev); rstate:=14 end;
end;
end; <* conansw *>

otherwise if test then otest(4,m^.u2,rr); m^.u2:=4; return(m);
end;

if not send then begin
lock mx as h:headbuf1 do with h do begin
<* xmt idle *>
send:=true;
if sendok then begin
case xstate of
xi, xis,xspcommand:
if rstate<3 then begin
if (rstate<>1) and ((bstate<=bmode)=mstate) then begin
if mstate then op.c:=rnr else op.c:=rr;
mstate:=not mstate;
end else if (rstate=1) and (xstate<>xi) then op.c:=rej else
if (ystate<2) and (vi<k) then begin
i:=8; while passive(priq(i)^) do i:=i-1;
if i>-1 then begin
if i=8 then dblcnt(stc.retr);
wait(m,priq(i)^);
op.c:=i0; op.c.ns:=vs; sendingiframe:=true;
vs:=(vs+1) and 7; vi:=vi+1; if vi=1 then t:=1;
if ystate=1 then ystate:=2;
end else if xstate<>xi then
if mstate then op.c:=rr else op.c:=rnr
else send:=false;
end else if xstate<>xi then
if mstate then op.c:=rr else op.c:=rnr
else send:=false;
if send then with stc do begin
if op.c=rnr then count(xmtrnr);
if op.c=rej then count(xmtrej);
if op.c.i=0 then dblcnt(xmti);
op.c.nr:=vr; op.a:=you;
if xstate=xspcommand then op.c.p:=1;
end;
end else send:=false;
xua,xuap:
begin op.a:=me; op.c:=ua; if xstate=xuap then op.c.p:=1 end;
xspresponse:
begin
op.a:=me;
if rstate=1 then begin
op.c:=rej; count(stc.xmtrej);
end else begin
mstate:=bstate>bmode;
if mstate then op.c:=rr else begin
op.c:=rnr; count(stc.xmtrnr);
end;
end;
op.c.p:=1; op.c.nr:=vr;
end;
xdm,xdmp:
begin op.c:=dm; op.a:=me; if xstate=xdmp then op.c.p:=1 end;
xsabmp: begin op.c:=sabmp; op.a:=you end;
xcmdr: begin
op.c:=cmdr; op.a:=me; 
lock cmdrbuf as b: minbuf do b.inf:=cmdrout;
m:=:cmdrbuf;
end;
xdiscp: begin op.c:=discp; op.a:=you end;
end;
xstate:=xi;
end else sendok:=true;
if test then if testbit(10) then if send then otest(3,op.a,op.c);
end;
if send then begin
if nil(m) then prepdma(14,0,mx,xmtdev) else begin
prepdma(2,0,mx,xmtdev);
i:=0; l:=0;
repeat
i:=i+1; pop(mw,m);
while mw^.size=0 do begin push(mw,mw1); pop(mw,m) end;
if nil(m) then l:=12 else if m^.size=0 then l:=12;
prepdma(l,6,mw,xmtdev);
push(mw,mw1);
until l=12;
while not nil(mw1) do begin
pop(mw,mw1); push(mw,m);
end;
m^.u2:=i;
end;
control(setfll,xmtdev);
control(startxmt,xmtdev);
signal(mx,xmt); m:=:mx;
end;
end;
until false;
end
.
▶EOF◀