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job pm 5 600 time 11 0 area 11 size 90000, 
output 300000,
temp disc 1000 20,
perm disc 100 1
o code
head
claim
mode list.yes
(t1=copy 25.2
i t1)
(t=edit t1
if ok.no
(o c
convert code
finis))
d./-text ****/,d3,
d./:-text ****/
l./-text ****/
s0,f
l1=indent t mark lc
l2=cross l1 bossline.yes
convert l2
clear temp l1
b=set 1 disc
head 1 cpu
(b=pascal80 codelist.yes t
if ok.yes
(head cpu
o c
edit code
if ok.yes
scope user b)
o c
lookup b
convert code
finis)
l b,p-15,l-15,l./end of PASCAL80 compilation/,f
hdlc-text *************************************************\f


process hdlc(var sem:semaphore; reclev:integer);
const
recsize=300;
xmtsize=300;
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;

status      =packed record
         sqd,ffo,ffoi,xmtu,cts,dsr,dcd,ci: 0..1;
         error: errortype;
         eom,som: 0..1
       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..10;
y: 0..2;
m: boolean;
jt: 0..3;
vt,tnt: 0..7;
t0t: 0..31;
snd,sif,ab: boolean;
(****************************************************************)
end;
end;

flag        =packed array (0..15) of boolean;

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;

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;

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

<* modemcontrol *>
rts =32;
dtr =16;
ci  =8;
rate=4;
txe =2;
rxe =1;

connectline=19*256+txe;

<* 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;
st0=status(0,0,0,0,0,0,0,0,noerror,0,0);

var
send,sendingiframe,aborting: boolean:=false;
frameok,validinf,ack,poll,auto: boolean;
sendok,test,test1,mstate: boolean:=true;
rstate: integer:=10;
bstate,xstate,ystate,t,tn,time,vi,vs:integer:=0;
vr:integer:=-1;
modem: integer:=19*256+rts+dtr;
me:integer:=dce;
you:integer:=dte;
recerr,xmterr: integer:=0;
eventlost: integer:=-1;
xmtlev,k,n2,t1,t2,i,j,l,ovs,ovr,cns:integer;
cnt: array (0..3) of integer;
st: status:=status(0,0,0,0,1,1,0,0,noerror,0,0);
bit: flag;
m,mh,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 4;
framepool: pool 5 of headbuf;
cmdrpool: pool 1 of minbuf;
priq1: array (-1..8) of semaphore;
priq: array (-1..8) of ^semaphore;
qs,qw: ^semaphore;
cmdrout,cmdrin: cmdrinf;

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 getresult(var dev:reference);
const
getfl=8*256;  getcnt=24*256;  getadr=0*256;  cntgetpnt=21*256;
var w: status; fl:flag;
begin
i:=-1;
repeat
i:=i+1;
sense(cnt(i),getcnt,dev);
sensest(w,getadr,dev);
control(cntgetpnt,dev);
sensefl(fl,getfl,dev);
if w<>st0 then begin j:=i; st:=w end;
until not fl(13);
end;

procedure setlength(var m:reference);
begin
pop(mw,m);
for l:=1 to i do begin
while mw^.size=0 do begin
push(mw,mw1); pop(mw,m);
end;
lock mw as d:pntbuf do d.next:=d.last+1-cnt(l);
end;
push(mw,m);
while not nil(mw1) do begin
pop(mw,mw1); push(mw,m);
end;
end;

procedure setdata(var m:reference);
var fh,fl:integer;
begin
fl:=4;
pop(mw,m);
repeat
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);
fl:=14;
until fh>0;
push(mw,m);
while not nil(mw1) do begin
pop(mw,mw1); push(mw,m);
end;
end;

procedure readframe;
begin
control(startrec,recdev);
prepdma(4,2,mh,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;
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; tnt:=tn; t0t:=t; snd:=send; sif:=sendingiframe; ab:=aborting;
(***********************************************************************)
end;
with testbuf do next:=next+1;
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;
\f


process recp(var sem:semaphore);
const
enable=18*256;
startrec=16*256+10;
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(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
trace(0);
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;

control(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,asem);
lock mc as h: headbuf do begin 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 3 do begin
alloc(mh,framepool,sem);
lock mh as h: headbuf do begin
mh^.u1:=0; mh^.u2:=recansw; h.first:=6; h.last:=7;
end;
if l=1 then begin prepdma(4,2,mh,recdev); mh^.u1:=1 end;
if l<>3 then signal(mh,rec);
end;

alloc(m,headpool,sem);
m^.u2:=timeransw; m^.u3:=100; m^.u4:=0;
sendtimer(m);

repeat
wait(m,sem);
case m^.u2 of
message:
begin
if test then otest(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:
begin
lock m as h:record
first,last,next:integer;
auto:boolean;
id,t1,n2,k:integer
end do begin
l:=h.id; k:=h.k; n2:=h.n2; t2:=h.t1; auto:=h.auto;
end;
m^.u2:=0; m^.u3:=reclev; return(m);
if rstate>2 then begin
while (st.dsr=1) or (st.cts=1) do begin
modem:=connectline; control(modem,xmtdev);
prepdma(12,0,mc,xmtdev);
control(startxmt+1,xmtdev);
signal(mc,xmt);
wait(mc,asem);
getresult(xmtdev);
if (st.dsr=1) or (st.cts=1) then begin
mc^.u3:=100; mc^.u4:=0; sendtimer(mc);
wait(mc,asem);
end;
if auto then time:=0;
end;
modem:=modem+rxe; control(modem,xmtdev);
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; <* rstate>2 *>
end; <* connectmess *>

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

testmess:
begin
asgnbit(bit,m^.u3);
m^.u3:=reclev; m^.u2:=0;
test:=bit(13);
test1:=bit(12);
if bit(15) then copytest(m);
if bit(14) then
if bit(15) then while open(testsem) do begin
return(m); wait(m,testsem); m^.u2:=1;
end else signal(m,testsem)
else return(m);
end;

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


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

recansw:
begin
getresult(recdev);
frameok:=st.error=noerror; validinf:=false;
if frameok then begin
lock m as h:headbuf do op:=h.fh;
validinf:=(op.c.i=0) and (op.a=me) and (op.c.ns=vr) and (st.ffo=0);
end;
if validinf then begin
setlength(b1);
b1^.u2:=0; b1^.u3:=reclev; return(b1); b1:=:b2;
vr:=(vr+1) mod 8;
case bstate of
1: begin bstate:=0; mh^.u1:=0; end;
2: begin setdata(b1); readframe; mh^.u1:=1; bstate:=1 end;
3: begin readframe; mh^.u1:=1; bstate:=1 end;
4: begin
wait(b2,ique); if passive(ique) then bstate:=3;
mh^.u1:=2; prepdma(4,2,mh,recdev); setdata(b2);
end;
end;
end else begin
<* not valid iframe *>
if op.c.ns=3 then if (op.c.i=1) and (st.ffo=0) and frameok then
<* cmdrframe *>
lock b1 as d:minbuf do cmdrin:=d.inf
else cmdrin.cnt.i:=1;

case bstate of
0: mh^.u1:=0;
1: begin setdata(b1); readframe; mh^.u1:=1 end;
2: begin setdata(b1); readframe; setdata(b2); mh^.u1:=2; bstate:=3 end;
3,4: begin b1:=:b2; prepdma(4,2,mh,recdev); setdata(b2); mh^.u1:=2 end;
end;
end;
signal(mh,rec); mh:=:m;

if test then otest(0,op.a,op.c);

if frameok then begin
if((op.a=me) or (op.a=you)) then begin
<* the frameheader is processed *>
if op.c.i=0 then cns:=iframe else cns:=op.c.ns;
if cns mod 2 =0 then begin
<* iframe or sframe *>
if rstate<3 then begin
<* connected state *>
i:=(vs-op.c.nr+8) mod 8;
ack:=i<vi;
while i<vi do begin
vi:=vi-1;
wait(mw,qs^); mw^.u2:=8; mw^.u3:=xmtlev; return(mw);
end;
poll:=op.c.p=1;
if i=vi then begin
if tn>0 then begin
if poll then begin
poll:=op.a=me; tn:=0; t:=1; rejaction;
if xstate=xspcommand then xstate:=xi;
end;
end else if ack then t:=1;
end else if vi>=0 then begin
cmdrout.cause:=causez; xstate:=xcmdr; cns:=1; event(10);
end;
if poll then
if (op.a=you) then begin
xstate:=xsabmp; rstate:=6; cns:=1;
end else begin
xstate:=xspresponse; rstate:=0;
end;

case cns of
iframe:
if validinf then begin
rstate:=0; if xstate<=xuap then xstate:=xis;
end else if op.a=me then if st.ffo=0 then begin
if xstate<=xuap then if rstate=1 then xstate:=xi
else xstate:=xis;
rstate:=1;
end else if j>0 then begin
xstate:=xcmdr; cmdrout.cause:=causey; event(9);
end;
rrframe:
begin if rstate=2 then begin rstate:=0; xstate:=xi; end; ystate:=0 end;
rnrframe:
begin if rstate=2 then begin rstate:=0; xstate:=xi; end; ystate:=1;
rejaction;
end;
rejframe:
begin if rstate=2 then begin rstate:=0; xstate:=xi; end; ystate:=0;
rejaction;
end;
1: ;
otherwise
xstate:=xcmdr; cmdrout.cause:=causew; event(7);
end;

if xstate>=xdm then begin
resetaction;
if xstate=xcmdr then with cmdrout do begin
rstate:=4; cmd:=op.c; cnt.nr:=ovr; cnt.ns:=ovs;
if op.a=you then cnt.p:=1 else cnt.p:=0;
end;
end;
end else <* disconnected state *>
if op.c.p=1 then if rstate=4 then xstate:=xcmdr else begin
xstate:=xdmp; if rstate=6 then rstate:=3;
end else if rstate=6 then begin
rstate:=3; xstate:=xdm;
end;
end else begin
<* uframe *>
if rstate<2 then resetaction;
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>6 then t1:=t2; rstate:=5;
if rstate<>5 then event(2);
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;
t:=0;
end;
sarmframe:
case rstate of
7,8,10: ;
otherwise
if rstate<>9 then rstate:=4;
with cmdrout do begin
cause:=causew; cmd:=op.c; cnt.nr:=ovr; cnt.ns:=ovs;
cnt.p:=0; xstate:=xcmdr;
end;
event(7);
end;
otherwise
end else
<* 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 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
otest(5,cmdrin.cause,cmdrin.cnt); otest(6,cmdrin.cause,cmdrin.cmd);
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;
end;
otherwise
end;
end; <* uframe *>
end;
recerr:=0;
end else if recerr=n2 then begin
recerr:=0; event(12);
end else recerr:=recerr+1;
end; <* recansw *>

xmtansw:
begin
getresult(xmtdev);
if test then lock m as h:headbuf do otest(1,h.fh.a,h.fh.c);
if aborting then begin
signal(mx,qs^);
retransmit; aborting:=false; sendingiframe:=false;
end else begin
if (st.error=noerror) and (st.xmtu=0) then begin
if sendingiframe then begin
setlength(mx); signal(mx,qs^); sendingiframe:=false;
end else if nil(cmdrbuf) then cmdrbuf:=:mx;
xmterr:=0;
end else begin
if xmterr=n2 then begin
xmterr:=0; event(13);
end else xmterr:=xmterr+1;
sendok:=false;
end;
end;
mx:=:m;
send:=false;
end; <* xmtansw *>

timeransw:
begin
if time=9999 then time:=0 else time:=time+1;
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
xstate:=xspcommand; ystate:=2; tn:=tn+1;
end else begin
resetaction;
event(11);
xstate:=xsabmp; rstate:=6;
end;
t:=1;
end else t:=0;
2,3,6:
begin
rstate:=6; xstate:=xsabmp; t:=1;
if tn=n2 then begin
event(11);
tn:=0;
end else tn:=tn+1;
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:    begin xstate:=xdiscp; t:=1 end;
end;
end else t:=t+1;
m^.u3:=100; m^.u4:=0; sendtimer(m);
end; <* timeransw *>

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:
if rstate<3 then begin
if (rstate<>1) and ((bstate=0)=mstate) then begin
if mstate then op.c:=rnr else op.c:=rr;
mstate:=not mstate;
end else if (rstate=1) and (xstate=xis) then op.c:=rej else
if ystate<2 then begin
i:=8; while passive(priq(i)^) do i:=i-1;
if i>-1 then begin
wait(m,priq(i)^);
op.c:=i0; op.c.ns:=vs; sendingiframe:=true;
vs:=(vs+1) mod 8; vi:=vi+1; if vi=1 then t:=1;
if ystate=1 then ystate:=2;
end else if xstate=xis then
if mstate then op.c:=rr else op.c:=rnr
else send:=false;
end else if xstate=xis then
if mstate then op.c:=rr else op.c:=rnr
else send:=false;
if send then begin op.c.nr:=vr; op.a:=you end;
end else send:=false;
xua,xuap:
begin op.a:=me; op.c:=ua; if xstate=xuap then op.c.p:=1 end;
xspresponse,xspcommand:
begin
if xstate=xspresponse then op.a:=me else op.a:=you;
if rstate=1 then op.c:=rej else begin
mstate:=bstate<>0;
if mstate then op.c:=rr else op.c:=rnr;
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 test1 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);
l:=0;
pop(mw,m);
repeat
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,2,mw,xmtdev);
until l=12;
push(mw,m);
while not nil(mw1) do begin
pop(mw,mw1); push(mw,m);
end;
end;
control(setfll,xmtdev);
control(startxmt,xmtdev);
signal(mx,xmt); m:=:mx;
end;
end;
until false;
end
.
prepdma-text *********************************************\f


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;
b0,b1,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,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
.
test-text ******************************************************\f


process s(var syst:system_vector);

<****************************************************************>
<*                      hdlcdata                                *>
<*                                                              *>
<*                                                              *>

process hdlcdata(var op,sem1,sem2:semaphore; reclev1,reclev2:integer);
type
iline=record
first,last,next:integer;
name:alfa;
line:array (18..98) of char;
end;

dbuf=record
first,last,next,no:integer;
txti:char;
inf:array (9..133) of char;
end;

ansbuf=record
f1,f2,f3,f4:byte;
f5:integer;
f6:char;
end;

tx2=array(1..2) of char;
tx5=array(1..5) of char;
ciftype=array('0'..'9') of byte;

oelem= record
t1:char;
t2:tx5;
t3:tx2;
t4,t5:tx5;
t6: char;
end;

oline=record
first,last,next:integer;
name:alfa;
inf:array(1..4) of oelem;
e1,e2,e3,e4,e5: char;
end;

const
cif=ciftype(0,1,2,3,4,5,6,7,8,9);
spelem=oelem(' ','     ','  ','     ','     ',',');

var
r,m,comi,como: reference;
asem,qs,opa:semaphore;
c:char;
v,i,l,j,xmtlev1,xmtlev2:integer;
cnt: integer:=0;
dpool:pool 26 of dbuf;
tab: array (18..98) of integer;
s: array('n'..'r') of ^semaphore;
sl: array(8..127) of char;
esc: boolean;
ans: array(1..26) of ansbuf;
ipool:pool 2 of iline;
opool:pool 1 of oline;
data: array('a'..'z') of dbuf;
x: integer:=0;
a: array(1..5) of integer;

procedure out5(var t:tx5; v:integer);
var i:integer;
begin
for i:=5 downto 1 do if v>0 then begin
t(i):=chr(v mod 10 + 48);  v:=v div 10;
end else if i=5 then t(i):='0' else t(i):=sp;
end;

procedure listq;
var i: integer;
begin
l:=1;
while l<j do begin
i:=1;  wait(como,opa);
lock como as d:oline do
repeat
if l<j then with d.inf(i) do
begin
with ans(l) do begin
t1:=sl(f3); out5(t2,f5);
t3(2):=f6;
out5(t4,f4); out5(t5,f2);
end;
l:=l+1;
end else d.inf(i):=spelem;
i:=i+1;
until i>4;
signal(como,op);
end;
j:=1;
end;

begin
trace(0);
for i:=1 to 2 do begin
alloc(r,ipool,asem);
r^.u1:=1; r^.u4:=0;
lock r as d:iline do with d do begin
first:=18; last:=97;
name:='data'
end;
r:=:comi;
end;

alloc(como,opool,opa);
como^.u1:=2;
lock como as d:oline do with d do begin
first:=18; last:=first+76;
name:='data';
for i:=1 to 4 do d.inf(i):=spelem;
e1:=nl;
end;
return(como);

cnt:=0;  j:=1;
xmtlev1:=reclev1+1;
xmtlev2:=reclev2+1;

for i:=8 to 127 do sl(i):='n';
sl(xmtlev1):='o';
sl(xmtlev2):='p';
sl(reclev1):='q';
sl(reclev2):='r';

s('n'):=ref(asem);
s('o'):=ref(sem1);
s('p'):=ref(sem2);
s('q'):=ref(sem1);
s('r'):=ref(sem2);

for c:='a' to 'z' do with data(c) do begin
first:=6; last:=first+20;
txti:=c; inf:='  buffer'; inf(10):=c;
end;

signal(r,op); wait(r,asem);
repeat
esc:=false;  if cnt>9999 then cnt:=0;
signal(comi,op);
r:=:comi;
if comi^.u2=0 then
lock comi as lbuf:iline do with lbuf do begin
i:=first;
line(next):=nl;
repeat
c:=line(i); if nil(m) then alloc(m,dpool,asem);
with m^ do begin
u2:=7; u4:=i;
case c of
'o','p':
begin
lock m as d:dbuf do begin
u1:=2; u3:=cif(line(i+1));
d:=data(line(i+2));
tab(i):=cnt;  d.no:=cnt;  i:=i+2;  cnt:=cnt+1;
end;
signal(m,qs);
end;
'q','r':
begin
lock m as d:dbuf do d:=data('z');
u1:=1; signal(m,qs);
end;
'w','x',nl:
begin
while open(qs) do begin
wait(r,qs); signal(r,s(line(r^.u4))^);
end;
if c=nl then l:=0 else l:=cif(line(i+1));
repeat
wait(r,asem);
if r^.u4=0 then esc:=true else
with r^ do with ans(j) do begin
f1:=u1; f2:=u2; f3:=u3; f4:=u4;
if u1=1 then begin
lock r as d:dbuf do with d do begin
f5:=no; f6:=txti;
end;
if c='x' then begin u2:=7; signal(r,s(sl(u3))^) end 
else release(r);
end else begin
f5:=tab(u4); f6:='*'; release(r);
end;
l:=l-1; j:=j+1;
end;
until (l=0) or esc;
i:=i+1;
end;
'l': listq;
'(': begin x:=x+1; a(x):=i+1 end;
')': if x>0 then begin
if (line(i+1)>'1') and (line(i+1)<='9') then begin
line(i+1):=pred(line(i+1));  i:=a(x);
end else if line(i+1)='1' then i:=i+1;
x:=x-1;
end;
'c','d':
with data(line(i+1)) do begin
if c='d' then last:=8;
c:=line(i+2); i:=i+3;
while (line(i)<>c) and (line(i-1)<>nl) do begin
last:=last+1; inf(last):=line(i); i:=i+1;
end;
if line(i-1)=nl then i:=i-1;
end;
sp: ;
end;
end;
if c<>nl then i:=i+1;
until esc;
listq;
end;
until false;
end;

<*                                                      *>
<*                      end hdlcdata                    *>
<********************************************************>
\f


<*process s(var syst: system_vector);*>
const
hdlcsize=1000;
datasize=4000;
pri=-1;
datapri=0;
levq=24;
levr=26;

testmax=30;
opoolsize=10;

type
contype=record
xxx1,xxx2,xxx3:integer;
auto: boolean;
inf: array (2..5) of integer;
end;

telem=packed record
kind,t:integer;
a:byte;
nr:0..7;
p:bit;
ns:0..7;
i:bit;
s:packed array(0..15) of bit;
(* extended testoutput *********************************************
*)
b         : 0..4;
r,x       : 0..10;
y         : 0..2;
m         : bit;
jt        : 0..3;
vt,tnt    : 0..7;
t0t       : 0..31;
snd,sif,ab: bit;
(********************************************************************)
end;

testtype=record
first,last,next:integer;
d:array (0..testmax) of telem;
end;

txt=array (18..98) of char;
digtype=array (0..9) of char;
ciftype=array ('0'..'9') of byte;
mask= 0..63;

cline=record
f,l,n:integer;
name:alfa;
d:txt;
end;

modetype=packed record
test: mask;
func:0..3;
end;

modetab=array ('q'..'r') of modetype;

const
dig=digtype('0','1','2','3','4','5','6','7','8','9');
bool=digtype('.','1',8***'E');
cif=ciftype(0,1,2,3,4,5,6,7,8,9);
testoff=0;
teston=3;

var
mode,state: modetab:=modetab(2***modetype(teston,0));
ln:array (8..127) of char;
c:char;
m,r,con,out:reference;
etop,ecnt,v,i,n:integer:=0;
era,oque,cona,opool,a,outa:semaphore;
sem:array('q'..'r') of semaphore;
op:^semaphore;
cpool:pool 3 of cline;
conpool:pool 1 of contype;
opool1:pool opoolsize of testtype;
hpool: pool 5;
hdlcq,hdlcr,data: shadow;
err,finis,print,empty: boolean:=false;

procedure setmode=stvsb0(var r:byte; var s:modetype); external;
process hdlc(var sem:semaphore; reclev:integer); external;

procedure outi(var d:txt; var l:integer; t,n:integer);
var i:integer;
begin
for i:=n downto 1 do
if t>0 then begin d(l+i):=dig(t mod 10); t:=t div 10; end
else if i=n then d(l+n):='0' ;
l:=l+n;
end;

procedure testo(e:telem);
begin
wait(out,outa);
lock out as line:cline do with line do with e do begin
d:='  ';
l:=f-1; outi(d,l,t,4);
d(l+2):=c; d(l+3):=dig(kind);
case kind of
0:l:=f+24; 1:l:=f+18; 2:l:=f+6; 3:l:=f+12; otherwise l:=f+7 end;
outi(d,l,a,3);
d(l+2):=dig(nr); d(l+3):=dig(p); d(l+4):=dig(ns); d(l+5):=dig(i);
l:=f+33;
for v:=0 to 15 do d(l+v):=bool(s(v));
(* extended testoutput ***********************************************
*)
d(l+17):=dig(b); l:=l+18; outi(d,l,r,2); outi(d,l,x,3);
d(l+2):=dig(y); d(l+4):=dig(m); d(l+6):=dig(jt); d(l+8):=dig(vt);
d(l+10):=dig(tnt); l:=l+11; outi(d,l,t0t,3);
d(l+2):=dig(snd); d(l+3):=dig(sif); d(l+4):=dig(ab); l:=l-11;
(***********************************************************************)
l:=l+16; d(l):=nl;
end;
signal(out,op^);
end;

procedure list;
begin
if open(oque) or not nil(r) then
repeat
if nil(r) then wait(r,oque);
c:=ln(r^.u3);
lock r as td:testtype do with td do begin
i:=r^.u4;
if i>=next then begin
while (v<>0) and (i<=last) do begin
testo(d(i));  i:=i+1; v:=v-1;
end;
i:=first;
end;
while (v<>0) and (i<next) do begin
testo(d(i));  i:=i+1; v:=v-1;
end;
r^.u4:=i; empty:=(i=next);
end;
if empty then signal(r,opool);
until (v=0) or (passive(oque) and nil(r));
end;

<***********************************************************>
<*               hdlctest                                  *>
<*               initialize                                *>

begin
op:=syst(operatorsem);
i:=link('hdlc',hdlc);  if i<>0 then exception(40+i);

alloc(m,cpool,a);
lock m as h:cline do begin
m^.u1:=1; h.f:=18; h.l:=97; h.name:='test';
end;
signal(m,op^);

alloc(m,cpool,outa);
lock m as h:cline do begin
m^.u1:=2; h.f:=18; h.l:=18; h.name:='test';
h.d(18):=cr;
end;
signal(m,op^);

alloc(m,cpool,era);
lock m as h:cline do begin
m^.u1:=2; h.f:=18; h.l:=34; h.name:='test'; h.d:='***command error';
h.d(34):=nl;
end;
return(m);

repeat until open(outa);

repeat
trace(0);

if openpool(conpool) then alloc(con,conpool,cona);

while openpool(opool1) do begin
alloc(m,opool1,a); m^.u1:=44;  signal(m,opool);
end;

ln(levq):='q'; ln(levq+1):='q';
ln(levr):='r'; ln(levr+1):='r';

i:=create('hdlcq',hdlc(sem('q'),levq),hdlcq,hdlcsize);
if i<>0 then exception(50+i);

i:=create('hdlcr',hdlc(sem('r'),levr),hdlcr,hdlcsize);
if i<>0 then exception(50+i);

start(hdlcq,pri); start(hdlcr,pri);

i:=create('data',hdlcdata(op^,sem('q'),sem('r'),levq,levr),data,datasize);
if i<>0 then exception(50+i);
start(data,datapri);

repeat
wait(m,a);
if m^.u1=1 then begin <* console command *>
if m^.u2=0 then begin
lock m as l:cline do with l do begin
d(n):=nl;
case d(f) of
'm': begin <* set testmode *>
c:=d(f+1); mode(c).test:=testoff;
if((c<>'q') and (c<>'r')) or (d(f+2)<'0') or(d(f+2)>'3') then err:=true
else begin
mode(c).func:=cif(d(f+2));
i:=f+3; v:=0;
while (d(i)>='0') and (d(i)<='1') do begin
v:=v*2+cif(d(i)); i:=i+1;
if v>63 then d(i):=nl;
end;
if v>63 then err:=true else mode(c).test:=v;
end;
end;
'l': begin <* list testoutput *>
i:=f+1; v:=0;
while (d(i)>='0') and (d(i)<='9') do begin
v:=v*10+cif(d(i)); i:=i+1;
if v>3000 then d(i):=nl;
end;
if v>3000 then err:=true else begin
list;
print:=false;
end;
end;
'p': print:=true;
'c': begin <* connect *>
c:=d(f+1);  f:=f+2;
lock con as b:contype do with b do begin
auto:=true;
for i:=2 to 5 do begin
while ((d(f)<'0') or (d(f)>'9')) and (d(f)<>nl) do f:=f+1;
inf(i):=0;
while (d(f)>='0') and (d(f)<='9') do
if inf(i)>3000 then c:='a' else begin
inf(i):=inf(i)*10+cif(d(f));  f:=f+1;
end;
end;
end;
con^.u1:=4;  con^.u2:=7;
if (c='q') or (c='r') then begin
signal(con,sem(c));
wait(con,cona);
end else err:=true;
end;
'd': begin <* disconnect *>
con^.u1:=8;  con^.u2:=7;
if (d(f+1)='q') or (d(f+1)='r') then begin
signal(con,sem(d(f+1)));
wait(con,cona);
end else err:=true;
end;
'e': if ((d(f+1)='q') or(d(f+1)='r')) and (d(f+2)>='0') and (d(f+2)<='9')
then begin
etop:=cif(d(f+2));
while openpool(hpool) and (etop>ecnt) do begin
alloc(out,hpool,a);
out^.u1:=40; out^.u2:=7; signal(out,sem(d(f+1)));
ecnt:=ecnt+1;
end;
end else err:=true;
'f': finis:=(d(f+1)='i') and (d(f+2)='n');
nl : ;
otherwise
err:=true;
end;
f:=18;
end;
end;
signal(m,op^)
end else with m^ do
if u1=40 then begin <* event answer *>
wait(out,outa);
lock out as line: cline do with line do begin
c:=ln(u3); d:='event'; l:=f+8; d(f+6):=c; outi(d,l,m^.u2 div 8,2);
l:=l+1; d(l):=nl;
end;
signal(out,op^);
if etop<ecnt then begin ecnt:=ecnt-1; release(m) end else 
begin u2:=7; signal(m,sem(c)) end;
end else begin <* testoutput answ *>
if (u2=0) and (u4 <> 0) then begin
if (u4=2) and print then mode(ln(u3)).func:=2;
lock m as td:testtype do u4:=td.next;
signal(m,oque);
if print then list;
end else signal(m,opool);
end;
if err then begin
err:=false; wait(m,era); signal(m,op^);
end else
for c:='q' to 'r' do if mode(c)<>state(c) then
if open(opool) then begin
wait(m,opool);
setmode(m^.u3,mode(c)); m^.u4:=mode(c).func;  m^.u2:=7;
signal(m,sem(c));
mode(c).func:=0;  state(c):=mode(c);
end;
until finis;
stop(hdlcq); stop(hdlcr); stop(data);
remove(hdlcq); remove(hdlcr); remove(data);
finis:=false;
until false;
end
.
end-of-text *******************************************************
«eof»