PACKET dirDEFINES opendir,insertdirentry,deletedirentry,initdirds,fileinfo,
formatdir,dirlist,fileexists,subdirexists,allfiles,allsubdirs:LET 
maxdirentrys=1000;INITFLAG VAR dirblockdsused:=FALSE ;DATASPACE VAR 
dirblockds;BOUND STRUCT (ALIGN dummy,ROW 64REAL daten)VAR dirblock;REAL VAR 
lastreaddirblockno;PROC initdirblockio:lastreaddirblockno:=-1.0;IF NOT 
initialized(dirblockdsused)THEN dirblockds:=nilspace;dirblock:=dirblockdsFI .
END PROC initdirblockio;PROC readdirblock(REAL CONST blocknr):IF 
lastreaddirblockno<>blocknrTHEN lastreaddirblockno:=-1.0;
readdiskblockandcloseworkiferror(dirblockds,2,blocknr);lastreaddirblockno:=
blocknrFI .END PROC readdirblock;PROC writedirblock(REAL CONST blocknr):
writediskblockandcloseworkiferror(dirblockds,2,blocknr);lastreaddirblockno:=
blocknr.END PROC writedirblock;PROC writedirblock:IF lastreaddirblockno<0.0
THEN errorstop("Lesefehler")FI ;writedirblock(lastreaddirblockno)END PROC 
writedirblock;PROC getdirentry(TEXT VAR entrybuffer,INT CONST blockentryno):
entrybuffer:=32*".";INT CONST replaceoffset:=4*blockentryno;replace(
entrybuffer,1,dirblock.daten[replaceoffset+1]);replace(entrybuffer,2,dirblock
.daten[replaceoffset+2]);replace(entrybuffer,3,dirblock.daten[replaceoffset+3
]);replace(entrybuffer,4,dirblock.daten[replaceoffset+4]).END PROC 
getdirentry;PROC putdirentry(TEXT CONST entrybuffer,INT CONST blockentryno):
INT CONST offset:=4*blockentryno;dirblock.daten[offset+1]:=entrybufferRSUB 1;
dirblock.daten[offset+2]:=entrybufferRSUB 2;dirblock.daten[offset+3]:=
entrybufferRSUB 3;dirblock.daten[offset+4]:=entrybufferRSUB 4.END PROC 
putdirentry;LET DIRPOS =REAL ;DIRPOS PROC dirpos(REAL CONST blocknr,INT 
CONST entrynr):blocknr*16.0+real(entrynr).END PROC dirpos;REAL PROC blockno(
DIRPOS CONST p):floor(p/16.0)END PROC blockno;INT PROC entryno(DIRPOS CONST p
):int(pMOD 16.0)END PROC entryno;PROC incr(DIRPOS VAR p):pINCR 1.0.END PROC 
incr;LET FREELIST =STRUCT (ROW maxdirentrysDIRPOS stack,INT stacktop,DIRPOS 
beginoffreearea,endofdir,REAL dirroot);PROC initfreelist(FREELIST VAR flist,
REAL CONST root):flist.stacktop:=0;flist.beginoffreearea:=dirpos(9.0e99,0);
flist.endofdir:=dirpos(-1.0,0);flist.dirroot:=root.END PROC initfreelist;
PROC store(FREELIST VAR flist,DIRPOS CONST freepos):flist.stacktopINCR 1;
flist.stack[flist.stacktop]:=freepos.END PROC store;PROC storebeginoffreearea
(FREELIST VAR flist,DIRPOS CONST begin):flist.beginoffreearea:=beginEND PROC 
storebeginoffreearea;PROC storeendofdir(FREELIST VAR flist,DIRPOS CONST end):
flist.endofdir:=endEND PROC storeendofdir;DIRPOS PROC freedirpos(FREELIST 
VAR flist):enablestop;DIRPOS VAR result;IF flist.stacktop>0THEN popELIF NOT 
freeareaemptyTHEN firstoffreeareaELIF expansionallowededTHEN 
allocatenewdircluster;result:=freedirpos(flist)ELSE errorstop(
"Directory voll")FI ;result.pop:result:=flist.stack[flist.stacktop];flist.
stacktopDECR 1.freeareaempty:flist.beginoffreearea>flist.endofdir.
firstoffreearea:result:=flist.beginoffreearea;incr(flist.beginoffreearea).
expansionalloweded:flist.dirroot>=2.0.allocatenewdircluster:REAL CONST 
newdircluster:=availablefatentry;REAL VAR lastentryno;
searchlastentrynooffatchain;fatentry(newdircluster,lastfatchainentry);
fatentry(lastentryno,newdircluster);writefat;storebeginoffreearea(flist,
dirpos(firstnewblock,0));storeendofdir(flist,dirpos(lastnewblock,15));
initnewdircluster.searchlastentrynooffatchain:lastentryno:=flist.dirroot;
WHILE NOT islastfatchainentry(fatentry(lastentryno))REP lastentryno:=fatentry
(lastentryno)PER .firstnewblock:beginofcluster(newdircluster).lastnewblock:
beginofcluster(newdircluster)+real(sectorspercluster-1).initnewdircluster:
TEXT CONST emptydirentry:=32*"�";INT VAR i;FOR iFROM 0UPTO 15REP putdirentry(
emptydirentry,i)PER ;disablestop;REAL VAR blockno:=firstnewblock;WHILE 
blockno<=lastnewblockREP writedirblock(blockno)PER .END PROC freedirpos;LET 
FILEENTRY =STRUCT (TEXT dateandtime,REAL size,firstcluster,DIRPOS dirpos),
FILELIST =STRUCT (THESAURUS thes,ROW maxdirentrysFILEENTRY entry);PROC 
initfilelist(FILELIST VAR flist):flist.thes:=emptythesaurus.END PROC 
initfilelist;PROC storefileentry(FILELIST VAR flist,TEXT CONST entrytext,
DIRPOS CONST position):INT VAR entryindex;insert(flist.thes,filename,
entryindex);storefileentry(flist.entry[entryindex],entrytext,position).
filename:TEXT CONST namepre:=compress(subtext(entrytext,1,8)),namepost:=
compress(subtext(entrytext,9,11));IF namepost<>""THEN namepre+"."+namepost
ELSE namepreFI .END PROC storefileentry;PROC storefileentry(FILEENTRY VAR 
fentry,TEXT CONST entrytext,DIRPOS CONST position):fentry.firstcluster:=real(
entrytextISUB 14);fentry.dateandtime:=dosdate+"  "+dostime;fentry.size:=dint(
entrytextISUB 15,entrytextISUB 16);fentry.dirpos:=position.dosdate:day+"."+
month+"."+year.day:text2(code(entrytextSUB 25)MOD 32).month:text2(code(
entrytextSUB 25)DIV 32+8*(code(entrytextSUB 26)MOD 2)).year:text(80+code(
entrytextSUB 26)DIV 2,2).dostime:hour+":"+minute.hour:text2(code(entrytext
SUB 24)DIV 8).minute:text2(code(entrytextSUB 23)DIV 32+8*(code(entrytextSUB 
24)MOD 8)).END PROC storefileentry;TEXT PROC text2(INT CONST intvalue):IF 
intvalue<10THEN "0"+text(intvalue)ELSE text(intvalue)FI .END PROC text2;
DIRPOS PROC fileentrypos(FILELIST CONST flist,TEXT CONST filename):INT CONST 
linkindex:=link(flist.thes,filename);IF linkindex=0THEN errorstop(
"Die Datei """+filename+""" gibt es nicht")FI ;flist.entry[linkindex].dirpos.
END PROC fileentrypos;PROC delete(FILELIST VAR flist,TEXT CONST filename):
INT VAR dummy;delete(flist.thes,filename,dummy).END PROC delete;PROC fileinfo
(FILELIST CONST flist,TEXT CONST filename,REAL VAR firstclusterno,storage):
INT CONST linkindex:=link(flist.thes,filename);IF linkindex=0THEN errorstop(
"Die Datei """+filename+""" gibt es nicht")FI ;firstclusterno:=flist.entry[
linkindex].firstcluster;storage:=flist.entry[linkindex].sizeEND PROC fileinfo
;BOOL PROC contains(FILELIST VAR flist,TEXT CONST filename):flist.thes
CONTAINS filenameEND PROC contains;PROC list(FILE VAR f,FILELIST CONST flist)
:INT VAR index:=0;TEXT VAR name;get(flist.thes,name,index);WHILE index>0REP 
listfile;get(flist.thes,name,index)PER .listfile:write(f,centeredname);write(
f,"  ");write(f,text(flist.entry[index].size,11,0));write(f,
" Bytes belegt      ");write(f,flist.entry[index].dateandtime);write(f,
"  +++  ");write(f,text(flist.entry[index].firstcluster));line(f).
centeredname:INT VAR pointpos:=pos(name,".");IF pointpos>0THEN namepre+"."+
namepostELSE text(name,12)FI .namepre:text(subtext(name,1,pointpos-1),8).
namepost:text(subtext(name,pointpos+1,pointpos+4),3).END PROC list;LET 
DIRENTRY =REAL ,DIRLIST =STRUCT (THESAURUS thes,ROW maxdirentrysDIRENTRY 
entry);PROC initdirlist(DIRLIST VAR dlist):dlist.thes:=emptythesaurus.END 
PROC initdirlist;PROC storesubdirentry(DIRLIST VAR dlist,TEXT CONST entrytext
):INT VAR entryindex;insert(dlist.thes,subdirname,entryindex);dlist.entry[
entryindex]:=real(entrytextISUB 14).subdirname:TEXT CONST namepre:=compress(
subtext(entrytext,1,8)),namepost:=compress(subtext(entrytext,9,11));IF 
namepost<>""THEN namepre+"."+namepostELSE namepreFI .END PROC 
storesubdirentry;REAL PROC firstclusterofsubdir(DIRLIST CONST dlist,TEXT 
CONST name):INT CONST linkindex:=link(dlist.thes,name);IF linkindex=0THEN 
errorstop("Das Unterverzeichnis """+name+""" gibt es nicht")FI ;dlist.entry[
linkindex].END PROC firstclusterofsubdir;BOOL PROC contains(DIRLIST CONST 
dlist,TEXT CONST subdirname):dlist.thesCONTAINS subdirnameEND PROC contains;
PROC list(FILE VAR f,DIRLIST CONST dlist):INT VAR index:=0;TEXT VAR name;get(
dlist.thes,name,index);WHILE index>0REP listdir;get(dlist.thes,name,index)
PER .listdir:write(f,centeredname);write(f,"   <DIR>");write(f,"  +++  ");
write(f,text(dlist.entry[index]));line(f).centeredname:INT VAR pointpos:=pos(
name,".");IF pointpos>0THEN namepre+"."+namepostELSE text(name,12)FI .namepre
:text(subtext(name,1,pointpos-1),8).namepost:text(subtext(name,pointpos+1,
pointpos+4),3).END PROC list;LET DIR =BOUND STRUCT (FILELIST filelist,
DIRLIST dirlist,FREELIST freelist,TEXT path);DIR VAR dir;DATASPACE VAR dirds;
INITFLAG VAR dirdsused:=FALSE ;PROC opendir(TEXT CONST pathstring):
initdirblockio;initdirds;dir.path:=pathstring;loadmaindir;TEXT VAR restpath:=
pathstring;WHILE restpath<>""REP TEXT CONST subdirname:=nextsubdirname(
restpath);loadsubdirPER .loadmaindir:initfilelist(dir.filelist);initdirlist(
dir.dirlist);initfreelist(dir.freelist,0.0);storeendofdir(dir.freelist,dirpos
(lastmaindirsector,15));BOOL VAR waslastdirsector:=FALSE ;REAL VAR blockno:=
firstmaindirsector;INT VAR i;FOR iFROM 1UPTO dirsectorsREP loaddirblock(
blockno,waslastdirsector);blocknoINCR 1.0UNTIL waslastdirsectorPER .
firstmaindirsector:real(beginofdir).lastmaindirsector:real(beginofdir+
dirsectors-1).loadsubdir:REAL VAR clusterno:=firstclusterofsubdir(dir.dirlist
,subdirname);waslastdirsector:=FALSE ;initfilelist(dir.filelist);initdirlist(
dir.dirlist);initfreelist(dir.freelist,clusterno);WHILE NOT 
islastfatchainentry(clusterno)REP loadsubdirentrysofcluster;clusterno:=
fatentry(clusterno)UNTIL waslastdirsectorPER .loadsubdirentrysofcluster:
storeendofdir(dir.freelist,dirpos(lastblocknoofcluster,15));blockno:=
beginofcluster(clusterno);FOR iFROM 1UPTO sectorsperclusterREP loaddirblock(
blockno,waslastdirsector);blocknoINCR 1.0UNTIL waslastdirsectorPER .
lastblocknoofcluster:beginofcluster(clusterno)+real(sectorspercluster-1).END 
PROC opendir;PROC loaddirblock(REAL CONST blockno,BOOL VAR waslastblock):
waslastblock:=FALSE ;readdirblock(blockno);INT VAR entryno;TEXT VAR entry;
FOR entrynoFROM 0UPTO 15REP getdirentry(entry,entryno);processentryUNTIL 
waslastblockPER .processentry:SELECT pos("�.�",entrySUB 1)OF CASE 1:
endofdirsearchCASE 2:CASE 3:freeentryOTHERWISE 
volumelabelorfileentryorsubdirentryEND SELECT .endofdirsearch:waslastblock:=
TRUE ;storebeginoffreearea(dir.freelist,dirpos(blockno,entryno)).freeentry:
store(dir.freelist,dirpos(blockno,entryno)).
volumelabelorfileentryorsubdirentry:INT CONST byte11:=code(entrySUB 12);IF (
byte11AND 8)>0THEN ELIF (byte11AND 16)>0THEN subdirentryELSE fileentryFI .
subdirentry:storesubdirentry(dir.dirlist,entry).fileentry:storefileentry(dir.
filelist,entry,dirpos(blockno,entryno)).END PROC loaddirblock;TEXT PROC 
nextsubdirname(TEXT VAR pathstring):TEXT VAR subdirname;IF (pathstringSUB 1)
<>"\"THEN errorstop("ungültige Pfadbezeichnung")FI ;INT CONST backslashpos:=
pos(pathstring,"\",2);IF backslashpos=0THEN subdirname:=subtext(pathstring,2)
;pathstring:=""ELSE subdirname:=subtext(pathstring,2,backslashpos-1);
pathstring:=subtext(pathstring,backslashpos)FI ;dosname(subdirname,readmodus)
.END PROC nextsubdirname;PROC initdirds:IF initialized(dirdsused)THEN forget(
dirds)FI ;dirds:=nilspace;dir:=dirds.END PROC initdirds;PROC insertdirentry(
TEXT CONST name,REAL CONST startcluster,storage):DIRPOS CONST inspos:=
freedirpos(dir.freelist);TEXT CONST entrystring:=entryname+" "+(10*"�")+
dostime+dosdate+entrystartcluster+entrystorage;writeentryondisk;
writeentryindirds.entryname:INT CONST pointpos:=pos(name,".");IF pointpos>0
THEN subtext(name,1,pointpos-1)+(9-pointpos)*" "+subtext(name,pointpos+1)+(3-
LENGTH name+pointpos)*" "ELSE name+(11-LENGTH name)*" "FI .dostime:TEXT 
CONST akttime:=timeofday(clock(1));code((minuteMOD 8)*32)+code(8*hour+minute
DIV 8).hour:int(subtext(akttime,1,2)).minute:int(subtext(akttime,4,5)).
dosdate:TEXT CONST aktdate:=date(clock(1));code(32*(monthMOD 8)+day)+code((
year-80)*2+monthDIV 8).day:int(subtext(aktdate,1,2)).month:int(subtext(
aktdate,4,5)).year:int(subtext(aktdate,7,8)).entrystartcluster:TEXT VAR 
buffer2:="12";replace(buffer2,1,lowword(startcluster));buffer2.entrystorage:
TEXT VAR buffer4:="1234";replace(buffer4,1,lowword(storage));replace(buffer4,
2,highword(storage));buffer4.writeentryondisk:readdirblock(blockno(inspos));
putdirentry(entrystring,entryno(inspos));writedirblock.writeentryindirds:
storefileentry(dir.filelist,entrystring,inspos).END PROC insertdirentry;PROC 
deletedirentry(TEXT CONST name):TEXT VAR entry;DIRPOS CONST delpos:=
fileentrypos(dir.filelist,name);readdirblock(blockno(delpos));getdirentry(
entry,entryno(delpos));putdirentry("�"+subtext(entry,2,32),entryno(delpos));
writedirblock;delete(dir.filelist,name);store(dir.freelist,delpos).END PROC 
deletedirentry;PROC formatdir:initdirblockio;initdirds;buildemptydirblock;
REAL VAR blockno:=real(beginofdir);disablestop;FOR iFROM 1UPTO dirsectorsREP 
writedirblock(blockno);blocknoINCR 1.0PER ;enablestop;dir.path:="";
initfilelist(dir.filelist);initdirlist(dir.dirlist);initfreelist(dir.freelist
,0.0);storebeginoffreearea(dir.freelist,dirpos(real(beginofdir),0));
storeendofdir(dir.freelist,dirpos(lastmaindirsector,15)).buildemptydirblock:
INT VAR i;FOR iFROM 0UPTO 15REP putdirentry(32*"�",i)PER .lastmaindirsector:
real(beginofdir+dirsectors-1).END PROC formatdir;PROC fileinfo(TEXT CONST 
filename,REAL VAR startcluster,size):fileinfo(dir.filelist,filename,
startcluster,size)END PROC fileinfo;THESAURUS PROC allfiles:THESAURUS VAR t:=
dir.filelist.thes;tEND PROC allfiles;THESAURUS PROC allsubdirs:dir.dirlist.
thesEND PROC allsubdirs;BOOL PROC fileexists(TEXT CONST filename):contains(
dir.filelist,filename)END PROC fileexists;BOOL PROC subdirexists(TEXT CONST 
subdirname):contains(dir.dirlist,subdirname)END PROC subdirexists;PROC 
dirlist(DATASPACE VAR ds):openlistfile;headline(listfile,listfilehead);list(
listfile,dir.filelist);list(listfile,dir.dirlist).openlistfile:forget(ds);ds
:=nilspace;FILE VAR listfile:=sequentialfile(output,ds);putline(listfile,"").
listfilehead:"DOS"+pathstring.pathstring:IF dir.path<>""THEN "     PATH: "+
dir.pathELSE ""FI .END PROC dirlist;END PACKET dir;