417 lines
118 KiB
Plaintext
417 lines
118 KiB
Plaintext
StreamsandFileDevicesEdited30Nov84,vanMelleAnInterlispStreamisanobjectofdatatypeSTREAMthatiscapableofperforming,attheleast,sequentialinputand/oroutputofbytes.Somestreamscandomuchmore.Streamsareusedforaccesstoopenfiles,forwritingtothedisplay,forchattingtoremotehosts,andwhateverotherusespeoplecomeupwith.Thisdocumentdescribeshowonegoesaboutdefininganewdevice,themeaningsoftherecordfieldsoftheSTREAMandFDEVdatatypes,andanythingelsethatseemedrelevantatthetime.TheimplementationofStreamsisstronglyobject-oriented.EverySTREAMhasapointertoadevice(thedatatypeFDEV),whichcontainsavectoroffunctionstobecalledwhencertainoperationsarerequiredofthestream.Therecanbemanystreamswiththesamedevice.Intheobject-orientedtermsofLOOPS,onecanthinkofthedeviceasaclass,whichprovidesasetofmethodsthatimplementclassoperations,andthestreamsasinstances.Devicesandstreamsalsohavelocalstate,whichmightbethoughtofasclassandinstancevariables.DeclarationsforSTREAMandFDEVcanbeobtainedbyloadingEXPORTS.ALL.OPENSTREAM,CLOSEF,FORCEOUTPUT,READP,EOFP,GETEOFPTR,GETFILEINFO,SETFILEINFO,DIRECTORY,COPYBYTES,DELFILE,RENAMEFILE,FULLNAMEaresomeoftheLispfunctionscalledbytheprogrammerthatultimatelyturnintooperationsatthedevicelevel.Thedescriptionsthatfollowsometimesalludetothesefunctions,andknowledgeofhowtheyoperatemayoccasionallygivethereaderadditionalcluesastohowthedeviceoperationswork.Typically,somepartoftheoperationishandledbythe``generic''filesystemcode,whichthencallsonthedevicetohandlethatpartoftheoperationthatisdevice-specific.Forexample,thefunctionOPENFILEtakesthenameofthefileitistoopenandfillsinhostanddirectorydefaults,anddecideswhichdevicehandlessuchafile.Itthencallsontheparticulardevicetoactuallyopenthefile.Afterthefileisopened,thegenericfilesystemcoderegistersthefileon(OPENP).Asanotherexample,operationsinvolvingopenstreamsfirstcoercenon-streams(e.g.filenames)toopenstreamsbeforecallingthedevice-specificoperation.DevicesAdeviceisanobjectoftypeFDEV(sonamedforhistoricalreasons:``FileDevice'').Thestandardwaytodefineanewdeviceistocreatesuchanobject,byperforming(createFDEV--),andthenpassthenewlycreatedFDEVtothefunction\DEFINEDEVICE.\DEFINEDEVICEisthewayadevice``announces''itselftothegenericfilesystem.(\DEFINEDEVICENAMEDEV)[Function]InstallsdeviceDEV,givingitthenameNAME.NAMEmustbeanuppercaselitatom.Thegenericfilesystemcodemakesuseofthenametolocatethedevicethatiswillingtodealwithfileswhosefullnamebegins{NAME}.Itispermissibletohavemorethanonenamemaptothesamedevice;thiseffectivelyprovidesdevicesynonyms.Devicesareencouraged,however,toalwayscreatefilenamesusingthecanonicaldevicename,independentofwhatnamewaspassedin.NAMEcanbeNIL,inwhichcasethegenericfilesystemcodeneverconsultsthedevicedirectly.However,itsEVENTFNisstillrunaroundLispexits,anditcanbeusedasthedeviceforastreamcreatedbynonstandardmethods.
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<EFBFBD>q?<3F>`<60> 2Ifadeviceneverwantstobeinvokedbyname,andhasnointerestingEVENTFNorHOSTNAMEPmethods,thenthereisnoneedtoeverregisteritwith\DEFINEDEVICE.(\REMOVEDEVICEDEV)[Function]RemovesdeviceDEVfromthelistofknowndevices,aswellasanynamethatmapstothatdevice.(\GETDEVICEFROMNAMENAMENOERRORDONTCREATE)[Function]ReturnsthedeviceassociatedwithNAME.NAMEcanbealitatomorstring;itiscoercedtouppercase,andifitbeginswithanopenbrace,isassumedtobeafilename,fromwhichthehostnameisextracted.Ifnosuchdeviceisknown,attemptstofindonebypollingtheHOSTNAMEPmethodsofallknowndevices(seebelow);ifadeviceisstillnotfound,causesaFILENOTFOUNDerrorunlessNOERRORistrue.IfDONTCREATEistrue,itneverattemptstocreateadevice,justreturnsanexistingdeviceifthereisone,NILotherwise.ThefieldsofanFDEVaredividedupintoinformationalfieldsand``methods''.DEVICENAMEApointerfield,thenameofthedevice,standardlyalitatom.Useofthisfieldislargelyuptothedevice,butitisusuallyselectedtobethenamethatappearsinsidebracesinfilenamesopenedonthisdevice.Fordevicesthatdonotsupportthenotionofnamedfiles,DEVICENAMEcanbeanythingthattheimplementorcarestousefordebuggingassistance.RESETABLEAflag,trueif(SETFILEPTRstream0)canbeperformed.Currentlyunused.RANDOMACCESSPTrueifthestreamisrandomlyaccessable,i.e.,ifSETFILEPTRworksonthiskindofstream.NODIRECTORIESTrueiffilesopenedonthisdevicedonot(usually)haveadirectoryaspartoftheirname.TheprincipaluseforthisisbytheCONNcommand,whichwillnottrytoconnecttotheuser'shomedirectoryifgivenahostonly,e.g.,CONN{DSK}.BUFFEREDTrueifstreamsofthissortarebufferedinamannercompatiblewiththemicrocodedversionsofBINandBOUT.Morespecifically,BUFFEREDimpliesthatthedeviceimplementstheGETNEXTBUFFERmethod.Seedescriptionofbufferedstreams.PAGEMAPPEDTrueifthisstreamisimplementedbythepagemappedfunctions.Allpagemappedstreamsarealsobuffered,soifthisflagistrue,soshouldbeBUFFERED.Seedescriptionofpagemappedstreams.FDBINABLETrueifstreamsonthisdeviceobeytherulesformicrocodedBINwheneversuchstreamisopenforinputaccess.FDBOUTABLETrueifstreamsonthisdeviceobeytherulesformicrocodedBOUTwheneversuchstreamisopenforoutputaccess.Currentlyunused,asthespecneedsrevision.FDEXTENDABLESpecialkindofFDBOUTABLE.Currentlyunused,asthespecneedsrevision.DEVICEINFOApointertoarbitrarydevice-specificinformation.Thestandarduseforthisistoholdlocalstatespecifictooneofseveralsimilardevicesthatsharemethods.Forexample, <00>$ <0B>
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<EFBFBD>q?<3F>`<60> 3theDolphindiskprovidesaseparateFDEVforeachpartitionofthemachine;theDEVICEINFOfieldofeachhaspointerstothepartition'sdirectoryandotherinformationspecifictofilesonthatpartitiononly.Thefollowingfieldsareallpointerfields,andcontainfunctionsforimplementingvariousdeviceoperations.Notalldevicesneedhaveallfieldsfilledin;therequiredonesarelistedfirstandsoindicated.Some``required''fieldshavedefaultsspecifiedintheFDEV(orSTREAM)recorddeclaration,sotheimplementorneednotexplicitlyfillthosefieldsifthedefaultisreasonable.Eachfieldispresentedwithitsarguments,inthestyleofafunctiondefinition;ofcourse,itisthecontentsofthefield,notthefieldname,thatisthefunction.Usingobject-orientedterminology,theoccupantsofthesefieldsarereferredtoas``methods''.Forexample,``theBINmethod''means``thefunctionthatoccupiestheBINfield''.Oneoftheargumentstoeachmethodisusuallyeitherthedeviceitself,orastreamopenonthedevice,sothatthedevice(andhenceitsDEVICEINFO)isusuallyaccessibletoallthesefunctions.Argumentsthatarefilenamesorpatternsorpiecesoffilenamescanbeeitherlitatomsorstrings,andalreadyhavetheirhostand/ordirectorypartsappropriatelyfilledinfromtheconnecteddirectorydefaults.Thedevicemayassumethatthehostfieldofthefilenameisindeedanamethatthedevicehassaiditimplements(seeHOSTNAMEP).``Full''filenamesreturnedbythesefunctions(orstoredintheFULLFILENAMEfieldofastream)shouldbelitatoms,andatleastinthecurrentimplementationshouldbealluppercase.Fieldsrequiredofeverydevice:(HOSTNAMEPHOSTNAMEDEVICE)Calledbythegenericfilesystemcodewhenpresentedwithahostnameforwhichthereisasyetnodevicedefined.Thefunctionshouldreturnnon-NILifit``recognizes''HOSTNAME.Therearetwowaysinwhichthismethodisinvoked:(1)ToobtainadeviceforHOSTNAME,forexample,sothatafilecanbeopenedonit.Inthiscase,DEVICEisanalreadydefineddevice(theonewhoseHOSTNAMEPmethodisbeingcalled),andthefunctionshouldreturneitheranewdevice,orT,meaningitiswillingtotakeresponsibilityforthishostnameaswellasanypreviousnameunderwhichthedevicewasregistered.Ineithercase,thecallerwillinstallthereturneddevice,orDEVICEifvaluewasT,asthedevicetowhichHOSTNAMEmaps.(2)Asapurepredicate.Inthiscase,DEVICEisNIL,andthefunctionneedonlyreturnTorNIL,indicatingwhetheritbelievesthatHOSTNAMEisthenameofahost.Inpractice,theHOSTNAMEPmethodneedonlytakecareofthefirstcase,sincethatalsotakescareofthesecondcase.Thesecondcaseisprovidedsothatthedeviceneednotbecreateduntilthereisanactualuseforit,shouldthedevicewishtoavoidunnecessarywork.Inpracticeitisrarethatanyonetestsahostnamewithoutsubsequentlyneedingtohavethedevicecreatedinfull.TherearebasicallythreekindsofdevicesinthesystemasdistinguishedbytheirHOSTNAMEPmethods.(1)Predefineddeviceswithexactlyonename,orstrictlyinternaldeviceswithnonotionofname.Forexample,theCOREdevicealwaysexists,andhasexactlyonename;theSPPdevice(anetworkbytestream)hasnoname(itsupportsnofilesdirectly).SuchdeviceshaveaHOSTNAMEPmethodofNILLtheonlynametheyevergobyistheonetheygaveto\DEFINEDEVICE,ifany.Thisisthedefault. <00>J<EFBFBD><4A>
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<EFBFBD>q?<3F>`<60> 4(2)Devicesthatdon'tknowaheadoftimewhattheirnamewillbe,butforwhichtheremightbemanyincarnations.Thisisthemodelforremotefileservers.ThestandardwayofhandlingthiscaseistodefineadummydevicethathasonlyaHOSTNAMEPmethod,andnoname.WhentheHOSTNAMEPmethodgetscalledwithanamethatthedeviceknowsitcanservice,itcreatesadevicebythatname.Ifgivenanamethatisasynonymofanothername,itmightjustreturntheexistingdeviceofthecanonicalname(using\GETDEVICEFROMNAMEtofindtherightdevice).Ineithercase,theHOSTNAMEPmethodofthenewdeviceisusuallyNILLtheoriginaldeviceistheonlyonethatworriesaboutcreatingnewinstancesofthisclassofdevice.(3)Like(2),butallthedifferentnamesarehandledbyasingledevice,whichtakescareinternallyofthemultiplexingamong,say,differentremotehosts.HOSTNAMEPreturnsTinthiscase.Thisisusuallyclumsierthan(3),sodiscouraged.(EVENTFNDEVICEEVENT)CalledaroundLispexits,toallowthedevicetodoanynecessarycleaningup,clearingofcaches,disconnectswithremotehosts,etc.EVENTisoneofthefollowinglitatoms:BEFORELOGOUT,BEFORESYSOUT,BEFOREMAKESYS,BEFORESAVEVM,AFTERLOGOUT,AFTERSYSOUT,AFTERMAKESYS,AFTERSAVEVM,AFTERDOSYSOUT,AFTERDOMAKESYS,AFTERDOSAVEVM.TheAFTERxxxeventsareallrunwhenLispisbootedfromamemoryimagethatresultedfromaLOGOUT,SYSOUT,etc.TheAFTERDOxxxeventsrunwhencontinuingLispinthesameincarnationfollowingtheSYSOUT,etc.(thereisnosucheventforLOGOUT,ofcourse).The``after''eventsarecalledinthesameorderinwhichthedevicesweredefined;the``before''eventsinthereverseorder.Forexample,theBEFORELOGOUTeventfortheLeafremotefileserverdevicesperformsaFORCEOUTPUTonallitsopenfilesandthenbreakstheconnectionwiththefileserver.TheAFTERxxxeventsfortheLeafdevicescalls\REMOVEDEVICEonitselftoflushanyconnectionbetweenthenameandtheserver(sincenamesandaddressescanchangeoverexit).TheAFTERxxxeventsfortheDoradodiskdevicerebuildsitscacheofthedisk'sdirectory.ThereareafewdevicesinthesystemthatexistonlyfortheirEVENTFN.Inmostcases,asimplerwaytotellthesystemyouwantsomethingperformedaroundexitistoaddyoureventfunctiontothelistAROUNDEXITFNSinsteadofgoingtotheexpenseofdefiningadeviceforit.Thereisyetanotherlist,\SYSTEMCACHEVARS,forhandlingamorespecialized``aroundexit''operation:everytimeLispisbooted,eachofthevariablesinthelist\SYSTEMCACHEVARSissettoNIL.Thefollowingarerequiredofallnameddevices,thatis,devicesthatmapfromsomehostnametothedevice,uponwhichfilesmightbeopenedorotherwisemanipulated:(DIRECTORYNAMEPHOST/DIRDEVICE)TrueifHOST/DIRisavaliddirectorynameonDEVICE.Functionshouldideallyperformrecognitionaswell,andreturnthe``true''name.Forexample,given``{PHYLEX:}<LISP>''asargument,itmightreturn{Phylex:PARC:Xerox}<Lisp>.HOST/DIRmightincludeasubdirectoryname.Thedeviceshouldattempttotellthetruthaboutwhetherthesubdirectoryexistsornot,thoughthismaynotbepossiblefordeviceswithfakesubdirectories.DefaultstoNILL,i.e.,devicesupportsnodirectories.UsedbythecommandCONNandthefunctionDIRECTORYNAMEP.(OPENFILENAMEACCESSRECOGPARAMETERSDEVICE) <00>.<2E><> <0C><>
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<EFBFBD>q?<3F>`<60><07> 6Exceptionhandling:Ifthedesiredfileisnotfound,theOPENFILEmethodshouldreturnNILratherthancauseaFILENOTFOUNDerror.Thisissothatthegenericfilesystemcodecancausetheerrorusingtheoriginalfilename,nottheonepackedwithhostanddirectorypassedintotheOPENFILEmethod.Thedeviceshouldfeelfreetosignalanyothererrorsitselfonfailingtoopenthefile,e.g.,FILEWON'TOPENforabusyfile,PROTECTIONERROR,orFILESYSTEMRESOURCESEXCEEDED.Ideally,thiserrorshouldbesignaledinawaythatisresumable,i.e.,sothatausercould,inthebreak,takesomeactiontoremedytheconditionandthentypeOKtocontinue.InmostcasesitsufficesthatalltheinternalfunctionsbelowtheOPENFILEbenamedwithbackslashes,sothattheerrorcodewillchoosetoresumebyrevertingtotheOPENFILEandtryingagain.Thedevicedoesnotneedtoknowaboutthesetofopenfiles(i.e.,thevalueof(OPENP)),andingeneralshouldignoreit.Thatis,thedeviceshouldperformtheopenasiftherewerenootherfilesopenandhencenoconflict.ThegenericfilesystemcodelooksatthestreamreturnedfromtheOPENFILEmethodandthenworriesaboutwhetherthereisactuallyanotherstreamopenbythesamename.Ifthereis,itclosesthenewlyopenedstreamandtheneitherreturnsthepre-existingstream,orcausesaFILEWON'TOPENerrorifthenewandoldaccessmodesareinconflict.Thisdesigniscrufty,butIbelieveitstemsprincipallyfromtherecognitionproblemyoudon'tknowthefullnameofafileuntilyouopenit,soyoucan'ttelluntilthenwhetheryoushouldhavetriedtoopenitinthefirstplace.Itwill,ofcourse,havetobecompletelychangedwhenwegotomultiplestreamsperfile.(REOPENFILENAMEACCESSRECOGPARAMETERSDEVICEOLDSTREAM)ThisisexactlylikeOPENFILE,exceptthatitiscalledafterLOGOUT(orother``after''events)onthenameofanystreamthatwasleftopenoverexit.TheideaistomaintaintheillusionthatthefilereallywasopenoverLOGOUT,butcheckandmakesurenothingchanged.ThegenericfilesystemcodeusestheVALIDATIONfieldtotestwhetherthefilechangedbehindyourback.OLDSTREAMisthestreamthatwasopenbeforeexit,andissuppliedforthebenefitofdeviceswherethereisnopossibilitythatthefilechanged(e.g.,{CORE}),sothattheycanjustreturnOLDSTREAMdirectly.OLDSTREAMisalsoofuseforthosedevicesthathavetocheatinordertomaintaintheillusion.Thiswillhavetochangewhenwegotomultiplestreamsperfile.(GETFILENAMENAMERECOGDEVICE)Performs``recognition''onNAME.Thatis,itreturnsthefullnameofthefilethatwouldbeopenedbyOPENFILEintheindicatedrecognitionmode,orNILifthefileisnotfound.ItisnotnecessarythatOPENFILEactuallybecapableofopeningthefile(thereisnoneedtocheckprotection,forexample).UsedbyINFILEP,OUTFILEP,FULLNAME.(DELETEFILENAMEDEVICE)DeletesthefilenamedNAME,returningitsfullnameonsuccess,NILonfailure.RecognitionmodeisimplicitlyOLDEST.Localdevices,afterrecognizingthefile,shouldmakesurethatitisnotOPENP(openfilescannotbedeleted).ThisandRENAMEFILEareusuallytheonlydevicemethodsthatneedtoknowanythingaboutwhatfilesareopen.(GENERATEFILESDEVICEPATTERNDESIREDPROPSOPTIONS)EnumeratesfilesmatchingPATTERN.Returnsa``filegeneratorobject''oftheform(NEXTFILEFNINFOFN.ArbitraryState).ThisisdescribedinmoregorydetailunderDirectoryEnumeration. <00>/0<>
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<EFBFBD>q?<3F>`<60> 7(RENAMEFILEOLDNAMENEWNAMEDEVICE)RenamesthefilenamedOLDNAMEtohavenameNEWNAME.Returnsthefullnameofthenewfileifsuccessful,NILifnot.RecognitionmodeisimplicitlyOLDforOLDNAME,NEWforNEWNAME.ThegenericfilesystemcodeinvokesthismethodtoimplementthefunctionRENAMEFILEonlywhenthehostfieldsofbothfilenamesmaptothesamedevice.Defaultsto\GENERIC.RENAMEFILE,whichisalsothefunctionthatthesystemcallswhentheoldandnewnamesareondifferentdevices.\GENERIC.RENAMEFILEisdefinedtocopyOLDNAMEtoNEWNAMEandthendeleteOLDNAME.Thefollowingmethodsareinvokedforopenstreams.Theyareallrequired:(BINSTREAM)ReturnsthenextbyteofinputfromSTREAM,ortakestheappropriateactionifatendoffile.Unlessadevicehasagoodreasonnotto,itshouldcall(\EOF.ACTIONSTREAM)atendoffile/stream.ThedeviceBINmethodisactuallynotuseddirectly.Rather,everystreamhasaSTRMBINFNfield,whichisthefunctionactuallyappliedtodotheinput.TheSTRMBINFNfieldcouldthusbeusedtofakeaspecializationofthedevicedifferingonlyintheBINmethod.However,thetypicaluseofSTRMBINFNistotemporarilyoverridethedevicedefault.Inparticular,settingastream'saccesstoINPUTorBOTHautomaticallysetsthestream'sSTRMBINFNtobethedevice'sBINmethod;settingaccesstoNILorOUTPUTsetstheSTRMBINFNtobeanerror.Thisrelievesthedevice'sBINmethodofanyneedtocheckthestream'saccessoneverycalltoBIN.SomenetworkstreamstemporarilysettheirSTRMBINFNtobeaninputeaterwhentheyreceivea``clearoutput''command.Currently,allInterlisp-Dstreamshavebytesize8,soBINalwaysreturnsan8-bitinteger.CallstothefunctionBINarecompiledintotheBINopcode,whichrunsinmicrocodeonsomemachinesiftherequirementsforitaremet.Moreonthislater.(BOUTSTREAMBYTE)OutputsBYTEtoSTREAM.AswithBIN,thismethodisnotuseddirectly.Rather,everystreamhasaSTRMBOUTFNfield,whichisthefunctionactuallyappliedtodotheoutput.Settingastream'saccesstoOUTPUTorBOTHautomaticallysetsthestream'sSTRMBOUTFNtobethedevice'sBOUTmethod.ThereexistsaBOUTopcode,butthedesignisincomplete.(PEEKBINSTREAMNOERRORFLG)ReturnsthenextinputbytefromSTREAM,butdoesnotadvancethestreampointer.ThusasubsequentPEEKBINorBINwillreturnthesamebyte.Atendofstream,thedeviceshouldtakeeofactionaswithBIN,unlessNOERRORFLGistrue,inwhichcaseitshouldreturnNIL.(READPSTREAMFLG)ReturnstrueifinputisavailablefromSTREAM,thatis,ifaBINrightnowwouldsucceedwithoutwaiting.Defaultsto\GENERIC.READP,whichusesEOFPandPEEKBIN. <00>E<EFBFBD><45>
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<EFBFBD>q?<3F>`<60>, 8Roughlyspeaking,READPisthecomplementofEOFPforstreamsthatarenotarrivinginrealtime.Itisinterestinglydifferentfornetworkstreams,orthekeyboard.FLGisabitofcruftthatnoteveryonepaysattentionto,andmaybeflushedatsomepoint:ifFLGisNIL,thenREADPshouldreturnNILiftheonlyinputwaitingisanendoflinecharacter.(EOFPSTREAM)ReturnstruewhenSTREAMis``atendoffile'',i.e.,aBINwouldcauseanendoffileactiontooccur.Notethatforanetworkstream,itispossibleforbothEOFPandREADPtobefalsesimultaneously,viz.whenthereisnoinputwaiting(bufferedlocally),buttheremoteendofthestreamhasnotindicatedthatthereisnomoreinput.TherearesomewhocallEOFPonstreamsopenonlyforoutput.Thisisacrock;outputstreamsarealwaysatendoffile.Buttoavoidcomplaints,adevicecouldreturnTforEOFPonanoutputstream.(BLOCKINSTREAMBUFFERBYTEOFFSETNBYTES)Performsbulkinputtransfer:retrievesthenextNBYTESbytesfromSTREAMandstorestheminsuccessivebytepositionsinBUFFERstartingatBYTEOFFSET.Defaultsto\GENERIC.BINS,whichrepeatedlycallsBINand\PUTBASEBYTE.Itisalmostalwaysthecasethatadevicewithanon-trivialBLOCKINmethodcanbemadetobeaBuffereddevice,therebybenefitingfromotherBufferedoperationsaswell.(BLOCKOUTSTREAMBUFFERBYTEOFFSETNBYTES)Performsbulkoutputtransfer:outputsNBYTESbytestoSTREAM,takingthebytesfromBUFFERstartingatBYTEOFFSET.Defaultsto\GENERIC.BOUTS,whichrepeatedlycalls\GETBASEBYTEandBOUT.(FORCEOUTPUTSTREAMWAITFORFINISH)ForcestoitsultimatedestinationanyoutputbufferedonSTREAMbutnotyetsent.WAITFORFINISHmeansthatthefunctionshouldnotreturnuntilitisconfidentthattheoutputhasreacheditsdestinationandbeencommitted.DefaultstoNILL,whichisreasonableforunbufferedstreams.Forexample,foranetworkstream,FORCEOUTPUTsendsthecurrentpacketbeingbufferedup.Forabufferedstreamtothedisk,FORCEOUTPUTwritesouttothediskany``dirty''pages,andmakessurethefileisinsuchastatethatifthemachinewerebootedafterFORCEOUTPUTreturns,thatthefilecouldbesuccessfullyreopenedwithnoinformationlost.(GETFILEINFONAME/STREAMATTRIBUTEDEVICE)ReturnsthevalueofthespecifiedATTRIBUTEofNAME/STREAM,whichcanbeanopenStreamorthenameofa(closed)file.ReturnsNILforattributesitdoesn'tknowabout.Itisconsideredgoodcitizenship,thoughnotabsolutelyrequired,toknowaboutthefollowingattributes:LENGTHLengthofthestream/fileinbytes.Ifthedevice'smethodreturnsNIL,butthestreamisrandomaccess,thegenericGETFILEINFOcodetriesthedevice'sGETEOFPTRmethodinstead.SIZELengthinpages,i.e.,(FOLDHIlengthBYTESPERPAGE). <00><J<>
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<EFBFBD>q?<3F>`<60><06> 9CREATIONDATEDatewhenthefile'scontentswerecreated,asastring.Thecreationdatedoesnotchangewhenafileiscopiedorrenamed,onlywhenitischanged.WRITEDATEDatewhenthefilewaswrittentoitscurrentplaceofstorage.READDATEDatewhenthefilewaslastread.ICREATIONDATE,IWRITEDATE,IREADDATEThecreation,writeandreaddatesasintegers,suchasfromthefunctionIDATE.TYPETypeofthecontents:TEXTforfilesthatcontainonly``text''(generallymeaning7-bitascii),BINARYforallothers.NILmeansunknown.AUTHORNameoftheuserwhocreatedthefile(astring).Thefollowing``generic''attributesaregenerallyhandledbythegenericsideofGETFILEINFOifthedevice'sGETFILEINFOmethodreturnsNIL:EOLTheendoflineconventionofthestream(CR,CRLForLF).BUFFERSThenumberofpagemapbuffersforusebythestream(seedescriptionofMAXBUFFERSfieldofpagemappedstreams).ENDOFSTREAMOPActiontotakeonanyattempttoreadbeyondtheendoffile.Thisisafunctionofoneargument,thestream.Thefunctioncancauseanerror,orreturnavalue,whichisinterpretedasavaluetoreturnfromBIN.ThedefaultENDOFSTREAMOPcausesanENDOFFILEerror.ACCESSAnatomdescribingtheaccessmodeofthestream(INPUT,OUTPUT,etc).Thisissogenericthatitishandledbeforethedevice'smethodeverseesit.BYTESIZE,OPENBYTESIZEThesizeofbytestransmittedonthestream.Always8thesedays.(SETFILEINFONAME/STREAMATTRIBUTEVALUEDEVICE)SetsthevalueofthespecifiedATTRIBUTEofNAME/STREAMtobeVALUE.ReturnsTifsuccessful,NILifunsuccessful,orforattributesitdoesn'tknowabout.ItisnotgenerallyrequiredthatSETFILEINFOrecognizeanyattributesatallNILLisaperfectlygoodfillerforthisslot.MostdevicesrecognizenomorethanTYPEandCREATIONDATE(ICREATIONDATE),andeventhosearenotveryimportant,asmostapplicationssetthoseattributesinthePARAMETERSargumenttoOPENFILEwhencreatingafile.ATTRIBUTE=LENGTHimpliesactuallytruncating(orlengthening)thefile;however,theSETFILEINFOneednothandlethisitselfifitreturnsNIL,thenthegenericfilesystemwillattempttousetheSETEOFPTRmethodinstead.Thefollowingoperationsareonlyrequiredofrandomaccessstreams.Theydefaulttothefunction\IS.NOT.RANDACCESSP,whichcausesa``Streamisnotrandaccessp''errorwhencalled.(GETFILEPTRSTREAM)Returnsthecurrentfilepointer(byteposition)inSTREAM.Thefilepointeriszerowhenthestreamisopened(exceptforACCESS=APPEND),andisincrementedbyoneforeachbyteread. <00>@<40><>
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<EFBFBD>q?<3F>`<60>7 10Althoughthisoperationisonlyabsolutelyrequiredforrandomaccessstreams,itisdesirabletosupplyitforotherstreamswherepossible.Forexample,whenreadingafilesequentiallythroughPupFtp,thestreamcancountthebytesastheygobyandthusgiveanaccuratevalueforGETFILEPTR.Ifastreamhasnoideaatallofposition,itcanmakeitsGETFILEPTRbethefunctionZEROandtherebyatleastavoidbreaksfromcodethatcallsGETFILEPTRcarelessly.(GETEOFPTRSTREAM)ReturnsthefilepointeroftheendofSTREAM,i.e.,thefilepointerthatGETFILEPTRwouldreturnafterthelastbyteofSTREAMisread.SameastheLENGTHattributeforastreamthatrepresentsafile.Ofcourse,non-randomaccessstreamsmayhavenoideawheretheendis,andcausinganon-randaccessperrorisperfectlyacceptable.(SETFILEPTRSTREAMBYTENUMBER)SetsthefilepointerofSTREAMtobeBYTENUMBER.ThespecialvalueBYTENUMBER=<3D>1meanstheendofthestream;othernegativevaluesareillegal.SETFILEPTRbeyondtheendofthestreamispermissible,butithasnoimmediateeffectbeyondchangingthelogicalfilepointer.AttemptingtothenBINcausesanEOFerror.AttemptingtoBOUT(forafileopenforwrite)shouldextendthefile,sothatitseofisimmediatelybeyondthenewlyBOUTedbyte.AswithGETFILEPTR,thereisnorequirementthatthisworkonnon-randomaccessstreams,anditmaybecompletelyimpossibleonsomeofthem.However,forthosenon-randomaccessstreamsthatperformGETFILEPTR,itispossibletofakeSETFILEPTRforvalueslargerthanthecurrentfilepointerbyskippingsomenumberofbytesinthefile,e.g.,byperforming(RPTQ(DIFFERENCEBYTENUMBER(GETFILEPTRSTREAM))(BINSTREAM)).TherearesomeapplicationsforwhichforwardSETFILEPTRisalltherandomaccessthatisactuallyrequired,soitisnicetobeabletoaccommodatesuchapplications.(BACKFILEPTRSTREAM)BacksupthefilepointerinSTREAMbyonebyte.Functionallythesameas(SETFILEPTRSTREAM(SUB1(GETFILEPTRSTREAM)),butmaybepossibleonnon-randomaccessstreamsbymaintainingaone-characterbuffer,whichisallthebackingupthisoperationisformallyrequiredtoperform.IbelievethemainuseforthisisinREAD,whichneedstobackupthestreamonecharacterwhen,forexample,itreadsabreakcharacterterminatinganatom.(SETEOFPTRSTREAMLENGTH)ChangesthelengthofSTREAMtobeLENGTH,i.e.,``sets''itsendoffilepointer.Thismayrequirelengtheningortruncatingthefile.Usedbythefunction\SETEOFPTRandbySETFILEINFOforattributeLENGTHwhenthedevice'sSETFILEINFOmethoddoesn'thandleit.Thefollowingthreefieldsareplaceholdersforpossiblefutureextensions.Thesefieldsarenotcurrentlyusedatall:(LASTCSTREAM)ReturnsthelastcharacterreadfromSTREAM,i.e.,thelastbytethatwasBINed,asacharacter.LASTCiscurrentlyimplementedviaBACKFILEPTR. <00>H<EFBFBD><48>
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<EFBFBD>q?<3F>`<60><05> 12ACCESSAccessfieldforreferringtotheACCESSBITSfieldsymbolically.ItsvalueisoneofthelegalvaluesoftheACCESSargumenttoOPENFILE:INPUT,OUTPUT,BOTH,APPEND;orNILwhenthestreamisclosed.ReplacingthisfieldhasthesideeffectofsettingtheBINABLE,BOUTABLE,STRMBINFNandSTRMBOUTFNfieldsappropriately(fromthecorrespondingdevicefields,ortovaluesconsistentwithnoaccess).USERCLOSEABLEFlag,trueifthestreamcanbeclosedbyCLOSEF.DefaultisT,butisNILforsuchthingsasdribblefilesandtheterminal.USERVISIBLEFlag,trueifthestreamistobelistedintheresultof(OPENP).DefaultisT,butisNILforsuchthingsasdribblefilesandtheterminal.BINABLETrueifBINmicrocodecanbeused.NormallysetautomaticallyfromFDBINABLEwheninputaccessisset.BOUTABLETrueifBOUTmicrocodecanbeused.NormallysetautomaticallyfromFDBOUTABLEwhenoutputaccessisset.EXTENDABLETrueifBOUTcanextendthebufferwhenCOFFSETreachesCBUFSIZE.Obsolete.STRMBINFNFunctioncalledbyBIN.ThisisnormallysetindirectlyasasideeffectofsettingtheACCESSfield.SettingACCESStoaninputaccess(INPUTorBOTH)setstheSTRMBINFNtobethestream'sdevice'sBINmethod.SettingtoanyotheraccesssetstheSTRMBINFNtobea``filenotopen''trap.STRMBOUTFNFunctioncalledbyBOUT.AswithSTRMBINFN,thisisnormallysetindirectly(fromthedevice'sBOUTmethod)asasideeffectofsettingtheACCESSfield.OUTCHARFNFunctioncalledtooutputasinglebyte.ThisislikeSTRMBOUTFN,exceptforbeingonelevelhigher:itisintendedfortextoutput.Hence,thisfunctionshouldconvert(CHARCODEEOL)intothestream'sactualendoflinesequence,andshouldadjustCHARPOSITIONappropriatelybeforeinvokingthestream'sSTRMBOUTFNtoactuallyputthecharacter.Defaultsto\FILEOUTCHARFN.TheOUTCHARFNforthedisplayadditionallyworriesaboutsuchthingsasECHOCONTROL.CHARPOSITIONCurrenthorizontalcharacterpositioninthestream.Incremented(andresettozero)byOUTCHARFN.UsedbythefunctionPOSITION.LINELENGTHMaximumlinelengthofthestream,incharacters.UsedbythefunctionLINELENGTH.Defaults(atcreationtime)tothevalueoftheglobalvariableFILELINELENGTH.EOLCONVENTIONThestream'sendoflineconvention:themannerinwhich``endofline''isencodedonthisstream.Thatis,outputofanendofline(functionTERPRI)producesthestream'sendoflinesequence,andoninput,thestream'sendoflinesequenceisconvertedto(CHARCODEEOL)byREADC.Thisisnotnecessarilythesameasthewaythatendoflineisencodedintheactualfilewrittenby,say,afileserver.Forexample,LispmightopenastreamtoaTenexfileserverwithEOLCONVENTIONofCR,whiletheservermightchoosetotakeeachoftheCRsinthestreamandactuallystoreaCR,LFsequenceinthephysicalfile. <00>><3E><>
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<EFBFBD>q?<3F>`<60>6 13Theconventionisencodedasatwo-bitfield;theconstantsCR.EOLC,LF.EOLC,CRLF.EOLCcanbeusedtorefertothecurrentlyknownvaluessymbolically.DefaultinInterlisp-DisCR.EOLC.ENDOFSTREAMOPFunctionofoneargument(thestream)calledwhenanattempttoreadbeyondtheendoffileoccurs.Ifthisfunctionreturnssomething,itshouldbeinterpretedasavaluetoreturnfromBIN(thevalueTiscurrentlyprohibited).Defaultsto\EOSERROR,whichcausesanENDOFFILEerror.VALIDATIONPointerfield,somecompactencodingofthestateofthefilesuchthatifthefile'scontentchanges,theVALIDATIONchanges.Thefile'sICREATIONDATEattributeusuallyworkswellenough.TheonlyuseforthisfieldistocheckwhetherthefilechangedoverLOGOUT,etc.iftheVALIDATIONofthestreamreturnedfromREOPENFILEisEQUALtotheVALIDATIONofthestreamopenbeforeLOGOUT,thestreamisassumedtobeunchnaged.Thiswillprobablybethesoleconcernofthedevicewhenwegotomultiplestreamsperfile.BYTESIZEBytesizeofthefile,i.e.,whatBINandBOUTtrafficin.Defaultsto8.Thisfieldisnotusedbymany;thereareprobablyalotofthingsthatwon'tworkifthebytesizeisnot8.OTHERPROPSListinpropertylistformatusedbythefunctionSTREAMPROP.AnalogoustoWINDOWPROP,etc.IMAGEOPSImageoperationsvector(objectoftypeIMAGEOPS)foruseofdevice-independentgraphicsoperations,suchasDSPXPOSITION,DSPFONT.Defaultsto\NOIMAGEOPS,avectorsuitablydefinedfornon-displaydevices.Seetheimplementors'manualchapterDevice-IndependentGraphics.IMAGEDATADevice-dependentdataforusebyIMAGEOPS.REVALIDATEFLGFlag.Thestandarduseofthisflagistosolveaproblemwithcorrectlymaintainingthecreationdate.Theproblemisthatthedefinitionof``creationdate''isthatthecreationdatechangeswheneverthecontentsofthefilechange.Iffollowedliterally,thiswouldmean,forexample,thatevertimeyouwroteoutapageofa{DSK}file,youwouldalsohavetorewriteitsleaderpagewithanewcreationdate.However,itsufficesinpracticetoonlychangethecreationdatewhenitwouldmatter,i.e.,whentherewouldbeanypossibilityofsomeagentotherthanthecurrentlyrunningLisptoseethechange.Usually,thismeanstheonlytimetoworryaboutiswhentheLispvmemissavedandafilethatwasopenbeforethesaveiswrittentoagainafterwards.Thus,theuseofthisflag(forthosedevicesthatcare)isasfollows:thedevice'sBEFORExxxeventssetthisflagtrueforanystreamsopenonthedevice.Then,wheneverthedeviceisabouttodosomethingthatwouldchangethefile'scontent,e.g.,writeoutanewpage,itfirsttestsREVALIDATEFLG.Iftheflagistrue,itupdatesthefile'screationdateandclearstheflag.NONDEFAULTDATEFLGFlag.StandarduseisinconjunctionwithREVALIDATEFLG,tomarkafilethatwasopenedinawaythattheuserconstrainedthecreationdateofthefile(e.g.,thePARAMETERSargumenttoOPENFILEincludedanexplicitcreationdate,ortheoptionDON'T.CHANGE.DATE). <00>":<3A> <0C><>
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<EFBFBD>q?<3F>`<60>h 15whateverisnecessarytoallowtheoperationtoproceed.Thistypicallyincludesdisposingofthecurrentbuffersomehow(ifGETNEXTBUFFERwasinvokedbecausethebufferwasexhausted),andfetchinganewbufferconsistentwithSTREAM'scurrentposition.InthecaseofWHATFOR=READ,GETNEXTBUFFERreturnsTonsuccess,i.e.,ifSTREAMisnotatendoffile.WhenSTREAMisatendoffile,GETNEXTBUFFERshouldtakestandardendofstreamaction,returningwhatever\EOF.ACTIONreturns(ifanything).However,ifNOERRORFLGistrue,GETNEXTBUFFERshouldjustreturnNILimmediately.(RELEASEBUFFERSTREAMBUFFER)[Devicemethod]Performsanydevice-specificoperationrequiredwhenBUFFER,whichisthecurrentvalueofSTREAM'sCBUFPTRfield,is``released''(whentheCBUFPTRfieldisreplaced).Thisisusedsothatdifferentpagemap-likedevicescansharecertaincode.Forexample,inthecaseofpagemappedstreams,RELEASEBUFFERmarksthebufferdirtyinthecasethatthestream'sCBUFDIRTYfieldhasbeenset.Thismethodisnotcurrentlyused.Thefunctions\BUFFERED.BIN,\BUFFERED.PEEKBIN,\BUFFERED.BOUT,\BUFFERED.BINSand\BUFFERED.BOUTSaresuppliedforusebybufferedstreams;theyarestandardlyusedtoimplementtheBIN,PEEKBIN,BOUT,BLOCKINandBLOCKOUTdevicemethods.Inaddition,thefunctionCOPYBYTES,whenpresentedwithasourcestreamthatisbuffered,utilizestheGETNEXTBUFFERmethodtoefficientlycopybytestothedestinationabuffer-fullatatime.PagemappedStreamsPagemappedstreamsareaparticularkindofrandomaccessBufferedstreamthatbuffersitsdatainunitsofpages.Thedeviceprovidesmethodsthatreadorwritedatainunitsofpages,whilesystem-suppliedPagemappedfunctionshandletheresponsibilitiesofaBufferedstream,aswellasmanagingthefilepointerforrandomaccess.Ingeneral,astreamcanhaveseveralpagesofafilebufferedatatime,allowingthecodetomakesomeefforttomakeefficientuseofmulti-pagedtransferswhereapplicable.Tocreateapagemappeddevice,createanFDEV,fillinthenecessaryprivatefields,thencallthefollowingfunction:(\MAKE.PMAP.DEVICEDEVICE)[Function]Fillsinfieldsinthedeviceappropriateforpagemappeddevices,andreturnstheupdateddevice.ThefieldsitfillsaretheflagfieldsFDBINABLE,FDBOUTABLE,RESETABLE,RANDOMACCESSP,PAGEMAPPED,BUFFERED(alltrue),andthemethodsBIN,BOUT,PEEKBIN,BLOCKIN,BLOCKOUT,READP,EOFP,GETFILEPTR,BACKFILEPTR,SETFILEPTR,GETEOFPTR,SETEOFPTR,GETNEXTBUFFERandFORCEOUTPUT.APagemappeddeviceisrequiredtosupplythefollowingmethods(inadditiontothoserequiredofalldevicesandnotfilledinby\MAKE.PMAP.DEVICE):(READPAGESSTREAMFIRSTPAGE#BUFFERS)[Devicemethod]CausespagesofSTREAMtobereadintoBUFFERS.ThefirstpagereadisFIRSTPAGE#(zeroforthefirstpageofthefile).BUFFERSiseitherasinglepage-sizedbuffer(aVMEMPAGEP),inwhichcase <00>J<EFBFBD><4A>
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16exactlyonepageisread,oritisalistofsuchbuffers.READPAGESreturnsthetotalnumberofbytesread.Ifthelastpagereadisnotafullpage,READPAGESshouldzeroouttherestofitsbuffer.READPAGEScanassumethatthebuffersarepage-aligned,althoughtheyneednotbeconsecutive.(WRITEPAGESSTREAMFIRSTPAGE#BUFFERS)[Devicemethod]WritesdatafromBUFFERSouttoSTREAM.ThefirstpagewrittenisFIRSTPAGE#.BUFFERSisaswithREADPAGES.NeitherREADPAGESnorWRITEPAGESaffectsSTREAM'sfilepointerorendoffile;thosearemanagedbyhigher-levelpagemappedroutines.WRITEPAGESmight,however,wanttolookatSTREAM'sEPAGEandEOFFSETfieldsifitneedstotakeanyspecialactionaroundtheendofthefile.Itispossible,fornoparticularlygoodreason,forREADPAGEStogetcalledforapagebeyondtheendoffile;infact,thisstandardlyhappenswhenwritinganewfile.TheREADPAGESmethodinthiscaseshouldjustclearthebufferandreturnzero.(TRUNCATEFILESTREAMPAGE#OFFSET)[Devicemethod]TruncatesSTREAMsothatitsendoffileisPAGE#,OFFSET,whichshouldbedefaultedtoSTREAM'sEPAGEandEOFFSET.Canbeusedtoeithershortenorlengthenafile;iflengthening,thefileshouldbepaddedwithnulls.Usedby\PAGED.SETEOFPTRand\PAGED.FORCEOUTPUT.Asofthiswritingtherearestillbugsinthiscodeincertainfunnycases,suchaswhenyouSETFILEPTRbeyondeofandthenBOUT.Thefollowingfieldsofastreamaremeaningfulforapagemappeddevice.Thegenericpagemappedcodesmaintainthemasoperationsonthefileareperformed,buttheyshouldallbeinitializedappropriatelybythedevice'sOPENFILEmethod:CPAGEForpagemappedstreams,thecurrentpagepositioninthestream.TogetherwithCOFFSET,thisconstitutesthestream'sfilepointer.Thedevice'sOPENFILEmethodshouldsetCPAGEandCOFFSETtozero,exceptforfilesopenedwithaccessAPPEND,inwhichcasetheyshouldbesettotheendoffile.EPAGE,EOFFSETForpagemappedfiles,thepageandbyteoffsetoftheendoffile.Notethatthisisthelogicalendofthefile;itneedhavenothingtodowiththephysicalendoffile,exceptthatwhenafileisclosed,thedeviceshouldseetoitthatitslogicalandphysicalEOFsarethesame(normallyseentobytheTRUNCATEFILEinsideof\CLEARMAP,below).Infact,asatypicalfileisbeingwritten,EPAGEtendstostayseveralpagesaheadofthephysicalendoffilebyvirtueofthefactthatpagesarebeingbufferedbeforebeingwrittenout.BUFFSForpagemappedstreams,apointertothestream'sBUFFERchain.InitiallyNIL(nobuffersallocated).Thedeviceusuallyhasnodirectinterestinthisfield.MAXBUFFERSForpagemappedstreams,themaximumnumberofbuffersdesiredinthestream'sBUFFSchain.IfthecodeneedsanotherbufferandtherearealreadyMAXBUFFERSbuffers,itwilltrytorecycletheleastrecentlyreferencedbuffer.Defaultsto\STREAM.DEFAULT.MAXBUFFERS.TheusercanchangethisfieldforanopenstreambycallingSETFILEINFOwithattributeBUFFERS. <00>J<EFBFBD><4A> <0F>
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<EFBFBD>q?<3F>`<60>- 17MULTIBUFFERHINTFlag.Forpagemappedstreams,isahinttothepagemapcodethatthedevicepreferstotransferdatamorethanonebufferatatime.Ifthisflagistrue,thepagemapcodetriestowriteout(WRITEPAGES)morethanonebufferatatimewhentheopportunityarises.Asimilarimprovementisplanned,butnotimplemented,forreadingmultiplebuffersatatime.Thefollowingfunctionsareofuseforpagemappeddevices:(\PAGED.FORCEOUTPUTSTREAMWAITFORFINISH)[Function]ThisfunctionimplementstheFORCEOUTPUTmethodforpagemappedstreams:itcausesanydirtypagestobewrittenout(usingWRITEPAGES),thencallstheTRUNCATEFILEmethodtosettheendoffile.ThisfunctionisnormallyinstalledastheFORCEOUTPUTmethodbythefunction\MAKE.PMAP.DEVICE.However,thedevicecanoverridethisdefault(bysupplyingitsownfunctioninthatfield),inwhichcaseitmightwanttocallthefunction\PAGED.FORCEOUTPUTexplicitlyaspartofitsmorecomprehensiveFORCEOUTPUTmethod.Thereisanunpleasantnessintheimplementationofpagemappeddevicesthatstemsfromthefactthatoriginallyalldevices(thefewthatexistedinthedistantpast)weremadetosupportthePMAPpackage,ameanswherebyaprogrammercouldgetdirectaccesstothebuffersofafile,muchasonecanwiththePMAPJSYSinTenex.Asaresult,thebuffersusedbypagemappedstreamsaresetupinaspecialmannersothatthegarbagecollectorcantellwhentheusernolongerhasaccesstoaPMAPbuffer.ThePMAPpackageisbeingphasedout.Thisisallexceedinglycrufty,andisoflittleconcerntothedeviceimplementer,exceptforthefactthatitrequiresthatthebuffersbeexplicitlyreleasedwhenastreamisclosed;thebuffersarenotautomaticallycollectedwhenthestreamisdropped.(FORGETPAGESSTREAMFROMPAGETOPAGE)[Function]``Forgets''pagesFROMPAGEthruTOPAGEofSTREAM;i.e.,removesthosepagesfromthesetofpagesbeingcurrentlybuffered,andfreesthebufferstheywereoccupying.IfFROMPAGE=TOPAGE=NIL,forgetsallpages,andreleasesallofSTREAM'sbuffers.(\CLEARMAPSTREAM)[Function]PerformsaFORCEOUTPUT(ifSTREAMisopenforoutput)followedbyaFORGETPAGES.Thisisthestandardactionthatshouldbetakenbyapagemappedstream'sCLOSEFILEmethod.DirectoryEnumerationThissectiondescribeshowdirectoryenumerationworkswhatyouneedtoknowinordertoimplementtheGENERATEFILESdevicemethod,andwhatyouneedtoknowasaprogrammertryingtoenumerateadirectoryviaanythingmoreelaboratethanthefunctionDIRECTORY.Thegeneralideaisthatthedirectoryenumerationcodeisgivenapattern,anditreturnsageneratorthat,eachtimeitispoked,returnsanotherfilenamematchingthepattern.Inaddition,thegeneratorprovidesahandleforgettingfileattributesofeachenumeratedfile.Thissecondhandleisimportantforefficiency:although <00>9<EFBFBD><39> 1<>
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<EFBFBD>q?<3F>`<60> 19versionifitenumeratesinsortedorderandusesperhapsalittlelookaheadtoassurethatanynameitreturnsistheoneofhighestversion.(NEXTFILEFNGENFILESTATENAMEONLY)[FileGeneratorComponent]Generatesthenextfile,returningitsnameasastring,orNILifthegeneratorisexhausted.GENFILESTATEisthestatecomponentofthefilegeneratorreturnedfromGENERATEFILES.NAMEONLYmeansthatthecallerisonlyinterestedinthefile'sName.Extfields,notthefullfilename(andnomorethanoneversionofthefileneedbeenumerated);however,itisalwayspermissibletoreturnthefullfilename.TheNAMEONLYoptionisusedbySPELLFILE.(FILEINFOFNGENFILESTATEATTRIBUTE)[FileGeneratorComponent]ReturnsthevalueoftheATTRIBUTEpropertyofthefilemostrecentlygeneratedbytheNEXTFILEFN,i.e.,effectively(GETFILEINFOlatest-nameATTRIBUTE),buthopefullymuchfaster.ATTRIBUTEmusthavebeenamemberoftheDESIREDPROPSargumenttoGENERATEFILES.Notalldeviceimplementorsareenthusedaboutimplementingapatternmatcherforfilenames.Thefollowingfunctionsareprovidedtohelpout:(DIRECTORY.MATCH.SETUPPATTERN)[Function]AcceptsasPATTERNafilenamestringsuchaspassedtoGENERATEFILES.ReturnsanobjectsuitableasafiltertoDIRECTORY.MATCH.(DIRECTORY.MATCHFILTERTESTNAME)[Function]MatchesTESTNAME,afilename,againstFILTER,theobjectreturnedfromDIRECTORY.MATCH.SETUP.ReturnstrueifTESTNAMEmatchesthepattern,falseifnot.Thematchiscase-insensitive.(\NULLFILEGENERATOR)[Function]Returnsafilegeneratorthatproducesnofiles.(\GENERATENOFILESDEVICEPATTERNDESIREDPROPSOPTIONS)[Function]Returnsa``stupid''filegeneratorfordevicesthatdon'tknowhowtoenumerateingeneral.IfPATTERNcontainsnowildcards,butnamesafilethatisINFILEP,thenthegeneratorproducesexactlythatfile.IfPATTERNcontainsawildcardintheversionfield,itusesGETFILENAMEtolaboriouslygeneratealltheversionsofthefile.Inallothercases,\GENERATENOFILESreturnsanullfilegenerator.Informationforclientsofdeviceenumeration.Thefollowingfunctionsmakeupthe``public''interfacetodirectoryenumeration:(\GENERATEFILESPATTERNDESIREDPROPSOPTIONS)[Function]ReturnsafilegeneratorobjectforenumeratingthefilesmatchingPATTERN.PATTERNisexpandedbyaddingthedefaulthostand/ordirectoryifappropriate.SeedescriptionoftheGENERATEFILESmethodfordescriptionofDESIREDPROPSandOPTIONS. <00>J<EFBFBD><4A> R<>
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<EFBFBD>q?<3F>`<60><05> 20(\GENERATENEXTFILEGENERATORNAMEONLY)[Function]Returnsthenextfile,asastring.GENERATORistheobjectreturnedfrom\GENERATEFILES;NAMEONLYindicatescallerdoesnotrequirethatthefullnamebereturned,butthatthenameandextensionaresufficient.(\GENERATEFILEINFOGENERATORATTRIBUTE)[Function]ReturnsthevalueoftheATTRIBUTEpropertyofthefilemostrecentlygeneratedby\GENERATENEXTFILE,i.e.,effectively(GETFILEINFOlatest-nameATTRIBUTE).ATTRIBUTEmusthavebeenamemberoftheDESIREDPROPSargumentto\GENERATEFILES.(DIRECTORY.FILL.PATTERNPATTERNDEFAULTEXTDEFAULTVERS)[Function]ThisfunctionisusedtofillindefaultsinPATTERNbeforepassingitto\GENERATEFILES.IfPATTERNdoesnotincludeanextensionorversion,butthosefieldsarenotexplicitlyomitted(e.g.,``FOO'',butnot``FOO.'';``FOO.BAR'',butnot``FOO.BAR;''),theyarefilledinwithDEFAULTEXTandDEFAULTVERS,whichthemselvesdefaultto``*''.ThisfunctionisusedbytheDIRcommand,andshouldprobablybeusedbyanycodethattakesauser-suppliedpatternandenumeratesfilesfromit. <00><<3C><> <02>
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|
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<EFBFBD>q?<3F>`<60><02>
|
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<01>
|
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TIMESROMAN
|
||
<01> HELVETICA <01>
|
||
TIMESROMAN <01> HELVETICA
|
||
<01>
|
||
TIMESROMAN <01>
|
||
TIMESROMAN
|
||
~GACHA
|
||
<01>
|
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TIMESROMAN <01>
|
||
TIMESROMAN
|
||
<01>
|
||
TIMESROMAN ~GACHA
|
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j
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^
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<00> <00> 4 <00> <00> <00> <00> E <00> O j/ <00> <00> <01><><EFBFBD>ןg <01><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> {DSK3}STREAMS.TEDIT;23 VANMELLE 30-Nov-84 14:17:38 |