;
;	File:		PrintGlue.a
;
;	Contains:	This code is the printing glue for 128K ROM printing
;
;	Copyright:	© 1985-1993 by Apple Computer, Inc.  All rights reserved.
;
;	Change History (most recent first):
;
;	   <SM4>	 6/28/93	kc		Roll in Ludwig.
;	   <LW2>	 6/25/93	fau		(with mal and chp):  If the PDEF is 32 bytes or less, go flush
;									the cache, in case the developer is using the PDEF as a stub and
;									stuffing their own code.
;	   <SM3>	 11/5/92	SWC		Changed PrEqu.a->Printing.a and
;									PrintCallsEqu.a->PrintTrapsEqu.a.
;		<SM1>	 6/15/92	CSS		Take out forRom and CubeE conditionals because the forRomed code is old
;									and this is CubeE.  The net effect of which is to make printing work
;									on SuperMario!!!!!
;		<17>	12/16/91	IH		Fix 1018177 in theFuture. Search for symbol "PURGEALIAS".  Do
;									not release the print driver alias and make it non-purgable
;									before calling ResolveAlias.
;		<16>	11/27/91	DTY		Don’t save LastSPExtra around _HOpenResFile any more now that
;									_HOpenResFile checks to see if the font caches should be
;									flushed.
;		<15>	 10/4/91	gbm		#1013134,#1013156: Work around a case where the font caches
;									would get flushed repeatedly during printing
;		<14>	  3/6/91	NB		Bug: NB-3. Reviewed by csd. An earlier fix to error handling
;									caused the error to not be overwritten if it was already set.
;									However, since PrOpen doesn't reset the error to noErr at
;									startup, any printing error that stays in low-mem after closing
;									the printing manager prevents subsequent printing calls. Now
;									PrOpen (actually PrOpenDrvr) will reset the error to noErr
;									before opening the driver.
;		<13>	  3/5/91	PN		Fix the warning by putting back the END statement at the end
;		<12>	  3/1/91	NB		If the resource for the alias is not found, then we would
;									normally return resNotFound. The glue used to return fnfErr
;									whenever it couldn't open the driver and applications have coded
;									for that error. Rather than add an error code, we map
;									resNotFound to fnfErr and save the user some grief. We also put
;									PrError into D0 at exit. This is needed because PrLoadDriver
;									returns the error in D0.
;		<11>	 2/21/91	NB		Bug: NB-2. Reviewed by dba. Fixed a bug in PrLoadDriver in which
;									it was overwriting the error. This would occasionally cause a
;									cancel request from the user (iUsrAbort) to be replaced with
;									noErr. Now it preserves the error if the error is already set.
;		<10>	  8/9/90	CCH		Added System 6 print glue back in, conditionalized for ROM only.
;		 <8>	  8/1/90	gbm		fix Darin “BoneHead” Adler’s “optimization”
;		 <7>	 7/23/90	dba		change this into a linked patch
;		 <6>	 7/20/90	gbm		get rid of the warning
;		 <5>	 5/18/90	PP		Pass address of “fromFile” correctly to ResolveAlias call.
;		 <4>	 4/17/90	NB		Removed GetResource error messages when the alias is not present.
;									Fixed a bad cleanup condition (called ReleaseResource on a nil
;									handle on an error (no harm, though)).
;		 <3>	 4/10/90	NB		Missed a TST.W D0. Without which, the condition codes for the
;									BNE.S which followed weren't always right. This caused
;									occasionally stack explosions.
;				  4/9/90	Nik		Added call to PrLoadDriver. This loads in the driver based on
;									the 'alis' -8192 resource in the system file, rather than on the
;									system printer string. OpenResFile and .Print also make this
;									call, instead of doing it themselves.
;	   <1.2>	 9/20/89	CCH		Rolled in System version from System sources.
;	   <1.3>	 8/28/89	SES		Removed references to nFiles.
;	   <1.2>	  8/4/89	NMB		Restored to 6.0 version of PrGlue. Ginsu is no longer in the 7.0
;									builds of the system (sigh). The glue is now a ptch, rather than
;									part of Rom7xFix.a, at least....
;	   <1.1>	  5/8/89	NMB		Gutted the whole thing and replaced it with a new glue which
;									supports the new printing manager (Ginsu)
;	   <1.0>	11/16/88	CCH		Added to EASE.
;				 2/22/87	Jay		1). Restore curMap before jumping into the print code. This used
;									to be done after comming back from the print code. The reason
;									for this fix is that by leaving curMap pointing to us we might
;									kick the application out of the resource search path. What if we
;									need a resource out of the application file while we are inside
;									the print code? 2). Also, under PrintOpen, Move PrintVars+iPrErr
;									to d0 instead of testing it. This is because if PrDrvrOpen
;									failed then it puts the error is in low memory but D0 (which is
;									also the error) gets written over on the way out from
;									PrDrvrOpen. PrintOpen tests low memory and if it is an error,
;									goes to LLOut which puts D0 in low memory! D0 at this point is
;									bad and the application does not get the correct error code. 3).
;									Save curMap in a3 before getting the PDEF resource the first
;									time.
;				 2/13/87	Jay		 1). Fixed a BAD bug with stack corruption on error exit if the
;									printer resource file does not exist in the system folder. - In
;									OpenRF, return _OpenRFPerm error in d0 - Removed ResErr check
;									after OpenRF call under OpenPrRF. The error is already in d0. -
;									Under OpenPrRF, if we have an error from OpenRF, put that error
;									in low memory and branch to GlueAbort. It used to bne to LLOut.
;									- Cleaned up GlueOut to eliminate call to _BlockMove. 2). Don't
;									close the driver during PrClose. Close the resource file only.
;									This is to eliminate the overhead of going thru .Print
;									everytime. NOTE: The old PrLink used to leave the driver open.
;									It must have been changed when PrLink was changed to PrGlue (I
;									think!). - Removed call to _PrDrvrClose from PrintClose.
;				12/23/86	Jay		If the GetResource call to get a PDEF fails, don't give up. The
;									printer resfile may not be in the resource search path. Save and
;									restore the user resource map around the GetResource (for PDEF)
;									call. Get the printer resfile refnum from the low memory print
;									var ($944+$E) or open the printer resource file to get it. After
;									opening the printer resource file, save the refnum in low
;									memory. The code to get the printer resfile refnum is now in a
;									procedure called OpenRF. Check the print error after _PrDrvrOpen
;									call in PrintOpen.
;				 11/7/86	Jay		Fixed bugs in PrDrvrDCE and PrDrvrVers. Put the result on the
;									stack at (sp) instead of at 12(a6). Then, jump to GlueOut
;									instead of LLOut. Changed Bra.s at PrOCerr to Bra.
;				 11/7/86	Jay		Fixed bug in PurgePr and NoPurgePr. Check the lower byte of
;									flags to see if the driver is RAM based.
;				  8/1/86	David		Added PrGeneral call
;				 9/17/85	Leo		Converted to Ira's New Assembler
;				 9/10/85	Leo		New trap files, added GoSetVol Changed this file to PrintGlue.a
;									no include files
;				 8/17/85	Leo		Integrated PrScreen, went to single Trap and selector.
;				  8/6/85	Leo		Added calls to SetVol/GetVol
;				 7/16/85	Leo		Fixed bug with stripping return values Removed PrCfgDialog Fixed
;									values in PrGlueTable
;				 7/13/85	Leo		from old PrLink
;
; This code is the printing glue for 128K ROM printing
; calls.  In this ROM, there is a single trap for printing,
; which is this code.  This code takes the selctor, which
; is the last parameter to every printing call, and
; dispatches to the correct routine.
;
; There are two types of printing routines:  those related
; to the high-level (PrOpenPage, etc.) interface, and
; those related to the low-level (driver calls) interface.
; The low-level interface calls are also referred to as
; 'non-link' routines throughout the comments, for reasons
; which totally escape me.
;
; The high-level interfaces are handled as one block,
; collectively referred to as PrGlue.  These routines
; simply fetch the appropriate PDEF resource from the
; current printer resource file, and jsr to a certain
; offset into the resource.  Which PDEF to use and
; how far into the PDEF to Jsr to are recorded in
; PrGlueTable, along with useful information like
; the number of bytes of parameters and return value
; there are for each entry.  This information is used
; to allow PrGlue to build a stack frame for the routine
; and call the PDEF, after which it copies the return
; information back up on the stack and returns.
;
; The non-link routines are mostly calls on the
; .Print driver.  They get themselves a iopb and
; make the call, or twiddle some aspect of the
; driver.  The routines that fool with the DCE
; of the driver or the handle to the driver itself
; get the DCE by making a Status call on the
; driver, and pulling the DCEPtr out of the CSParam
; area of the iopb.
;
; PrOpen and PrClose are high-level routines that
; do not dispatch to a PDEF.  They are responsible
; for opening/closing the current printer resource file.
; They also Open/Close the .Print driver.
;
; These routines are called with a final parameter,
; in addition to the ones listed in Inside Mac.
; As the last parameter, they take a longword
; full of information.  The format of this long
; is like so:
;
; 31	   23	 	15		 7	  	  0
; +--------+--------+--------+--------+
; |xxxxxxxx|xxxxxxxx|xxxxxxxx|xxxxxxxx|
; +--------+--------+--------+--------+
; Bits 31-27: Selector for the various routines in the glue
; Bits 26-24: Number of bytes of function result for this routine
;			  (must be either 0, 2, or 4)
; Bits 23-16: ID of PDEF to call for high level routines
; Bits 15-08: The number of bytes of parameters
;			  to this routine
; Bit  07:	  1 if the PDEF should be unlocked after
;			  the call (high level routines)
; Bits 06-00: The offset into the PDEF to Jsr to
;			  (high level routines)
; 31			  23			  15			  7				  0
; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
; |		    |	  |				  |				  |	|			  |
; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
;	   |       |          |               |        |       |
;	   |  Result Bytes	  |               |    Unlock Flag |
;Routine Selector     PDEF ID      Parameter Bytes   PDEF Offset
;
;
; Routine				Selector value
; -------               -------- -----
; (high-level routines)
; PrOpenDoc				0
; PrCloseDoc			1
; PrOpenPage			2
; PrClosePage			3
; PrintDefault			4
; PrStlDialog			5
; PrJobDialog			6
; PrStlInit				7
; PrJobInit				8
; PrDlgMain				9
; PrValidate			10
; PrJobMerge			11
; PrPicFile				12
; PrHack				13
; PrGeneral             14
; (low-level and 'non-link' routines)
; PrDrvrOpen			16
; PrDrvrClose			17
; PrDrvrDCE				18
; PrDrvrVers			19
; PrCtlCall				20
; PrPurge				21
; PrNoPurge				22
; PrError				23
; PrSetError			24
; PrOpen				25
; PrClose				26
;

			LOAD			'StandardEqu.d'
			INCLUDE			'Printing.a'
			INCLUDE         'PrPrivate.a'
			INCLUDE			'PrintTrapsEqu.a'
			INCLUDE			'Folders.a'
			INCLUDE			'Aliases.a'
			INCLUDE			'LinkedPatchMacros.a'

			MACHINE MC68020							; needed for cache flush <LW2> fau

;************************************************************************************************
;* _MDebugStr takes a string for a parameter and calls DebugStr with it.
;*
;* Example: 	_MDebugStr 'In PrOpen'
;************************************************************************************************

				MACRO
				_MDebugStr	&dbgStr

				PEA			@dbgAddr
				_DebugStr
				BRA.S		@pastDbgAddr
@dbgAddr		DC.B		&dbgStr
				ALIGN		2
@pastDbgAddr
				ENDM

PrGlue			PatchProc	$A8FD,(Plus,SE,II,Portable,IIci)
;
; A few constants regarding selector values:
PrDocLimit		EQU		3			; Highest selector for doc loop routine
PDEFLimit		EQU		15			; Highest selector for high-level (PDEF-calling)
									; routines
;
; PrGlue Entry points are below.  The idea of this entry setup is to allow PrGlue
; to determine what entry point was used in very little code space.  The Bsr.s
; pushes the return address on the stack, which PrGlue then uses to derive which
; entry point was used.  The key is that the entry points here are arranged in
; the same order as the table PrGlueTable, below.
;
; Constants:  Offsets into the PrGlue information
Selectr	EQU		8+0			; Selector for routine invoked	(Most  significant 5 bits)
FuncByt	EQU		8+0			; Bytes of function result		(Least significant 3 bits)
PDEFId	EQU		8+1			; ID of the PDEF to call		(8 bits)
ParmByt	EQU		8+2			; Bytes of parameters			(8 bits)
CodeOfs	EQU		8+3			; Offset into the PDEF of the code for this function (7 bits)
;
; Parameters to the Glue:
longAt	EQU		8			; Offset from a6 of longWord o'info
;
; PrGlue itself

		Link	a6,#0					; Stack frame, no local variables
		Movem.l a3-a4,-(sp)				; Save the regs we will use to hold info across
										; the call to the actual print routine
; Get selector in d1
		Moveq	#0,d1
		Move.b	Selectr(a6),d1			; Get the byte containing it
		Lsr.b	#3,d1					; Move selector over
		Beq.s	OpenDocOnly				; PrOpenDoc has a bunch of special case code, so don't
										; get the ID the way we do it normally
; If it's a low-level call, dispatch to that stuff
		Tst.b	Selectr(a6)				; Test the selector: high-level or low-level?
		Bmi		LowLevel				; Send the low-level calls off to thier corner
; Get Id of PDEF that this call will be dispatched to in d2
		Moveq	#0,d2					; Preset for PDEFId in d2
		Move.b	PDEFId(a6),d2			; Get PDEF Id from Glue Parameter.
		Bne.s	GetPDEF					; If that's nonzero, it's the id.  If it's zero,
										; the id should be gotten from printing globals
		Moveq	#3,d2				  	; Mask for PrintLoop type from Globals.  This
										; is also the PDEF Id to use
		And.b	PrintVars+bDocLoop,d2	; Get that info into d2
		Bra.s	GetPDEF					; ...and go to it
OpenDocOnly
; For OpenDoc, we get the print loop type, which is the PDEF Id, from
; the print record passed by the caller as a parameter.
		Move.l	20(a6),a0				; Get handle to print record
		Move.l	(a0),a0					; Deref Handle
		Moveq	#3,d2					; Mask for doc loop type
		And.b	PrJob+bJDocLoop(a0),d2	; Mask off them bits
		Andi.b	#$FC,PrintVars+bDocLoop	; Clear out those two bits in PrintVars
		Or.b	d2,PrintVars+bDocLoop	; and put the new bits in
;
; Get that PDEF
GetPDEF
		Move.w	CurMap, a3				; <22Feb87> JNP save user's resfile refnum in a3
        Clr.l   -(sp)                   ; Room for the GetResource result
        Move.l  #'PDEF',-(sp)           ; Type
        Move    d2,-(sp)                ; id
        _GetResource
        Move.l  (sp)+,d0 
		Tst.l	d0						; Test the result of GetResource
		Bne.s	GotPDEF					; we have the PDEF
		
; CurMap may be set to point to the user's res file. We need to set it to point to our resfile.
; Check the low memory global iPrRefNum. If it is $FFFF (i.e is not used and is initialised)
; then open the printer resource file to get our refnum. Otherwise use the refnum stored in the 
; low memory global to call _UseResFile. Check the result of this call, if it failed then open 
; the printer resource file to get our ref num.

		Cmpi.w	#$FFFF, iPrRefNum		; is our refnum in low memory?
		Beq.s	OpenPrRF				; no, open the printer resource file
		Move.w	iPrRefNum, -(sp)		; Try _UseResFile on this refnum
		_UseResFile
		Tst.w	ResErr					; Did it work?
		Bne.s	GetRsrc					; Yes, so get the PDEF
OpenPrRF
		MOVE.W	D2, -(SP)				; save D2 across the call to FetchDriver
		Bsr		FetchDriver				; Open our res file
		MOVE.W	(SP)+, D2				; restore D2 as soon as possible
		Tst.w	d0						; success?
		Beq.s	Continue				; <13Feb87> JNP yes, continue
		Move.w	d0, PrintVars+iPrErr	; <13Feb87> JNP no, set error and get out.
		Bra		GlueAbort				; <13Feb87> JNP
Continue								; <13Feb87> JNP
		Move.w	iPrRefNum, -(sp)
		_UseResFile						; our resfile is opened, now let's use it.
GetRsrc
        Clr.l   -(sp)                   ; Room for the GetResource result
        Move.l  #'PDEF',-(sp)           ; Type
        Move    d2,-(sp)                ; id
        _GetResource					; get that PDEF
        Move.l  (sp)+,d0 
		Tst.l	d0						; Test the result of GetResource
		Bne.s   GotPDEF
; Can't get the resource... set PrError, and jump down to the return point
		Move.w	a3, -(sp)				; User's res file refnum
		_UseResFile						; Restore user's Resource map. Refnum is on the stack.
		Move.w	#resNotFound,PrintVars+iPrErr
		Bra		GlueAbort
;
GotPDEF
		Move.l	d0,a4					; Transfer the handle to an a-reg
		Move.l	a4,a0					; Lock that baby down

; Some programmers are pretty slimy and load a PDEF that is empty.  They then					<LW2> fau
; stuff some code into it.  However, since HLOCK does not flush the cache anymore,				<LW2> fau
; the code that they stuff into it might not get written back to memory.  To solve this,		<LW2> fau
; we check here whether the PDEF resource size is less than, say, 32 bytes.  If so, we			<LW2> fau
; assume that they have already loaded the PDEF and modified it, so we flush the cache			<LW2> fau
; for them.																						<LW2> fau

		_GetHandleSize					; How big is our PDEF Handle					<LW2> fau
		cmp.l		#32,D0				; Is it "small"									<LW2> fau
		bhi.s		@RealPDEF			; no, don't flush the cache						<LW2> fau
		jsr			([jCacheFlush])		; else, flush the caches.						<LW2> fau
@RealPDEF										;										<LW2> fau
		_HLock
;<22Feb87> JNP Restore curMap before jumping into the print code.
		Move.w	a3, -(sp)				; <22Feb87> JNP user's resfile refnum
		_UseResFile						; <22Feb87> JNP Restore user's Resource map.
; Copy the parameters and return value of the routine down onto the stack again
		Lea		12(a6),a0				; Start of old parameters
		Moveq	#7,d0					; Get bytes of param + bytes of return value in d0
		and.b	FuncByt(a6),d0			; Together, these are the number of bytes to copy
		Add.b	ParmByt(a6),d0
		Sub.w	d0,sp					; We know the thing isn't actually more than a word wide
		Move.l	sp,a1					; Beginning of destination
		_BlockMove						; Note: Leaves d0 = 0
; Call the routine.  The offset into the PDEF to jump to is given by the glue parameter
		Move.b	CodeOfs(a6),d0			; Get offset (note high part of d0 is still 0)
		Andi.b	#$7F,d0					; Mask off the unlock bit that is stored there
		Move.l	(a4),a0					; Deref PDEF handle
		Jsr		0(a0,d0)				; Call the routine
; Unlock the PDEF if the unlock bit from PrGlueTable is set
		Move.b	CodeOfs(a6),d0			; The unlock bit is the high-order bit of this byte, so...
		Bpl.s	NoUnlock
		Move.l	a4,a0
		_HUnlock						; make it float again
NoUnlock
		Bra		GlueOut
;
; All the low-level routines are implemented here
LowLevel
; Allocate and set up for .Print call a iopb on
; the stack
		Sub.w	#IOQElSize,sp			; Get an iopb
		Lea		PrintName,a0			; Address of .Print string
		Move.l	a0,ioFileName(sp)		; Put in iopb
		Move.w	#iPrDrvrRef,ioRefNum(sp); Put refNum in iopb
		Clr.b	ioPermssn(sp)			; Always a good idea
		Move.l	sp,a0					; Put pointer in a0
; The selector is in d1.  We're gonna do a jump table on
; it.  After the jump table, everybody should branch
; back to LLOut.
		Moveq	#0,d0					; Since LLOut uses d0 as a return code,
										; let's make sure it's something reasonable
		Bclr	#4,d1					; We don't want the high bit
		Add.w	d1,d1					; Shift selector left one
		Move.w	LLJump(d1),d1			; Get jump table entry
		Jmp		LLJump(d1)				; Go to correct entry
LLJump
		DC.W	DrvrPrOpen-LLJump	 	; PrDrvrOpen			16
		DC.W	DrvrPrClose-LLJump		; PrDrvrClose			17
		DC.W	DrvrDCE-LLJump			; PrDrvrDCE				18
		DC.W	DrvrVers-LLJump			; PrDrvrVers			19
		DC.W	CtlCall-LLJump			; PrCtlCall				20
		DC.W	PurgePr-LLJump			; PrPurge				21
		DC.W	NoPurgePr-LLJump		; PrNoPurge				22
		DC.W	GetError-LLJump			; PrError				23
		DC.W	SetError-LLJump			; PrSetError			24
		DC.W	PrintOpen-LLJump		; PrOpen				25
		DC.W	PrintClose-LLJump		; PrClose				26
		DC.W	LoadDriver-LLJump		; Load Driver			27
		DC.W	LLBadParam-LLJump		; not implemented		28
		DC.W	LLBadParam-LLJump		; not implemented		29
		DC.W	LLBadParam-LLJump		; not implemented		30
		DC.W	LLBadParam-LLJump		; not implemented		31
LLBadParam
		Move.w	#paramErr,PrintVars+iPrErr	; Yes, say params in error
GlueAbort
		Moveq	#0,d1					; Get the number of bytes of parameter to this entry in d1
		Move.b	ParmByt(a6),d1			; Get from the glue parameter, source of all knowledge...
		Bra		PrExit

LoadDriver
		BSR		FetchDriver				; error in D0

;	LLOut is the exit point for this routine. It takes the error in D0 and sets
;	iPrErr with it. We only want that to happen under two circumstances:
;	[1] when the error is uninitialized and
;	[2] when the error is noErr.
;	If the error is already set, we want to leave it alone. This code manages
;	that change.		<11>

		MOVE.W	PrintVars+iPrErr, D1	; get the error in D1 (faster than low-mem access)
		CMPI.W	#-1, D1					; is error uninitialized?
		BEQ		LLOut					; Yes, use D0 to set it.
		
		TST.W	D1						; Otherwise, is an error pending?
		BZ		LLOut					; no, so set the error from D0 in LLOut
		MOVE.W	D1, D0					; otherwise, refresh the D0 error for exit
		BRA		LLOut					; LLOut will therefore not reset the error.

PrintOpen
		_PrDrvrOpen						; Open the .Print driver
		Move.w	PrintVars+iPrErr, d0	; <22Feb87> JNP Move the error into d0
		BNE.S	PrOCerr					;abort if error.
		ST		-(SP)					;Mark call "open", by setting a byte true on stack (NB, 3/23/90)
		BRA.S	PrOCcom
PrintClose
;<13Feb87> JNP removed call to _PrDrvrClose
		; DON'T check for an answer		; just keep slogging through
		SF		-(SP)					;Mark Call "close" by setting stack byte false. <NB: 3/23/90>
PrOCcom
		Bsr		FetchDriver				; Open the printer resource file, error in D0
		MOVE.B	(SP)+, D1				; get the flag byte in D1. Always clean up stack!

		Tst.w	D0
		Bne.s	PrOCerr					; Error! get out
; Test result of OpenResFile
		Move.w	iPrRefNum, d0			; get the refnum in d0
		Tst.w	ResErr
		Bne.s	@26
;Now return for opens, or close the resfile with the id
;found above if closing.
		TST.B	D1						;Open Call?
		BNZ.S	@26						;Yes: Go home
		MOVE.W	D0,-(SP)				;No: CloseResFile. Push the refnum param
		_CloseResFile
@26
		Move.w	ResErr,d0
PrOCerr
		Bra		LLOut
DrvrPrOpen
		CLR.W	PrintVars+iPrErr		; force error to noErr at startup for a clean beginning
		_Open							; Do the open
		Bra.s	LLOut					; and out
DrvrPrClose
		_Close							; Do the close
		Bra.s	LLOut					; and out
DrvrDCE									;
		Bsr.s	GetDCEHandle			; Get DCE handle in a0
		add.w 	#IOQELSize-4, sp		; Leave room for the DCEHandle
		Move.l	a0, (sp)				; Move the handle to the stack, 
										; Glueout will pick up the value and adjust the stack
		Bra.s	GlueOut					; get out
DrvrVers								; 
		Bsr.s	GetDCEHandle			; Get DCE handle in a0
		Move.l	(a0),a0					; Deref it
		Moveq	#0, d0
		Move.b	DCtlQueue+1(a0),d0		; Get the version byte
		add.w 	#IOQELSize-2, sp		; Leave room for one word
		Move.w	d0, (sp)				; Move the version# to the stack, 
										; Glueout will pick up the value and adjust the stack
		Bra.s	GlueOut					; Get out
CtlCall
		Move.l	12(a6),csParam+8(a0)	; lParam3
		Move.l	16(a6),CSParam+4(A0)	; lParam2
		Move.l	20(a6),CSParam(A0)		; lParam1
		Move.w	24(a6),CSCode(A0)		; iWhichCtl
		_Control
		Bra.s   LLOut					; and out
PurgePr
		Bsr.s	GetDCEHandle			; Get DCE handle in a0
		Move.l	(a0),a0					; Deref DCE handle
		Btst	#dRAMBased,dCtlFlags+1(a0); Is this a RAM-based driver?
		Beq.s	LLOut					; No?  Well then it's not gonna purge
		Move.l	DCtlDriver(a0),a0		; Get driver handle
		_HPurge							; make purgeable
		Bra.s	LLOut
NoPurgePr
		Bsr.s	GetDCEHandle			; Get DCE handle in a0
		Move.l	(a0),a0					; Deref DCE handle
		Btst	#dRAMBased,dCtlFlags+1(a0); Is this a RAM-based driver?
		Beq.s	LLOut					; No?  Well then it's won't purge anyway
		Move.l	DCtlDriver(a0),a0		; Get driver handle
		_HNoPurge						; make non purgeable
		Bra.s	LLOut
GetDCEHandle
		Move.w	#1,csCode(a0)			; The old get-the-DCE status call
		_Status
		Move.l	csParam(a0),a0			; Get DCE Handle
		Rts
GetError
		add.w	#IOQElSize-2,sp			; Strip parameter block except for one word
		Move.w	PrintVars+iPrErr,(sp)	; Get error code
		Bra.s	GlueOut
SetError
		Move.w	12(a6),d0				; Set the error code in register
;
; LLOut: All the low-level routines return here, with
; their error code in d0.
LLOut
		Add.w	#IOQElSize,sp			; Strip parameter block
		Move.w	d0,PrintVars+iPrErr		; Set return code
GlueOut
;
; Get the number of bytes of parameter to this entry in d1
		Moveq	#0,d1
		Move.b	ParmByt(a6),d1			; Get from the table, source of all knowledge...
; Copy the function value, if any, back up to the caller's stack frame
		Moveq	#7,d0					; We're going for # bytes function value in d0
		and.b	FuncByt(a6),d0			; Got 'em
		Beq.s	NoRetVal
		Move.l	sp,a0					; The function left its result on top of stack
		Lea		12(a6,d1),a1			; The place we want to go is after the original params
		Lsr.w	#1, d0					; <13Feb87> JNP
		Bra.s	@1						; <13Feb87> JNP
@2		Move.w	(sp)+, (a1)+			; <13Feb87> JNP
@1		Dbf		d0, @2					; <13Feb87> JNP
NoRetVal
		Move.w	PrintVars+iPrErr, d0	; Leave function result in D0 <12> NB
PrExit
;
; Unwind our stack frame and strip the params (# bytes params still in d1)
		Movem.l	(sp)+,a3-a4
		Unlk	a6
		Move.l	(sp)+,a0				; Return address
		Adda.l	d1,sp					; Strip params
		Addq	#4,sp					; Strip glue parameter
		Jmp		(a0)					; ...and we're out
;
; Subroutines for PrGlue
;

kStartupDisk		EQU	-1

;************************************************************************
; FindSpecialFolder - find the dirID of a special folder
;	<12jan90 fjs, 3/22/90 used a stack frame: nb>
;
;	in:	d0 = foldertype 	(ie 'extn')
;	out:	d0 = dirID 			(or 0 if an error occurred)		( this is a lie --sad & ich )
;************************************************************************

FSFStackFrame	RECORD	0,decr

vRefNum			DS.W	1
dirID			DS.L	1

kFSFSize		EQU	*
				ENDR

FindSpecialFolder
				WITH		FSFStackFrame
				LINK		A6, #kFSFSize
				SUBQ.W		#2, SP						; space for error
				MOVE.W		#kStartupDisk, -(SP)		; this volume
				MOVE.L		D0, -(SP)					; folder type (input)
				SF			-(SP)						; don't create
				PEA			vRefNum(A6)					; ptr to the output vRefNum
				PEA			dirID(A6)					; ptr to output dirID
				_FindFolder
				MOVE.W		(SP)+, D0					; fetch error
				BNZ.S		@bail						; oh, well. Unlink and out.

				MOVE.L		dirID(A6), D0				; if no error, copy dirID into output reg.

@bail			UNLK			A6
				RTS
				ENDWITH

;************************************************************************
; FetchDriver: open the system printer's resource file:
;	We do this by resolving the alias written into the system file by
;	the chooser.  This alias maps from the system file to the driver.
;	We canonify the system file, and then call ResolveAlias to create
;	a canonified representation of the driver.  That representation
;	contains the information needed by HOpenResFile, which we then call.
;	Any error is returned in D0.
;************************************************************************

FetchDriver

;************************************************************************
; CanonSysFile: Canonify the system file
;
;	sysFileCanon(A6) contains the output CanonSpec if the routine succeeds.
;	If an error occurs, the entire routine is abandoned, with the error in D0.
;
; pascal OSErr CanonifyFile(short vRefNum,
;							long dirID,
;							const Str255 *fileName,
;							CanonicalFileSpec	*canonicalFile);
;************************************************************************

SpecRec			RECORD	0,decr

sysFileSpec		DS.B	FSSpec.size
driverSpec		DS.B	FSSpec.size
aliasHandle		DS.L	1
wasChanged		DS.B	1
	if	theFuture	then								; PURGEALIAS
aliasState		DS.B	1					; State of the alias
	endif 												; PURGEALIAS
	
	ALIGN	2

kSpecSize		EQU	* - SpecRec
				ENDR


kAliasID		EQU		-8192							; System Printer alias's resID

				WITH	SpecRec

				LINK	A6, #kSpecSize

				MOVE.L	#kSystemFolderType, D0			; get this folder's dirID
				BSR.S	FindSpecialFolder				; if cond code < 0, then we have an error
				BMI		@Bail							; if failure, exit routine, error in D0

		; create a file spec for the system file

				MOVE.W	#kStartupDisk, sysFileSpec + FSSpec.vRefNum(A6)	; VRefNum of startup disk
				MOVE.L	D0, sysFileSpec + FSSpec.parID(A6)					; dirID from FetchSpecialFolder
				
				MOVEQ	#0, D0				; clear out D0 for BlockMove
				LEA		SysResName, A0		; Copy system file's name
				MOVE.B	(A0), D0			; which is this long
				ADDQ.B	#1, D0				; plus that length byte!
				LEA		sysFileSpec + FSSpec.name(A6), A1	; to the FSSpec
				_BlockMove
				
		; ResolveDriver: Resolve the alias using the system file's FSSpec.

				SUBQ	#4, SP							; allocate space for GetResource
				MOVE.L	#rAliasType, -(SP)				; get this type
				MOVE.W	#kAliasID, -(SP)				; get this ID
				_GetResource							; fetch, boy!
				MOVE.L	(SP)+, D0						; this is the handle
				MOVE.L	D0, aliasHandle(A6)				; save it across all these calls
				BNZ.S	@ResolveIt						; got one. Off we go...

; This is a new problem for the glue. If the resource for the alias is not found, then
; we would normally return resNotFound. The glue used to return fnfErr whenever it couldn't
; open the driver and applications have coded for that error. Rather than add an error
; code, we map resNotFound to fnfErr and save the user some grief.

@failedGetRes
				MOVE.W	ResErr, D0						; copy error into output var
				BNZ.S	@Bail							; and exit if non-zero
				MOVE.W	#fnfErr, D0						; else, return fnfErr so apps alert the user correctly
				BRA.S	@Bail							; and exit.

@ResolveIt		
	if	theFuture	then								; PURGEALIAS
				Move.l	aliasHandle(A6),A0
				_HGetState
				Move.b	D0,aliasState(A6)				; Save the Alias state.
				_HNoPurge								; Make the alias non-purgeable
	endif 												; PURGEALIAS

				SUBQ.W	#2, SP							; space for error
				PEA		sysFileSpec(A6)					; first parameter
				MOVE.L	D0, -(SP)						; the alias handle
				PEA		driverSpec(A6)					; ptr to driverSpec
				PEA		wasChanged(A6)					; ptr to output boolean (ignored)
				_ResolveAlias
				MOVE.W	(SP)+, D0						; got the error here.
				BNZ.S	@Cleanup

				TST.B	wasChanged(A6)					; check if the alias needs updating
				BZ.S	@CallHOpenRes					; Nope, keep going

				MOVE.L	aliasHandle(A6), -(SP)			; Now set the resource changed
				_ChangedResource
				TST.W	ResErr
				BNZ.S	@Cleanup						; exit on error
				
				CLR.W	-(SP)							; Update the system file
				_UpdateResFile							; (refnum = 0)
				TST.W	ResErr
				BNZ.S	@Cleanup						; exit on error

@CallHOpenRes
				SUBQ.W	#2, SP							; space for function result
				MOVE.W	driverSpec + FSSpec.vRefNum(A6), -(SP)	; parameter 1: vRefNum
				MOVE.L	driverSpec + FSSpec.parID(A6), -(SP)	; parameter 2: parent ID
				PEA		driverSpec + FSSpec.name(A6)			; parameter 3: ptr to fileName
				MOVE.B	#fsCurPerm, -(SP)				; set permission to "current"
				_HOpenResFile

				MOVE.W	(SP)+, D0						; grab function result

				MOVE.W	D0, iPrRefNum					; If it worked, then set the refnum
				MOVE.W	ResErr, d0						; set the error in D0

@Cleanup

	if	theFuture	then								; PURGEALIAS
				Move.l	aliasHandle(A6),A0
				Move.b	aliasState(A6),D0				; Restore the alias state.
				_HSetState
	endif
				MOVE.L	aliasHandle(A6), -(SP)			; release the alias resource
				_ReleaseResource

@Bail			UNLK	A6								; error in D0.
				RTS
				ENDWITH

; Name of the .Print driver

			STRING	PASCAL
PrintName	DC.B	'.Print'
			ALIGN

			ENDPROC

			
			END