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	TITLE PASLNK - MODULE TO RETURN STUFF FROM SCAN TO PASREL
	TWOSEG

;edit history

;2 - modify pushf so caller can detect problems in openning file
;3 - add clribf to clear input buffer on compile error
;4 - for tenex simulate PPNST
;5 - add curname to do JFNS

	search monsym,pasunv,uuosym
	if1, <printx Tops-20(%3 or later) version>
	reg==b
	reg1==c
	reg2==d
	reg3==e
	reg4==f
	reg5==g
	reg6==h
	opdef ppnst[jsys 557]

	lookl==6	;length of lookup block made by passcn
	openl==3	;length of open block
	pathl==9	;length of path block made by passcn
	infil==2	;ac containing file block for input
	outfil==3	; " output
	relfil==4	; " rel file
	file==5		; " current file block
	data==6		; " current data block from passcn (lookl+openl+pathl)
	bptr==7		; " byte pointer for making up file spec
	bptr6==10	; " byte pointer for sixbit conversion
	gjfl==11	;flags for gtjfn in pascnv
	p==17
	t==1
	t0==0

	reloc 0
oldf:	block filcmp+1
oldfen=.-1

spec:	block 12	;longest possible tops-20 file spec
specl==.-1

	RELOC 400000
	ENTRY PASPRM
	ENTRY PASXIT
	entry clribf,curnam
	entry pushf
	entry popf
	extern resetf,clofil 

pasprm:	movem relfil,relfcb##	;store for restart
	move file,infil	;convert input file spec
	movei data,inblk##
	movsi gjfl,(gj%old)
	pushj p,pascnv
	move file,outfil
	movei data,outblk##
	movsi gjfl,(gj%fou)
	pushj p,pascnv
	move file,relfil
	movei data,relblk##
	movsi gjfl,(gj%fou)
	pushj p,pascnv
	movei t,relnam##	;beginning of parameter block to return
	movem t,1(p)		;place PASCAL expects returned thing
	popj p,
	popj p,

pascnv:	push p,a		;these ac's will be used in jsys's
	push p,b
	push p,c
	setzm spec		;clear spec area
	move t,[xwd spec,spec+1]
	blt t,specl
	move bptr,[point 7,spec]

;copy device name
	move bptr6,[point 6,lookl+1(data)]
	movei t,6
	pushj p,from6
	movei a,":"
	idpb a,bptr

;copy directory name (if PPN given)
	skipn b,.rbppn(data)
	jrst pascn3		;no PPN
	move a,[point 7,spec]	;overwrite old device with dev:direct

ife tenex,<
	move c,a		;c _ device to which PPN applies
	ppnst
	 erjmp badcnv
	move bptr,a		;updated output ptr to bptr
> ;ife tenex

ifn tenex,<
 ;[4] output a directory name from PPN using DIRST.  Some sites (SUMEX) have 
 ;a SCN7B which knows about tenex directory names, so one may say:
 ;obj_<directory>source, rather than obj_source[1,dir#]
	movei	c,"<"
	idpb	c,a		;open the directory name
	movei	b,0(b)		;DIRST needs dir # in RH
	dirst
	 erjmp	badcnv		;in case it fails
	movei	c,">"
	idpb	c,a		;close the directory name
	move bptr,a		;updated output ptr to bptr
> ;ifn tenex

;copy file name
pascn3:	move bptr6,[point 6,.rbnam(data)]
	movei t,6
	pushj p,from6
	movei a,"."
	idpb a,bptr

;copy extension
	move bptr6,[point 6,.rbext(data)]
	movei t,3
	pushj p,from6

;now get the jfn
	movsi a,(gj%flg!gj%sht)	;short jfn, returning flags
	move b,[point 7,spec]
tryjfn:	ior a,gjfl		;input or output flags
	gtjfn
	 erjmp badcnv
	move b,file
	pushj p,initb.##
	movem a,filjfn(file)
	pop p,c
	pop p,b
	pop p,a
	popj p,

;here if error in converting file spec - get from tty:
badcnv:	movei a,[asciz /PASCNV - /]
	esout
	movei a,.priou		;to tty
	hrloi b,.fhslf		;this process
	setz c,			;as many bytes as you like
	erstr
	 jfcl
	 jfcl
	hrroi a,[asciz / - /]
	psout
	hrroi a,spec
	psout
	hrroi a,[asciz /
New file spec: /]
	psout
	movsi a,(gj%msg!gj%cfm!gj%fns!gj%flg!gj%sht)
	move b,[xwd .priin,.priou]
	jrst tryjfn		;now try again

;routine to put sixbit thing in the spec
from6:	ildb c,bptr6
	jumpe c,cpopj
	addi c,40
	idpb c,bptr
	sojg t,from6
cpopj:	popj p,

clribf:	movei a,.priin
	cfibf			;clear input buffer
	popj p,

;curname(file,string)
;  put current file spec into string
;b - FCB
;c - string addr
;d - string length

curnam:	addi d,4		;d _ string length in words
	idivi d,5
	move t0,[ascii /     /]	;now init string to blanks
	movem t0,(c)
	hrli a,(c)
	hrri a,1(c)
	add d,c
	blt a,-1(d)
	hrro a,c		;now do jfns
	hrrz b,filjfn(b)
	move c,[exp 111110000001] ;full file spec
	setz d,
	jfns
	movei t0,40		;put blank in over null at end
	idpb t0,a
	popj p,

pasxit:	movei reg,input##
	setz reg1,
	pushj p,clofil
	movei reg,output##
	setz reg1,
	pushj p,clofil
	move reg,relfcb
	setz reg1,
	pushj p,clofil
	jrst calscn##

pushf:	hrl t,reg		;copy old fcb
	hrri t,oldf
	blt t,oldfen
	pushj p,init.b##	;reinit fcb
	setz a,			;indicate text file
	seto reg3,		;[2] so we can see errors
	setzb reg4,reg5		;[2]
	movei reg6,30		;[2] let us see open errors and EOL char
	pushj p,resetf
	popj p,

popf:	push p,reg
	setz reg1,
	pushj p,clofil
	pop p,reg
	hrli t,oldf
	hrr t,reg
	blt t,filcmp(reg)
	popj p,

	end