open.aii

	include 'gsos.equ'
	include 'minix.equ'
	include 'records.equ'
	
	include 'fst.equ'

	include 'fst.macros'

	include 'M16.Debug'



	import do_ignore
	import do_refnum
	import do_file_type
	import do_aux_type
	import do_storage_type
	import do_option_list
	import do_eof
	import do_blocks
	import do_r_eof
	import do_r_blocks
	import do_create_date_time
	import do_mod_date_time

	entry do_fcr_access
	entry check_resource
	entry check_access
	entry build_fcr

	import path_to_inode
	import load_inode

	import disk_inode:v1_inode
	import disk_super:v1_super

open	procname export

	with fst_parms
	with dev_parms
	with dp

	; find the inode...

	jsr path_to_inode
	bcs exit

	jsr load_inode
	bcs exit


	; sanity check the parameters.
	jsr check_resource
	bcs exit

	jsr check_access
	bcs exit


	; now create the fcr.
	jsr build_fcr
	bcs exit

	; output fields...

	lda <call_class
	beq class0

class1
	lda [param_blk_ptr] ; pcount
	dec a
	asl a ; x 2
	asl a ; x 4
	tax
	dispatch open_dcb_1
	lda tool_error
	cmp #1
	rtl

class0
	ldx #open_dcb_0_size-4
	dispatch open_dcb_0
	lda tool_error
	cmp #1
	rtl

exit
	rtl

open_dcb_0
	dc.w 0, do_refnum
	; all remaining fields are read-only.
open_dcb_0_size equ *-open_dcb_0

open_dcb_1
	;dc.w 0, do_ignore	; pCount
	dc.w $02, do_refnum	; refNum 
	dc.w $04, do_ignore	; path
	dc.w $08, do_ignore	; request access
	dc.w $0a, do_ignore	; resource resourceNumber
	dc.w $0c, do_fcr_access	; actual access
	dc.w $0e, do_file_type
	dc.w $10, do_aux_type
	dc.w $14, do_storage_type
	dc.w $16, do_create_date_time
	dc.w $1e, do_mod_date_time
	dc.w $26, do_option_list
	dc.w $2a, do_eof
	dc.w $2e, do_blocks
	dc.w $32, do_r_eof
	dc.w $36, do_r_blocks


	endp

build_fcr proc

	with dp
	import target:GSString32

	; use vcr.vname.  this is only needed for device-relative paths, anyhow.
	; can vcr be invalidated?  copy vcr.vname to target, just in case.

	ldy #vcr.vname.length
	lda [my_vcr],y
	sta target.length
	ldx #0
	ldy #vcr.vname.text
vcr_vname
@loop
	lda [my_vcr],y
	sta target.text,x
	iny
	iny
	inx
	inx
	cpx target.length
	bcc @loop


	; build filename string...
	lda #fcr.__sizeof
	ldx #target
	ldy #^target
	jsl alloc_fcr
	bcc @ok
	lda #out_of_mem
	rts
@ok

	jsl deref
	stx my_fcr
	sty my_fcr+2

	ldy #vcr.open_count
	lda [my_vcr],y
	inc a
	sta [my_vcr],y

	lda #read_access
	ldy #fcr.access
	sta [my_fcr],y

	lda #fst_id
	ldy #fcr.fst_id
	sta [my_fcr],y


	ldy #vcr.id
	lda [my_vcr],y
	ldy #fcr.vcr_id
	sta [my_fcr],y

	lda inode
	ldy #fcr.inode
	sta [my_fcr],y

	lda #0
	ldy #fcr.dirty
	sta [my_fcr],y

	ldy #fcr.mark
	sta [my_fcr],y
	iny
	iny
	sta [my_fcr],y
	
	; memory is 0-filled.

	; copy the disk inode

	ldx #v1_inode.__sizeof - 2
	ldy #fcr.disk_inode.__end - 2
fcr_inode
@loop
	lda disk_inode,x
	sta [my_fcr],y
	dey
	dey 
	dex
	dex
	bpl @loop

	clc
	rts

	endp


check_resource	procname
	; verify the resourceNumber is ok
	; sets a/carry on error.

	with fst_parms, dp

	lda <call_class
	beq done

	lda [<param_blk_ptr] ; pcount
	cmp #4
	blt done
	ldy #OpenRecGS.resourceNumber
	lda [<param_blk_ptr],y
	beq done
	cmp #1
	bne param_range

	lda #res_not_found
	sec
	rts

param_range
	lda #parm_range_err
	sec
	rts

done
	clc
	rts
	endp

do_fcr_access	procname
	with fst_parms, dp

	phy
	ldy #fcr.access
	lda [my_fcr],y
	ply
	sta [param_blk_ptr],y
	rts
	endp

check_access	procname

	with fst_parms, dp

	; todo .... 
	; for now, read-only.

	; class 0 ok
	; class 1 w/ pcount < 4 ok
	lda call_class
	beq done
	lda [param_blk_ptr]
	cmp #4
	bcc done

	ldy #OpenRecGS.requestAccess
	lda [param_blk_ptr],y

	; 0 or 1 are acceptable.
	cmp #2
	bcc done

	lda #invalid_access
	sec
	rts

done
	clc
	rts
	endp

	end