A2osX/ProDOS.FX/ProDOS.S.XDOS.D.txt

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NEW
AUTO 3,1
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*--------------------------------------
XDOS.Read jsr XDOS.GetUserBuf xfer buffer address and request count
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jsr mvcbytes to a more accessable location, also
pha get fcb attributes and save on stack.
jsr XDOS.CalcNewMark calc mark after read, test if mark > eof
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pla carry set means end mark > eof.
and #$01 test for read enabled.
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beq .9
bcc L4205 branch if result mark < eof. adjust
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ldy XDOS.FCBPtr request to read until just before eof.
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lda XDOS.FCBs+FCB.EOF,y result = (eof-1) - position
sbc XDOS.TmpPos
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sta cbytes
sta rwreql
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lda XDOS.FCBs+FCB.EOF+1,y
sbc XDOS.TmpPos+1
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sta cbytes+1
sta rwreqh
ora cbytes if both bytes = 0 then eof error
bne L4210
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lda #MLI.E.EOF
.HS 2C
.9 lda #MLI.E.LOCKED
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L4202 jmp errfix1
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L4205 lda cbytes
ora cbytes+1
bne L4210 if read request definitely non-zero.
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L420D jmp rwdone do nothing.
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L4210 jsr valdbuf validate user's data buffer range.
bcs L4202 branch if memory conflict.
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jsr XDOS.GetFCB.ST get storage type
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cmp #$04 and find out if it's a tree or other.
bcc L421F branch if a tree file
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jmp XDOS.ReadDir otherwise assume it's a directory.
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L421F jsr rdposn set up data pointer.
bcs L4202 errors.
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jsr preprw test for newline, setup for partial
jsr readpart read. move current data buffer contents
bvs L420D to user area. branch if satisfied.
bcs L421F indicates newline is set.
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lda rwreqh how many blocks are to be read ?
lsr if < 2 then use the slow way.
beq L421F
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sta cmdtemp save bulk block count.
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jsr XDOS.GetFCBStatus make sure current data area doesn't
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and #$40 need writing before resetting ptr to
bne L421F read into user's area. branch if data
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sta ioaccess needs to be written to force 1st call
lda ZP.UserBuf thru all dev handler checking. make
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sta ZP.DataPtr the data buffer the user's space.
lda ZP.UserBuf+1
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sta ZP.DataPtr+1
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L4249 jsr rdposn get next block directly into user space.
bcs L42B7 if error.
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L424E inc ZP.DataPtr+1 incll ptrs by one block (512 bytes)
inc ZP.DataPtr+1
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dec rwreqh
dec rwreqh
inc XDOS.TmpPos+1
inc XDOS.TmpPos+1
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bne L4269 if pos'n doesn't get to a 64k boundary
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inc XDOS.TmpPos+2 otherwise, must check for a 128k one.
lda XDOS.TmpPos+2 carry set if 128k boundary reached.
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eor #$01
lsr
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L4269 dec cmdtemp has all been read fast ?
bne L427B branch if more to read.
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jsr fxdatptr go fix up data pointer to xdos buffer.
lda rwreql test for end of read.
ora rwreqh are both 0 ?
beq rwdone yes, done.
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bne L421F no, read last partial block
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L427B bcs L4249
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jsr XDOS.Tpos2Y get index to next block address
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lda (zpt),y get low address
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sta ZP.BLKNUM
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inc zpt+1
cmp (zpt),y are hi and low address the same?
bne L4299 no, it's a real block address.
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cmp #$00 are both bytes 0 ?
bne L4299 no, must be real data.
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sta ioaccess don't do repeat io just after sparse.
beq L429C branch always (carry set).
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L4299 lda (zpt),y get high address
clc
L429C dec zpt+1
bcs L4249 if no block to read.
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sta ZP.BLKNUM+1
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lda ioaccess has 1st call gone to device yet ?
beq L4249 no, go thru normal route
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lda ZP.DataPtr+1 reset hi buffer address for dev handler
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sta ZP.BUFPTR+1
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jsr XDOS.DevCall
bcc L424E no errors, branch always.
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L42B7 pha save error code.
jsr fxdatptr go restore data pointers, etc.
pla
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errfix1 pha save error code
jsr rwdone pass back # of bytes actually read
pla
sec error
rts
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*--------------------------------------
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rwdone ldy #$06 return total # of bytes actually read
sec derived from cbytes-rwreq.
lda cbytes
sbc rwreql
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sta (ZP.A3L),y
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iny
lda cbytes+1
sbc rwreqh
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sta (ZP.A3L),y
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jmp rdposn leave with valid position in fcb.
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*--------------------------------------
preprw ldy XDOS.FCBPtr adj pointer to user's buffer to make
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sec the transfer
lda ZP.UserBuf
sbc XDOS.TmpPos
sta ZP.UserBuf
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bcs .1 if no adjustment to hi address needed
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dec ZP.UserBuf+1
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.1 lda XDOS.FCBs+FCB.NLMASK,y test for new line enabled.
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clc
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beq .2 if new line not enabled.
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sec carry indicates new line enabled
sta nlmask
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lda XDOS.FCBs+FCB.NLBYTE,y move newline character to more
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sta nlchar accesible spot.
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.2 ldy XDOS.TmpPos index to 1st data.
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lda ZP.DataPtr reset low order of position pointer to
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sta sos beginning of page.
ldx rwreql get low order count of requested bytes.
rts return statuses.
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*--------------------------------------
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readpart txa x = low count of bytes to move.
bne L430F branch if request is not an even page.
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lda rwreqh a call of 0 bytes should never get here!
beq L435D branch if nothing to do.
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dec rwreqh
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L430F dex
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L4310 lda (sos),y move data to user's buffer
sta (ZP.UserBuf),y
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bcs tstnewl test for newline 1st !
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L4316 txa note: x must be unchanged from tstnewl !
beq L4332 go see if read request is satisfied...
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L4319 dex dec # of bytes left to move.
iny page crossed ?
bne L4310 no, move next byte.
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lda sos+1 test for end of buffer, but first
inc ZP.UserBuf+1 adjust user buffer pointer
inc XDOS.TmpPos+1 and position
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bne L4329
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inc XDOS.TmpPos+2
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L4329 inc sos+1 and sos buffer high address.
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eor ZP.DataPtr+1 (carry is undisturbed)
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beq L4310 branch if more to read in buffer.
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clv indicate not finished.
bvc L4360 always.
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L4332 lda rwreqh
beq L4350 branch if request is satisfied.
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iny done with this block of data ?
bne L4340 no, adjust high byte of request.
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lda sos+1 maybe, check for end of block buffer.
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eor ZP.DataPtr+1 (don't disturb carry).
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bne L4343 if hi count can be dealt with next time
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L4340 dec rwreqh
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L4343 dey restore proper value
bra L4319
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tstnewl lda (sos),y get last byte transferred again.
and nlmask only bits on in mask are significant.
eor nlchar does it match newline character?
bne L4316 no, read next.
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L4350 iny adjust position.
bne L435D
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inc ZP.UserBuf+1 inc pointers
inc XDOS.TmpPos+1
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bne L435D
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inc XDOS.TmpPos+2
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L435D bit setvflg (sets v flag)
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L4360 sty XDOS.TmpPos save low position
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bvs L4366
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inx leave request as +1 for next call
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L4366 stx rwreql and remainder of request count.
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php save statuses
clc adjust user's low buffer address
tya
adc ZP.UserBuf
sta ZP.UserBuf
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bcc L4374
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inc ZP.UserBuf+1 adjust hi address as needed.
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L4374 plp restore return statuses.
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setvflg rts this byte ($60) is used to set v flag.
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*--------------------------------------
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fxdatptr lda ZP.DataPtr put current user buffer address back to normal
sta ZP.UserBuf
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lda ZP.DataPtr+1
sta ZP.UserBuf+1 bank pair byte should be moved also.
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ldx XDOS.FCBPtr restore buffer address
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jmp XDOS.GetFCBBufX
*--------------------------------------
XDOS.ReadDir jsr rdposn
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bcs L43B8 pass back any errors.
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jsr preprw prepare for transfer.
jsr readpart move data to user's buffer.
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bvc XDOS.ReadDir repeat until request is satisfied.
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jsr rwdone update fcb as to new position.
bcc L43B6 branch if done with no errors.
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cmp #MLI.E.EOF was last read to end of file ?
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sec anticipate some other error.
bne L43B7 branch if not eof error.
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jsr svmark
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jsr XDOS.ZeroData clear out data block.
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ldy #$00 provide dummy back pointer for future
ldx XDOS.FCBPtr re-position. x = hi byte of last block
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L43A6 lda XDOS.FCBs+FCB.DBLK,x
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sta (ZP.DataPtr),y
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stz XDOS.FCBs+FCB.DBLK,x mark current block as impossible
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inx
iny inc indexes to do both hi and low bytes
cpy #$02
bne L43A6
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L43B6 clc no error
L43B7 rts
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L43B8 jmp errfix1 report how much xfer'd before error.
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*--------------------------------------
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mvcbytes ldy #$04 move request count to a more accessable location
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lda (ZP.A3L),y
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sta cbytes
sta rwreql
iny
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lda (ZP.A3L),y
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sta cbytes+1
sta rwreqh
ldy XDOS.FCBPtr return y = val(XDOS.FCBPtr),
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lda XDOS.FCBs+FCB.ACCESS,y a = attributes
* clc and carry clear...
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rts
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*--------------------------------------
XDOS.GetUserBuf ldy #$02 move the pointer to user's buffer
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lda (ZP.A3L),y to the block file manager
sta ZP.UserBuf z-page area
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iny
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lda (ZP.A3L),y
sta ZP.UserBuf+1
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XDOS.GetFCB.ST ldy XDOS.FCBPtr return storage type
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lda XDOS.FCBs+FCB.STYPE,y
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rts
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*--------------------------------------
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* this subroutine adds the requested byte count to mark and returns sum
* in scrtch and also returns mark in tpos and oldmark.
*
* on exit:
* y,x,a is unknown
* carry set indicates scrtch > eof
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*--------------------------------------
XDOS.CalcNewMark
ldx #$00
ldy XDOS.FCBPtr
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clc
.1 lda XDOS.FCBs+FCB.MARK,y
sta XDOS.TmpPos,x
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sta oldmark,x
adc cbytes,x
sta scrtch,x
txa
eor #$02 cbytes+2 always=0
beq eoftest
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iny
inx
bne .1 always.
*--------------------------------------
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eoftest lda scrtch,x new mark in scrtch.
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cmp XDOS.FCBs+FCB.EOF,y is new position > eof ?
bcc .1 no, proceed.
bne .1 yes, adjust 'cbytes' request
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dey
dex all tree bytes compared ?
bpl eoftest no, test next lowest
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.1 rts
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*--------------------------------------
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werreof jsr plus2fcb reset eof to pre-error position.
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L4418 lda oldeof,x place oldeof back into fcb
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sta XDOS.FCBs+FCB.EOF,y
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lda oldmark,x also reset mark to last best
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sta XDOS.FCBs+FCB.MARK,y write position
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sta scrtch,x and copy mark to scrtch for test of
dey eof less than mark.
dex
bpl L4418
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jsr plus2fcb get pointers to test eof < mark.
jsr eoftest carry set means mark > eof !!
* drop into wadjeof to adjust eof to mark if necessary
wadjeof jsr plus2fcb get y=XDOS.FCBPtr+2, x=2, a=y.
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L4434 lda XDOS.FCBs+FCB.EOF,y copy eof to old eof
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sta oldeof,x
bcc L4442 and if carry set...
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lda scrtch,x then copy scrtch to fcb's eof.
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sta XDOS.FCBs+FCB.EOF,y
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L4442 dey
dex copy all 3 bytes
bpl L4434
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rts
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plus2fcb lda #$02 on exit both a and y = XDOS.FCBPtr+2.
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tax x = 2
ora XDOS.FCBPtr
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tay
rts
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*--------------------------------------
XDOS.Write jsr mvcbytes first determine if requested write is legal.
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pha
jsr XDOS.CalcNewMark save a copy of eof to old eof, set/clr
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jsr wadjeof carry to determine if new mark > eof.
pla get attributes again.
and #$02 is write enabled ?
bne L4462 yes, continue...
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L445E lda #MLI.E.LOCKED illegal access error.
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bne L44A2
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L4462 jsr XDOS.TestWP otherwise, make sure device is not
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bcs L44A2 write protected. if so, branch to abort.
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lda cbytes
ora cbytes+1 anything to write ?
bne L4472 branch if so,
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jmp rwdone else do nothing.
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L4472 jsr XDOS.GetUserBuf move the user's buffer ptr to bfm zero
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cmp #$04 page area, also get storage type.
bcs L445E if not tree, return an access error.
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L4479 jsr rdposn
bcs L44A2
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jsr XDOS.GetFCBStatus
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and #$07
beq L44E9
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ldy #$00 is enough disk space available for
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L4487 iny indexes and data block ?
lsr
bne L4487
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sty reql
sta reqh
jsr XDOS.CheckFree
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bcs L44A2 pass back any errors.
2020-05-13 17:00:37 +00:00
2020-09-19 16:48:28 +00:00
jsr XDOS.GetFCBStatus now get more specific.
2019-10-16 06:09:13 +00:00
and #$04 are we lacking a tree top ?
beq L44AC no, test for lack of sapling level index
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2019-10-16 06:09:13 +00:00
jsr topdown go allocate tree top and adj file type.
bcc L44B8 continue with allocation of data block.
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
L44A2 pha save error.
jsr errfix1 error return.
jsr werreof adjust eof and mark to pre-error state.
pla restore error code.
sec
rts
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2020-09-18 15:06:12 +00:00
L44AC jsr XDOS.GetFCBStatus get status byte again.
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and #$02 do we need a sapling level index block ?
beq L44B8 no, assume it's just a data block needed
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2019-10-16 06:09:13 +00:00
jsr sapdown go alloc an indx blk and update tree top
bcs L44A2 if error.
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
L44B8 jsr alcwblk go allocate for data block.
bcs L44A2
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2020-09-18 15:06:12 +00:00
jsr XDOS.ClrFCBStatus clear allocation required bits in status
lda #FCB.F.IBLKMOD indicate index block is dirty.
jsr XDOS.SetFCBStatus
jsr XDOS.Tpos2Y now put block address into index block.
2019-10-16 06:09:13 +00:00
inc zpt+1 high byte first.
lda scrtch+1
tax
sta (zpt),y
dec zpt+1 restore pointer to lower page of index
lda scrtch block. get low block address.
sta (zpt),y store low address.
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ldy XDOS.FCBPtr update fcb to indicate that this block
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sta XDOS.FCBs+FCB.DBLK,y is allocated.
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txa get high address again.
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sta XDOS.FCBs+FCB.DBLK+1,y
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2019-10-16 06:09:13 +00:00
L44E9 jsr preprw
jsr wrtpart
bvc L4479
jmp rwdone update fcb with new position
wrtpart txa
bne L44FF branch if request is not even pages
lda rwreqh a call of 0 bytes should never get here!
beq L4546 do nothing
dec rwreqh
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2019-10-16 06:09:13 +00:00
L44FF dex
lda (ZP.UserBuf),y move data from user's buffer
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sta (sos),y
txa
beq L4525
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L4507 iny page crossed ?
bne L44FF no, keep moving.
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lda sos+1 test for end of buffer
inc ZP.UserBuf+1 but first adjust user buffer pointer
inc XDOS.TmpPos+1 and position
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bne L451C
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inc XDOS.TmpPos+2
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bne L451C
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lda #MLI.E.BEYEOF out of range if > 32MB
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bne L44A2
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2019-10-16 06:09:13 +00:00
L451C inc sos+1 adjust sos buffer high address
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eor ZP.DataPtr+1 (carry is undisturbed)
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beq L44FF branch if more to write to buffer.
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clv indicates not finished.
bvc L4549 always.
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L4525 lda rwreqh
beq L4539 branch if request satisfied.
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
iny done with this block of data ?
bne L4533 if not.
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
lda sos+1 this is necessary for proper
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eor ZP.DataPtr+1 adjustment of request count
2019-10-16 06:09:13 +00:00
bne L4536
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
L4533 dec rwreqh
L4536 dey reset modified y
bra L4507
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2019-10-16 06:09:13 +00:00
L4539 iny and position
bne L4546
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inc ZP.UserBuf+1 inc pointers
inc XDOS.TmpPos+1
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bne L4546
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inc XDOS.TmpPos+2
2020-09-17 15:29:41 +00:00
2019-10-16 06:09:13 +00:00
L4546 bit setvflg set v flag
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L4549 sty XDOS.TmpPos save low position
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stx rwreql and remainder of request count.
php save statuses
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lda #$50
jsr XDOS.SetFCBStatus
2019-10-16 06:09:13 +00:00
clc adjust user's low buffer address
lda XDOS.TmpPos
adc ZP.UserBuf
sta ZP.UserBuf
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bcc L4564
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inc ZP.UserBuf+1 adjust high address as needed.
2020-05-13 17:00:37 +00:00
L4564 jsr XDOS.SetFCB.DIRTY set directory flush bit.
2019-10-16 06:09:13 +00:00
plp restore return statuses
rts
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
topdown jsr swapdown make current 1st block an entry in new
bcs L45B1 top. branch if errors.
2020-05-13 17:00:37 +00:00
2023-11-05 15:26:06 +00:00
jsr XDOS.GetFCB.ST get storage type
2019-10-16 06:09:13 +00:00
* has storage type been changed to 'tree' ? if not, assume it was originally
* a seed and both levels need to be built. otherwise, only an index needs
* to be allocated.
cmp #$03 tree type
beq L457A
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2019-10-16 06:09:13 +00:00
jsr swapdown make previous swap a sap level index
bcs L45B1 block. branch if errors.
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
L457A jsr alcwblk get another block address for the sap
bcs L45B1 level index. branch if errors.
2020-05-13 17:00:37 +00:00
lda XDOS.TmpPos+2 calculate position of new index block
2019-10-16 06:09:13 +00:00
lsr in the top of the tree.
tay
lda scrtch get address of newly allocated index
tax block again.
sta (zpt),y
inc zpt+1
lda scrtch+1
sta (zpt),y save hi address
dec zpt+1
ldy XDOS.FCBPtr make newly allocated block the current
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sta XDOS.FCBs+FCB.IBLK+1,y index block.
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txa
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sta XDOS.FCBs+FCB.IBLK,y
2019-10-16 06:09:13 +00:00
jsr wfcbfst save new top of tree
bcs L45B1
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*--------------------------------------
2023-11-05 15:26:06 +00:00
XDOS.ZeroIndex lda #$00
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tay
2020-05-13 17:00:37 +00:00
2020-09-19 16:48:28 +00:00
inc zpt+1
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jsr .1
dec zpt+1
2019-10-16 06:09:13 +00:00
2023-11-05 15:26:06 +00:00
.1 sta (zpt),y
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iny
2023-11-05 15:26:06 +00:00
bne .1
2020-09-19 16:48:28 +00:00
rts
*--------------------------------------
2023-11-05 15:26:06 +00:00
sapdown jsr XDOS.GetFCB.ST find out if dealing with a tree.
2019-10-16 06:09:13 +00:00
cmp #$01 if seed then adj to file type is needed.
beq swapdown branch if seed
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
jsr rfcbfst otherwise read in top of tree.
bcc L457A if no error.
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
L45B1 rts return errors.
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*--------------------------------------
2019-10-16 06:09:13 +00:00
swapdown jsr alcwblk make current seed into a sapling, allocate a block before swap.
2020-09-17 15:29:41 +00:00
bcs .9 return errors.
2020-05-13 17:00:37 +00:00
ldy XDOS.FCBPtr get previous first block
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lda XDOS.FCBs+FCB.1stBLK,y address into index block.
2019-10-16 06:09:13 +00:00
pha save temporarily while swapping in new
lda scrtch top index. get new block address (low)
tax
2023-11-04 14:42:28 +00:00
sta XDOS.FCBs+FCB.1stBLK,y
lda XDOS.FCBs+FCB.1stBLK+1,y
2019-10-16 06:09:13 +00:00
pha
lda scrtch+1 and high address too
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sta XDOS.FCBs+FCB.1stBLK+1,y
sta XDOS.FCBs+FCB.IBLK+1,y make new top also the current index in
2019-10-16 06:09:13 +00:00
txa memory. get low address again.
2023-11-04 14:42:28 +00:00
sta XDOS.FCBs+FCB.IBLK,y
2019-10-16 06:09:13 +00:00
inc zpt+1 make previous the 1st entry in sub index
pla
sta (zpt)
dec zpt+1
pla
sta (zpt)
jsr wfcbfst save new file top.
2020-09-17 15:29:41 +00:00
bcs .9 if error.
2020-05-13 17:00:37 +00:00
2020-09-17 15:29:41 +00:00
lda #FCB.F.STMOD
jsr XDOS.SetFCBStatus
2019-10-16 06:09:13 +00:00
2023-11-04 14:42:28 +00:00
inc XDOS.FCBs+FCB.STYPE,x
2020-05-13 17:00:37 +00:00
2020-09-17 15:29:41 +00:00
* clc no error
.9 rts
*--------------------------------------
2023-11-12 13:20:15 +00:00
alcwblk jsr XDOS.GetFreeBlk
2020-09-17 15:29:41 +00:00
bcs .9
2020-05-13 17:00:37 +00:00
2020-09-17 15:29:41 +00:00
lda #FCB.F.UMOD
jsr XDOS.SetFCBStatus
2020-07-17 15:18:31 +00:00
2023-11-04 14:42:28 +00:00
inc XDOS.FCBs+FCB.UBLK,x
2020-09-17 15:29:41 +00:00
bne .9
2020-07-17 15:18:31 +00:00
2023-11-04 14:42:28 +00:00
inc XDOS.FCBs+FCB.UBLK+1,x
2019-10-16 06:09:13 +00:00
2020-09-17 15:29:41 +00:00
.9 rts
*--------------------------------------
2023-11-05 15:26:06 +00:00
XDOS.TestWP jsr XDOS.GetFCBStatus check for 'never been modified' condition
2019-10-16 06:09:13 +00:00
and #$F0
clc
2023-11-05 15:26:06 +00:00
bne XDOS.Tpos2Y.RTS ordinary rts if known write ok.
2020-05-13 17:00:37 +00:00
2020-09-19 16:48:28 +00:00
jsr XDOS.FCBDevIDSelect
2019-10-16 06:09:13 +00:00
2023-11-05 15:26:06 +00:00
XDOS.TestWPA sta ZP.UNITNUM make the device status call
2020-09-17 15:29:41 +00:00
2023-11-12 13:20:15 +00:00
lda ZP.BLKNUM
2019-10-16 06:09:13 +00:00
pha
2023-11-12 13:20:15 +00:00
lda ZP.BLKNUM+1 save the current block values
2019-10-16 06:09:13 +00:00
pha
2023-11-04 14:42:28 +00:00
stz ZP.CMDNUM
stz ZP.BLKNUM zero the block #
stz ZP.BLKNUM+1
2020-05-13 17:00:37 +00:00
2020-09-17 15:29:41 +00:00
jsr XDOS.DevCall
2019-10-16 06:09:13 +00:00
bcs .1 branch if write protect error
2020-05-13 17:00:37 +00:00
2019-10-16 06:09:13 +00:00
lda #$00 otherwise, assume no errors.
2020-05-13 17:00:37 +00:00
2023-11-05 15:26:06 +00:00
.1 jmp XDOS.PopBlkNumRTS restore the block #
*--------------------------------------
XDOS.Tpos2Y lda XDOS.TmpPos+2 get index to next block address
lsr
lda XDOS.TmpPos+1
ror
tay index to address = int(pos/512)
2023-11-05 15:26:06 +00:00
XDOS.Tpos2Y.RTS rts
2019-11-20 07:04:00 +00:00
*--------------------------------------
2019-10-16 06:09:13 +00:00
MAN
2020-05-23 18:45:32 +00:00
SAVE usr/src/prodos.fx/prodos.s.xdos.d
LOAD usr/src/prodos.fx/prodos.s
2019-10-16 06:09:13 +00:00
ASM