mirror of https://github.com/A2osX/A2osX.git
580 lines
18 KiB
Plaintext
580 lines
18 KiB
Plaintext
NEW
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AUTO 3,1
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* read command
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readf jsr mvdbufr xfer buffer address and request count
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jsr mvcbytes to a more accessable location, also
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pha get fcb attributes and save on stack.
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jsr calcmrk calc mark after read, test if mark > eof
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pla carry set means end mark > eof.
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and #$01 test for read enabled.
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bne L41DE branch if ok to read.
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lda #$4E illegal access.
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bne L4202 always.
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L41DE bcc L4205 branch if result mark < eof. adjust
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ldy fcbptr request to read until just before eof.
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lda fcbbuf+21,y result = (eof-1) - position
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sbc tposll
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sta cbytes
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sta rwreql
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lda fcbbuf+22,y
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sbc tposlh
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sta cbytes+1
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sta rwreqh
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ora cbytes if both bytes = 0 then eof error
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bne L4210
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lda #$4C eof error
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L4202 jmp errfix1
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L4205 lda cbytes
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ora cbytes+1
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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.
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bcs L4202 branch if memory conflict.
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jsr gfcbstyp get storage type
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cmp #$04 and find out if it's a tree or other.
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bcc L421F branch if a tree file
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jmp dread otherwise assume it's a directory.
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L421F jsr rdposn set up data pointer.
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bcs L4202 errors.
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jsr preprw test for newline, setup for partial
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jsr readpart read. move current data buffer contents
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bvs L420D to user area. branch if satisfied.
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bcs L421F indicates newline is set.
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lda rwreqh how many blocks are to be read ?
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lsr if < 2 then use the slow way.
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beq L421F
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sta cmdtemp save bulk block count.
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jsr gfcbstat make sure current data area doesn't
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and #$40 need writing before resetting ptr to
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bne L421F read into user's area. branch if data
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sta ioaccess needs to be written to force 1st call
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lda usrbuf thru all dev handler checking. make
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sta datptr the data buffer the user's space.
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lda usrbuf+1
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sta datptr+1
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L4249 jsr rdposn get next block directly into user space.
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bcs L42B7 if error.
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L424E inc datptr+1 incll ptrs by one block (512 bytes)
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inc datptr+1
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dec rwreqh
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dec rwreqh
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inc tposlh
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inc tposlh
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bne L4269 if pos'n doesn't get to a 64k boundary
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inc tposhi otherwise, must check for a 128k one.
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lda tposhi carry set if 128k boundary reached.
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eor #$01
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lsr
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L4269 dec cmdtemp has all been read fast ?
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bne L427B branch if more to read.
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jsr fxdatptr go fix up data pointer to xdos buffer.
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lda rwreql test for end of read.
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ora rwreqh are both 0 ?
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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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lda tposhi get index to next block address
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lsr
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lda tposlh
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ror
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tay index to address = int(pos/512)
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lda (zpt),y get low address
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sta bloknml
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inc zpt+1
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cmp (zpt),y are hi and low address the same?
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bne L4299 no, it's a real block address.
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cmp #$00 are both bytes 0 ?
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bne L4299 no, must be real data.
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sta ioaccess don't do repeat io just after sparse.
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beq L429C branch always (carry set).
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L4299 lda (zpt),y get high address
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clc
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L429C dec zpt+1
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bcs L4249 if no block to read.
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sta bloknml+1
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lda ioaccess has 1st call gone to device yet ?
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beq L4249 no, go thru normal route
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clc
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php interrupts can't occur during dmgr call
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sei
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lda datptr+1 reset hi buffer address for dev handler
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sta buf+1
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jsr dmgr
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bcs L42B6 if error
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plp
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bcc L424E no errors, branch always.
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L42B6 plp restore interrupts.
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L42B7 pha save error code.
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jsr fxdatptr go restore data pointers, etc.
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pla
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errfix1 pha save error code
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jsr rwdone pass back # of bytes actually read
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pla
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sec error
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rts
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rwdone ldy #$06 return total # of bytes actually read
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sec derived from cbytes-rwreq.
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lda cbytes
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sbc rwreql
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sta (A3L),y
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iny
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lda cbytes+1
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sbc rwreqh
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sta (A3L),y
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jmp rdposn leave with valid position in fcb.
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preprw ldy fcbptr adj pointer to user's buffer to make
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sec the transfer
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lda usrbuf
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sbc tposll
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sta usrbuf
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bcs L42E9 if no adjustment to hi address needed
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dec usrbuf+1
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L42E9 lda fcbbuf+31,y test for new line enabled.
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clc
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beq L42F9 if new line not enabled.
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sec carry indicates new line enabled
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sta nlmask
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lda fcbbuf+10,y move newline character to more
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sta nlchar accesible spot.
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L42F9 ldy tposll index to 1st data.
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lda datptr reset low order of position pointer to
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sta sos beginning of page.
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ldx rwreql get low order count of requested bytes.
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rts return statuses.
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readpart txa x = low count of bytes to move.
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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!
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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
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sta (usrbuf),y
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bcs tstnewl test for newline 1st !
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L4316 txa note: x must be unchanged from tstnewl !
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beq L4332 go see if read request is satified...
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L4319 dex dec # of bytes left to move.
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iny page crossed ?
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bne L4310 no, move next byte.
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lda sos+1 test for end of buffer, but first
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inc usrbuf+1 adjust user buffer pointer
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inc tposlh and position
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bne L4329
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inc tposhi
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L4329 inc sos+1 and sos buffer high address.
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eor datptr+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.
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bvc L4360 always.
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L4332 lda rwreqh
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beq L4350 branch if request is satisfied.
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iny done with this block of data ?
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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 datptr+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
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bra L4319
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tstnewl lda (sos),y get last byte transferred again.
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and nlmask only bits on in mask are significant.
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eor nlchar does it match newline character?
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bne L4316 no, read next.
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L4350 iny adjust position.
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bne L435D
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inc usrbuf+1 inc pointers
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inc tposlh
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bne L435D
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inc tposhi
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L435D bit setvflg (sets v flag)
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L4360 sty tposll 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
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clc adjust user's low buffer address
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tya
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adc usrbuf
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sta usrbuf
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bcc L4374
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inc usrbuf+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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fxdatptr lda datptr put current user buffer address back to normal
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sta usrbuf
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lda datptr+1
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sta usrbuf+1 bank pair byte should be moved also.
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ldy fcbptr restore buffer address
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jmp fndfcbuf
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* read directory file
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dread jsr rdposn
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bcs L43B8 pass back any errors.
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jsr preprw prepare for transfer.
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jsr readpart move data to user's buffer.
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bvc dread repeat until request is satisfied.
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jsr rwdone update fcb as to new position.
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bcc L43B6 branch if done with no errors.
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cmp #$4C was last read to end of file ?
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sec anticipate some other error.
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bne L43B7 branch if not eof error.
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jsr svmark
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jsr zipdata clear out data block.
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ldy #$00 provide dummy back pointer for future
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ldx fcbptr re-position. x = hi byte of last block
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L43A6 lda fcbbuf+16,x
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sta (datptr),y
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lda #$00 mark current block as impossible
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sta fcbbuf+16,x
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inx
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iny inc indexes to do both hi and low bytes
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cpy #$02
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bne L43A6
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L43B6 clc no error
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L43B7 rts
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L43B8 jmp errfix1 report how much xfer'd before error.
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mvcbytes ldy #$04 move request count to a more accessable location
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lda (A3L),y
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sta cbytes
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sta rwreql
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iny
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lda (A3L),y
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sta cbytes+1
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sta rwreqh
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ldy fcbptr return y = val(fcbptr),
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lda fcbbuf+9,y a = attributes
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clc and carry clear...
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rts
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mvdbufr ldy #$02 move the pointer to user's buffer
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lda (A3L),y to the block file manager
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sta usrbuf z-page area
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iny
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lda (A3L),y
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sta usrbuf+1
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gfcbstyp ldy fcbptr return storage type
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lda fcbbuf+7,y
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rts
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* this subroutine adds the requested byte count to mark and returns sum
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* in scrtch and also returns mark in tpos and oldmark.
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*
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* on exit:
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* y,x,a is unknown
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* carry set indicates scrtch > eof
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calcmrk ldx #$00
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ldy fcbptr
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clc
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L43EE lda fcbbuf+18,y
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sta tposll,x
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sta oldmark,x
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adc cbytes,x
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sta scrtch,x
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txa
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eor #$02 cbytes+2 always=0
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beq eoftest
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iny
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inx
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bne L43EE always.
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eoftest lda scrtch,x new mark in scrtch.
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cmp fcbbuf+21,y is new position > eof ?
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bcc L4414 no, proceed.
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bne L4414 yes, adjust 'cbytes' request
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dey
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dex all tree bytes compared ?
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bpl eoftest no, test next lowest
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L4414 rts
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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 fcbbuf+21,y
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lda oldmark,x also reset mark to last best
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sta fcbbuf+18,y write position
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sta scrtch,x and copy mark to scrtch for test of
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dey eof less than mark.
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dex
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bpl L4418
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jsr plus2fcb get pointers to test eof < mark.
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jsr eoftest carry set means mark > eof !!
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* drop into wadjeof to adjust eof to mark if necessary
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wadjeof jsr plus2fcb get y=fcbptr+2, x=2, a=y.
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L4434 lda fcbbuf+21,y copy eof to old eof
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sta oldeof,x
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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 fcbbuf+21,y
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L4442 dey
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dex copy all 3 bytes
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bpl L4434
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rts
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plus2fcb lda #$02 on exit both a and y = fcbptr+2.
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tax x = 2
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ora fcbptr
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tay
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rts
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* write command
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writef jsr mvcbytes first determine if requested write is legal.
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pha
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jsr calcmrk save a copy of eof to old eof, set/clr
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jsr wadjeof carry to determine if new mark > eof.
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pla get attributes again.
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and #$02 is write enabled ?
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bne L4462 yes, continue...
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L445E lda #$4E illegal access error.
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bne L44A2
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L4462 jsr tstwprot 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
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ora cbytes+1 anything to write ?
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bne L4472 branch if so,
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jmp rwdone else do nothing.
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L4472 jsr mvdbufr move the user's buffer ptr to bfm zero
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cmp #$04 page area, also get storage type.
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bcs L445E if not tree, return an access error.
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L4479 jsr rdposn
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bcs L44A2
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jsr gfcbstat
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and #$07
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beq L44E9
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ldy #$00 is enough disk space available for
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L4487 iny indexes and data block ?
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lsr
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bne L4487
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sty reql
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sta reqh
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jsr tstfrblk
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bcs L44A2 pass back any errors.
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jsr gfcbstat now get more specific.
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and #$04 are we lacking a tree top ?
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beq L44AC no, test for lack of sapling level index
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jsr topdown go allocate tree top and adj file type.
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bcc L44B8 continue with allocation of data block.
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L44A2 pha save error.
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jsr errfix1 error return.
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jsr werreof adjust eof and mark to pre-error state.
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pla restore error code.
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sec
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rts
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L44AC jsr gfcbstat get status byte again.
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and #$02 do we need a sapling level index block ?
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beq L44B8 no, assume it's just a data block needed
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jsr sapdown go alloc an indx blk and update tree top
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bcs L44A2 if error.
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L44B8 jsr alcwblk go allocate for data block.
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bcs L44A2
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jsr gfcbstat clear allocation required bits in status
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ora #$80 but first indicate index block is dirty.
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and #$F8
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sta fcbbuf+8,y
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lda tposhi calculate position within index block.
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lsr
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lda tposlh
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ror
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tay now put block address into index block.
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inc zpt+1 high byte first.
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lda scrtch+1
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tax
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sta (zpt),y
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dec zpt+1 restore pointer to lower page of index
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lda scrtch block. get low block address.
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sta (zpt),y store low address.
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ldy fcbptr update fcb to indicate that this block
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sta fcbbuf+16,y is allocated.
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txa get high address again.
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sta fcbbuf+17,y
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L44E9 jsr preprw
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jsr wrtpart
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bvc L4479
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jmp rwdone update fcb with new position
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wrtpart txa
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bne L44FF branch if request is not even pages
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lda rwreqh a call of 0 bytes should never get here!
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beq L4546 do nothing
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dec rwreqh
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L44FF dex
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lda (usrbuf),y move data from user's buffer
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sta (sos),y
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txa
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beq L4525
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L4507 iny page crossed ?
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bne L44FF no, keep moving.
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lda sos+1 test for end of buffer
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inc usrbuf+1 but first adjust user buffer pointer
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inc tposlh and position
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bne L451C
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inc tposhi
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bne L451C
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lda #$4D out of range if > 32MB
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bne L44A2
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L451C inc sos+1 adjust sos buffer high address
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eor datptr+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.
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bvc L4549 always.
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L4525 lda rwreqh
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beq L4539 branch if request satisfied.
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iny done with this block of data ?
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bne L4533 if not.
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lda sos+1 this is necessary for proper
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eor datptr+1 adjustment of request count
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bne L4536
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L4533 dec rwreqh
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L4536 dey reset modified y
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bra L4507
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L4539 iny and position
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bne L4546
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inc usrbuf+1 inc pointers
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inc tposlh
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bne L4546
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inc tposhi
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L4546 bit setvflg set v flag
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L4549 sty tposll save low position
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stx rwreql and remainder of request count.
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php save statuses
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jsr gfcbstat
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ora #$50
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sta fcbbuf+8,y
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clc adjust user's low buffer address
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lda tposll
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adc usrbuf
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sta usrbuf
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bcc L4564
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inc usrbuf+1 adjust high address as needed.
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L4564 jsr fcbused set directory flush bit.
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plp restore return statuses
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rts
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topdown jsr swapdown make current 1st block an entry in new
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bcs L45B1 top. branch if errors.
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jsr gfcbstyp get storage type
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* has storage type been changed to 'tree' ? if not, assume it was originally
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* a seed and both levels need to be built. otherwise, only an index needs
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* to be allocated.
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cmp #$03 tree type
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beq L457A
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jsr swapdown make previous swap a sap level index
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bcs L45B1 block. branch if errors.
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L457A jsr alcwblk get another block address for the sap
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bcs L45B1 level index. branch if errors.
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lda tposhi calculate position of new index block
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lsr in the top of the tree.
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tay
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lda scrtch get address of newly allocated index
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tax block again.
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sta (zpt),y
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inc zpt+1
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lda scrtch+1
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sta (zpt),y save hi address
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dec zpt+1
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ldy fcbptr make newly allocated block the current
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sta fcbbuf+15,y index block.
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txa
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sta fcbbuf+14,y
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jsr wfcbfst save new top of tree
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bcs L45B1
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jmp zeroindex zero index block in user's i/o buffer.
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sapdown jsr gfcbstyp find out if dealing with a tree.
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cmp #$01 if seed then adj to file type is needed.
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beq swapdown branch if seed
|
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jsr rfcbfst otherwise read in top of tree.
|
||
bcc L457A if no error.
|
||
L45B1 rts return errors.
|
||
|
||
swapdown jsr alcwblk make current seed into a sapling, allocate a block before swap.
|
||
bcs L45F6 return errors.
|
||
ldy fcbptr get previous first block
|
||
lda fcbbuf+12,y address into index block.
|
||
pha save temporarily while swapping in new
|
||
lda scrtch top index. get new block address (low)
|
||
tax
|
||
sta fcbbuf+12,y
|
||
lda fcbbuf+13,y
|
||
pha
|
||
lda scrtch+1 and high address too
|
||
sta fcbbuf+13,y
|
||
sta fcbbuf+15,y make new top also the current index in
|
||
txa memory. get low address again.
|
||
sta fcbbuf+14,y
|
||
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.
|
||
bcs L45F6 if error.
|
||
jsr gfcbstyp now adjust storage type by adding 1
|
||
adc #$01 (seed becomes sapling becomes tree)
|
||
sta fcbbuf+7,y
|
||
lda fcbbuf+8,y mark storage type modified
|
||
ora #$08
|
||
sta fcbbuf+8,y
|
||
clc no error
|
||
L45F6 rts
|
||
|
||
alcwblk jsr alc1blk
|
||
bcs L4616
|
||
jsr gfcbstat mark usage as modified
|
||
ora #$10
|
||
sta fcbbuf+8,y
|
||
lda fcbbuf+24,y inc current usage count by 1
|
||
clc
|
||
adc #$01
|
||
sta fcbbuf+24,y
|
||
lda fcbbuf+25,y
|
||
adc #$00
|
||
sta fcbbuf+25,y
|
||
L4615 clc no error
|
||
L4616 rts
|
||
|
||
tstwprot jsr gfcbstat check for 'never been modified' condition
|
||
and #$F0
|
||
bne L4615 ordinary rts if known write ok.
|
||
lda fcbbuf+1,y get file's dev #.
|
||
sta devnum get current status of block device.
|
||
|
||
twrprot1 sta unitnum make the device status call
|
||
lda bloknml+1
|
||
pha
|
||
lda bloknml save the current block values
|
||
pha
|
||
stz A4L
|
||
stz bloknml zero the block #
|
||
stz bloknml+1
|
||
php
|
||
sei
|
||
jsr dmgr
|
||
bcs .1 branch if write protect error
|
||
lda #$00 otherwise, assume no errors.
|
||
.1 plp restore interrupt status
|
||
clc
|
||
tax save error.
|
||
beq .2 branch if no error
|
||
sec else, set carry to show error.
|
||
.2 pla
|
||
sta bloknml restore the block #
|
||
pla
|
||
sta bloknml+1
|
||
txa
|
||
rts carry is indeterminate.
|
||
|
||
MAN
|
||
SAVE usr/src/prodos.203/prodos.s.xdos.d
|
||
LOAD usr/src/prodos.203/prodos.s
|
||
ASM
|