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passport/src/mli.a

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; MLI command codes
CMD_CREATE = $C0 ; create new file
CMD_DESTROY = $C1 ; delete a file
CMD_SETPREFIX = $C6 ; change default pathname prefix
CMD_OPEN = $C8 ; open a file
CMD_NEWLINE = $C9 ; set line-by-line read mode
CMD_READ = $CA ; read an open file
CMD_WRITE = $CB ; write to an open file
CMD_CLOSE = $CC ; close an open file
CMD_SETMARK = $CE ; change position in an open file
; MLI parameter counts
PC_CREATE = $07
PC_DESTROY = $01
PC_SETPREFIX = $01
PC_OPEN = $03
PC_NEWLINE = $03
PC_READ = $04
PC_WRITE = $04
PC_CLOSE = $01
PC_SETMARK = $02
PRODOSMLI = $BF00 ; [callable] MLI entry point
; MLI error codes
ERR_FNF = $46
ERR_EOF = $4C
;-------------------------------
; WriteTrackMLI - write the contents of
; BASEPAGE data buffer to disk
; in: @SLOT contains (slot x 16) + $30
; @DRIVE contains drive + $30
; @gTrack contains track number
; @BASEPAGE contains data to write ($1000 bytes)
; out: if C set, write failed (A contains MLI error code)
; if C clear, write succeeded (A is clobbered)
; all other flags clobbered
; all registers clobbered
;-------------------------------
WriteTrackMLI
jsr SwapProDOS
jsr ReorderBuffer
lda #$81 ; 'write block' command
sta mlicmd
lda DRIVE ; ProDOS "unit number" is
sec
sbc #$30
lsr ; DSSS0000, where D is the
asl ; drive number (0=drive 1,
asl ; 1=drive 2) and SSS is
asl ; the slot number (1-7).
asl ; "Beneath Apple ProDOS"
asl ; page 6-19
asl
asl
sta mliparam+1
lda SLOT
sec
sbc #$30
asl
asl
asl
asl
clc
adc mliparam+1
sta mliparam+1
lda #$00
sta mliparam+2 ; lo byte of data buffer
lda #$08
sta blockcount
lda gTrack
asl
asl
asl
sta mliparam+4 ; lo byte of block number
rol
and #$01
sta mliparam+5 ; hi byte of block number
lda #BASEPAGE ; hi byte of data buffer
sta mliparam+3
writeloop
lda mlicmd
ldy #$03 ; parameter count
jsr mli
bcs mli_writeerr
inc mliparam+3 ; 2 pages per block
inc mliparam+3
inc mliparam+4
dec blockcount
bne writeloop
clc
bcc writedone
mli_writeerr
writedone
php
pha
jsr ReorderBuffer
jsr SwapProDOS
pla
plp
rts
blockcount !byte $FF
;-------------------------------
; ReorderBuffer - convert data
; buffer between ProDOS and
; DOS 3.3 ordering (use after
; read or before write under
; ProDOS)
; in: none
; out: all flags clobbered
; all registers clobbered
; @cmp1, @cmp2 clobbered
;-------------------------------
ReorderBuffer
lda #$00
sta cmp1
sta cmp2
tay
lda #$01
clc
adc #BASEPAGE
sta cmp1+1
lda #$0E
clc
adc #BASEPAGE
sta cmp2+1
ldx #$07
L lda (cmp1),y
pha
lda (cmp2),y
sta (cmp1),y
pla
sta (cmp2),y
iny
bne L
inc cmp1+1
dec cmp2+1
dex
bne L
rts
;-------------------------------
; SaveFile1Shot
; save a file to disk all at once,
; using ProDOS MLI calls
;
; in: stack contains 11 ($0B) bytes of parameters:
; +1 address of pathname
; +3 [byte] file type
; +4 [word] aux file type
; +6 address of data buffer
; +8 [word] length of data buffer
; +A address of ProDOS file buffer
; out: if C set, save failed and A contains error code
; from open or write
; if C clear, save succeeded
; all other flags clobbered
; all registers clobbered
; stack set to next instruction after parameters
;-------------------------------
SaveFile1Shot
pla
sta $00
pla
sta $01
tax
lda #$0B
clc
adc $00
bcc mli_noinc1
inx
mli_noinc1
tay
txa
pha
tya
pha
ldy #$01
lda ($00),y ; lo byte of pathname
sta mliparam+1
iny
lda ($00),y ; hi byte of pathname
sta mliparam+2
jsr DeleteFile ; don't care if this fails
ldy #$03
lda ($00),y ; file type
sta mliparam+4
iny
lda ($00),y ; lo byte of aux file type
sta mliparam+5
iny
lda ($00),y ; hi byte of aux file type
sta mliparam+6
jsr CreateFile
bcs savefile1s
ldy #$0A
lda ($00),y ; lo byte of ProDOS file buffer
sta mliparam+3
iny
lda ($00),y ; hi byte of ProDOS file buffer
sta mliparam+4
jsr OpenFile
bcs savefile1s
pha ; push file reference number
ldy #$06
lda ($00),y ; lo address of data buffer
sta mliparam+2
iny
lda ($00),y ; hi address of data buffer
sta mliparam+3
iny
lda ($00),y ; lo data length
sta mliparam+4
iny
lda ($00),y ; hi data length
sta mliparam+5
pla ; pull file reference number
jsr WriteFile
php ; save flags from writefile
pha
jsr CloseFile ; always close whether write worked or not
pla
plp ; restore flags from write
; (so caller gets codes from write attempt,
; not close)
savefile1s
rts
;-------------------------------
; LoadFile1Shot
; load a file into memory all at once,
; using ProDOS MLI calls
;
; in: stack contains 8 bytes of parameters:
; +1 address of pathname
; +3 address of data buffer (to receive file contents)
; +5 [word] maximum length of data to read
; +7 address of ProDOS file buffer
; out: if C set, load failed and A contains error code
; from open or read
; if C clear, load succeeded and ($02) contains
; data loaded from file
; all other flags clobbered
; all registers clobbered
; stack set to next instruction after parameters
;-------------------------------
LoadFile1Shot
pla
sta $00
pla
sta $01
tax
lda #$08
clc
adc $00
bcc mli_noinc2
inx
mli_noinc2
tay
txa
pha
tya
pha
ldy #$01
lda ($00),y ; lo byte of pathname
sta mliparam+1
iny
lda ($00),y ; hi byte of pathname
sta mliparam+2
ldy #$07
lda ($00),y ; lo byte of ProDOS file buffer
sta mliparam+3
iny
lda ($00),y ; hi byte of ProDOS file buffer
sta mliparam+4
jsr OpenFile
bcs loadfile1s ; C set on error
pha ; push file reference number
ldy #$03
lda ($00),y ; lo address of data buffer
sta mliparam+2
iny
lda ($00),y ; hi address of data buffer
sta mliparam+3
iny
lda ($00),y ; lo data length
sta mliparam+4
iny
lda ($00),y ; hi data length
sta mliparam+5
pla ; pull file reference number
jsr ReadFile
php ; save flags from readfile
pha
jsr CloseFile ; always close whether read worked or not
pla
plp ; restore flags from readfile
; (so caller gets codes from read attempt,
; not close)
loadfile1s
rts
;-------------------------------
; open file via ProDOS MLI
;
; in: caller has filled @mliparam with address of
; pathname, address of data buffer, and maximum
; data length
; A = file reference number
; out: if C set, open failed and A contains error code
; if C clear, open succeeded and A contains
; file reference number
;-------------------------------
OpenFile
lda #CMD_OPEN ; MLI command
ldy #PC_OPEN ; number of parameters for 'open' command
jsr mli
bcs openfile
lda refnum ; caller should save file reference number
; as this memory location may be
; overwritten by later MLI calls
openfile
rts
;-------------------------------
; set line-by-line mode via ProDOS MLI
;
; in: A = file reference number
; out: if C set, set failed and A contains error code
; if S clear, set succeeded and A contains the same
; file reference number that was passed in
;-------------------------------
lbl_mask = $7F
lbl_cr = $0D
SetLineByLine
sta mliparam+1 ; store file reference number
lda #lbl_mask ; accept high bit set or clear
sta mliparam+2
lda #lbl_cr ; carriage return character
sta mliparam+3
lda #CMD_NEWLINE ; MLI 'newline' command to set read mode
ldy #PC_NEWLINE ; number of parameters for 'newline' command
jsr mli
bcs setlinebylin
lda mliparam+1 ; if no error, return file reference number
setlinebylin
rts
;-------------------------------
; read an open file via ProDOS MLI
;
; in: A = file reference number
; caller has filled @mliparam with address of
; data buffer and maximum data length
; out: if C set, read failed and A contains error code
; if C clear, read succeeded and A contains the same
; file reference number that was passed in
;-------------------------------
ReadFile
sta mliparam+1 ; store file reference number
lda #CMD_READ ; MLI read command
ldy #PC_READ ; number of parameters for 'read' command
jsr mli
bcs readfile
lda mliparam+1 ; if no error, return file reference number
readfile
rts
;-------------------------------
; change file position in an open file via ProDOS MLI
;
; in: A = file reference number
; caller has filled @mliparam+2/+3/+4 with
; new file position
; out: if C set, set_mark call failed and A contains error code
; if C clear, set_mark call succeeded and A contains
; the same file reference number that was passed in
;-------------------------------
SetMark
sta mliparam+1 ; store file reference number
lda #CMD_SETMARK ; MLI set_mark command
ldy #PC_SETMARK ; number of params for 'set_mark' cmd
jsr mli
bcs mli_exit
lda mliparam+1 ; if no error, return file refnum
mli_exit rts
;-------------------------------
; write to an open file via ProDOS MLI
;
; in: A = file reference number
; caller has filled @mliparam with address of
; data buffer and data length
; out: if C set, write failed and A contains error code
; if C clear, write succeeded and A contains the same
; file reference number that was passed in
;-------------------------------
WriteFile
sta mliparam+1 ; store file reference number
lda #CMD_WRITE ; MLI write command
ldy #PC_WRITE ; number of parameters for 'write' command
jsr mli
bcs writefile
lda mliparam+1 ; if no error, return file reference number
writefile
rts
;-------------------------------
; close an open file
; in: A = file reference number
; out: if error, C set and A contains error code
; if success, C clear
;-------------------------------
CloseFile
sta mliparam+1 ; store file reference number
lda #CMD_CLOSE ; MLI close command
ldy #PC_CLOSE ; number of parameters for 'close' command
jsr mli
rts
;-------------------------------
; create a file via ProDOS MLI
; always sets access bits to $C3 (full access)
; always sets creation to 0 (current date/time)
; always sets storage type to 1 (file)
; in: caller has filled @mliparam
; with address of pathname,
; file type, aux file type
; out: if error, C set and A contains error code
; if success, C clear
;-------------------------------
accessbits = $C3 ; full access
CreateFile
lda #accessbits
sta mliparam+3 ; access bits (full access)
lda #1
sta mliparam+7 ; storage type (file)
lda #0
sta mliparam+8 ; creation date (current)
sta mliparam+9
sta mliparam+10 ; creation time (current)
sta mliparam+11
lda #CMD_CREATE ; MLI create command
ldy #PC_CREATE ; number of parameters for 'create' command
jsr mli
rts
;-------------------------------
; delete a file using ProDOS MLI
; in: caller has filled @mliparam
; with address of pathname
; out: if error, C set and A contains error code
; if success, C clear
;-------------------------------
DeleteFile
lda #CMD_DESTROY ; MLI destroy command
ldy #PC_DESTROY ; number of parameters for 'destroy' command
jsr mli
rts
;-------------------------------
; change current directory (set prefix)
; using ProDOS MLI
; in: caller has filled @mliparam
; with address of pathname
; out: if error, C set and A contains error code
; if success, C clear
;-------------------------------
SetPrefix
lda #CMD_SETPREFIX
ldy #PC_SETPREFIX
jsr mli
rts
;-------------------------------
; low-level MLI wrapper
; in: A = MLI command code
; Y = number of MLI parameters
; caller has filled @mliparam
; with all relevant parameters
; out: returns immediately after
; calling MLI, so whatever
; state the MLI routine sets,
; the caller will see it
; verbatim
;-------------------------------
mli sta mlicmd ; store command code
sty mliparam ; number of parameters
jsr PRODOSMLI ; call ProDOS
mlicmd !byte 00 ; command number
!word mliparam ; address of parameter table
rts
mliparam !byte $FE,$FE,$FE,$FE,$FE
refnum !byte $FE ; file refnum (set by MLI open)
mlilen !byte $FE,$FE ; file length (set by MLI read)
!byte $FE,$FE,$FE,$FE
; used by createfile
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