159 lines
2.3 KiB
ArmAsm
159 lines
2.3 KiB
ArmAsm
; Native: Shawn Jefferson, December 2005
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; POSIX: Stefan Haubenthal, April 2008
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.include "atari.inc"
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.export _opendir, _readdir, _closedir
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.import findfreeiocb, clriocb
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.import __oserror, return0, __do_oserror
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.importzp ptr1, tmp1
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.ifdef DEFAULT_DEVICE
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.import __defdev
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.endif
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.proc _opendir
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sta ptr1
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stx ptr1+1
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jsr findfreeiocb
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beq @iocbok
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bne cioerr
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@iocbok: stx diriocb
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jsr clriocb
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ldx diriocb
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ldy #0 ; '.' -> "D:*.*"
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lda (ptr1),y
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cmp #'.'
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bne @use_parm
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; "." was given as parameter, use default device/dir
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.ifdef DEFAULT_DEVICE
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; construct a "Dn:*.*" like string from the default drive
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lda __defdev+1
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sta dddefdev+1 ; copy drive number (overwrite 2nd 'D')
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lda #<dddefdev
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sta ICBAL,x
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lda #>dddefdev
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sta ICBAH,x
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bne @cont
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.else
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lda #<defdev
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sta ICBAL,x
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lda #>defdev
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sta ICBAH,x
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bne @cont
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.endif
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@use_parm: lda ptr1
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sta ICBAL,x
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lda ptr1+1
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sta ICBAH,x
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@cont: lda #OPEN
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sta ICCOM,x
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lda #OPNIN|DIRECT
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sta ICAX1,x
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jsr CIOV
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bmi cioerr
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lda #0
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sta __oserror
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tax
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lda diriocb
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rts
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.endproc
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cioerr: sty __oserror
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jmp return0
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.proc _readdir
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tax
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lda #GETREC
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sta ICCOM,x
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lda #<entry
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sta ICBAL,x
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sta ptr1
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lda #>entry
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sta ICBAH,x
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sta ptr1+1
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lda #DSCTSZ
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sta ICBLL,x
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lda #0
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sta ICBLH,x
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jsr CIOV
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bmi cioerr
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ldy #0 ; FREE SECTORS
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lda (ptr1),y
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cmp #'0'
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bcs cioerr
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dey
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@next: iny ; remove trailing spaces
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iny
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iny
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lda (ptr1),y
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dey
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dey
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sta (ptr1),y
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cpy #9
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bcs @break
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cmp #' '
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bne @next
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@break: lda #'.' ; extension dot
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sta (ptr1),y
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iny ; copy extension
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sty tmp1
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ldy #10
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lda (ptr1),y
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cmp #' '
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bne @hasext
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; no extension present: remove the trailing dot and be done
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ldy tmp1
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dey
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bne @done
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@hasext: jsr copychar
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ldy #11
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jsr copychar
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ldy #12
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jsr copychar
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@done: lda #0 ; end of string
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sta (ptr1),y
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lda ptr1
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ldx ptr1+1
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rts
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copychar: lda (ptr1),y ; src=y dest=tmp1
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ldy tmp1
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cmp #' '
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beq @break
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sta (ptr1),y
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iny
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sty tmp1
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@break: rts
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.endproc
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.proc _closedir
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tax
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lda #CLOSE
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sta ICCOM,x
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jsr CIOV
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bmi @cioerr
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ldx #0
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stx __oserror ; clear system specific error code
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txa
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rts
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@cioerr: jmp __do_oserror
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.endproc
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.data
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.ifdef DEFAULT_DEVICE
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dddefdev: .byte "D"
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.endif
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defdev: .asciiz "D:*.*"
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.bss
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diriocb: .res 1
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entry: .res DSCTSZ
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