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98 lines
2.0 KiB
ArmAsm
98 lines
2.0 KiB
ArmAsm
;
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; Oliver Schmidt, 30.12.2004
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;
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; File name handling for ProDOS 8 file I/O
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;
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.export pushname, popname
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.import subysp, addysp, decsp1
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.include "zeropage.inc"
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.include "mli.inc"
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pushname:
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sta ptr1
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stx ptr1+1
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; Alloc pathname buffer
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ldy #64+1 ; Max pathname length + zero
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jsr subysp
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; Check for full pathname
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ldy #$00
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lda (ptr1),y
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cmp #'/'
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beq copy
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; Check for system prefix
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lda PFIXPTR
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bne copy
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; Use unit number of most recent accessed device
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lda DEVNUM
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sta mliparam + MLI::ON_LINE::UNIT_NUM
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; Use allocated pathname buffer
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lda sp
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ldx sp+1
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sta mliparam + MLI::ON_LINE::DATA_BUFFER
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stx mliparam + MLI::ON_LINE::DATA_BUFFER+1
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; Get volume name
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lda #ON_LINE_CALL
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ldx #ON_LINE_COUNT
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jsr callmli
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bcs addsp65
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; Get volume name length
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lda (sp),y
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and #15 ; Max volume name length
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; Bracket volume name with slashes to form prefix
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sta tmp1
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lda #'/'
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sta (sp),y
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ldy tmp1
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iny ; Leading slash
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sta (sp),y
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iny ; Trailing slash
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; Adjust source pointer for copy
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sty tmp1
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lda ptr1
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sec
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sbc tmp1
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bcs :+
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dec ptr1+1
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: sta ptr1
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; Copy source to allocated pathname buffer
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copy: lda (ptr1),y
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sta (sp),y
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beq setlen
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iny
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cpy #64+1 ; Max pathname length + zero
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bcc copy
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; Load oserror code
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lda #$40 ; "Invalid pathname"
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; Free pathname buffer
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addsp65:ldy #64+1
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bne addsp ; Branch always
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; Alloc and set length byte
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setlen: tya
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jsr decsp1 ; Preserves A
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ldy #$00
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sta (sp),y
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; Return success
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tya
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rts
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popname:
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; Cleanup stack
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ldy #1 + 64+1 ; Length byte + max pathname length + zero
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addsp: jmp addysp ; Preserves A
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