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50 lines
1.1 KiB
ArmAsm
50 lines
1.1 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 16.11.2002
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;
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; Scratch a file on disk
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;
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.export scratch
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.import opencmdchannel, closecmdchannel, writediskcmd
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.import fnunit, fnlen, fncmd
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.importzp ptr1
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.include "cbm.inc"
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;--------------------------------------------------------------------------
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; scratch: Scratch a file on disk. Expects the name of the file to be already
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; parsed. Returns an error code in A, which may either be the code read from
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; the command channel, or another error when accessing the command channel
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; failed.
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.proc scratch
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ldx fnunit
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jsr opencmdchannel
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bne done
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lda #'s' ; Scratch command
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sta fncmd
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lda #<fncmd
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sta ptr1
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lda #>fncmd
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sta ptr1+1
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ldx fnlen
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inx ; Account for "S"
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txa ; Length of name into A
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ldx fnunit ; Unit
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jsr writediskcmd
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pha
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ldx fnunit
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jsr closecmdchannel
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pla
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done: rts
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.endproc
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