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194 lines
4.7 KiB
ArmAsm
194 lines
4.7 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 16.11.2002
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;
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; File name handling for CBM file I/O
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;
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.export fnparse, fnparsename, fnset
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.export fnadd, fnaddmode, fncomplete, fndefunit
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.export fnunit, fnlen, fnisfile, fncmd, fnbuf
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.import SETNAM
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.import __curunit, __filetype
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.importzp ptr1, tmp1
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.include "ctype.inc"
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;------------------------------------------------------------------------------
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; fnparsename: Parse a filename (without drive spec) passed in in ptr1 and y.
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.proc fnparsename
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lda #0
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sta tmp1 ; Remember length of name
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nameloop:
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lda (ptr1),y ; Get next char from filename
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beq namedone ; Jump if end of name reached
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; Check the maximum length, store the character
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ldx tmp1
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cpx #16 ; Maximum length reached?
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bcs invalidname
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lda (ptr1),y ; Reload char
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jsr fnadd ; Add character to name
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iny ; Next char from name
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inc tmp1 ; Increment length of name
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bne nameloop ; Branch always
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; Invalid file name
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invalidname:
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lda #33 ; Invalid file name
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; Done, we've successfully parsed the name.
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namedone:
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rts
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.endproc
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;------------------------------------------------------------------------------
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; fnparse: Parse a full filename passed in in a/x. Will set the following
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; variables:
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;
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; fnlen -> length of filename
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; fnbuf -> filename including drive spec
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; fnunit -> unit from spec or default unit
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;
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; Returns an error code in A or zero if all is ok.
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.proc fnparse
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sta ptr1
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stx ptr1+1 ; Save pointer to name
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; For now we will always use the default unit
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jsr fndefunit
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; Check the name for a drive spec
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ldy #0
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lda (ptr1),y
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cmp #'0'
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beq digit
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cmp #'1'
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bne nodrive
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digit: sta fnbuf+0
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iny
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lda (ptr1),y
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cmp #':'
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bne nodrive
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; We found a drive spec, copy it to the buffer
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sta fnbuf+1
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iny ; Skip colon
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bne drivedone ; Branch always
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; We did not find a drive spec, always use drive zero
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nodrive:
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lda #'0'
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sta fnbuf+0
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lda #':'
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sta fnbuf+1
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ldy #$00 ; Reposition to start of name
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; Drive spec done. We do now have a drive spec in the buffer.
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drivedone:
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lda #2 ; Length of drive spec
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sta fnlen
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; Assume this is a standard file on disk
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sta fnisfile
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; Special treatment for directory. If the file name is "$", things are
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; actually different: $ is directory for unit 0, $0 dito, $1 is directory
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; for unit 1. For simplicity, we won't check anything else if the first
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; character of the file name is '$'.
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lda (ptr1),y ; Get first character
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cmp #'$' ;
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bne fnparsename
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; Juggle stuff
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ldx fnbuf+0 ; unit
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stx fnbuf+1
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sta fnbuf+0
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; No need to check the name. Length is already 2
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lda #0 ; ok flag
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sta fnisfile ; This is not a real file
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rts
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.endproc
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;--------------------------------------------------------------------------
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; fndefunit: Use the default unit
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.proc fndefunit
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lda __curunit
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sta fnunit
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rts
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.endproc
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;--------------------------------------------------------------------------
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; fnset: Tell the kernal about the file name
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.proc fnset
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lda fnlen
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ldx #<fnbuf
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ldy #>fnbuf
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jmp SETNAM
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.endproc
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;--------------------------------------------------------------------------
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; fncomplete: Complete a filename by adding ",t,m" where t is the file type
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; and m is the access mode passed in in the A register
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;
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; fnaddmode: Add ",m" to a filename, where "m" is passed in A
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fncomplete:
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pha ; Save mode
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lda __filetype
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jsr fnaddmode ; Add the type
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pla
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fnaddmode:
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pha
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lda #','
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jsr fnadd
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pla
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fnadd: ldx fnlen
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inc fnlen
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sta fnbuf,x
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rts
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;--------------------------------------------------------------------------
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; Data
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.bss
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fnunit: .res 1
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fnlen: .res 1
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fnisfile: .res 1 ; Flags standard file (as opposed to "$")
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.data
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fncmd: .byte 's' ; Use as scratch command
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fnbuf: .res 35 ; Either 0:0123456789012345,t,m
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; Or 0:0123456789012345=0123456789012345
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