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171 lines
3.9 KiB
ArmAsm
171 lines
3.9 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, fnset, fnaddmode, fncomplete
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.export fnunit, fnlen, fncmd, fnbuf
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.import SETNAM
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.import __curunit, __filetype
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.importzp ptr1
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.include "ctype.inc"
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;--------------------------------------------------------------------------
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; fnparse: Parse a 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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.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're always using the default unit
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lda __curunit
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sta fnunit
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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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sta fnbuf+0
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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: 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. Copy the name into the file name buffer. Check that all
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; file name characters are valid and that the maximum length is not exceeded.
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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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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 for valid chars in the file name. We allow letters, digits, plus some
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; additional chars from a table.
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ldx #fncharcount-1
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namecheck:
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cmp fnchars,x
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beq nameok
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dex
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bpl namecheck
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tax
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lda __ctype,x
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and #CT_ALNUM
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beq invalidname
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; Check the maximum length, store the character
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nameok: ldx fnlen
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cpx #18 ; 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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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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; 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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jsr fnaddcomma ; Add a comma
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lda __filetype
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jsr fnadd ; Add the type
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pla
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fnaddmode:
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pha
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jsr fnaddcomma
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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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fnaddcomma:
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lda #','
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bne fnadd
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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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.data
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fncmd: .byte 's' ; Use as scratch command
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fnbuf: .res 22 ; 0:0123456789012345,t,m
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.rodata
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; Characters that are ok in filenames besides digits and letters
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fnchars:.byte ".,-_+()"
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fncharcount = *-fnchars
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