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218 lines
3.2 KiB
ArmAsm
218 lines
3.2 KiB
ArmAsm
; get arguments from command line (when DOS supports it)
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; and supply function to get default device: char *getdefdev(void);
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; Freddy Offenga, 4/21/2000
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; SpartaDOS:
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; the ZCRNAME routine is only used to get the default drive because
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; ZCRNAME has two disadvantages:
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; 1. It will convert D: into D1: instead of Dn: (n = default drive)
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; 2. It will give a 'no arguments' status if it detects something
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; like Dn: (without filename).
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; OS/A+ DOS:
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; ZCRNAME is slightly different from SpartaDOS. It will convert D:
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; into Dn: where n is the default drive.
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MAXARGS = 16 ; max. amount of arguments in arg. table
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CL_SIZE = 64 ; command line buffer size
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SPACE = 32 ; SPACE char.
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.include "atari.inc"
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.export getargs, argc, argv
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.export _getdefdev ; get default device (e.g. "D1:")
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.importzp ptr1
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; Get command line
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getargs:
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lda #0
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sta argc
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sta argc+1
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sta argv
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sta argv+1
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jsr detect
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bcs argdos ; carry set = DOS supports arguments
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rts
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; Initialize ourcl buffer
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argdos: lda #ATEOL
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sta ourcl+CL_SIZE
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; Move SpartaDOS command line to our own buffer
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lda DOSVEC
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clc
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adc #<LBUF
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sta ptr1
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lda DOSVEC+1
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adc #>LBUF
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sta ptr1+1
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ldy #0
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cpcl: lda (ptr1),y
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sta ourcl,y
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iny
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cmp #ATEOL
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beq movdon
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cpy #CL_SIZE
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bne cpcl
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movdon: lda #0
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sta ourcl,y ; null terminate behind ATEOL
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; Get default device (LBUF will be destroyed!!)
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ldy #BUFOFF
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lda #0
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sta (DOSVEC),y ; reset buffer offset
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; Store dummy argument
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ldy #LBUF
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lda #'X'
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sta (DOSVEC),y
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iny
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lda #ATEOL
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sta (DOSVEC),y
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; One extra store to avoid the buggy sequence from OS/A+ DOS:
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; <D><RETURN><:> => drive number = <RETURN>
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iny
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sta (DOSVEC),y
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; Create crunch vector
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ldy #ZCRNAME+1
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lda (DOSVEC),y
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sta crvec+1
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iny
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lda (DOSVEC),y
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sta crvec+2
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crvec: jsr $FFFF ; will be set to crunch vector
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; Get default device
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ldy #COMFNAM ; COMFNAM is always "Dn:"
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lda (DOSVEC),y
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sta defdev
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iny
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lda (DOSVEC),y
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sta defdev+1
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; Turn command line into argv table
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ldy #0
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eatspc: lda ourcl,y ; eat spaces
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cmp #ATEOL
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beq finargs
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cmp #SPACE
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bne rpar ; begin of argument found
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iny
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cpy #CL_SIZE
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bne eatspc
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beq finargs ; only spaces is no argument
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; Store argument vector
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rpar: lda argc ; low-byte
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asl
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tax ; table index
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tya ; ourcl index
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clc
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adc #<ourcl
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sta argv,x
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lda #>ourcl
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adc #0
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sta argv+1,x
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ldx argc
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inx
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stx argc
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cpx #MAXARGS
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beq finargs
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; Skip this arg.
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skiparg:
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ldx ourcl,y
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cpx #ATEOL ; end of line?
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beq eopar
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cpx #SPACE
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beq eopar
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iny
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cpy #CL_SIZE
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bne skiparg
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; End of arg. -> place 0
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eopar:
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lda #0
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sta ourcl,y
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iny ; y behind arg.
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cpx #ATEOL ; was it the last arg?
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bne eatspc
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; Finish args
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finargs:
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lda argc
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asl
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tax
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lda #0
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sta argv,x
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sta argv+1,x
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rts
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; DOS type detection
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detect:
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lda DOS
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cmp #$53 ; "S" (SpartaDOS)
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beq spdos
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ldy #COMTAB
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lda #$4C
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cmp (DOSVEC),y
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bne nordos
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ldy #ZCRNAME
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cmp (DOSVEC),y
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bne nordos
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ldy #6 ; OS/A+ has a jmp here
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cmp (DOSVEC),y
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beq nordos
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spdos: sec ; SpartaDOS, OS/A+ or DOS XL
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rts
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nordos: clc ; normal DOS (no args) detected
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rts
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; Get default device (set by getargs routine)
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_getdefdev:
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lda #<defdev
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ldx #>defdev
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rts
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.data
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; Default device
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defdev:
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.byte "D1:", 0
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.bss
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argc: .res 2
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argv: .res (1 + MAXARGS) * 2
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; Buffer for command line / argv strings
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ourcl: .res CL_SIZE+1
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