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144 lines
3.2 KiB
ArmAsm
144 lines
3.2 KiB
ArmAsm
; get arguments from command line (when DOS supports it)
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; Freddy Offenga, 4/21/2000
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; initmainargs is forcibly included by the C compiler if it encounters a
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; main() function with arguments. Therefore it isn't referenced by the
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; startup code but is nevertheless included in the compiled program when
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; needed.
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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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.import __argc, __argv
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.importzp ptr1
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.import __dos_type
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.constructor initmainargs,25
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; --------------------------------------------------------------------------
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; Get command line
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.segment "INIT"
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initmainargs:
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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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lda __dos_type ; which DOS?
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cmp #ATARIDOS
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beq nargdos ; DOS does not support arguments
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cmp #MYDOS
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bne argdos ; DOS supports arguments
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nargdos: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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; Turn command line into argv table
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;ldy #0
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tay
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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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lda #<argv
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ldx #>argv
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sta __argv
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stx __argv+1
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rts
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; --------------------------------------------------------------------------
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; Data
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.bss
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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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