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73 lines
1.5 KiB
ArmAsm
73 lines
1.5 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 2003-03-07
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;
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; Setup arguments for main.
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; Based on code from Stefan A. Haubenthal, <polluks@web.de>
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;
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.constructor initmainargs, 24
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.import __argc, __argv
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.include "c64.inc"
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;---------------------------------------------------------------------------
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; Setup arguments for main
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.proc initmainargs
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; Setup a pointer to our argv vector
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lda #<argv
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sta __argv
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lda #>argv
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sta __argv+1
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; Save the last filename as argument #0. Since the buffer we're copying into
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; is zeroed out, we don't need to add a NUL character.
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ldy FNAM_LEN
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cpy #16+1
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bcc L0
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ldy #16 ; Limit the length
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L0: dey
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L1: lda (FNAM),y
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sta argv0,y
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dey
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bpl L1
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inc __argc ; __argc = 1
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; Find argument in BASIC buffer, if found, use it as arg #1
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ldy #0
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L2: lda $200,y
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beq L9
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iny
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cmp #$8F ; REM token
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bne L2
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sty argv+2 ; Store offset
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ldy #>$200
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sty argv+3
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inc __argc ; argc = 2
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; Done
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L9: rts
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.endproc
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;---------------------------------------------------------------------------
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; Data
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.data
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argv: .word argv0 ; Pointer to program name
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.word $0000 ; Optional second argument
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.word $0000 ; Last vector must always be NULL
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.bss
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argv0: .res 17 ; Program name
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