cc65/libsrc/telestrat/mainargs.s

;
; 2003-03-07, Ullrich von Bassewitz
; 2011-01-28, Stefan Haubenthal
; 2014-09-10, Greg King
;
; Set up arguments for main
;

        .constructor    initmainargs, 24
        .import         __argc, __argv
        .import         ptr1
        .include        "telestrat.inc"
        .macpack        generic

MAXARGS  = 10                   ; Maximum number of arguments allowed





; Assume that the program was loaded, a moment ago, by the traditional LOAD
; statement.  Save the "most-recent filename" as argument #0.
initmainargs:

        ldx     #0      ; Limit the length
L0:     lda     BUFEDT,x
        beq     L3
        cmp     #' '
        bne     L1
        lda     #0
        beq     L3
L1:     sta     name,x
        inx
        cpx     #FNAME_LEN
        bne     L0
        lda     #0
L3:
        sta     name,x
        inc     __argc          ; argc always is equal to, at least, 1


        ldy     #1 * 2          ; Point to second argv slot

next:   lda     BUFEDT,x
        beq     done            ; End of line reached
        inx
        cmp     #' '            ; Skip leading spaces
        beq     next

found:  cmp     #'"'            ; Is the argument quoted?
        beq     setterm         ; Jump if so
        dex                     ; Reset pointer to first argument character

        lda     #' '            ; A space ends the argument
setterm:sta     term            ; Set end of argument marker

; Now, store a pointer, to the argument, into the next slot.

        txa                     ; Get low byte
        clc
        adc     #<BUFEDT
        bcc     L4
        inc     L5+1
L4:
        sta     argv,y          ; argv[y]=&arg
L5:
        lda     #>BUFEDT
        sta     argv+1,y
        iny
        iny
        inc     __argc          ; Found another arg

; Search for the end of the argument



argloop:lda     BUFEDT,x
        beq     done
        inx
        cmp     term
        bne     argloop

; We've found the end of the argument. X points one character behind it, and
; A contains the terminating character. To make the argument a valid C string,
; replace the terminating character by a zero.

        lda     #0
        sta     BUFEDT-1,x

; Check if the maximum number of command line arguments is reached. If not,
; parse the next one.

        lda     __argc          ; Get low byte of argument count
        cmp     #MAXARGS        ; Maximum number of arguments reached?
        bcc     next            ; Parse next one if not


done:   lda     #<argv
        ldx     #>argv
        sta     __argv
        stx     __argv + 1
        rts


.segment        "INIT"

term:   .res    1


.data

name:   .res    FNAME_LEN + 1
args:   .res    SCREEN_XSIZE * 2 - 1

param_found:
                .res 1
; char* argv[MAXARGS+1]={name};
argv:
                .addr   name
        .res    MAXARGS * 2