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130 lines
2.9 KiB
ArmAsm
130 lines
2.9 KiB
ArmAsm
; mainargs.s
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;
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; Ullrich von Bassewitz, 2003-03-07
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; Based on code from Stefan A. Haubenthal, <polluks@web.de>
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; 2003-05-18, Greg King
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;
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; Scan a group of arguments that are in BASIC's input-buffer.
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; Build an array that points to the beginning of each argument.
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; Send, to main(), that array and the count of the arguments.
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; Command-lines look like these lines:
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;
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; run
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; run : rem no arguments because no comma!
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; run:rem,arg1," arg 2" , arg 3 ,, arg5, ...
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;
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; "run" and "rem" are entokenned; the args. are not. Leading spaces are
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; ignored; trailing spaces are included -- unless the argument was quoted.
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; TO-DO:
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; - The "file-name" might be a path-name; don't copy the directory-components.
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; - Add a control-character quoting mechanism.
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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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; Maximum number of arguments allowed in the argument table.
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; (An argument contains a comma, at least.)
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;
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MAXARGS = BASIC_BUF_LEN - 2 ; (don't count REM and terminating '\0')
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REM = $8f ; BASIC token-code
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NAME_LEN = 16 ; maximum length of command-name
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; Get possible command-line arguments.
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;
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initmainargs:
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; Assume that the program was loaded, a moment ago, by the traditional LOAD
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; statement. Save the "most-recent filename" as argument #0.
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; Because the buffer, that we're copying into, was zeroed out,
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; we don't need to add a NUL character.
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;
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ldy FNAM_LEN
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cpy #NAME_LEN + 1
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bcc L1
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ldy #NAME_LEN - 1 ; limit the length
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L0: lda (FNAM),y
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sta name,y
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L1: dey
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bpl L0
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lda #<name
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ldx #>name
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sta argv
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stx argv + 1
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inc __argc ; argc always is equal to, at least, 1
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; Find the "rem" token.
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;
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ldx #0
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L2: lda BASIC_BUF,x
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beq done ; no "rem," no args.
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inx
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cmp #REM
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bne L2
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ldy #1 * 2
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; Find the next argument.
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;
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next: lda BASIC_BUF,x
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beq done
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inx
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cmp #',' ; look for argument-list separator
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bne next
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lda #$00
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sta BASIC_BUF-1,x ; make the previous arg. be a legal C string
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inc __argc ; found another arg.
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L4: lda BASIC_BUF,x
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beq point ; zero-length argument
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inx
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cmp #' '
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beq L4 ; skip leading spaces
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cmp #'"' ; is argument quoted?
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beq L5
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dex ; no, don't skip over character
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clc ; (quotation-mark sets flag)
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L5: ror quoted ; save it
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; BASIC's input-buffer starts at the beginning of a RAM page.
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; So, we don't need to add the offset -- just store it.
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;
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point: txa
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sta argv,y ; argv[y]= &arg
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iny
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lda #>BASIC_BUF
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sta argv,y
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iny
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asl quoted ; is argument a string-literal?
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bcc next ; no, don't look for ending quotation-mark
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L7: lda BASIC_BUF,x
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beq done
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inx
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cmp #'"'
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bne L7
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lda #$00
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sta BASIC_BUF-1,x ; make this arg. be a legal C string
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beq next ;(bra)
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; (The last vector in argv[] already is NULL.)
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;
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done: 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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; These arrays are zeroed before initmainargs is called.
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; char name[16+1];
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; char* argv[MAXARGS+1]={name};
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;
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.bss
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quoted: .res 1, %00000000
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name: .res NAME_LEN + 1
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argv: .res (MAXARGS + 1) * 2
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