mirror of
https://github.com/cc65/cc65.git
synced 2024-11-02 18:06:48 +00:00
130 lines
2.9 KiB
ArmAsm
130 lines
2.9 KiB
ArmAsm
; mainargs.s
|
|
;
|
|
; Ullrich von Bassewitz, 2003-03-07
|
|
; Based on code from Stefan A. Haubenthal, <polluks@web.de>
|
|
; 2003-05-18, Greg King
|
|
;
|
|
; Scan a group of arguments that are in BASIC's input-buffer.
|
|
; Build an array that points to the beginning of each argument.
|
|
; Send, to main(), that array and the count of the arguments.
|
|
|
|
; Command-lines look like these lines:
|
|
;
|
|
; run
|
|
; run : rem no arguments because no comma!
|
|
; run:rem,arg1," arg 2" , arg 3 ,, arg5, ...
|
|
;
|
|
; "run" and "rem" are entokenned; the args. are not. Leading spaces are
|
|
; ignored; trailing spaces are included -- unless the argument was quoted.
|
|
|
|
; TO-DO:
|
|
; - The "file-name" might be a path-name; don't copy the directory-components.
|
|
; - Add a control-character quoting mechanism.
|
|
|
|
.constructor initmainargs, 24
|
|
.import __argc, __argv
|
|
|
|
.include "c64.inc"
|
|
|
|
; Maximum number of arguments allowed in the argument table.
|
|
; (An argument contains a comma, at least.)
|
|
;
|
|
MAXARGS = BASIC_BUF_LEN - 2 ; (don't count REM and terminating '\0')
|
|
|
|
REM = $8f ; BASIC token-code
|
|
NAME_LEN = 16 ; maximum length of command-name
|
|
|
|
; Get possible command-line arguments.
|
|
;
|
|
initmainargs:
|
|
|
|
; Assume that the program was loaded, a moment ago, by the traditional LOAD
|
|
; statement. Save the "most-recent filename" as argument #0.
|
|
; Because the buffer, that we're copying into, was zeroed out,
|
|
; we don't need to add a NUL character.
|
|
;
|
|
ldy FNAM_LEN
|
|
cpy #NAME_LEN + 1
|
|
bcc L1
|
|
ldy #NAME_LEN - 1 ; limit the length
|
|
L0: lda (FNAM),y
|
|
sta name,y
|
|
L1: dey
|
|
bpl L0
|
|
lda #<name
|
|
ldx #>name
|
|
sta argv
|
|
stx argv + 1
|
|
inc __argc ; argc always is equal to, at least, 1
|
|
|
|
; Find the "rem" token.
|
|
;
|
|
ldx #0
|
|
L2: lda BASIC_BUF,x
|
|
beq done ; no "rem," no args.
|
|
inx
|
|
cmp #REM
|
|
bne L2
|
|
ldy #1 * 2
|
|
|
|
; Find the next argument.
|
|
;
|
|
next: lda BASIC_BUF,x
|
|
beq done
|
|
inx
|
|
cmp #',' ; look for argument-list separator
|
|
bne next
|
|
lda #$00
|
|
sta BASIC_BUF-1,x ; make the previous arg. be a legal C string
|
|
inc __argc ; found another arg.
|
|
|
|
L4: lda BASIC_BUF,x
|
|
beq point ; zero-length argument
|
|
inx
|
|
cmp #' '
|
|
beq L4 ; skip leading spaces
|
|
|
|
cmp #'"' ; is argument quoted?
|
|
beq L5
|
|
dex ; no, don't skip over character
|
|
clc ; (quotation-mark sets flag)
|
|
L5: ror quoted ; save it
|
|
|
|
; BASIC's input-buffer starts at the beginning of a RAM page.
|
|
; So, we don't need to add the offset -- just store it.
|
|
;
|
|
point: txa
|
|
sta argv,y ; argv[y]= &arg
|
|
iny
|
|
lda #>BASIC_BUF
|
|
sta argv,y
|
|
iny
|
|
|
|
asl quoted ; is argument a string-literal?
|
|
bcc next ; no, don't look for ending quotation-mark
|
|
L7: lda BASIC_BUF,x
|
|
beq done
|
|
inx
|
|
cmp #'"'
|
|
bne L7
|
|
lda #$00
|
|
sta BASIC_BUF-1,x ; make this arg. be a legal C string
|
|
beq next ;(bra)
|
|
|
|
; (The last vector in argv[] already is NULL.)
|
|
;
|
|
done: lda #<argv
|
|
ldx #>argv
|
|
sta __argv
|
|
stx __argv + 1
|
|
rts
|
|
|
|
; These arrays are zeroed before initmainargs is called.
|
|
; char name[16+1];
|
|
; char* argv[MAXARGS+1]={name};
|
|
;
|
|
.bss
|
|
quoted: .res 1, %00000000
|
|
name: .res NAME_LEN + 1
|
|
argv: .res (MAXARGS + 1) * 2
|