;
; 2003-03-07, Ullrich von Bassewitz
; 2011-01-28, Stefan Haubenthal
-; 2013-12-22, Greg King
+; 2014-09-10, Greg King
;
-; Setup arguments for main
+; Set up arguments for main
;
.constructor initmainargs, 24
.macpack generic
MAXARGS = 10 ; Maximum number of arguments allowed
-REM = $9d ; BASIC token-code
+REM = $9D ; BASIC token-code
;---------------------------------------------------------------------------
-; Get possible command-line arguments. Goes into the special INIT segment,
-; which may be reused after the startup code is run
+; Get possible command-line arguments. Goes into the special ONCE segment,
+; which will be reused after the startup code is run.
-.segment "INIT"
+.segment "ONCE"
.proc 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 #FNAME_LEN - 1 ; limit the length
+
+ ldy #FNAME_LEN ; Limit the length
+ lda #0 ; The terminating NUL character
+ beq L1 ; Branch always
L0: lda CFOUND_NAME,y
- sta name,y
+L1: sta name,y
dey
bpl L0
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.
+ beq done ; No "rem", no args.
inx
cmp #REM
bne L2
beq done ; End of line reached
inx
cmp #' ' ; Skip leading spaces
- beq next ;
+ beq next
; Found start of next argument. We've incremented the pointer in X already, so
; it points to the second character of the argument. This is useful since we
txa ; Get low byte
add #<args
- sta argv,y ; argv[y]= &arg
- lda #>0
+ sta argv,y ; argv[y]=&arg
+ lda #>$0000
adc #>args
sta argv+1,y
iny
.endproc
-; These arrays are zeroed before initmainargs is called.
-; char name[16+1];
-; char* argv[MAXARGS+1]={name};
-;
-.bss
+.segment "INIT"
+
term: .res 1
name: .res FNAME_LEN + 1
args: .res SCREEN_XSIZE * 2 - 1
.data
+
+; This array has zeroes when initmainargs starts.
+; char* argv[MAXARGS+1]={name};
+
argv: .addr name
- .res MAXARGS * 2, 0
+ .res MAXARGS * 2