; Setup arguments for main
;
- .constructor initmainargs, 24
- .import __argc, __argv
+ .constructor initmainargs, 24
+ .import __argc, __argv
- .include "pet.inc"
+ .include "pet.inc"
-MAXARGS = 10 ; Maximum number of arguments allowed
-REM = $8f ; BASIC token-code
-NAME_LEN = 16 ; maximum length of command-name
-BASIC_BUF= $200
+MAXARGS = 10 ; Maximum number of arguments allowed
+REM = $8f ; BASIC token-code
+NAME_LEN = 16 ; maximum length of command-name
;---------------------------------------------------------------------------
; Get possible command-line arguments. Goes into the special INIT segment,
; which may be reused after the startup code is run
-.segment "INIT"
+.segment "INIT"
-.proc initmainargs
+.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 FNLEN
- cpy #NAME_LEN + 1
- bcc L1
- ldy #NAME_LEN - 1 ; limit the length
-L0: lda (FNADR),y
- sta name,y
-L1: dey
- bpl L0
- inc __argc ; argc always is equal to, at least, 1
+ ldy FNLEN
+ cpy #NAME_LEN + 1
+ bcc L1
+ ldy #NAME_LEN - 1 ; limit the length
+L0: lda (FNADR),y
+ sta name,y
+L1: 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.
- inx
- cmp #REM
- bne L2
- ldy #1 * 2
+ 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 ; End of line reached
- inx
- cmp #' ' ; Skip leading spaces
- beq next ;
+next: lda BASIC_BUF,x
+ beq done ; End of line reached
+ inx
+ cmp #' ' ; Skip leading spaces
+ 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
; will check now for a quoted argument, in which case we will have to skip this
; first character.
-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
+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. Since the BASIC
; input buffer is located at the start of a RAM page, no calculations are
; necessary.
- txa ; Get low byte
- sta argv,y ; argv[y]= &arg
- iny
- lda #>BASIC_BUF
- sta argv,y
- iny
- inc __argc ; Found another arg
+ txa ; Get low byte
+ sta argv,y ; argv[y]= &arg
+ iny
+ lda #>BASIC_BUF
+ sta argv,y
+ iny
+ inc __argc ; Found another arg
; Search for the end of the argument
-argloop:lda BASIC_BUF,x
- beq done
- inx
- cmp term
- bne argloop
+argloop:lda BASIC_BUF,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 BASIC_BUF-1,x
+ lda #0
+ sta BASIC_BUF-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
+ lda __argc ; Get low byte of argument count
+ cmp #MAXARGS ; Maximum number of arguments reached?
+ bcc next ; Parse next one if not
; (The last vector in argv[] already is NULL.)
-done: lda #<argv
- ldx #>argv
- sta __argv
- stx __argv + 1
- rts
+ ldx #>argv
+ sta __argv
+ stx __argv + 1
+ rts
.endproc
; These arrays are zeroed before initmainargs is called.
-; char name[16+1];
+; char name[16+1];
; char* argv[MAXARGS+1]={name};
;
.bss
-term: .res 1
-name: .res NAME_LEN + 1
+term: .res 1
+name: .res NAME_LEN + 1
.data
-argv: .addr name
- .res MAXARGS * 2
+argv: .addr name
+ .res MAXARGS * 2
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