mirror of https://github.com/mist64/msbasic.git
175 lines
3.7 KiB
ArmAsm
175 lines
3.7 KiB
ArmAsm
.segment "CODE"
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; ----------------------------------------------------------------------------
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; "FRE" FUNCTION
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;
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; COLLECTS GARBAGE AND RETURNS # BYTES OF MEMORY LEFT
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; ----------------------------------------------------------------------------
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FRE:
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lda VALTYP
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beq L3188
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jsr FREFAC
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L3188:
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jsr GARBAG
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sec
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lda FRETOP
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sbc STREND
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tay
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lda FRETOP+1
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sbc STREND+1
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; FALL INTO GIVAYF TO FLOAT THE VALUE
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; NOTE THAT VALUES OVER 32767 WILL RETURN AS NEGATIVE
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; ----------------------------------------------------------------------------
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; FLOAT THE SIGNED INTEGER IN A,Y
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; ----------------------------------------------------------------------------
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GIVAYF:
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ldx #$00
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stx VALTYP
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sta FAC+1
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sty FAC+2
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ldx #$90
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jmp FLOAT1
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POS:
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ldy POSX
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; ----------------------------------------------------------------------------
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; FLOAT (Y) INTO FAC, GIVING VALUE 0-255
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; ----------------------------------------------------------------------------
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SNGFLT:
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lda #$00
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beq GIVAYF
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; ----------------------------------------------------------------------------
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; CHECK FOR DIRECT OR RUNNING MODE
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; GIVING ERROR IF DIRECT MODE
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; ----------------------------------------------------------------------------
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ERRDIR:
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ldx CURLIN+1
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inx
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bne RTS9
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ldx #ERR_ILLDIR
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.ifdef CONFIG_2
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.byte $2C
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LD288:
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ldx #ERR_UNDEFFN
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.endif
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L31AF:
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jmp ERROR
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DEF:
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jsr FNC
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jsr ERRDIR
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jsr CHKOPN
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lda #$80
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sta SUBFLG
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jsr PTRGET
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jsr CHKNUM
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jsr CHKCLS
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lda #TOKEN_EQUAL
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jsr SYNCHR
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.ifndef CONFIG_SMALL
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pha
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.endif
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lda VARPNT+1
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pha
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lda VARPNT
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pha
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lda TXTPTR+1
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pha
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lda TXTPTR
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pha
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jsr DATA
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jmp L3250
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FNC:
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lda #TOKEN_FN
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jsr SYNCHR
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ora #$80
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sta SUBFLG
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jsr PTRGET3
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sta FNCNAM
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sty FNCNAM+1
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jmp CHKNUM
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L31F3:
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jsr FNC
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lda FNCNAM+1
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pha
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lda FNCNAM
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pha
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jsr PARCHK
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jsr CHKNUM
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pla
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sta FNCNAM
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pla
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sta FNCNAM+1
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ldy #$02
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.ifndef CONFIG_2
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ldx #ERR_UNDEFFN
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.endif
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lda (FNCNAM),y
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.ifndef CONFIG_2
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beq L31AF
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.endif
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sta VARPNT
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tax
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iny
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lda (FNCNAM),y
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.ifdef CONFIG_2
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beq LD288
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.endif
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sta VARPNT+1
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.ifndef CONFIG_SMALL
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iny
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.endif
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L3219:
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lda (VARPNT),y
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pha
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dey
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bpl L3219
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ldy VARPNT+1
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jsr STORE_FAC_AT_YX_ROUNDED
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lda TXTPTR+1
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pha
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lda TXTPTR
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pha
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lda (FNCNAM),y
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sta TXTPTR
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iny
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lda (FNCNAM),y
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sta TXTPTR+1
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lda VARPNT+1
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pha
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lda VARPNT
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pha
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jsr FRMNUM
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pla
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sta FNCNAM
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pla
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sta FNCNAM+1
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jsr CHRGOT
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beq L324A
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jmp SYNERR
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L324A:
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pla
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sta TXTPTR
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pla
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sta TXTPTR+1
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L3250:
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ldy #$00
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pla
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sta (FNCNAM),y
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pla
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iny
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sta (FNCNAM),y
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pla
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iny
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sta (FNCNAM),y
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pla
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iny
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sta (FNCNAM),y
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.ifndef CONFIG_SMALL
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pla
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iny
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sta (FNCNAM),y
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.endif
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rts
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