mirror of https://github.com/mist64/msbasic.git
243 lines
5.3 KiB
ArmAsm
243 lines
5.3 KiB
ArmAsm
.segment "CODE"
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; ----------------------------------------------------------------------------
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; "DIM" STATEMENT
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; ----------------------------------------------------------------------------
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NXDIM:
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jsr CHKCOM
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DIM:
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tax
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jsr PTRGET2
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jsr CHRGOT
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bne NXDIM
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rts
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; ----------------------------------------------------------------------------
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; PTRGET -- GENERAL VARIABLE SCAN
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;
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; SCANS VARIABLE NAME AT TXTPTR, AND SEARCHES THE
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; VARTAB AND ARYTAB FOR THE NAME.
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; IF NOT FOUND, CREATE VARIABLE OF APPROPRIATE TYPE.
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; RETURN WITH ADDRESS IN VARPNT AND Y,A
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;
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; ACTUAL ACTIVITY CONTROLLED SOMEWHAT BY TWO FLAGS:
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; DIMFLG -- NONZERO IF CALLED FROM "DIM"
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; ELSE = 0
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;
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; SUBFLG -- = $00
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; = $40 IF CALLED FROM "GETARYPT"
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; ----------------------------------------------------------------------------
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PTRGET:
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ldx #$00
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jsr CHRGOT
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PTRGET2:
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stx DIMFLG
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PTRGET3:
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sta VARNAM
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jsr CHRGOT
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jsr ISLETC
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bcs NAMOK
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SYNERR3:
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jmp SYNERR
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NAMOK:
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ldx #$00
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stx VALTYP
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.ifndef CONFIG_SMALL
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stx VALTYP+1
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.endif
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jsr CHRGET
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bcc L2ECD
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jsr ISLETC
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bcc L2ED8
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L2ECD:
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tax
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L2ECE:
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jsr CHRGET
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bcc L2ECE
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jsr ISLETC
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bcs L2ECE
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L2ED8:
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cmp #$24
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.ifdef CONFIG_SMALL
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bne L2EF9
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.else
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bne L2EE2
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.endif
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lda #$FF
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sta VALTYP
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.ifndef CONFIG_SMALL
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bne L2EF2
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L2EE2:
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cmp #$25
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bne L2EF9
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lda SUBFLG
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bne SYNERR3
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lda #$80
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sta VALTYP+1
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ora VARNAM
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sta VARNAM
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L2EF2:
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.endif
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txa
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ora #$80
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tax
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jsr CHRGET
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L2EF9:
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stx VARNAM+1
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sec
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ora SUBFLG
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sbc #$28
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bne L2F05
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jmp ARRAY
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L2F05:
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lda #$00
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sta SUBFLG
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lda VARTAB
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ldx VARTAB+1
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ldy #$00
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L2F0F:
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stx LOWTR+1
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L2F11:
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sta LOWTR
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cpx ARYTAB+1
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bne L2F1B
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cmp ARYTAB
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beq NAMENOTFOUND
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L2F1B:
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lda VARNAM
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cmp (LOWTR),y
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bne L2F29
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lda VARNAM+1
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iny
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cmp (LOWTR),y
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beq SET_VARPNT_AND_YA
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dey
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L2F29:
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clc
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lda LOWTR
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adc #BYTES_PER_VARIABLE
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bcc L2F11
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inx
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bne L2F0F
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; ----------------------------------------------------------------------------
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; CHECK IF (A) IS ASCII LETTER A-Z
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;
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; RETURN CARRY = 1 IF A-Z
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; = 0 IF NOT
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; ----------------------------------------------------------------------------
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ISLETC:
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cmp #$41
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bcc L2F3C
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sbc #$5B
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sec
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sbc #$A5
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L2F3C:
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rts
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; ----------------------------------------------------------------------------
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; VARIABLE NOT FOUND, SO MAKE ONE
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; ----------------------------------------------------------------------------
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NAMENOTFOUND:
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pla
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pha
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cmp #<FRM_VARIABLE_CALL
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bne MAKENEWVARIABLE
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.ifdef CONFIG_SAFE_NAMENOTFOUND
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tsx
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lda STACK+2,x
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cmp #>FRM_VARIABLE_CALL
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bne MAKENEWVARIABLE
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.endif
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LD015:
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lda #<C_ZERO
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ldy #>C_ZERO
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rts
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; ----------------------------------------------------------------------------
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.ifndef CONFIG_2
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C_ZERO:
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.byte $00,$00
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.endif
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; ----------------------------------------------------------------------------
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; MAKE A NEW SIMPLE VARIABLE
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;
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; MOVE ARRAYS UP 7 BYTES TO MAKE ROOM FOR NEW VARIABLE
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; ENTER 7-BYTE VARIABLE DATA IN THE HOLE
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; ----------------------------------------------------------------------------
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MAKENEWVARIABLE:
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.ifdef CONFIG_CBM_ALL
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lda VARNAM
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ldy VARNAM+1
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cmp #$54
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bne LD02F
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cpy #$C9
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beq LD015
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cpy #$49
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bne LD02F
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LD02C:
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jmp SYNERR
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LD02F:
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cmp #$53
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bne LD037
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cpy #$54
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beq LD02C
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LD037:
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.endif
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lda ARYTAB
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ldy ARYTAB+1
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sta LOWTR
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sty LOWTR+1
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lda STREND
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ldy STREND+1
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sta HIGHTR
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sty HIGHTR+1
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clc
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adc #BYTES_PER_VARIABLE
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bcc L2F68
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iny
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L2F68:
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sta HIGHDS
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sty HIGHDS+1
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jsr BLTU
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lda HIGHDS
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ldy HIGHDS+1
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iny
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sta ARYTAB
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sty ARYTAB+1
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ldy #$00
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lda VARNAM
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sta (LOWTR),y
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iny
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lda VARNAM+1
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sta (LOWTR),y
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lda #$00
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iny
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sta (LOWTR),y
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iny
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sta (LOWTR),y
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iny
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sta (LOWTR),y
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iny
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sta (LOWTR),y
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.ifndef CONFIG_SMALL
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iny
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sta (LOWTR),y
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.endif
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; ----------------------------------------------------------------------------
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; PUT ADDRESS OF VALUE OF VARIABLE IN VARPNT AND Y,A
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; ----------------------------------------------------------------------------
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SET_VARPNT_AND_YA:
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lda LOWTR
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clc
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adc #$02
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ldy LOWTR+1
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bcc L2F9E
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iny
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L2F9E:
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sta VARPNT
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sty VARPNT+1
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rts
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