534 lines
13 KiB
ArmAsm
534 lines
13 KiB
ArmAsm
; error
|
|
; line input, line editing
|
|
; tokenize
|
|
; detokenize
|
|
; BASIC program memory management
|
|
|
|
; MICROTAN has some nonstandard extension to LIST here
|
|
|
|
.segment "CODE"
|
|
|
|
MEMERR:
|
|
ldx #ERR_MEMFULL
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; HANDLE AN ERROR
|
|
;
|
|
; (X)=OFFSET IN ERROR MESSAGE TABLE
|
|
; (ERRFLG) > 128 IF "ON ERR" TURNED ON
|
|
; (CURLIN+1) = $FF IF IN DIRECT MODE
|
|
; ----------------------------------------------------------------------------
|
|
ERROR:
|
|
lsr Z14
|
|
.ifdef CONFIG_FILE
|
|
lda CURDVC ; output
|
|
beq LC366 ; is screen
|
|
jsr CLRCH ; otherwise redirect output back to screen
|
|
lda #$00
|
|
sta CURDVC
|
|
LC366:
|
|
.endif
|
|
jsr CRDO
|
|
jsr OUTQUES
|
|
L2329:
|
|
lda ERROR_MESSAGES,x
|
|
pha
|
|
and #$7F
|
|
jsr OUTDO
|
|
inx
|
|
pla
|
|
bpl L2329
|
|
jsr STKINI
|
|
lda #<QT_ERROR
|
|
ldy #>QT_ERROR
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; PRINT STRING AT (Y,A)
|
|
; PRINT CURRENT LINE # UNLESS IN DIRECT MODE
|
|
; FALL INTO WARM RESTART
|
|
; ----------------------------------------------------------------------------
|
|
PRINT_ERROR_LINNUM:
|
|
jsr STROUT
|
|
ldy CURLIN+1
|
|
iny
|
|
beq RESTART
|
|
jsr INPRT
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; WARM RESTART ENTRY
|
|
; ----------------------------------------------------------------------------
|
|
RESTART:
|
|
lsr Z14
|
|
lda #<QT_OK
|
|
ldy #>QT_OK
|
|
jsr GOSTROUT
|
|
L2351:
|
|
jsr INLIN
|
|
stx TXTPTR
|
|
sty TXTPTR+1
|
|
jsr CHRGET
|
|
; bug in pre-1.1: CHRGET sets Z on '\0'
|
|
; and ':' - a line starting with ':' in
|
|
; direct mode gets ignored
|
|
tax
|
|
beq L2351
|
|
ldx #$FF
|
|
stx CURLIN+1
|
|
bcc NUMBERED_LINE
|
|
jsr PARSE_INPUT_LINE
|
|
jmp NEWSTT2
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; HANDLE NUMBERED LINE
|
|
; ----------------------------------------------------------------------------
|
|
NUMBERED_LINE:
|
|
jsr LINGET
|
|
jsr PARSE_INPUT_LINE
|
|
sty EOLPNTR
|
|
jsr FNDLIN
|
|
bcc PUT_NEW_LINE
|
|
ldy #$01
|
|
lda (LOWTR),y
|
|
sta INDEX+1
|
|
lda VARTAB
|
|
sta INDEX
|
|
lda LOWTR+1
|
|
sta DEST+1
|
|
lda LOWTR
|
|
dey
|
|
sbc (LOWTR),y
|
|
clc
|
|
adc VARTAB
|
|
sta VARTAB
|
|
sta DEST
|
|
lda VARTAB+1
|
|
adc #$FF
|
|
sta VARTAB+1
|
|
sbc LOWTR+1
|
|
tax
|
|
sec
|
|
lda LOWTR
|
|
sbc VARTAB
|
|
tay
|
|
bcs L23A5
|
|
inx
|
|
dec DEST+1
|
|
L23A5:
|
|
clc
|
|
adc INDEX
|
|
bcc L23AD
|
|
dec INDEX+1
|
|
clc
|
|
L23AD:
|
|
lda (INDEX),y
|
|
sta (DEST),y
|
|
iny
|
|
bne L23AD
|
|
inc INDEX+1
|
|
inc DEST+1
|
|
dex
|
|
bne L23AD
|
|
; ----------------------------------------------------------------------------
|
|
PUT_NEW_LINE:
|
|
jsr SETPTRS
|
|
jsr LE33D
|
|
lda INPUTBUFFER
|
|
beq L2351
|
|
clc
|
|
lda VARTAB
|
|
sta HIGHTR
|
|
adc EOLPNTR
|
|
sta HIGHDS
|
|
ldy VARTAB+1
|
|
sty HIGHTR+1
|
|
bcc L23D6
|
|
iny
|
|
L23D6:
|
|
sty HIGHDS+1
|
|
jsr BLTU
|
|
lda LINNUM
|
|
ldy LINNUM+1
|
|
sta INPUTBUFFER-2
|
|
sty INPUTBUFFER-1
|
|
lda STREND
|
|
ldy STREND+1
|
|
sta VARTAB
|
|
sty VARTAB+1
|
|
ldy EOLPNTR
|
|
dey
|
|
; ---COPY LINE INTO PROGRAM-------
|
|
L23E6:
|
|
lda INPUTBUFFER-4,y
|
|
sta (LOWTR),y
|
|
dey
|
|
bpl L23E6
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; CLEAR ALL VARIABLES
|
|
; RE-ESTABLISH ALL FORWARD LINKS
|
|
; ----------------------------------------------------------------------------
|
|
FIX_LINKS:
|
|
jsr SETPTRS
|
|
jsr LE33D
|
|
jmp L2351
|
|
LE33D:
|
|
lda TXTTAB
|
|
ldy TXTTAB+1
|
|
sta INDEX
|
|
sty INDEX+1
|
|
clc
|
|
L23FA:
|
|
ldy #$01
|
|
lda (INDEX),y
|
|
beq RET3
|
|
ldy #$04
|
|
L2405:
|
|
iny
|
|
lda (INDEX),y
|
|
bne L2405
|
|
iny
|
|
tya
|
|
adc INDEX
|
|
tax
|
|
ldy #$00
|
|
sta (INDEX),y
|
|
lda INDEX+1
|
|
adc #$00
|
|
iny
|
|
sta (INDEX),y
|
|
stx INDEX
|
|
sta INDEX+1
|
|
bcc L23FA ; always
|
|
|
|
|
|
; !!! kbd_loadsave.s requires an RTS here!
|
|
RET3:
|
|
rts
|
|
|
|
.include "inline.s"
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; TOKENIZE THE INPUT LINE
|
|
; ----------------------------------------------------------------------------
|
|
PARSE_INPUT_LINE:
|
|
ldx TXTPTR
|
|
ldy #$04
|
|
sty DATAFLG
|
|
L246C:
|
|
lda $200,x
|
|
cmp #$20
|
|
beq L24AC
|
|
sta ENDCHR
|
|
cmp #$22
|
|
beq L24D0
|
|
bit DATAFLG
|
|
bvs L24AC
|
|
cmp #$3F
|
|
bne L2484
|
|
lda #TOKEN_PRINT
|
|
bne L24AC
|
|
L2484:
|
|
cmp #$30
|
|
bcc L248C
|
|
cmp #$3C
|
|
bcc L24AC
|
|
; ----------------------------------------------------------------------------
|
|
; SEARCH TOKEN NAME TABLE FOR MATCH STARTING
|
|
; WITH CURRENT CHAR FROM INPUT LINE
|
|
; ----------------------------------------------------------------------------
|
|
L248C:
|
|
sty STRNG2
|
|
ldy #$00
|
|
sty EOLPNTR
|
|
dey
|
|
stx TXTPTR
|
|
dex
|
|
L2496:
|
|
iny
|
|
L2497:
|
|
inx
|
|
L2498:
|
|
lda $200,x
|
|
sec
|
|
sbc TOKEN_NAME_TABLE,y
|
|
beq L2496
|
|
cmp #$80
|
|
bne L24D7
|
|
ora EOLPNTR
|
|
; ----------------------------------------------------------------------------
|
|
; STORE CHARACTER OR TOKEN IN OUTPUT LINE
|
|
; ----------------------------------------------------------------------------
|
|
L24AA:
|
|
ldy STRNG2
|
|
L24AC:
|
|
inx
|
|
iny
|
|
sta INPUTBUFFER-5,y
|
|
lda INPUTBUFFER-5,y
|
|
beq L24EA
|
|
sec
|
|
sbc #$3A
|
|
beq L24BF
|
|
cmp #$49
|
|
bne L24C1
|
|
L24BF:
|
|
sta DATAFLG
|
|
L24C1:
|
|
sec
|
|
sbc #TOKEN_REM-':'
|
|
bne L246C
|
|
sta ENDCHR
|
|
; ----------------------------------------------------------------------------
|
|
; HANDLE LITERAL (BETWEEN QUOTES) OR REMARK,
|
|
; BY COPYING CHARS UP TO ENDCHR.
|
|
; ----------------------------------------------------------------------------
|
|
L24C8:
|
|
lda $200,x
|
|
beq L24AC
|
|
cmp ENDCHR
|
|
beq L24AC
|
|
L24D0:
|
|
iny
|
|
sta INPUTBUFFER-5,y
|
|
inx
|
|
bne L24C8
|
|
; ----------------------------------------------------------------------------
|
|
; ADVANCE POINTER TO NEXT TOKEN NAME
|
|
; ----------------------------------------------------------------------------
|
|
L24D7:
|
|
ldx TXTPTR
|
|
inc EOLPNTR
|
|
L24DB:
|
|
iny
|
|
lda MATHTBL+28+1,y
|
|
bpl L24DB
|
|
lda TOKEN_NAME_TABLE,y
|
|
bne L2498
|
|
lda $200,x
|
|
bpl L24AA
|
|
; ---END OF LINE------------------
|
|
L24EA:
|
|
sta INPUTBUFFER-3,y
|
|
dec TXTPTR+1
|
|
lda #<(INPUTBUFFER-1)
|
|
sta TXTPTR
|
|
rts
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; SEARCH FOR LINE
|
|
;
|
|
; (LINNUM) = LINE # TO FIND
|
|
; IF NOT FOUND: CARRY = 0
|
|
; LOWTR POINTS AT NEXT LINE
|
|
; IF FOUND: CARRY = 1
|
|
; LOWTR POINTS AT LINE
|
|
; ----------------------------------------------------------------------------
|
|
FNDLIN:
|
|
lda TXTTAB
|
|
ldx TXTTAB+1
|
|
FL1:
|
|
ldy #$01
|
|
sta LOWTR
|
|
stx LOWTR+1
|
|
lda (LOWTR),y
|
|
beq L251F
|
|
iny
|
|
iny
|
|
lda LINNUM+1
|
|
cmp (LOWTR),y
|
|
bcc L2520
|
|
beq L250D
|
|
dey
|
|
bne L2516
|
|
L250D:
|
|
lda LINNUM
|
|
dey
|
|
cmp (LOWTR),y
|
|
bcc L2520
|
|
beq L2520
|
|
L2516:
|
|
dey
|
|
lda (LOWTR),y
|
|
tax
|
|
dey
|
|
lda (LOWTR),y
|
|
bcs FL1
|
|
L251F:
|
|
clc
|
|
L2520:
|
|
rts
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; "NEW" STATEMENT
|
|
; ----------------------------------------------------------------------------
|
|
NEW:
|
|
bne L2520
|
|
SCRTCH:
|
|
lda #$00
|
|
tay
|
|
sta (TXTTAB),y
|
|
iny
|
|
sta (TXTTAB),y
|
|
lda TXTTAB
|
|
clc
|
|
adc #$02
|
|
sta VARTAB
|
|
lda TXTTAB+1
|
|
adc #$00
|
|
sta VARTAB+1
|
|
; ----------------------------------------------------------------------------
|
|
SETPTRS:
|
|
jsr STXTPT
|
|
lda #$00
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; "CLEAR" STATEMENT
|
|
; ----------------------------------------------------------------------------
|
|
CLEAR:
|
|
bne L256A
|
|
CLEARC:
|
|
lda MEMSIZ
|
|
ldy MEMSIZ+1
|
|
sta FRETOP
|
|
sty FRETOP+1
|
|
lda VARTAB
|
|
ldy VARTAB+1
|
|
sta ARYTAB
|
|
sty ARYTAB+1
|
|
sta STREND
|
|
sty STREND+1
|
|
jsr RESTORE
|
|
; ----------------------------------------------------------------------------
|
|
STKINI:
|
|
ldx #TEMPST
|
|
stx TEMPPT
|
|
pla
|
|
tay
|
|
pla
|
|
ldx #STACK_TOP
|
|
txs
|
|
pha
|
|
tya
|
|
pha
|
|
lda #$00
|
|
sta OLDTEXT+1
|
|
sta SUBFLG
|
|
L256A:
|
|
rts
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; SET TXTPTR TO BEGINNING OF PROGRAM
|
|
; ----------------------------------------------------------------------------
|
|
STXTPT:
|
|
clc
|
|
lda TXTTAB
|
|
adc #$FF
|
|
sta TXTPTR
|
|
lda TXTTAB+1
|
|
adc #$FF
|
|
sta TXTPTR+1
|
|
rts
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; "LIST" STATEMENT
|
|
; ----------------------------------------------------------------------------
|
|
LIST:
|
|
bcc L2581
|
|
beq L2581
|
|
cmp #TOKEN_MINUS
|
|
bne L256A
|
|
L2581:
|
|
jsr LINGET
|
|
jsr FNDLIN
|
|
jsr CHRGOT
|
|
beq L2598
|
|
cmp #TOKEN_MINUS
|
|
bne L2520
|
|
jsr CHRGET
|
|
jsr LINGET
|
|
bne L2520
|
|
L2598:
|
|
pla
|
|
pla
|
|
lda LINNUM
|
|
ora LINNUM+1
|
|
bne L25A6
|
|
lda #$FF
|
|
sta LINNUM
|
|
sta LINNUM+1
|
|
L25A6:
|
|
L25A6X:
|
|
ldy #$01
|
|
sty DATAFLG
|
|
lda (LOWTRX),y
|
|
beq L25E5
|
|
jsr ISCNTC
|
|
jsr CRDO
|
|
iny
|
|
lda (LOWTRX),y
|
|
tax
|
|
iny
|
|
lda (LOWTRX),y
|
|
cmp LINNUM+1
|
|
bne L25C1
|
|
cpx LINNUM
|
|
beq L25C3
|
|
L25C1:
|
|
bcs L25E5
|
|
; ---LIST ONE LINE----------------
|
|
L25C3:
|
|
sty FORPNT
|
|
jsr LINPRT
|
|
lda #$20
|
|
L25CA:
|
|
ldy FORPNT
|
|
and #$7F
|
|
L25CE:
|
|
jsr OUTDO
|
|
cmp #$22
|
|
bne LA519
|
|
lda DATAFLG
|
|
eor #$FF
|
|
sta DATAFLG
|
|
LA519:
|
|
iny
|
|
beq L25E5
|
|
lda (LOWTRX),y
|
|
bne L25E8
|
|
tay
|
|
lda (LOWTRX),y
|
|
tax
|
|
iny
|
|
lda (LOWTRX),y
|
|
stx LOWTRX
|
|
sta LOWTRX+1
|
|
bne L25A6
|
|
L25E5:
|
|
jmp RESTART
|
|
L25E8:
|
|
bpl L25CE
|
|
cmp #$FF
|
|
beq L25CE
|
|
bit DATAFLG
|
|
bmi L25CE
|
|
sec
|
|
sbc #$7F
|
|
tax
|
|
sty FORPNT
|
|
ldy #$FF
|
|
L25F2:
|
|
dex
|
|
beq L25FD
|
|
L25F5:
|
|
iny
|
|
lda TOKEN_NAME_TABLE,y
|
|
bpl L25F5
|
|
bmi L25F2
|
|
L25FD:
|
|
iny
|
|
lda TOKEN_NAME_TABLE,y
|
|
bmi L25CA
|
|
jsr OUTDO
|
|
bne L25FD ; always
|
|
|