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list.src
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list.src
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.page
.subttl 'list'
list
jsr range ;set up line range
; pla ;pop return addr off stack.. this sucker wants
; pla ; to crash into 'ready' when it's done.
list05
ldy #1
jsr indlow ;get ms byte of line to lists pointer
bne list10 ;ok if not zero, but..
dey
jsr indlow
beq gordy2 ;..if ls byte is also zero, we're done.
list10
jsr iscntc ;stop key?
jsr crdo ;new line
ldy #2
jsr indlow ;get ms byte of line number
tax
iny
jsr indlow ;get ls byte.
cmp linnum+1 ;test if we are past the last line requested.
bne list20
cpx linnum
beq list30
list20
bcs gordy2 ;next line is > last line requested, exit.
list30
jsr p1line ;print line #, space, and the line of code.
ldy #0 ;move 'pointer to next line' into (lowtr)
jsr indlow
tax
iny
jsr indlow
stx lowtr
sta lowtr+1
jmp list05
gordy2
jmp crdo ;jmp ready
.page
;******************************************************
; print 1 line of basic.
; entry:
; x,a contains line number low,high
; (lowtr) points to begining of line in text
;
; next-line line-num basic.......text null
; lo hi lo hi byte byte...byte 00
; /|
; (lowtr) acc x
;
;******************************************************
p1line
ldy #3
sty lstpnt
sty dores ;reset quote-switch
jsr linprt ;print line number
lda #' ' ;print a space
p1l010
ldy lstpnt
and #$7f
p1l015
jsr outdo
cmp #'"' ;if quote character, toggle quote-switch
bne p1l019
lda dores
eor #$ff
sta dores
p1l019
iny ;point to next character
beq gordy2 ;failsafe mechanism...basic text was mangled, crash.
bit helper ;called by 'help' or 'list' cmd?
bpl p1l020 ;list!
jsr helpsb ;help!
p1l020
jsr indlow
beq p1lrts ;finished when trailing null is found
jmp (iqplop) ;usually points to nqplop
nqplop
bpl p1l015 ;not a token, just print character
cmp #pi
beq p1l015 ;pi is >$80, but should be printed 'as is' anyway.
bit dores ;is quote switch on?
bmi p1l015 ;yes, print char 'as is'
; at this point, we know we're talking token. scan the token text
; list until the correct text is found, and print that text.
cmp #esctk ;is this an escape token?
bne p1l025 ;nope
iny ;yes, point to next character
jsr indlow ;and get the second token
beq p1l021 ;eol. go backup 1, and print esctk as graphic
sty lstpnt ;set up y to continue when we're done
sec ;set flag for test,
jmp (iescpr) ;..and see if anyone out there wants it.
nescpr
bcs p1l015 ;nobody wanted it, print it as a graphic
ldy #0
beq p1l070 ;sombody wanted it. print his string.
p1l021 ;an esc token found with no chrs following it.
dey
lda #esctk ;print esctk as a graphic to show that somethings amiss.
bne p1l015 ;always
p1l025
tax ;use the token as index
sty lstpnt
ldy #>reslst ;set index1 pointing to token text list
sty index1+1
ldy #<reslst
sty index1
ldy #0
p1l030
dex ;is this the correct text?
bpl p1l070 ;yes
p1l040
lda (index1),y ;ind.ok
pha
inc index1 ;else scan till next command text
bne p1l050
inc index1+1
p1l050
pla
bpl p1l040 ;look for char with msb set (end terminator)
bmi p1l030 ;check next command
p1l060
iny
p1l070
lda (index1),y ;indirect ok.
bmi p1l010 ;print last chr after masking msb, continue on line.
jsr outdo ;print non-terminator character
bne p1l060 ;always
p1lrts
rts
;.end