davex-mg-utils/nbp.parse.s

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2017-09-15 16:55:29 +00:00
; %help
; nbp.parse <name> - parse and output parts of NBP <name>
;
; options: -s Substitute defaults for unspecified portions.
; %hend
.pc02
.include "davex-mg.inc"
ch = $24 ; cursor horizontal pos
sptr = xczpage
sptr2 = sptr+2
stemp = sptr2+2
mode = stemp+1
namebuf = filebuff2
DX_start dx_mg_auto_origin
DX_info $01,$12,dx_cc_iie_or_iigs,$00
DX_ptab
DX_parm $00,t_string ; NBP name to parse
DX_parm 's',t_nil ; if given, sub defaults
DX_end_ptab
DX_desc "Parse AppleTalk NBP names."
DX_main
lda #$00
sta mode
lda #'s'+$80
jsr xgetparm_ch
bcs :+
lda #$80
sta mode
: jsr setsptr
lda #$00
jsr xgetparm_n
ldx mode
jsr get_nbp
php
phx
ply
lda #$00
jsr xprdec_2
jsr xmess
.byte ' '+$80,$00
plp
bcc printv
lda #<nonestr
sta sptr
lda #>nonestr
sta sptr+1
printv: jsr prpas
jsr xmess
.byte $8d,$00
next: inc mode
lda mode
and #$7f
cmp #$03
bcc :-
rts
setsptr: lda #<namebuf
sta sptr
lda #>namebuf
sta sptr+1
rts
nonestr: .byte 6,"(none)"
; ***
; get_nbp - get part of a name at ay and copy to sptr
; x = 0:name 1:type 2:zone, +$80 sub wildcard or default if none given
; return: (sptr) = string, x = length of it
.proc get_nbp
sty sptr2
sta sptr2+1
stx stemp
ldy #$00
sty colon ; init these
sty at
lda sptr ; copy sptr to self-modifying wrtdest
sta wrtdest+1
lda sptr+1
sta wrtdest+2
jsr incdest ; and move to first char position
lda (sptr2),y ; length
beq notfound ; zero, just give up
sta end
; find the delimiters
tay
: lda (sptr2),y
cmp #':'
bne notcolon
sty colon
notcolon: cmp #'@'
bne nxtdelim
sty at
nxtdelim: dey
bne :-
; now make sure that if @ is given, it is after :
lda at
beq :+
cmp colon
bcc bad
; now get the part requested
: lda stemp
and #$7f
beq getname
cmp #$01
beq gettype
getzone: ldy at
beq notfound
cpy end
beq notfound
; need to copy from at(+1) to end
docopy: ldx #$00
: iny
lda (sptr2),y
jsr wrtdest
cpy end ; was that the last char
bcc :- ; nope, next char
ldy #$00
txa
sta (sptr),y ; save copied length
clc
rts ; and return
getname: ldy colon
bne :+
ldy at
beq :++
: dey
sty end
: ldy end
beq notfound
ldy #$00 ; initially at pos 0
; need to copy from pos 1 to end
beq docopy ; always
gettype: ldy colon
beq notfound ; early out if no colon
cpy end
beq notfound
ldy at
beq :+ ; use end as-is
dey ; otherwise end at pos before @
sty end
: ldy colon
; need to copy from colon(+1) to end
bne docopy ; should be always
notfound: lda stemp
and #$80
bne :+ ; if client asked for a default
lda #$00
tay
tax ; x is officially length of string result
sta (sptr),y ; put a zero in destination
bad: sec ; tell client we gave an empty string
rts
: ldx #$01 ; length of default
ldy #$00
txa
sta (sptr),y
iny
lda stemp
cmp #$82 ; want default zone? ('*')
bne :++ ; nope
lda #'*'
: sta (sptr),y
clc
rts
: lda #'=' ; wildcard for name or type
bne :-- ; always
wrtdest: sta $ffff
inx ; inc count of copied chars
incdest: inc wrtdest+1
bne :+
inc wrtdest+2
: rts
colon: .byte $00
at: .byte $00
end: .byte $00
.endproc
; increment sptr by a
.proc addsptr
clc
adc sptr
sta sptr
bcc :+
inc sptr+1
: rts
.endproc
; print pascal string at sptr
; leave sptr pointed at one past end
; of string
.proc prpas
ldy #$00
lda (sptr),y ; get length
tax
next: lda #$01
jsr addsptr
dex
bpl :+
rts
: lda (sptr),y ; get char
ora #$80 ; make printable
jsr cout
bra next
.endproc
; copy a pascal string to sptr offset by y
; a,x = source
; return: y = new offset after copied str
.proc copystr
sta sptr2+1
stx sptr2
sty stemp ; save offset
ldy #$00
lda (sptr2),y ; get number of chars
tax ; to copy
ldy stemp ; get the offset
sta (sptr),y ; store the length byte
inc stemp ; increment the offset
inc sptr2 ; next source char
bne :+
inc sptr2+1
: ldy #0
; copy loop
: phy
lda (sptr2),y
ldy stemp
sta (sptr),y
inc stemp
ply
iny
dex
bne :-
ldy stemp
rts
.endproc
DX_end