; odds.z - code that has no place else to live

.incl	"c:termcap"
.incl	"c:vars"

.var	slow	86		; should we slow down outgoing string

.extern	prompt			; print an inline prompt then get a buffer
prompt:				; full of data from the keyboard
	ld	a,(prmpfl)	; see if we're in a chat script or not
	or	a
	jr	z,nochat	; no - do normal input
	push	ix
	pop	hl		; get string address to hl
	ld	de,ipbuf
	ld	bc,116		; reasonable amount to copy
	ldir			; move it over, and we're done
skipze:	pop	hl		; get string address - we have to skip over it
skiplp:	inc	hl		; this relies on a non-empty string
	ld	a,(hl)
	or	a
	jr	nz,skiplp	; skip till we reach the end
	jp	(hl)		; and return to address in hl
nochat:	call	dim		; set dim mode
	ld	hl,crlfms
	call	prtslp		; send a newline
	pop	hl
	call	prtslp		; print the prompt
	push	hl
	ld	de,ipbuf - 2	; point at where we'll read info
	ld	a,e
	ld	(de),a		; set count
	ld	c,buffin
	call	bdos		; read a line
	ld	hl,ipbuf - 1
	ld	e,(hl)		; get count actually input
	ld	d,h
	add	hl,de
	inc	hl		; turn into a buffer pointer
	ld	(hl),d		; and zero terminate input data

.extern	crlf			; just print a newline
crlf:
	call	ilprt
crlfms:	db	'\r\n'
zero:	db	0
	ret

.extern	ilprt
ilprt:	call	dim		; in line print - start by going dim
	pop	hl		; get string address
	call	prtslp		; out it goes
	push	hl		; restore return address - fall into bright

.extern	bright
bright:	ld	a,(tcbits)
	and	b_brite		; do we have a bright string?
	ret	z
	ld	hl,bflag	; currently bright?
	ld	a,(hl)
	dec	a
	ret	nz		; yes, don't resend
	ld	(hl),a
	ld	hl,brites	; get address of bright string
	jr	prtslx		; and send it

.extern	dim
dim:	ld	a,(tcbits)
	and	b_dim		; do we have a dim string?
	ret	z
	ld	hl,bflag	; currently dim?
	ld	a,(hl)
	or	a
	ret	nz		; yes, don't resend
	inc	(hl)
	ld	hl,dims		; get address of dim string
	jr	prtslx

.extern	dellin
dellin:
	ld	hl,dlstr	; get address of dellin string
	jr	prtslx		; and send it

.extern	inslin
inslin:
	ld	hl,ilstr	; get address of inslin string
	jr	prtslx		; and send it

.extern	cleol
cleol:
	ld	hl,ceol		; get address of cleol string
	jr	prtslx		; and send it

.extern	cleos
cleos:
	ld	hl,ceos		; get address of cleos string
	jr	prtslx		; and send it

.extern	clear
clear:	ld	hl,clrs		; get address of clear string

prtslx:	ld	a,h
	ld	(optype),a
	call	prtslp
	xor	a
	ld	(optype),a
	ret

.extern	prtslp
prtslp:
	call	clrpcp

.extern	prtsl1
prtsl1:
	ld	a,(hl)
	or	a
	ret	z
	inc	hl
	push	hl
	call	tabexp
	pop	hl
; for ^X to can a long directory, add a 'ret c' here
	jr	prtsl1

.extern	tabexp
tabexp:
	cp	'\n'
	jr	nz,nonl
	ld	a,79
	ld	(pos),a
	ld	a,'\n'
nonl:	cp	'\r'
	jr	nz,nocr
	ld	a,0xff
	ld	(pos),a
	ld	a,'\r'
nocr:	cp	'\t'
	jr	z,tablp
	call	prtopc
	jr	chk80
tablp:	ld	a,' '
	call	prtopc
	ld	a,(pos)
	and	7
	jr	nz,tablp
chk80:	ld	hl,pos
	ld	a,(hl)
	xor	80
	call	z,newlin
	ret

prtopc:	ld	c,a
	ld	a,(optype)
	or	a
	ld	a,c
	jp	nz,scrout
	ld	hl,mode
	ld	e,(hl)
	push	hl
	push	de
	ld	(hl),lf_bit
	call	opchar
	pop	de
	pop	hl
	ld	(hl),e
	ld	hl,pos
	inc	(hl)
	ret

newlin:	ld	(hl),a		; set char count back to zero
	inc	hl		; point at line count
	inc	(hl)		; bump that too
	ld	a,(hl)
	xor	23		; 23 lines?
	ret	nz		; return if not
	ld	a,(pagerf)
	or	a
	ret	z		; and return if not paging
	dec	(hl)		; set back to 22 in case we get a return
	ld	hl,mmsg
.dseg
mmsg:	db	'[more]\0'
.cseg
	call	prtsl1		; print more message
	call	kbdin		; get a character
	ld	hl,cmstr
.dseg
cmstr:	db	'\r      \r\0'
.cseg
	cp	(hl)		; return?
	jr	z,clrmor	; yes - just remove '[more]', linec is set
	xor	'x' & 0x1f
	jr	z,retcx		; special exit on a ^X
	xor	a
	ld	(linec),a	; else clear linc for a full page
clrmor:	jp	prtsl1		; and remove the more message

retcx:	call	prtsl1		; come here after a ^X - we remove the message
	scf			; and return carry to flag the exit
	ret

.extern	clrpsp
clrpsp:
	db	0x3e		; makes a ld a,xx

.extern	clrpcp
clrpcp:
	xor	a
	ld	(pagerf),a
	push	hl
	ld	hl,0
	ld	(pos),hl
	pop	hl
	ret

.extern	mtprt			; a call to this is followed by inline coords.
mtprt:				; and a string to be printed at the coords
	pop	hl
	ld	e,(hl)
	inc	hl
	ld	d,(hl)		; get moveto coordinates
	inc	hl
	push	hl		; save address of string
	ex	de,hl		; coords to hl
	call	moveto		; move to wherever
	pop	hl		; restore string to hl
	call	prtslp		; print it
	jp	(hl)		; and return

.extern	decob			; print number in l, by zeroing h
decob:
	ld	h,0		; clear h and fall through

.extern	decout			; print number in hl in decimal
decout:
	push	de		; save running total
	push	bc		; save char count
	ld	bc,-10
	ld	de,-1
decou2:	add	hl,bc
	inc	de
	jr	c,decou2	; divide hl by 10
	sbc	hl,bc		; reset because of overflow
	ex	de,hl		; remainder to e, answer to hl
	ld	a,h
	or	l
	pop	bc		; restore char count for next call
	call	nz,decout	; answer non-zero: print recursively
	ld	a,e		; get remainder
	add	a,'0'
	ld	c,a
	push	bc
	call	scrout		; print to screen as a digit
	pop	bc
	dec	b		; keep count of printed chars in b
	pop	de		; restore total
	ret

.extern	break
break:
	call	tenth		; wait a while before beginning
	call	sbreak		; start the break
	call	tenth3		; idle for 3/10 of a second
	jp	ebreak		; finish off by ending the break

.extern	hangup
hangup:
	ld	hl,#dtroff
	ld	a,(hl)
	cp	0xc9		; return at dtroff => no code
	jr	z,strhup	; so send a string instead
	call	dtroff		; drop dtr - should make modem hang up
	call	tenth3
	call	tenth3		; wait a (long) while
	jp	dtron		; dtr back on
strhup:	ld	ix,hangup - slow
	inc	hl
	ld	b,(hl)		; get the string length
	inc	hl
	jp	sendcs		; and out it goes

tenth3:	call	tenth
	call	tenth

.extern	tenth			; delay for 1/10 of a second, but continue to
tenth:				; save incoming chars
	ld	de,100
	call	setspd		; get speed constant to hl
tnthlp:	ld	b,60
tnthl1:	djnz	tnthl1		; idle a while
	push	hl
	call	savrng		; check incoming chars, but only as far as
	pop	hl		; the ring buffer
	dec	hl		; count main timer
	ld	a,h
	or	l
	jr	nz,tnthlp
	ret

.extern	tnthip			; delay for 1/10 of a second, but continue to
tnthip:				; check the modem for incoming chars
	ld	de,100

.extern	msip			; delay for de msec, but continue to
msip:				; check the modem for incoming chars
	ld	a,d
	or	e		; anything in de?
	ret	z		; nope - return right now
	call	setspd		; get speed constant to hl
msil:	ld	b,60
msl2:	djnz	msl2		; idle a while
	push	hl
	call	lstmod		; process incoming chars and printer output
	pop	hl
	dec	hl		; count main timer
	ld	a,h
	or	l
	jr	nz,msil
	ret

.extern	setspd			; take 1MHz value in de, get correct value in
setspd:				; hl based on cpu speed
	ld	hl,0
	ld	a,(speed)
	ld	b,a		; get cpu speed to b
spdok:	add	hl,de		; multiply de by b
	djnz	spdok
	ret

.extern	help
help:
	call	crlf		; start off with a new line
	call	dim		; and dim
	call	presc		; print the escape character
	or	a		; test the flag
	ld	c,' '
	call	z,scrout	; print a space if no '^'
	call	ilprt		; and finish off
	db	'  - Transmit escape character\t      '
	db	'?   - Print this help\r\n'
	db	'.   - Send a break\t\t\t'
	db	',   - Hang up modem\r\n'
	db	'B   - Change baud rate and mode\t\t'
	db	'C   - Open an input catch file\r\n'
	db	'D   - Display local directory\t\t'
	db	'E   - Toggle remote echo\r\n'
	db	'H   - Toggle half duplex\t\t'
	db	'I   - Print settings information\r\n'
	db	'J   - Junk control characters\t\t'
	db	'K   - Load a function key\r\n'
	db	'L   - Toggle linefeed transmit for \'P\'\t'
	db	'M   - Toggle bit 7 mask\r\n'
	db	'N   - Select new default drive / user\t'
	db	'O   - Toggle output to printer\r\n'
	db	'P   - Print a file to remote\t\t'
	db	'Q   - Quit\r\n'
	db	'R   - Receive a file using protocol\t'
	db	'S   - Send a file using protocol\r\n'
	db	'T   - Type a local file\t\t\t'
	db	'U   - Invoke user function\r\n'
	db	'V   - Toggle VT100 Emulation\t\t'
	db	'W   - Toggle split window mode\r\n'
	db	'X   - Activate a chat script\t\t'
	db	'Y   - Put catch file on hold\r\n'
	db	'Z   - Close catch file\t\t\t'
	db	'0-9 - Send function key string\r\n'
	db	0
	ret

.extern	info			; print current settings
info:
	call	ilprt
	db	'\r\nEscape character:\t\0'
	call	dim
	call	presc		; print the escape character
	call	ilprt
	db	'\r\nCurrent drive / user:\t\0'
	call	dim
	ld	hl,(curusr)	; get the current drive & user
	ld	a,h
	add	a,'A'		; convert drive to a letter
	ld	c,a
	push	hl
	call	scrout		; print the drive
	pop	hl
	call	decob		; and print the user in l
	call	ilprt
	db	':\r\n\0'
	ld	a,(rate)
	cp	' '
	jr	z,norate
	call	ilprt
	db	'Baud rate:\t\t\0'
	call	dim
	ld	hl,rate
	call	prtslp
norate:	ld	a,(modsav)
	cp	' '
	jr	z,nomode
	call	ilprt
	db	'Communication Mode:\t\0'
	call	dim
	ld	hl,modsav
	call	prtslp
nomode:	call	ilprt
	db	'^S delay:\t\t\0'
	call	dim
	ld	hl,(csdely)	; get the delay count
	call	decob		; out it goes
	call	ilprt
	db	' second(s)\r\nHalf duplex:\t\t\0'
	ld	a,(hflg)
	call	onoff		; say whether HDX is on or off
	call	ilprt
	db	'Local echo:\t\t\0'
	ld	a,(eflg)
	call	onoff		; say what local echo is up to
	call	ilprt
	db	'Control char. discard:\t\0'
	ld	a,(jflg)
	call	onoff		; say what local echo is up to
	call	ilprt
	db	'Linefeed in \'P\':\t\0'
	ld	a,(lflg)
	call	onoff		; line feed in print
	call	ilprt
	db	'Character delay:\t\0'
	call	dim
	ld	hl,(chd)	; get the character delay
	call	decob		; out it goes
	call	ilprt
	db	' msec. \0'
	ld	a,(ecflg)
	or	a
	jr	z,noeci
	call	ilprt
	db	'\techo check\0'
noeci:	call	ilprt
	db	'\r\nNew line delay:\t\t\0'
	call	dim
	ld	hl,(nld)	; new line delay is a word
	call	decout
	call	ilprt
	db	' msec. \0'
	ld	a,(lfecho)
	or	a
	jr	z,nolfe
	push	af
	call	ilprt
	db	'\tnewline echo: \'\0'
	call	dim
	pop	af
	ld	c,a
	call	scrout
	ld	c,'\''
	call	scrout
nolfe:	call	ilprt
	db	'\r\nBit 7 masking:\t\t\0'
	ld	a,(bmask)
	inc	a
	call	onoff		; say what bit 7 masking is up to
	call	ilprt
	db	'VT100 emulation:\t\0'
	ld	a,(vflg)
	call	onoff		; and vt100 emulation
	call	ilprt
	db	'Printer output:\t\t\0'
	ld	a,(oflg)
	call	onoff		; and printer output
	ld	a,(cflg)
	or	a
	jr	nz,isctch	; catch file active?
	call	ilprt		; if not then say so
	db	'Not catching\r\n\0'
	ret
isctch:	call	ilprt
	db	'Current catch file:\t\0'
	call	dim
	ld	hl,cfcb
	call	prtfl		; otherwise print the filename
	ld	a,(cflg)
	dec	a
	jp	z,crlf		; if active we're done
	call	ilprt		; else say it's on hold
	db	'  (on hold)\r\n\0'
	ret

onoff:	or	a		; is the flag active
	jr	z,proff		; jump if not
	call	ilprt
	db	'on\r\n\0'	; say it's on
	ret
proff:	call	ilprt
	db	'off\r\n\0'	; or say it's off
	ret

.extern	presc
presc:
	ld	b,0
	ld	a,(escval)	; get the escape character
	cp	' '
	jr	c,prthat	; it's a control char - print the ^
	cp	0x7f
	jr	nz,nohat	; also do that for deletes
prthat:	ld	c,'^'
	push	af		; save the escape val
	call	scrout		; print the ^
	pop	af
	ld	b,64		; flag we printed the ^
	xor	b		; and "uncontrollify" the char
nohat:	ld	c,a
	push	bc		; save flag
	call	scrout		; print the char
	pop	af		; flag back to a
	ret

.extern	quit
quit:
	call	cclose		; close catch file if open
	ld	hl,23 * 256	; blh corner of screen
	call	moveto		; go there
	call	exit		; call custom unwind code
	rst	0		; exit to cp/m

.extern	conin			; get char from function key or keyboard
conin:
	ld	a,(fkdely)	; check if we need to delay
	or	a
	call	nz,tnthip	; idle a while if we do
	ld	hl,(fkptr)
	ld	a,(hl)		; get the next char
	inc	hl
	ld	(fkptr),hl	; save revised pointer
	ret			; char is in a

.extern	ctls
ctls:
	ld	a,(lxoff)	; get local xon / xoff status
	or	a
	ld	a,(cschr)
	call	nz,modopc	; send the xoff if needed
	ld	a,(csdely)
	or	a
	ret	z		; if it's zero, return right now
	ld	b,a		; get the delay value
	add	a,a
	add	a,a
	add	a,b
	add	a,a		; * 10
	ld	b,a		; to b
waitlp:	push	bc
	call	tenth		; wait a while
	pop	bc
	djnz	waitlp
	ret

.extern	gotxon			; flag that an xon was sent from the kbd,
gotxon:				; so we don't re-send
	ld	(lxoff),a	; set the local xoff flag
	ret

.extern	gotxof			; flag that an xof was sent: this just clears
gotxof:				; the flag set in gotxon
	ld	hl,lxoff
	ld	(hl),0
	ret

.extern	areabp			; areabp used in chat scripts: point at first
areabp:				; non-white in text of a '!' command
	ld	hl,area	- 1	; point at chat parse area and fall into byp

.extern	incbyp
incbyp:				; inc hl, and then byp
	inc	hl

.extern	byp			; step over spaces in string pointed to by hl
byp:
	ld	a,(hl)
	cp	' '
	ret	nz		; return on the first char that is NOT a space
	inc	hl
	jr	byp

.extern	ldfnk			; this will prompt and then use the string
ldfnk:				; to program one of the 10 function keys
	ld	hl,zero		; point the readback pointer at a zero
	ld	(fkptr),hl	; in case we change the string under it
	call	prompt
	db	'Key value: \0'	; get the string
	ld	hl,ipbuf
	call	byp		; strip spaces
	or	a
	ret	z		; skip if nothing to do
	cp	'\e'
	ret	z		; or if an escape typed
	ld	c,0		; clear c (will become slow/fast flag)
	sub	'0'
	cp	10
	jr	c,fast		; 0-9: is a fast, key index in a
	ld	c,a		; non-digit: save a non-zero in c
	inc	hl
	ld	a,(hl)		; get the next character
	sub	'0'		; and turn it into an index
fast:	cp	10
	jr	c,fnkok		; check it's ok
	call	ilprt		; complain and return if not
	db	'Invalid function key number\r\n\0'
	ret
fnkok:	inc	hl		; point at string to be parsed
	push	hl		; save input string address
	add	a,a
	add	a,a
	add	a,a
	add	a,a		; turn index into table offset
	ld	e,a
	ld	d,0		; goes in de
	ld	hl,fktbl
	add	hl,de		; get table entry address
	ld	(hl),c		; save speed flag
	inc	hl
	ex	de,hl		; string target address to de
	pop	hl		; text back to hl
	ld	bc,14 << 8	; 14 chars, zero byte delimits
	jp	parst		; go parse the string, and we're done

.extern	cbios			; call the entry point in the bios witn number
cbios:				; in a, saving ix and iy as we go
	push	ix
	push	iy
	call	#bios
	pop	iy
	pop	iy
	ret

#bios:				; offset is in a
	ld	hl,(1)		; get the warm boot value to hl
	ld	l,a		; modify with function number
	jp	(hl)		; go do the code

.dseg
optype:	db	0
bflag:	db	0
.extern	lxoff
lxoff:	db	1
.extern	prmpfl
prmpfl:	db	0
.extern	fkptr
fkptr:	dw	zero

.useg
pos:	ds	1
linec:	ds	1
pagerf:	ds	1
.extern	fkdely
fkdely:	ds	1
.extern	fktbl
fktbl:	ds	16 * 10