title	"logoff program for tShell"
;
;	(c) 1985 S. Kluger. All Rights Reserved.
;	history:
;	12/15/85	initially written. complete except mail check.
;
.z80
.request syslib
;
cr	equ	0dh
lf	equ	0ah
cfunc	equ	5
tfunc	equ	50h
;
	dseg
;
	include	TSHELL.DEF
;
logfcb:	db	1,'TSHELL  LOG',0,0,0,0
	ds	22
actlog:
	db	1ah
actid:	ds	8			; activity log user id
actdt:	ds	4			;   date/time
actst:	ds	2			;   station
act01:	db	0			;   on/off/bad flag (1/0/FF)
actdu:	ds	2			;   drive/user
actbp:	ds	8			;   bad password given
	db	1ah,1ah,1ah,1ah,1ah,1ah	; filler
;
id:	db	'.tShell.'
offset:	db	0
	ds	80
stack	equ	$
;
	cseg
;
start:	ld	sp,stack
	ld	de,80h
	ld	hl,id
	ld	bc,8
	ldir
	ld	bc,41
	ld	l,0
	call	tfunc
	ld	(offset),a		; save offset
	or	a
	jp	z,fatal			; fatal error if no USR FCN
	ld	c,8
	ld	de,abort
	call	tfunc
	ld	c,18
	ld	de,0			; clear all stacked command lines
	call	tfunc
	ld	de,LCLID
	ld	c,26
	call	cfunc			; set dma
	ld	bc,41
	ld	l,0			; get user data
	call	getoff
	call	tfunc
	ld	bc,41
	ld	de,0ffffh
	ld	l,4			; enable user 31 access
	call	getoff
	call	tfunc
	ld	c,32
	ld	e,0ffh			; get user area
	call	cfunc
	push	af			; save it for now
	ld	c,32
	ld	e,31
	call	cfunc
	ld	hl,LCLID		; move userid
	ld	de,actid
	ld	bc,8
	ldir
	ld	c,10			; get date/time
	call	tfunc
	ld	(actdt),hl
	ld	(actdt+2),de
	ld	c,12			; get station
	call	cfunc
	ld	(actst),de
	xor	a
	ld	(act01),a		; set logoff flag
	ld	c,25
	call	cfunc
	ld	h,a			; set drive
	pop	af
	ld	l,a			; set user
	ld	(actdu),hl
	call	applog			; write if log enabled
	ld	bc,41			; first log off tShell
	ld	de,0ffffh
	ld	l,2
	call	getoff
	call	tfunc
	ld	c,14
	ld	de,0ffffh
	call	tfunc
	ld	c,17
	ld	e,0ffh
	call	tfunc
	call	print##
	cr,lf,lf
	'*** logged off ***',cr,lf,lf,0
	rst	0
;
; append to activity log
;
applog:	ld	de,logfcb		; point to log
	ld	c,35			; filesize
	call	cfunc
	or	a
	ret	nz			; ignore file not found
	ld	c,10
	call	tfunc			; get date/time
	ld	(actdt),hl
	ld	(actdt+2),de
	ld	c,12
	call	cfunc			; get station
	ld	(actst),de
	ld	hl,(logfcb+33)
	dec	hl
	ld	(logfcb+33),hl		; decrement file pointer
	ld	de,logfcb
	call	openf			; open shared
	ld	de,80h			; set defdma
	ld	c,26
	call	cfunc
	ld	de,logfcb
	call	rdsec			; read last sector
	ld	hl,80h			; hl=pointer to def dma
	ld	de,20h			; de=byte count
..ckel:	ld	a,(hl)			; get byte
	cp	0ffh			; endmark?
	jr	z,.fe..			;   yes
	add	hl,de
	ld	a,l
	or	a
	jr	nz,..ckel		; try next entry
	ld	hl,(logfcb+33)
	inc	hl
	ld	(logfcb+33),hl
	ld	hl,80h			; set start of buffer
	push	hl
.zac.:	ld	(hl),0ffh		; blank buffer
	inc	l
	jr	nz,.zac.
	pop	hl
.fe..:	ld	de,actlog
	ex	de,hl
	ld	bc,32			; 32 bytes to be moved
	ldir
	ld	a,l			; see if end of buffer
	or	a
	jr	z,.eob.			; yes, skip
	ld	(hl),0ffh		;   else set endmark
.eob.:	ld	de,logfcb
	call	wrsec			; write the sector
	ld	de,logfcb
	ld	c,16
	jp	cfunc			; close and exit
;
; open file with lock
;
openf:	ld	hl,5			; point to shared flag
	add	hl,de
	ld	a,80h
	or	(hl)
	ld	(hl),a			; set shared flag
	push	de
	ld	c,15
	call	cfunc
	pop	de
	ld	hl,32
	add	hl,de
	ld	(hl),0
	or	a
	ret	z			; file is now open
	jr	openf			; else loop since we know file exists
;
; read a sector - enter with hl = sector, de = fcb
;
rdsec:	call	loksec			; lock sector
	push	de
	ld	c,33			; read
	call	cfunc
	or	a			; set error flag
	jr	fresec			; free sector
;
; write a sector - enter with hl = sector, de=fcb
;
wrsec:	call	loksec			; lock sector
	push	de			; save fcb
	ld	c,34			; write
	call	cfunc
	or	a			; set error flag
;
; free current file sector
;
fresec:	pop	de
	push	af
	ld	c,43
	call	cfunc
	pop	af
	ret
;
; lock current file sector
;
loksec:	push	de			; save fcb pointer
	ld	c,42			; attempt lock
	call	cfunc
	pop	de
	cp	8			; locked already?
	jr	z,loksec		;   yes, loop
abort:	ret
;
getoff:	ld	a,(offset)
	add	a,l
	ld	l,a
	ret
;
fatal:	call	print##
	cr,lf,lf,7
	'ERROR: tShell not installed',cr,lf,lf,0
	rst	0
;
	end