Category : Network Files
Archive   : TCP_SRC.ZIP
Filename : TERMIN.ASM

; Russell Nelson, Clarkson University. October 20, 1988
; Copyright, 1988, 1989, Russell Nelson

; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, version 1.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

include defs.asm

code segment word public
assume cs:code, ds:code

org 80h
phd_dioa label byte

org 100h
start:
jmp start_1

int_pkt macro
pushf
cli
call their_isr
endm

their_isr dd ?
packet_int_no db ?,?

handle dw ?

bogus_type db 1,2,3,4,5,6,7,8 ;totally bogus type code.

signature db 'PKT DRVR',0
signature_len equ $-signature

flagbyte db 0
S_OPTION equ 8

no_signature_msg db "termin: no packet driver at that address",'$'
usage_msg db "usage: termin ",'$'
ok_msg db "termin: terminate completed",'$'

usage_error:
mov dx,offset usage_msg
error:
mov ah,9
int 21h
int 20h

start_1:
mov si,offset phd_dioa+1
call skip_blanks ;end of line?
cmp al,CR
je usage_error

chk_options:
call skip_blanks
cmp al,'-' ; any options?
je more_opt
cmp al,'/'
jne no_more_opt
more_opt:
inc si ; skip past option char
lodsb ; read next char
or al,20h ; convert to lower case
cmp al,'s'
jne usage_error
or flagbyte,S_OPTION
jmp chk_options
no_more_opt:

mov di,offset packet_int_no
call get_number

mov ah,35h ;get their packet interrupt.
mov al,packet_int_no
int 21h
mov their_isr.offs,bx
mov their_isr.segm,es

lea di,3[bx]
mov si,offset signature
mov cx,signature_len
repe cmpsb
jne no_signature_err

push ds
mov ax,1ffh ;driver_info
int_pkt
pop ds
call fatal_error

mov ah,2 ;access_type
mov al,ch ;their class from driver_info().
mov bx,dx ;their type from driver_info().
mov dl,cl ;their number from driver_info().
mov cx,MAX_P_LEN ;use the max type length.
mov si,offset bogus_type
push cs ;es:di -> our receiver.
pop es
mov di,offset our_recv
int_pkt
call fatal_error
mov handle,ax


test flagbyte,S_OPTION
jz not_stop
mov ah,8 ; f_stop
int_pkt
jmp now_done
not_stop:


mov ah,5 ;terminate the driver.
mov bx,handle
int_pkt
jnc now_close
call print_error
now_close:
mov ah,3 ;release_type
mov bx,handle
int_pkt
jnc now_done ;if ok, we're done.
cmp dh,BAD_HANDLE ;if it succeeded, we'll get a bad handle.
je now_done ;it worked.
stc
call fatal_error
int 20h
now_done:
push cs
pop ds
lea dx,ok_msg
mov ah,9
int 21h
int 20h


our_recv:
or ax,ax ;first or second call?
jne our_recv_1 ;second -- we ignore the packet
push cs
pop es
mov di,offset our_buffer
our_recv_1:
db 0cbh ;masm 4.0 doesn't grok "retf"


no_signature_err:
mov dx,offset no_signature_msg
mov ah,9
int 21h
int 20h


include pkterr.asm
include getnum.asm
include skipblk.asm
include getdig.asm
include chrout.asm

our_buffer label byte

code ends

end start