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emailler/client/basic/bails.s

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.include "../inc/common.i"
.ifndef KPR_API_VERSION_NUMBER
.define EQU =
.include "../inc/kipper_constants.i"
.endif
VARTAB = $2D ;BASIC variable table storage
ARYTAB = $2F ;BASIC array table storage
FREETOP = $33 ;bottom of string text storage area
MEMSIZ = $37 ;highest address used by BASIC
VARNAM = $45 ;current BASIC variable name
VARPNT = $47 ; pointer to current BASIC variable value
SETNAM = $FFBD
SETLFS = $FFBA
OPEN = $FFC0
CHKIN = $FFC6
READST = $FFB7 ; read status byte
CHRIN = $FFCF ; get a byte from file
CLOSE = $FFC3
MEMTOP = $FE25
TXTPTR = $7A ;BASIC text pointer
IERROR = $0300
ICRUNCH = $0304 ;Crunch ASCII into token
IQPLOP = $0306 ;List
IGONE = $0308 ;Execute next BASIC token
CHRGET = $73
CHRGOT = $79
CHROUT = $FFD2
GETBYT = $B79E ;BASIC routine
GETPAR = $B7EB ;Get a 16,8 pair of numbers
CHKCOM = $AEFD
NEW = $A642
CLR = $A65E
NEWSTT = $A7AE
GETVAR = $B0E7 ;find or create a variable
FRMEVL = $AD9E ;evaluate expression
FRESTR = $B6A3 ;free temporary string
FRMNUM = $AD8A ;get a number
GETADR = $B7F7 ;convert number to 16 bit integer
INLIN = $A560 ; read a line from keyboard
VALTYP=$0D ;00=number, $FF=string
LINNUM = $14 ;Number returned by GETPAR
crunched_line = $0200 ;Input buffer
.import copymem
.importzp copy_src
.importzp copy_dest
.import dhcp_init
.import ip65_init
.import cfg_get_configuration_ptr
.import ip65_process
.import ip65_error
.import cfg_ip
.import cfg_dns
.import cfg_gateway
.import cfg_netmask
.import icmp_ping
.import icmp_echo_ip
.import dns_set_hostname
.import dns_resolve
.import dns_ip
.import print_a
.import print_cr
.import dhcp_server
.import cfg_mac
.import cs_driver_name
.import get_key_if_available
.import timer_read
.import native_to_ascii
.import ascii_to_native
.zeropage
temp: .res 2
temp2: .res 2
pptr=temp
.segment "STARTUP" ;this is what gets put at the start of the file on the C64
.word basicstub ; load address
basicstub:
.word @nextline
.word 2003 ;line number
.byte $9e ;SYS
.byte <(((relocate / 1000) .mod 10) + $30)
.byte <(((relocate / 100 ) .mod 10) + $30)
.byte <(((relocate / 10 ) .mod 10) + $30)
.byte <(((relocate ) .mod 10) + $30)
.byte 0
@nextline:
.word 0
relocate:
ldax #end_of_loader
stax copy_src
ldax #main_start
stax copy_dest
stax MEMSIZ
FS=$8000-main_start
ldax #FS
;copy memory
sta end
ldy #0
cpx #0
beq @tail
: lda (copy_src),y
sta (copy_dest),y
iny
bne :-
inc copy_src+1 ;next page
inc copy_dest+1 ;next page
dex
bne :-
@tail:
lda end
beq @done
: lda (copy_src),y
sta (copy_dest),y
iny
cpy end
bne :-
@done:
ldax #welcome_banner
jsr print
ldx #5 ;Copy CURRENT vectors
@copy_old_vectors_loop:
lda ICRUNCH,x
sta oldcrunch,x
dex
bpl @copy_old_vectors_loop
ldx #5 ;Copy CURRENT vectors
install_new_vectors_loop:
lda vectors,x
sta ICRUNCH,x
dex
bpl install_new_vectors_loop
;BASIC keywords installed, now bring up the ip65 stack
jsr ip65_init
@init_failed:
jsr $A644 ;do a "NEW"
jmp $A474 ;"READY" prompt
welcome_banner:
.byte "### BASIC ON BAILS ###",13
.byte 0
end: .res 1
end_of_loader:
.segment "MAINSTART"
main_start:
safe_getvar: ;if GETVAR doesn't find the desired variable name in the VARTABLE, a routine at $B11D will create it
;however that routine checks if the low byte of the return address of the caller is $2A. if it is,
;it assumes the caller is the routine at $AF28 which just wants to get the variable value, and
;returns a pointer to a dummy 'zero' pointer.
;so if user code that is calling GETVAR happens to be compiled to an address $xx28, it will
;trigger this check, and not create a new variable, which (from painful experience) will create
;a really nasty condition to debug!
;so vector to GETVAR via here, so the return address seen by $B11D is here, and never $xx28
jsr GETVAR
rts
.code
; CRUNCH -- If this is one of our keywords, then tokenize it
;
crunch:
jsr jmp_crunch ;First crunch line normally
ldy #05 ;Offset for KERNAL
;Y will contain line length+5
@loop:
sty temp
jsr isword ;Are we at a keyword?
bcs @gotcha
@next:
jsr nextchar
bne @loop ;Null byte marks end
sta crunched_line-3,Y ;00 line number
lda #$FF ;'tis what A should be
rts ;Buh-bye
; Insert token and crunch line
@gotcha:
ldx temp ;If so, A contains opcode
sta crunched_line-5,X
@move:
inx
lda crunched_line-5,Y
sta crunched_line-5,X ;Move text backwards
beq @next
iny
bpl @move
; ISWORD -- Checks to see if word is
; in table. If a word is found, then
; C is set, Y is one past the last char
; and A contains opcode. Otherwise,
; carry is clear.
;
; On entry, TEMP must contain current
; character position.
;
isword:
ldx #00
@loop:
ldy temp
@loop2:
lda keywords,x
beq @notmine
cmp #$E0
bcs @done ;Tokens are >=$E0
cmp crunched_line-5,Y
bne @next
iny ;Success! Go to next char
inx
bne @loop2
@next:
inx
lda keywords,x ;Find next keyword
cmp #$E0
bcc @next
inx
bne @loop ;And check again
@notmine:
clc
@done:
rts
; NEXTCHAR finds the next char
; in the buffer, skipping
; spaces and quotes. On
; entry, TEMP contains the
; position of the last spot
; read. On exit, Y contains
; the index to the next char,
; A contains that char, and Z is set if at end of line.
nextchar:
ldy temp
@loop:
iny
lda crunched_line-5,Y
beq @done
cmp #$8F ;REM
bne @cont
lda #00
@skip:
sta temp2 ;Find matching character
@loop2:
iny
lda crunched_line-5,Y
beq @done
cmp temp2
bne @loop2 ;Skip to end of line
beq @loop
@cont:
cmp #$20 ;space
beq @loop
cmp #$22 ;quote
beq @skip
@done:
rts
;
; LIST -- patches the LIST routine
; to list our new tokens correctly.
;
list:
cmp #$E0
bcc @notmine ;Not my token
cmp #HITOKEN
bcs @notmine
bit $0F ;Check for quote mode
bmi @notmine
sec
sbc #$DF ;Find the corresponding text
tax
sty $49
ldy #00
@loop:
dex
beq @done
@loop2:
iny
lda keywords,y
cmp #$E0
bcc @loop2
iny
bne @loop
@done:
lda keywords,y
cmp #$91 ;is it "ON"?
bne @not_on
lda #'O'
jsr CHROUT
lda #'N'
bne @skip
@not_on:
cmp #$9B ;is it "LIST"?
bne @not_list
lda #'L'
jsr CHROUT
lda #'I'
jsr CHROUT
lda #'S'
jsr CHROUT
lda #'T'
bne @skip
@not_list:
lda keywords,y
bmi @out ;is it >=$80?
@skip:
jsr CHROUT
iny
bne @done
@out:
cmp #$E0 ;It might be BASIC token
bcs @cont
ldy $49
@notmine:
and #$FF
jmp (oldlist)
@cont:
ldy $49
jmp $A700 ;Normal exit
;
; EXECUTE -- if this is one of our new
; tokens, then execute it.
execute:
jsr CHRGET
execute_a:
php
cmp #':' ;is it a colon?
beq execute;if so, skip over and go to next token
cmp #$8B ;is it 'IF'?
bne @not_if
lda #$E0 ;our dummy IF token
@not_if:
cmp #$E0
bcc @notmine
cmp #HITOKEN
bcs @notmine
plp
jsr @disp
jmp NEWSTT
@disp:
eor #$E0
asl ;multiply by 2
tax
lda token_routines+1,x
pha
lda token_routines,x
pha
jmp CHRGET ;exit to routine (via RTS)
@notmine:
plp
cmp #0 ;reset flags
jmp $A7E7
;the standard BASIC IF routine calls the BASIC EXECUTE routine directly,
;without going through the vector. That means an extended keyword following THEN
;will lead to a syntax error. So we have to reimpliment IF here
;this is taken from TransBASIC - The Transactor, vol 5, Issue 04 (March 1985) page 34
if_keyword:
jsr FRMEVL ;evaluate expression
jsr CHRGOT
cmp #$89 ;is next token GOTO?
beq @ok
lda #$A7 ;is next token THEN
jsr $AEFF ;will generate SYNTAX ERROR if not
@ok:
jsr CHRGOT
ldx $61 ;result of expression : 0 means false
bne @expression_was_true
jmp $A93B ;go to REM implementation - skips rest of line
@expression_was_true:
bcs @not_numeric;CHRGOT clears carry flag if current char is a number
jmp $A8A0 ;do a GOTO
@not_numeric:
pla
pla ;pop the return address off the stack
jsr CHRGOT
jmp execute_a ;execute current token
find_var:
sta VARNAM
stx VARNAM+1
jsr safe_getvar
ldy #0
rts
;emit the 4 bytes pointed at by AX as dotted decimals
emit_dotted_quad:
sta pptr
stx pptr + 1
ldy #0
lda (pptr),y
jsr emit_decimal
lda #'.'
jsr emit_a
ldy #1
lda (pptr),y
jsr emit_decimal
lda #'.'
jsr emit_a
ldy #2
lda (pptr),y
jsr emit_decimal
lda #'.'
jsr emit_a
ldy #3
lda (pptr),y
jsr emit_decimal
rts
emit_decimal: ;emit byte in A as a decimal number
pha
sta temp_bin ;save
sed ; Switch to decimal mode
lda #0 ; Ensure the result is clear
sta temp_bcd
sta temp_bcd+1
ldx #8 ; The number of source bits
:
asl temp_bin+0 ; Shift out one bit
lda temp_bcd+0 ; And add into result
adc temp_bcd+0
sta temp_bcd+0
lda temp_bcd+1 ; propagating any carry
adc temp_bcd+1
sta temp_bcd+1
dex ; And repeat for next bit
bne :-
cld ;back to binary
pla ;get back the original passed in number
bmi @emit_hundreds ; if N is set, the number is >=128 so emit all 3 digits
cmp #10
bmi @emit_units
cmp #100
bmi @emit_tens
@emit_hundreds:
lda temp_bcd+1 ;get the most significant digit
and #$0f
clc
adc #'0'
jsr emit_a
@emit_tens:
lda temp_bcd
lsr
lsr
lsr
lsr
clc
adc #'0'
jsr emit_a
@emit_units:
lda temp_bcd
and #$0f
clc
adc #'0'
jsr emit_a
rts
print:
sta pptr
stx pptr + 1
@print_loop:
ldy #0
lda (pptr),y
beq @done_print
jsr print_a
inc pptr
bne @print_loop
inc pptr+1
bne @print_loop ;if we ever get to $ffff, we've probably gone far enough ;-)
@done_print:
rts
extract_string:
jsr FRMEVL
jsr FRESTR ;if not string, will create type mismatch error
sta param_length
tay
lda #0
sta transfer_buffer,y
dey
@loop:
lda ($22),y
sta transfer_buffer,y
dey
bpl @loop
jmp FRESTR ;free up the temp string created by FRMEVL
;get a string value from BASIC command, turn into a 32 bit IP address,save it in the 4 bytes pointed at by AX
get_ip_parameter:
stax temp2
jsr extract_string
ldax #transfer_buffer
jsr dns_set_hostname
bcs @error
jsr dns_resolve
bcc @ok
@error:
ldax #address_resolution
jmp print_error
@ok:
ldax #dns_ip
ldx #4
@copy_dns_ip:
lda dns_ip,y
sta (temp2),y
iny
dex
bne @copy_dns_ip
rts
reset_string:
ldy #<string_buffer
sty current_output_ptr
ldy #>string_buffer
sty current_output_ptr+1
rts
print_dotted_quad:
jsr reset_string
jsr emit_dotted_quad
make_null_terminated_and_print:
lda #0
jsr emit_a
ldax #string_buffer
jmp print
print_mac:
jsr reset_string
jsr emit_mac
jmp make_null_terminated_and_print
;print 6 bytes printed at by AX as a MAC address
emit_mac:
stax pptr
ldy #0
@one_mac_digit:
tya ;just to set the Z flag
pha
beq @dont_print_colon
lda #':'
jsr emit_a
@dont_print_colon:
pla
tay
lda (pptr),y
jsr emit_hex
iny
cpy #06
bne @one_mac_digit
rts
emit_hex:
pha
pha
lsr
lsr
lsr
lsr
tax
lda hexdigits,x
jsr emit_a
pla
and #$0F
tax
lda hexdigits,x
jsr emit_a
pla
rts
print_hex:
jsr reset_string
jsr emit_hex
jmp make_null_terminated_and_print
print_error:
jsr print
ldax #error
jsr print
lda ip65_error
jsr print_hex
jsr print_cr
sec
rts
get_optional_byte:
jsr CHRGOT
beq @no_param ;leave X as it was
jsr CHKCOM ;make sure next char is a comma (and skip it)
jsr CHRGOT
beq @eol
jsr GETBYT
@no_param:
rts
@eol:
jmp $AF08 ;SYNTAX ERROR
ipcfg_keyword:
ldax #interface_type
jsr print
ldax #cs_driver_name
jsr print
jsr print_cr
ldax #mac_address_msg
jsr print
ldax #cfg_mac
jsr print_mac
jsr print_cr
ldax #ip_address_msg
jsr print
ldax #cfg_ip
jsr print_dotted_quad
jsr print_cr
ldax #netmask_msg
jsr print
ldax #cfg_netmask
jsr print_dotted_quad
jsr print_cr
ldax #gateway_msg
jsr print
ldax #cfg_gateway
jsr print_dotted_quad
jsr print_cr
ldax #dns_server_msg
jsr print
ldax #cfg_dns
jsr print_dotted_quad
jsr print_cr
ldax #dhcp_server_msg
jsr print
ldax #dhcp_server
jsr print_dotted_quad
jsr print_cr
rts
dhcp_keyword:
jsr dhcp_init
bcc @init_ok
jsr ip65_init ;if DHCP failed, then reinit the IP stack (which will reset IP address etc that DHCP messed with to default values)
@init_failed:
ldax #dhcp
jmp print_error
@init_ok:
rts
ping_keyword:
ldax #icmp_echo_ip
jsr get_ip_parameter
bcc @no_error
rts
@no_error:
;is there an optional parameter?
ldx #3
jsr get_optional_byte
stx ping_counter
ldax #pinging
jsr print
ldax #dns_ip
jsr print_dotted_quad
jsr print_cr
@ping_loop:
jsr icmp_ping
bcs @error
lda #'.'
@print_and_loop:
jsr print_a
lda $cb ;current key pressed
cmp #$3F ;RUN/STOP?
beq @done
dec ping_counter
bne @ping_loop
@done:
jmp print_cr
@error:
lda #'!'
jmp @print_and_loop
myip_keyword:
ldax #cfg_ip
jmp get_ip_parameter
dns_keyword:
ldax #cfg_dns
jmp get_ip_parameter
gateway_keyword:
ldax #cfg_gateway
jmp get_ip_parameter
netmask_keyword:
ldax #cfg_netmask
jmp get_ip_parameter
skip_comma_get_integer:
jsr CHRGOT
jsr CHKCOM ;make sure next char is a comma (and skip it)
get_integer:
jsr CHRGOT
beq @eol
jsr FRMNUM
jsr GETADR
ldax LINNUM
@no_param:
rts
@eol:
jmp $AF08 ;SYNTAX ERROR
hook_keyword:
jsr extract_string
ldax #transfer_buffer
jsr skip_comma_get_integer
stax handler_address
jsr find_hook
bcc @existing_entry
lda hooks
cmp #MAX_HOOKS
bmi @got_space
ldx #$10 ;OUT OF MEMORY
jmp $A437 ;print error
@got_space:
clc
lda #0
adc hooks
adc hooks
adc hooks
adc hooks
adc hooks
adc hooks
tay
inc hooks
@existing_entry:
;y now points to free slot in hook table
lda transfer_buffer
sta hook_table,y
lda transfer_buffer+1
sta hook_table+1,y
lda param_length
sta hook_table+2,y
lda hash
sta hook_table+3,y
lda handler_address
sta hook_table+4,y
lda handler_address+1
sta hook_table+5,y
rts
grok_keyword:
jsr extract_string
jsr find_hook
bcc @got_hook
ldx #$11 ;UNDEFED FUNCTION
jmp $A437 ;print error
@got_hook:
lda hook_table+4,y
ldx hook_table+5,y
jmp goto
goto:
sta $14
stx $15
jmp $a8a3 ;GOTO keyword
find_hook:
jsr calc_hash
ldy #0
ldx hooks
beq @done
@compare_one_entry:
lda transfer_buffer
cmp hook_table,y
bne @nope
lda transfer_buffer+1
cmp hook_table+1,y
bne @nope
lda param_length
cmp hook_table+2,y
bne @nope
lda hash
cmp hook_table+3,y
bne @nope
;found it!
clc
rts
@nope:
dex
beq @done
iny
iny
iny
iny
iny
iny
bne @compare_one_entry
@done:
sec
rts
calc_hash:
clc
lda #0
ldy param_length
beq @done
@loop:
adc transfer_buffer,y
dey
bne @loop
@done:
sta hash
rts
yield_keyword:
rts
gosub:
.rodata
vectors:
.word crunch
.word list
.word execute
; Keyword list
; Keywords are stored as normal text,
; followed by the token number.
; All tokens are >$80,
; so they easily mark the end of the keyword
hexdigits:
.byte "0123456789ABCDEF"
pinging:
.byte"PINGING ",0
interface_type:
.byte "INTERFACE : ",0
mac_address_msg:
.byte "MAC ADDRESS : ", 0
ip_address_msg:
.byte "IP ADDRESS : ", 0
netmask_msg:
.byte "NETMASK : ", 0
gateway_msg:
.byte "GATEWAY : ", 0
dns_server_msg:
.byte "DNS SERVER : ", 0
dhcp_server_msg:
.byte "DHCP SERVER : ", 0
address_resolution:
.byte "ADDRESS RESOLUTION",0
tftp:
.byte "TFTP",0
dhcp:
.byte "DHCP",0
connect:
.byte "CONNECT",0
error:
.byte " ERROR $",0
disconnected:
.byte 13,"DIS"
connected_msg:
.byte "CONNECTED",13,0
keywords:
.byte "IF",$E0 ;our dummy 'IF' entry takes $E0
.byte "IPCFG",$E1
.byte "DHCP",$E2
.byte "PING",$E3
.byte "MYIP",$E4
.byte "NETMASK",$E5
.byte "GATEWAY",$E6
.byte "DNS",$E7
.byte "HOOK",$E8
.byte "YIELD",$E9
.byte "GROK",$EA
.byte $00 ;end of list
HITOKEN=$EB
;
; Table of token locations-1
;
token_routines:
E0: .word if_keyword-1
E1: .word ipcfg_keyword-1
E2: .word dhcp_keyword-1
E3: .word ping_keyword-1
E4: .word myip_keyword-1
E5: .word netmask_keyword-1
E6: .word gateway_keyword-1
E7: .word dns_keyword-1
E8: .word hook_keyword-1
E9: .word yield_keyword-1
EA: .word grok_keyword-1
.segment "SELF_MODIFIED_CODE"
jmp_crunch: .byte $4C ;JMP
oldcrunch: .res 2 ;Old CRUNCH vector
oldlist: .res 2
oldexec: .res 2
emit_a:
current_output_ptr=emit_a+1
sta $ffff
inc string_length
inc current_output_ptr
bne :+
inc current_output_ptr+1
:
rts
MAX_HOOKS=4
hook_table:
.res MAX_HOOKS*6
;format is:
; $00/$01 first 2 chars of hook name
; $02 length of name
; $03 hash of name
; $04/$05 line number that hook handler starts at
hooks: .byte 0
.bss
string_length: .res 1
param_length: .res 1
temp_bin: .res 1
temp_bcd: .res 2
ping_counter: .res 1
string_buffer: .res 128
transfer_buffer: .res 256
handler_address: .res 2
hash: .res 1
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