emailler/client/drivers/c64inputs.s

184 lines
3.9 KiB
ArmAsm

.export get_key
.export get_filtered_input
.export filter_text
.export filter_ip
.export filter_dns
.export filter_url
.export filter_number
.export check_for_abort_key
.export get_key_if_available
.export get_key_ip65
.importzp copy_src
.import ip65_process
.include "../inc/common.i"
.code
allowed_ptr=copy_src ;reuse zero page
;use C64 Kernel ROM function to read a key
;inputs: none
;outputs: A contains ASCII value of key just pressed
get_key:
jsr get_key_if_available
beq get_key
rts
;use C64 Kernel ROM function to read a key
;inputs: none
;outputs: A contains ASCII value of key just pressed (0 if no key pressed)
get_key_if_available=$f142 ;not officially documented - where F13E (GETIN) falls through to if device # is 0 (KEYBD)
;process inbound ip packets while waiting for a keypress
get_key_ip65:
jsr ip65_process
jsr get_key_if_available
beq get_key_ip65
rts
;check whether the RUN/STOP key is being pressed
;inputs: none
;outputs: sec if RUN/STOP pressed, clear otherwise
check_for_abort_key:
lda $cb ;current key pressed
cmp #$3F
bne @not_abort
@flush_loop:
jsr get_key_if_available
bne @flush_loop
lda $cb ;current key pressed
cmp #$3F
beq @flush_loop
sec
rts
@not_abort:
clc
rts
;cribbed from http://codebase64.org/doku.php?id=base:robust_string_input
;======================================================================
;Input a string and store it in GOTINPUT, terminated with a null byte.
;AX is a pointer to the allowed list of characters, null-terminated.
;set AX to $0000 for no filter on input
;max # of chars in y returns num of chars entered in y.
;======================================================================
; Main entry
get_filtered_input:
sty MAXCHARS
stax temp_allowed
;Zero characters received.
lda #$00
sta INPUT_Y
;Wait for a character.
@input_get:
jsr get_key_ip65
sta LASTCHAR
cmp #$14 ;Delete
beq @delete
cmp #$0d ;Return
beq @input_done
;End reached?
lda INPUT_Y
cmp MAXCHARS
beq @input_get
;Check the allowed list of characters.
ldax temp_allowed
stax allowed_ptr ;since we are reusing this zero page, it may not stil be the same value since last time!
ldy #$00
lda allowed_ptr+1 ;was the input filter point nul?
beq @input_ok
@check_allowed:
lda (allowed_ptr),y ;Overwritten
beq @input_get ;Reached end of list (0)
cmp LASTCHAR
beq @input_ok ;Match found
;Not end or match, keep checking
iny
jmp @check_allowed
@input_ok:
lda LASTCHAR ;Get the char back
ldy INPUT_Y
sta GOTINPUT,y ;Add it to string
jsr $ffd2 ;Print it
inc INPUT_Y ;Next character
;Not yet.
jmp @input_get
@input_done:
ldy INPUT_Y
beq @no_input
lda #$00
sta GOTINPUT,y ;Zero-terminate
clc
ldax #GOTINPUT
rts
@no_input:
sec
rts
; Delete last character.
@delete:
;First, check if we're at the beginning. If so, just exit.
lda INPUT_Y
bne @delete_ok
jmp @input_get
;At least one character entered.
@delete_ok:
;Move pointer back.
dec INPUT_Y
;Store a zero over top of last character, just in case no other characters are entered.
ldy INPUT_Y
lda #$00
sta GOTINPUT,y
;Print the delete char
lda #$14
jsr $ffd2
;Wait for next char
jmp @input_get
;=================================================
;Some example filters
;=================================================
filter_text:
.byte ",!#'()* "
filter_url:
.byte ":/%&?+$"
filter_dns:
.byte "-ABCDEFGHIJKLMNOPQRSTUVWXYZ"
filter_ip:
.byte "."
filter_number:
.byte "1234567890",0
;=================================================
.bss
temp_allowed: .res 2
MAXCHARS: .res 1
LASTCHAR: .res 1
INPUT_Y: .res 1
GOTINPUT: .res 40