mirror of
https://github.com/bobbimanners/emailler.git
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147 lines
2.9 KiB
ArmAsm
147 lines
2.9 KiB
ArmAsm
.export get_key
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.export get_filtered_input
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.export filter_text
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.export filter_ip
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.export filter_dns
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.export check_for_abort_key
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.importzp copy_src
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.include "../inc/common.i"
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.code
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allowed_ptr=copy_src ;reuse zero page
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;use C64 Kernel ROM function to read a key
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;inputs: none
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;outputs: A contains ASCII value of key just pressed
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get_key:
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jsr $ffe4
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beq get_key
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rts
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;check whether the RUN/STOP key is being pressed
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;inputs: none
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;outputs: sec if RUN/STOP pressed, clear otherwise
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check_for_abort_key:
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lda $cb ;current key pressed
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cmp #$3F
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bne :+
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sec
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rts
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:
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clc
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rts
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;cribbed from http://codebase64.org/doku.php?id=base:robust_string_input
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;======================================================================
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;Input a string and store it in GOTINPUT, terminated with a null byte.
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;x:a is a pointer to the allowed list of characters, null-terminated.
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;max # of chars in y returns num of chars entered in y.
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;======================================================================
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; Main entry
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get_filtered_input:
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sty MAXCHARS
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stax allowed_ptr
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;Zero characters received.
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lda #$00
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sta INPUT_Y
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;Wait for a character.
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INPUT_GET:
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jsr get_key
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sta LASTCHAR
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cmp #$14 ;Delete
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beq DELETE
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cmp #$0d ;Return
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beq INPUT_DONE
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;Check the allowed list of characters.
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ldy #$00
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CHECKALLOWED:
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lda (allowed_ptr),y ;Overwritten
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beq INPUT_GET ;Reached end of list (0)
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cmp LASTCHAR
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beq INPUTOK ;Match found
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;Not end or match, keep checking
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iny
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jmp CHECKALLOWED
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INPUTOK:
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lda LASTCHAR ;Get the char back
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ldy INPUT_Y
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sta GOTINPUT,y ;Add it to string
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jsr $ffd2 ;Print it
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inc INPUT_Y ;Next character
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;End reached?
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lda INPUT_Y
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cmp MAXCHARS
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beq INPUT_DONE
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;Not yet.
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jmp INPUT_GET
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INPUT_DONE:
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ldy INPUT_Y
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beq no_input
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lda #$00
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sta GOTINPUT,y ;Zero-terminate
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clc
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ldax #GOTINPUT
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rts
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no_input:
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sec
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rts
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; Delete last character.
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DELETE:
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;First, check if we're at the beginning. If so, just exit.
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lda INPUT_Y
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bne DELETE_OK
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jmp INPUT_GET
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;At least one character entered.
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DELETE_OK:
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;Move pointer back.
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dec INPUT_Y
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;Store a zero over top of last character, just in case no other characters are entered.
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ldy INPUT_Y
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lda #$00
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sta GOTINPUT,y
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;Print the delete char
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lda #$14
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jsr $ffd2
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;Wait for next char
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jmp INPUT_GET
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;=================================================
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;Some example filters
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;=================================================
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filter_text:
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.byte ",+!#$%&'()* "
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filter_dns:
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.byte " -ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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filter_ip:
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.byte "1234567890.",0
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;=================================================
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.bss
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MAXCHARS: .res 1
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LASTCHAR: .res 1
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INPUT_Y: .res 1
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GOTINPUT: .res 40
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