157 lines
3.5 KiB
ArmAsm
157 lines
3.5 KiB
ArmAsm
.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 filter_url
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.export filter_number
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.import get_key
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.include "zeropage.inc"
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.include "../inc/common.inc"
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allowed_ptr = ptr1
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.code
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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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; AX is a pointer to the allowed list of characters, null-terminated.
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; set AX to $0000 for no filter on input
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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 temp_allowed
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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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; End reached?
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lda INPUT_Y
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cmp MAXCHARS
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beq @input_get
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; Check the allowed list of characters.
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ldax temp_allowed
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stax allowed_ptr ; Since we are reusing this zero page, it may not stil be the same value since last time!
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ldy #$00
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lda allowed_ptr+1 ; Was the input filter point nul?
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beq @input_ok
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@check_allowed:
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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 @input_ok ; Match found
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; Not end or match, keep checking
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iny
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jmp @check_allowed
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@input_ok:
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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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; 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 $ffd2
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; Wait for next char
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jmp @input_get
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; =================================================
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; Some example filters
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; =================================================
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filter_text:
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.byte ",!#'()* "
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filter_url:
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.byte ":/%&?+$"
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filter_dns:
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.byte "-ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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filter_ip:
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.byte "."
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filter_number:
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.byte "1234567890",0
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.bss
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temp_allowed: .res 2
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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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; -- LICENSE FOR vic20filteredinput.s --
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; The contents of this file are subject to the Mozilla Public License
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; Version 1.1 (the "License"); you may not use this file except in
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; compliance with the License. You may obtain a copy of the License at
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; http://www.mozilla.org/MPL/
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;
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; Software distributed under the License is distributed on an "AS IS"
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; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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; License for the specific language governing rights and limitations
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; under the License.
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;
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; The Original Code is ip65.
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;
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; The Initial Developer of the Original Code is Jonno Downes,
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; jonno@jamtronix.com.
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; Portions created by the Initial Developer are Copyright (C) 2009
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; Jonno Downes. All Rights Reserved.
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; -- LICENSE END --
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