102 lines
2.2 KiB
ArmAsm
102 lines
2.2 KiB
ArmAsm
; text file parsing routines
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; first call parser_init
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; then call parser_skip_next
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.export parser_init
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.export parser_skip_next
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.include "zeropage.inc"
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.include "../inc/common.inc"
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target_string = ptr1
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search_string = ptr2
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.bss
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temp_ptr: .res 2
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.data
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get_next_byte:
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current_string_ptr=get_next_byte+1
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lda $ffff
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inc current_string_ptr
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bne :+
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inc current_string_ptr+1
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: pha
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pla ; reload A so flags are set correctly
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rts
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.code
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; set up a string for parsing
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; inputs: AX = pointer to (null terminated) string to be parsed
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; outputs: none
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parser_init:
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stax current_string_ptr
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clc
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rts
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; advance pointer along till just past the next occurance of specified string
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; inputs: AX= pointer to (null terminated) string to search for
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; outputs: sec if search string not found
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; if clc, AX = pointer to first byte after string specified
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; if sec (i.e. no match found), pointer stays in same place
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parser_skip_next:
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stax search_string
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ldax current_string_ptr
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stax temp_ptr
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@check_string:
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ldy #0
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ldax current_string_ptr
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stax target_string
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@check_next_char:
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lda (search_string),y
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beq @matched
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cmp (target_string),y
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bne @not_matched
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iny
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bne @check_next_char
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@matched:
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; now skip 'y' bytes
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@skip_byte:
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jsr get_next_byte
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dey
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bne @skip_byte
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ldax current_string_ptr
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clc
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rts
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@not_matched:
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jsr get_next_byte
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bne @check_string
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ldax temp_ptr
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stax current_string_ptr
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sec
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rts
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; -- LICENSE FOR parser.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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