emailler/ip65/parser.s

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; text file parsing routines
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; first call parser_init
; then call parser_skip_next
.export parser_init
.export parser_skip_next
.include "zeropage.inc"
.include "../inc/common.inc"
target_string = ptr1
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:
current_string_ptr=get_next_byte+1
lda $ffff
inc current_string_ptr
bne :+
inc current_string_ptr+1
: pha
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pla ; reload A so flags are set correctly
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rts
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.code
; set up a string for parsing
; inputs: AX = pointer to (null terminated) string to be parsed
; outputs: none
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parser_init:
stax current_string_ptr
clc
rts
; advance pointer along till just past the next occurance of specified string
; inputs: AX= pointer to (null terminated) string to search for
; outputs: sec if search string not found
; 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
parser_skip_next:
stax search_string
ldax current_string_ptr
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stax temp_ptr
@check_string:
ldy #0
ldax current_string_ptr
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stax target_string
@check_next_char:
lda (search_string),y
beq @matched
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cmp (target_string),y
bne @not_matched
iny
bne @check_next_char
@matched:
; now skip 'y' bytes
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@skip_byte:
jsr get_next_byte
dey
bne @skip_byte
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ldax current_string_ptr
clc
rts
@not_matched:
jsr get_next_byte
bne @check_string
ldax temp_ptr
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stax current_string_ptr
sec
rts
; -- LICENSE FOR parser.s --
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; The contents of this file are subject to the Mozilla Public License
; Version 1.1 (the "License"); you may not use this file except in
; compliance with the License. You may obtain a copy of the License at
; http://www.mozilla.org/MPL/
;
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; Software distributed under the License is distributed on an "AS IS"
; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
; License for the specific language governing rights and limitations
; under the License.
;
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; The Original Code is ip65.
;
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; The Initial Developer of the Original Code is Jonno Downes,
; jonno@jamtronix.com.
; Portions created by the Initial Developer are Copyright (C) 2009
; Jonno Downes. All Rights Reserved.
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; -- LICENSE END --