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84 lines
1.6 KiB
ArmAsm
84 lines
1.6 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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.importzp copy_src
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.importzp copy_dest
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target_string=copy_src
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search_string=copy_dest
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.include "../inc/common.i"
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.ifndef NB65_API_VERSION_NUMBER
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.define EQU =
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.include "../inc/nb65_constants.i"
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.endif
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.bss
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temp_ptr: .res 2
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.segment "SELF_MODIFIED_CODE"
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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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:
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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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