mirror of
https://github.com/bobbimanners/emailler.git
synced 2024-11-12 14:04:34 +00:00
84 lines
1.6 KiB
ArmAsm
84 lines
1.6 KiB
ArmAsm
;text file parsing routines
|
|
; first call parser_init
|
|
; then call parser_skip_next
|
|
|
|
.export parser_init
|
|
.export parser_skip_next
|
|
.importzp copy_src
|
|
.importzp copy_dest
|
|
|
|
|
|
target_string=copy_src
|
|
search_string=copy_dest
|
|
|
|
.include "../inc/common.i"
|
|
.ifndef NB65_API_VERSION_NUMBER
|
|
.define EQU =
|
|
.include "../inc/nb65_constants.i"
|
|
.endif
|
|
|
|
.bss
|
|
temp_ptr: .res 2
|
|
|
|
.segment "SELF_MODIFIED_CODE"
|
|
get_next_byte:
|
|
current_string_ptr=get_next_byte+1
|
|
lda $ffff
|
|
inc current_string_ptr
|
|
bne :+
|
|
inc current_string_ptr+1
|
|
:
|
|
pha
|
|
pla ;reload A so flags are set correctly
|
|
rts
|
|
|
|
.code
|
|
|
|
;set up a string for parsing
|
|
;inputs: AX = pointer to (null terminated) string to be parsed
|
|
;outputs: none
|
|
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
|
|
; if sec (i.e. no match found), pointer stays in same place
|
|
parser_skip_next:
|
|
stax search_string
|
|
ldax current_string_ptr
|
|
stax temp_ptr
|
|
@check_string:
|
|
ldy #0
|
|
ldax current_string_ptr
|
|
stax target_string
|
|
@check_next_char:
|
|
lda (search_string),y
|
|
beq @matched
|
|
cmp (target_string),y
|
|
bne @not_matched
|
|
iny
|
|
bne @check_next_char
|
|
@matched:
|
|
;now skip 'y' bytes
|
|
|
|
@skip_byte:
|
|
jsr get_next_byte
|
|
dey
|
|
bne @skip_byte
|
|
|
|
ldax current_string_ptr
|
|
clc
|
|
rts
|
|
@not_matched:
|
|
jsr get_next_byte
|
|
bne @check_string
|
|
ldax temp_ptr
|
|
stax current_string_ptr
|
|
sec
|
|
rts
|