mirror of
https://github.com/bobbimanners/emailler.git
synced 2024-09-12 02:54:54 +00:00
112 lines
2.1 KiB
ArmAsm
112 lines
2.1 KiB
ArmAsm
; text file parsing routines
|
|
|
|
.export parse_integer
|
|
.export parse_hex_digits
|
|
|
|
.import mul_8_16
|
|
.importzp acc16
|
|
|
|
.include "zeropage.inc"
|
|
.include "../inc/common.i"
|
|
|
|
target_string = ptr2
|
|
|
|
|
|
.bss
|
|
|
|
temp_value: .res 2
|
|
|
|
|
|
.code
|
|
|
|
; parses a string, returns integer (up to 16 bits)
|
|
; inputs: AX points to a string containing an integer
|
|
; outputs: AX contains integer
|
|
parse_integer:
|
|
stax target_string
|
|
lda #0
|
|
sta temp_value
|
|
sta temp_value+1
|
|
tay
|
|
@parse_int:
|
|
lda (target_string),y
|
|
cmp #$30
|
|
bcc @end_of_int ; any non-decimal char should be treated as end of integer
|
|
cmp #$3A
|
|
bcs @end_of_int ; any non-decimal char should be treated as end of integer
|
|
|
|
ldax temp_value
|
|
stax acc16
|
|
lda #10
|
|
jsr mul_8_16
|
|
ldax acc16
|
|
stax temp_value
|
|
lda (target_string),y
|
|
sec
|
|
sbc #'0'
|
|
clc
|
|
adc temp_value
|
|
sta temp_value
|
|
bcc @no_rollover
|
|
inc temp_value+1
|
|
@no_rollover:
|
|
iny
|
|
bne @parse_int
|
|
@end_of_int:
|
|
ldax temp_value
|
|
clc
|
|
rts
|
|
|
|
; parses 2 hex digits, returns a byte
|
|
; inputs: X contains high nibble char, A contains low nibble char
|
|
; outputs: A contains byte
|
|
parse_hex_digits:
|
|
pha
|
|
txa
|
|
jsr parse_1_digit
|
|
asl
|
|
asl
|
|
asl
|
|
asl
|
|
sta temp_value
|
|
|
|
pla
|
|
jsr parse_1_digit
|
|
clc
|
|
adc temp_value
|
|
rts
|
|
|
|
parse_1_digit:
|
|
cmp #$3A
|
|
|
|
bcs @not_digit
|
|
sec
|
|
sbc #$30
|
|
rts
|
|
@not_digit:
|
|
ora #$20 ; make lower case
|
|
sec
|
|
sbc #'a'-10
|
|
rts
|
|
|
|
|
|
|
|
; -- LICENSE FOR string_utils.s --
|
|
; 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/
|
|
;
|
|
; 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.
|
|
;
|
|
; The Original Code is ip65.
|
|
;
|
|
; 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.
|
|
; -- LICENSE END --
|