mirror of
https://github.com/bobbimanners/emailler.git
synced 2024-11-15 17:09:16 +00:00
83 lines
1.4 KiB
ArmAsm
83 lines
1.4 KiB
ArmAsm
|
;########################
|
||
|
|
; helper routine to convert a string representing a dotted quad (IP address, netmask) into 4 octets
|
||
|
|
; written by jonno@jamtronix.com 2009
|
||
|
|
;
|
||
|
|
;########################
|
||
|
|
; to use -
|
||
|
|
; ldax with ptr of dotted quad string
|
||
|
|
; then call parse_dotted_quad
|
||
|
|
; on exit: carry flag is set if there was an error. if carry flag is clear, then dotted_quad_value will be set
|
||
|
|
;########################
|
||
|
|
|
||
|
|
|
||
|
|
.include "../inc/common.i"
|
||
|
|
|
||
|
|
|
||
|
|
.export parse_dotted_quad
|
||
|
|
.export dotted_quad_value
|
||
|
|
|
||
|
|
.bss
|
||
|
|
dotted_quad_value: .res 4
|
||
|
|
|
||
|
|
dotted_quad_ptr: .res 4
|
||
|
|
|
||
|
|
.code
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
parse_dotted_quad:
|
||
|
|
stax dotted_quad_ptr+1
|
||
|
|
|
||
|
|
lda #$AD ; $AD='LDA immediate'
|
||
|
|
sta dotted_quad_ptr
|
||
|
|
|
||
|
|
lda #$60 ; $60='RTS
|
||
|
|
sta dotted_quad_ptr+3
|
||
|
|
ldx #0
|
||
|
|
txa
|
||
|
|
sta dotted_quad_value
|
||
|
|
@each_byte:
|
||
|
|
jsr get_next_byte
|
||
|
|
cmp #0
|
||
|
|
beq @done
|
||
|
|
and #$7F ;turn off bit 7
|
||
|
|
cmp #'.'
|
||
|
|
beq @got_dot
|
||
|
|
sec
|
||
|
|
sbc #'0'
|
||
|
|
bcc @error
|
||
|
|
cmp #10
|
||
|
|
bcs @error
|
||
|
|
|
||
|
|
clc
|
||
|
|
ldy #10
|
||
|
|
@mul_by_y:
|
||
|
|
adc dotted_quad_value,x
|
||
|
|
bcs @error
|
||
|
|
dey
|
||
|
|
bne @mul_by_y
|
||
|
|
sta dotted_quad_value,x
|
||
|
|
jmp @each_byte
|
||
|
|
|
||
|
|
@got_dot:
|
||
|
|
inx
|
||
|
|
lda #0
|
||
|
|
sta dotted_quad_value,x
|
||
|
|
jmp @each_byte
|
||
|
|
@done:
|
||
|
|
cpx #3
|
||
|
|
bne @error
|
||
|
|
clc
|
||
|
|
rts
|
||
|
|
@error:
|
||
|
|
sec
|
||
|
|
rts
|
||
|
|
|
||
|
|
|
||
|
|
get_next_byte:
|
||
|
|
jsr dotted_quad_ptr
|
||
|
|
inc dotted_quad_ptr+1
|
||
|
|
bne :+
|
||
|
|
inc dotted_quad_ptr+2
|
||
|
|
:
|
||
|
|
rts
|