2023-12-08 22:56:35 +01:00
|
|
|
.include "string.h65"
|
2023-12-16 02:41:19 +01:00
|
|
|
Export str, strf
|
2023-12-08 00:13:43 +01:00
|
|
|
|
|
|
|
|
.code
|
2023-12-23 14:18:15 +01:00
|
|
|
;;********************************************************************************
|
|
|
|
|
;; @function Format a string
|
|
|
|
|
;; @details
|
|
|
|
|
;; If there is no value to be read, the Pz will be set
|
|
|
|
|
;; Formats:
|
|
|
|
|
;; - x: unsigned hex integer (1 byte) -> 2 chars
|
|
|
|
|
;; - X: unsigned hex integer (2 byte) -> 4 chars TODO
|
|
|
|
|
;; - u: unsigned decimal integer (1 byte) TODO
|
|
|
|
|
;; - U: unsigned decimal integer (2 bytes) TODO
|
|
|
|
|
;; @param ARG0-1: Format string address
|
|
|
|
|
;; @param ARG2-3: Output string address
|
|
|
|
|
;; @param ARG4+: Additional parameters
|
|
|
|
|
;; @returns
|
|
|
|
|
;; @modifies: A, X, Y
|
|
|
|
|
;;********************************************************************************
|
2023-12-08 22:56:35 +01:00
|
|
|
out_idx := str::out_idx
|
|
|
|
|
fmt_idx := str::fmt_idx
|
2023-12-08 00:13:43 +01:00
|
|
|
.proc strf
|
|
|
|
|
stz out_idx
|
|
|
|
|
stz fmt_idx
|
|
|
|
|
ldy #0 ; position in string
|
|
|
|
|
ldx #0 ; index of format args
|
|
|
|
|
@loop:
|
|
|
|
|
ldy fmt_idx
|
|
|
|
|
lda (ARG0),y
|
|
|
|
|
beq @null
|
|
|
|
|
cmp #'%'
|
|
|
|
|
beq @percent
|
|
|
|
|
@normal_char: ; store A in output string
|
|
|
|
|
ldy out_idx
|
|
|
|
|
sta (ARG2),y
|
|
|
|
|
inc fmt_idx
|
|
|
|
|
inc out_idx
|
|
|
|
|
beq @out_overflow
|
|
|
|
|
bra @loop
|
|
|
|
|
@percent: ; check for format in next position
|
|
|
|
|
iny
|
|
|
|
|
sty fmt_idx
|
|
|
|
|
lda (ARG0),y
|
|
|
|
|
beq @null
|
|
|
|
|
; formats
|
|
|
|
|
cmp #'x'
|
|
|
|
|
beq @format_hex1
|
|
|
|
|
bra @normal_char
|
|
|
|
|
@format_hex1: ; 1 byte hex -> 2 chars
|
|
|
|
|
lda ARG4,x
|
|
|
|
|
phx
|
2023-12-16 02:41:19 +01:00
|
|
|
jsr str::uint8_to_hex_str
|
2023-12-08 00:13:43 +01:00
|
|
|
ldy out_idx
|
|
|
|
|
sta (ARG2),y ; most sig digit
|
|
|
|
|
iny
|
|
|
|
|
beq @out_overflow
|
|
|
|
|
txa
|
|
|
|
|
sta (ARG2),y ; least sig digit
|
|
|
|
|
iny
|
|
|
|
|
beq @out_overflow
|
|
|
|
|
sty out_idx
|
|
|
|
|
plx
|
|
|
|
|
inx ; 1 byte of args handeled
|
|
|
|
|
; bra @format_return
|
|
|
|
|
@format_return: ; increment fmt_idx to swallow the formating char
|
|
|
|
|
inc fmt_idx
|
|
|
|
|
bra @loop
|
|
|
|
|
@out_overflow: ; store 0 in last position
|
|
|
|
|
ldy #$ff
|
|
|
|
|
sty out_idx
|
|
|
|
|
@store_null:
|
|
|
|
|
lda #0
|
|
|
|
|
@null: ; store and return
|
|
|
|
|
ldy out_idx
|
|
|
|
|
sta (ARG2),y
|
|
|
|
|
@rts:
|
|
|
|
|
rts
|
|
|
|
|
.endproc
|
|
|
|
|
|
|
|
|
|
|
