106 lines
2.6 KiB
Plaintext
106 lines
2.6 KiB
Plaintext
.include "string.h65"
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.include "math.h65"
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Export str, strf, int8_to_hex_str
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.code
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;********************************************************************************
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; @function Format a string
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; @details
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; If there is no value to be read, the Pz will be set
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; Formats:
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; - x: unsigned hex integer (1 byte) -> 2 chars
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; - X: unsigned hex integer (2 byte) -> 4 chars TODO
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; - u: unsigned decimal integer (1 byte) TODO
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; - U: unsigned decimal integer (2 bytes) TODO
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; @param ARG0-1: Format string address
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; @param ARG2-3: Output string address
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; @param ARG4+: Additional parameters
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; @returns
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; @modifies: A, X, Y
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;********************************************************************************
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out_idx := str::out_idx
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fmt_idx := str::fmt_idx
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.proc strf
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stz out_idx
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stz fmt_idx
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ldy #0 ; position in string
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ldx #0 ; index of format args
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@loop:
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ldy fmt_idx
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lda (ARG0),y
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beq @null
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cmp #'%'
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beq @percent
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@normal_char: ; store A in output string
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ldy out_idx
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sta (ARG2),y
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inc fmt_idx
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inc out_idx
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beq @out_overflow
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bra @loop
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@percent: ; check for format in next position
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iny
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sty fmt_idx
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lda (ARG0),y
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beq @null
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; formats
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cmp #'x'
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beq @format_hex1
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bra @normal_char
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@format_hex1: ; 1 byte hex -> 2 chars
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lda ARG4,x
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phx
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jsr int8_to_hex_str
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ldy out_idx
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sta (ARG2),y ; most sig digit
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iny
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beq @out_overflow
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txa
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sta (ARG2),y ; least sig digit
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iny
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beq @out_overflow
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sty out_idx
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plx
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inx ; 1 byte of args handeled
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; bra @format_return
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@format_return: ; increment fmt_idx to swallow the formating char
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inc fmt_idx
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bra @loop
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@out_overflow: ; store 0 in last position
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ldy #$ff
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sty out_idx
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@store_null:
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lda #0
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@null: ; store and return
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ldy out_idx
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sta (ARG2),y
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@rts:
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rts
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.endproc
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;********************************************************************************
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; @function Convert a 1 byte number into two hex characters
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; @param A: Number to convert
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; @returns A: Most significant digit
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; @returns X: Least significant digit
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; @modifies A,X,Y
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;********************************************************************************
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.proc int8_to_hex_str
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pha
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and #%00001111
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tay
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ldx HEX_CHARS_UPPER,y
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pla
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div A,16
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and #%00001111
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tay
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lda HEX_CHARS_UPPER,y
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rts
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.endproc
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.rodata
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HEX_CHARS_UPPER: .byte "0123456789ABCDEF"
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HEX_CHARS_LOWER: .byte "0123456789abcdef"
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