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0349d1d57c
prog8/compiler/res/prog8lib/prog8_lib.asm
Irmen de Jong a735939d1e removed confusing GPL software license reference and copyright header from library files. (because of exclusion in output files) 
Reworded software license and exclusion clause somewhat again in attempt to make it even clearer.
2022-05-30 20:12:20 +02:00

1210 lines
22 KiB
NASM
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; Internal library routines - always included by the compiler
; Generic machine independent 6502 code.
orig_stackpointer .byte 0 ; stores the Stack pointer register at program start
read_byte_from_address_on_stack .proc
; -- read the byte from the memory address on the top of the stack, return in A (stack remains unchanged)
lda P8ESTACK_LO+1,x
ldy P8ESTACK_HI+1,x
sta P8ZP_SCRATCH_W2
sty P8ZP_SCRATCH_W2+1
ldy #0
lda (P8ZP_SCRATCH_W2),y
rts
.pend
write_byte_to_address_on_stack .proc
; -- write the byte in A to the memory address on the top of the stack (stack remains unchanged)
ldy P8ESTACK_LO+1,x
sty P8ZP_SCRATCH_W2
ldy P8ESTACK_HI+1,x
sty P8ZP_SCRATCH_W2+1
ldy #0
sta (P8ZP_SCRATCH_W2),y
rts
.pend
neg_b .proc
lda #0
sec
sbc P8ESTACK_LO+1,x
sta P8ESTACK_LO+1,x
rts
.pend
neg_w .proc
sec
lda #0
sbc P8ESTACK_LO+1,x
sta P8ESTACK_LO+1,x
lda #0
sbc P8ESTACK_HI+1,x
sta P8ESTACK_HI+1,x
rts
.pend
inv_word .proc
lda P8ESTACK_LO+1,x
eor #255
sta P8ESTACK_LO+1,x
lda P8ESTACK_HI+1,x
eor #255
sta P8ESTACK_HI+1,x
rts
.pend
not_byte .proc
lda P8ESTACK_LO+1,x
beq +
lda #1
+ eor #1
sta P8ESTACK_LO+1,x
rts
.pend
not_word .proc
lda P8ESTACK_LO + 1,x
ora P8ESTACK_HI + 1,x
beq +
lda #1
+ eor #1
sta P8ESTACK_LO + 1,x
lsr a
sta P8ESTACK_HI + 1,x
rts
.pend
bitand_b .proc
; -- bitwise and (of 2 bytes)
lda P8ESTACK_LO+2,x
and P8ESTACK_LO+1,x
inx
sta P8ESTACK_LO+1,x
rts
.pend
bitor_b .proc
; -- bitwise or (of 2 bytes)
lda P8ESTACK_LO+2,x
ora P8ESTACK_LO+1,x
inx
sta P8ESTACK_LO+1,x
rts
.pend
bitxor_b .proc
; -- bitwise xor (of 2 bytes)
lda P8ESTACK_LO+2,x
eor P8ESTACK_LO+1,x
inx
sta P8ESTACK_LO+1,x
rts
.pend
bitand_w .proc
; -- bitwise and (of 2 words)
lda P8ESTACK_LO+2,x
and P8ESTACK_LO+1,x
sta P8ESTACK_LO+2,x
lda P8ESTACK_HI+2,x
and P8ESTACK_HI+1,x
sta P8ESTACK_HI+2,x
inx
rts
.pend
bitor_w .proc
; -- bitwise or (of 2 words)
lda P8ESTACK_LO+2,x
ora P8ESTACK_LO+1,x
sta P8ESTACK_LO+2,x
lda P8ESTACK_HI+2,x
ora P8ESTACK_HI+1,x
sta P8ESTACK_HI+2,x
inx
rts
.pend
bitxor_w .proc
; -- bitwise xor (of 2 bytes)
lda P8ESTACK_LO+2,x
eor P8ESTACK_LO+1,x
sta P8ESTACK_LO+2,x
lda P8ESTACK_HI+2,x
eor P8ESTACK_HI+1,x
sta P8ESTACK_HI+2,x
inx
rts
.pend
and_b .proc
; -- logical and (of 2 bytes)
lda P8ESTACK_LO+2,x
beq +
lda #1
+ sta P8ZP_SCRATCH_B1
lda P8ESTACK_LO+1,x
beq +
lda #1
+ and P8ZP_SCRATCH_B1
inx
sta P8ESTACK_LO+1,x
rts
.pend
or_b .proc
; -- logical or (of 2 bytes)
lda P8ESTACK_LO+2,x
ora P8ESTACK_LO+1,x
beq +
lda #1
+ inx
sta P8ESTACK_LO+1,x
rts
.pend
xor_b .proc
; -- logical xor (of 2 bytes)
lda P8ESTACK_LO+2,x
beq +
lda #1
+ sta P8ZP_SCRATCH_B1
lda P8ESTACK_LO+1,x
beq +
lda #1
+ eor P8ZP_SCRATCH_B1
inx
sta P8ESTACK_LO+1,x
rts
.pend
and_w .proc
; -- logical and (word and word -> byte)
lda P8ESTACK_LO+2,x
ora P8ESTACK_HI+2,x
beq +
lda #1
+ sta P8ZP_SCRATCH_B1
lda P8ESTACK_LO+1,x
ora P8ESTACK_HI+1,x
beq +
lda #1
+ and P8ZP_SCRATCH_B1
inx
sta P8ESTACK_LO+1,x
sta P8ESTACK_HI+1,x
rts
.pend
or_w .proc
; -- logical or (word or word -> byte)
lda P8ESTACK_LO+2,x
ora P8ESTACK_LO+1,x
ora P8ESTACK_HI+2,x
ora P8ESTACK_HI+1,x
beq +
lda #1
+ inx
sta P8ESTACK_LO+1,x
sta P8ESTACK_HI+1,x
rts
.pend
xor_w .proc
; -- logical xor (word xor word -> byte)
lda P8ESTACK_LO+2,x
ora P8ESTACK_HI+2,x
beq +
lda #1
+ sta P8ZP_SCRATCH_B1
lda P8ESTACK_LO+1,x
ora P8ESTACK_HI+1,x
beq +
lda #1
+ eor P8ZP_SCRATCH_B1
inx
sta P8ESTACK_LO+1,x
sta P8ESTACK_HI+1,x
rts
.pend
add_w .proc
; -- push word+word / uword+uword
inx
clc
lda P8ESTACK_LO,x
adc P8ESTACK_LO+1,x
sta P8ESTACK_LO+1,x
lda P8ESTACK_HI,x
adc P8ESTACK_HI+1,x
sta P8ESTACK_HI+1,x
rts
.pend
sub_w .proc
; -- push word-word
inx
sec
lda P8ESTACK_LO+1,x
sbc P8ESTACK_LO,x
sta P8ESTACK_LO+1,x
lda P8ESTACK_HI+1,x
sbc P8ESTACK_HI,x
sta P8ESTACK_HI+1,x
rts
.pend
mul_byte .proc
; -- b*b->b (signed and unsigned)
inx
lda P8ESTACK_LO,x
ldy P8ESTACK_LO+1,x
jsr math.multiply_bytes
sta P8ESTACK_LO+1,x
rts
.pend
mul_word .proc
inx
lda P8ESTACK_LO,x
sta P8ZP_SCRATCH_W1
lda P8ESTACK_HI,x
sta P8ZP_SCRATCH_W1+1
lda P8ESTACK_LO+1,x
ldy P8ESTACK_HI+1,x
jsr math.multiply_words
lda math.multiply_words.result
sta P8ESTACK_LO+1,x
lda math.multiply_words.result+1
sta P8ESTACK_HI+1,x
rts
.pend
idiv_b .proc
; signed division: use unsigned division and fix sign of result afterwards
inx
lda P8ESTACK_LO,x
eor P8ESTACK_LO+1,x
php ; save sign of result
lda P8ESTACK_LO,x
bpl +
eor #$ff
sec
adc #0 ; make num1 positive
+ tay
inx
lda P8ESTACK_LO,x
bpl +
eor #$ff
sec
adc #0 ; make num2 positive
+ jsr math.divmod_ub_asm
sta _remainder
tya
plp ; get sign of result
bpl +
eor #$ff
sec
adc #0 ; negate result
+ sta P8ESTACK_LO,x
dex
rts
_remainder .byte 0
.pend
idiv_ub .proc
inx
ldy P8ESTACK_LO,x
lda P8ESTACK_LO+1,x
jsr math.divmod_ub_asm
tya
sta P8ESTACK_LO+1,x
rts
.pend
idiv_w .proc
; signed division: use unsigned division and fix sign of result afterwards
lda P8ESTACK_HI+2,x
eor P8ESTACK_HI+1,x
php ; save sign of result
lda P8ESTACK_HI+1,x
bpl +
jsr neg_w ; make value positive
+ inx
lda P8ESTACK_HI+1,x
bpl +
jsr neg_w ; make value positive
+ lda P8ESTACK_LO+1,x
sta P8ZP_SCRATCH_W1
lda P8ESTACK_HI+1,x
sta P8ZP_SCRATCH_W1+1
lda P8ESTACK_LO,x
ldy P8ESTACK_HI,x
jsr math.divmod_uw_asm
sta P8ESTACK_LO+1,x
tya
sta P8ESTACK_HI+1,x
plp
bpl +
jmp neg_w ; negate result
+ rts
.pend
idiv_uw .proc
inx
lda P8ESTACK_LO+1,x
sta P8ZP_SCRATCH_W1
lda P8ESTACK_HI+1,x
sta P8ZP_SCRATCH_W1+1
lda P8ESTACK_LO,x
ldy P8ESTACK_HI,x
jsr math.divmod_uw_asm
sta P8ESTACK_LO+1,x
tya
sta P8ESTACK_HI+1,x
rts
.pend
remainder_ub .proc
inx
ldy P8ESTACK_LO,x ; right operand
lda P8ESTACK_LO+1,x ; left operand
jsr math.divmod_ub_asm
sta P8ESTACK_LO+1,x
rts
.pend
remainder_uw .proc
inx
lda P8ESTACK_LO+1,x
sta P8ZP_SCRATCH_W1
lda P8ESTACK_HI+1,x
sta P8ZP_SCRATCH_W1+1
lda P8ESTACK_LO,x
ldy P8ESTACK_HI,x
jsr math.divmod_uw_asm
lda P8ZP_SCRATCH_W2
sta P8ESTACK_LO+1,x
lda P8ZP_SCRATCH_W2+1
sta P8ESTACK_HI+1,x
rts
.pend
equal_w .proc
; -- are the two words on the stack identical?
lda P8ESTACK_LO+1,x
cmp P8ESTACK_LO+2,x
bne equal_b._equal_b_false
lda P8ESTACK_HI+1,x
cmp P8ESTACK_HI+2,x
bne equal_b._equal_b_false
beq equal_b._equal_b_true
.pend
notequal_b .proc
; -- are the two bytes on the stack different?
lda P8ESTACK_LO+1,x
cmp P8ESTACK_LO+2,x
beq equal_b._equal_b_false
bne equal_b._equal_b_true
.pend
notequal_w .proc
; -- are the two words on the stack different?
lda P8ESTACK_HI+1,x
cmp P8ESTACK_HI+2,x
beq notequal_b
bne equal_b._equal_b_true
.pend
less_ub .proc
lda P8ESTACK_LO+2,x
cmp P8ESTACK_LO+1,x
bcc equal_b._equal_b_true
bcs equal_b._equal_b_false
.pend
less_b .proc
; see http://www.6502.org/tutorials/compare_beyond.html
lda P8ESTACK_LO+2,x
sec
sbc P8ESTACK_LO+1,x
bvc +
eor #$80
+ bmi equal_b._equal_b_true
bpl equal_b._equal_b_false
.pend
reg_less_uw .proc
; AY < P8ZP_SCRATCH_W2?
cpy P8ZP_SCRATCH_W2+1
bcc _true
bne _false
cmp P8ZP_SCRATCH_W2
bcc _true
_false lda #0
rts
_true lda #1
rts
.pend
less_uw .proc
lda P8ESTACK_HI+2,x
cmp P8ESTACK_HI+1,x
bcc equal_b._equal_b_true
bne equal_b._equal_b_false
lda P8ESTACK_LO+2,x
cmp P8ESTACK_LO+1,x
bcc equal_b._equal_b_true
bcs equal_b._equal_b_false
.pend
reg_less_w .proc
; -- AY < P8ZP_SCRATCH_W2?
cmp P8ZP_SCRATCH_W2
tya
sbc P8ZP_SCRATCH_W2+1
bvc +
eor #$80
+ bmi _true
lda #0
rts
_true lda #1
rts
.pend
less_w .proc
lda P8ESTACK_LO+2,x
cmp P8ESTACK_LO+1,x
lda P8ESTACK_HI+2,x
sbc P8ESTACK_HI+1,x
bvc +
eor #$80
+ bmi equal_b._equal_b_true
bpl equal_b._equal_b_false
.pend
equal_b .proc
; -- are the two bytes on the stack identical?
lda P8ESTACK_LO+2,x
cmp P8ESTACK_LO+1,x
bne _equal_b_false
_equal_b_true lda #1
_equal_b_store inx
sta P8ESTACK_LO+1,x
rts
_equal_b_false lda #0
beq _equal_b_store
.pend
lesseq_ub .proc
lda P8ESTACK_LO+1,x
cmp P8ESTACK_LO+2,x
bcs equal_b._equal_b_true
bcc equal_b._equal_b_false
.pend
lesseq_b .proc
; see http://www.6502.org/tutorials/compare_beyond.html
lda P8ESTACK_LO+2,x
clc
sbc P8ESTACK_LO+1,x
bvc +
eor #$80
+ bmi equal_b._equal_b_true
bpl equal_b._equal_b_false
.pend
reg_lesseq_uw .proc
; AY <= P8ZP_SCRATCH_W2?
cpy P8ZP_SCRATCH_W2+1
beq +
bcc _true
lda #0
rts
+ cmp P8ZP_SCRATCH_W2
bcc _true
beq _true
lda #0
rts
_true lda #1
rts
.pend
lesseq_uw .proc
lda P8ESTACK_HI+1,x
cmp P8ESTACK_HI+2,x
bcc equal_b._equal_b_false
bne equal_b._equal_b_true
lda P8ESTACK_LO+1,x
cmp P8ESTACK_LO+2,x
bcs equal_b._equal_b_true
bcc equal_b._equal_b_false
.pend
reg_lesseq_w .proc
; -- P8ZP_SCRATCH_W2 <= AY ? (note: order different from other routines)
cmp P8ZP_SCRATCH_W2
tya
sbc P8ZP_SCRATCH_W2+1
bvc +
eor #$80
+ bpl +
lda #0
rts
+ lda #1
rts
.pend
lesseq_w .proc
lda P8ESTACK_LO+1,x
cmp P8ESTACK_LO+2,x
lda P8ESTACK_HI+1,x
sbc P8ESTACK_HI+2,x
bvc +
eor #$80
+ bpl equal_b._equal_b_true
bmi equal_b._equal_b_false
.pend
greater_ub .proc
lda P8ESTACK_LO+2,x
cmp P8ESTACK_LO+1,x
beq equal_b._equal_b_false
bcs equal_b._equal_b_true
bcc equal_b._equal_b_false
.pend
greater_b .proc
; see http://www.6502.org/tutorials/compare_beyond.html
lda P8ESTACK_LO+2,x
clc
sbc P8ESTACK_LO+1,x
bvc +
eor #$80
+ bpl equal_b._equal_b_true
bmi equal_b._equal_b_false
.pend
greater_uw .proc
lda P8ESTACK_HI+1,x
cmp P8ESTACK_HI+2,x
bcc equal_b._equal_b_true
bne equal_b._equal_b_false
lda P8ESTACK_LO+1,x
cmp P8ESTACK_LO+2,x
bcc equal_b._equal_b_true
bcs equal_b._equal_b_false
.pend
greater_w .proc
lda P8ESTACK_LO+1,x
cmp P8ESTACK_LO+2,x
lda P8ESTACK_HI+1,x
sbc P8ESTACK_HI+2,x
bvc +
eor #$80
+ bmi equal_b._equal_b_true
bpl equal_b._equal_b_false
.pend
greatereq_ub .proc
lda P8ESTACK_LO+2,x
cmp P8ESTACK_LO+1,x
bcs equal_b._equal_b_true
bcc equal_b._equal_b_false
.pend
greatereq_b .proc
; see http://www.6502.org/tutorials/compare_beyond.html
lda P8ESTACK_LO+2,x
sec
sbc P8ESTACK_LO+1,x
bvc +
eor #$80
+ bpl equal_b._equal_b_true
bmi equal_b._equal_b_false
.pend
greatereq_uw .proc
lda P8ESTACK_HI+2,x
cmp P8ESTACK_HI+1,x
bcc equal_b._equal_b_false
bne equal_b._equal_b_true
lda P8ESTACK_LO+2,x
cmp P8ESTACK_LO+1,x
bcs equal_b._equal_b_true
bcc equal_b._equal_b_false
.pend
greatereq_w .proc
lda P8ESTACK_LO+2,x
cmp P8ESTACK_LO+1,x
lda P8ESTACK_HI+2,x
sbc P8ESTACK_HI+1,x
bvc +
eor #$80
+ bmi equal_b._equal_b_false
bpl equal_b._equal_b_true
.pend
shiftleft_b .proc
inx
ldy P8ESTACK_LO,x
bne +
rts
+ lda P8ESTACK_LO+1,x
- asl a
dey
bne -
sta P8ESTACK_LO+1,x
rts
.pend
shiftright_b .proc
inx
ldy P8ESTACK_LO,x
bne +
rts
+ lda P8ESTACK_LO+1,x
- lsr a
dey
bne -
sta P8ESTACK_LO+1,x
rts
.pend
equalzero_b .proc
lda P8ESTACK_LO+1,x
beq _true
bne _false
_true lda #1
sta P8ESTACK_LO+1,x
rts
_false lda #0
sta P8ESTACK_LO+1,x
rts
.pend
equalzero_w .proc
lda P8ESTACK_LO+1,x
ora P8ESTACK_HI+1,x
beq equalzero_b._true
bne equalzero_b._false
.pend
notequalzero_b .proc
lda P8ESTACK_LO+1,x
beq equalzero_b._false
bne equalzero_b._true
.pend
notequalzero_w .proc
lda P8ESTACK_LO+1,x
ora P8ESTACK_HI+1,x
beq equalzero_b._false
bne equalzero_b._true
.pend
lesszero_b .proc
lda P8ESTACK_LO+1,x
bmi equalzero_b._true
jmp equalzero_b._false
.pend
lesszero_w .proc
lda P8ESTACK_HI+1,x
bmi equalzero_b._true
jmp equalzero_b._false
.pend
greaterzero_ub .proc
lda P8ESTACK_LO+1,x
bne equalzero_b._true
beq equalzero_b._false
.pend
greaterzero_sb .proc
lda P8ESTACK_LO+1,x
beq equalzero_b._false
bpl equalzero_b._true
bmi equalzero_b._false
.pend
greaterzero_uw .proc
lda P8ESTACK_LO+1,x
ora P8ESTACK_HI+1,x
bne equalzero_b._true
beq equalzero_b._false
.pend
greaterzero_sw .proc
lda P8ESTACK_HI+1,x
bmi equalzero_b._false
ora P8ESTACK_LO+1,x
beq equalzero_b._false
bne equalzero_b._true
.pend
lessequalzero_sb .proc
lda P8ESTACK_LO+1,x
bmi equalzero_b._true
beq equalzero_b._true
bne equalzero_b._false
.pend
lessequalzero_sw .proc
lda P8ESTACK_HI+1,x
bmi equalzero_b._true
ora P8ESTACK_LO+1,x
beq equalzero_b._true
bne equalzero_b._false
.pend
greaterequalzero_sb .proc
lda P8ESTACK_LO+1,x
bpl equalzero_b._true
bmi equalzero_b._false
.pend
greaterequalzero_sw .proc
lda P8ESTACK_HI+1,x
bmi equalzero_b._false
ora P8ESTACK_LO+1,x
beq equalzero_b._true
bne equalzero_b._false
.pend
memcopy16_up .proc
; -- copy memory UP from (P8ZP_SCRATCH_W1) to (P8ZP_SCRATCH_W2) of length X/Y (16-bit, X=lo, Y=hi)
; clobbers register A,X,Y
source = P8ZP_SCRATCH_W1
dest = P8ZP_SCRATCH_W2
length = P8ZP_SCRATCH_B1 ; (and SCRATCH_ZPREG)
stx length
sty length+1
ldx length ; move low byte of length into X
bne + ; jump to start if X > 0
dec length ; subtract 1 from length
+ ldy #0 ; set Y to 0
- lda (source),y ; set A to whatever (source) points to offset by Y
sta (dest),y ; move A to location pointed to by (dest) offset by Y
iny ; increment Y
bne + ; if Y<>0 then (rolled over) then still moving bytes
inc source+1 ; increment hi byte of source
inc dest+1 ; increment hi byte of dest
+ dex ; decrement X (lo byte counter)
bne - ; if X<>0 then move another byte
dec length ; we've moved 255 bytes, dec length
bpl - ; if length is still positive go back and move more
rts ; done
.pend
memset .proc
; -- fill memory from (P8ZP_SCRATCH_W1), length XY, with value in A.
; clobbers X, Y
stx P8ZP_SCRATCH_B1
sty _save_reg
ldy #0
ldx _save_reg
beq _lastpage
_fullpage sta (P8ZP_SCRATCH_W1),y
iny
bne _fullpage
inc P8ZP_SCRATCH_W1+1 ; next page
dex
bne _fullpage
_lastpage ldy P8ZP_SCRATCH_B1
beq +
- dey
sta (P8ZP_SCRATCH_W1),y
bne -
+ rts
_save_reg .byte 0
.pend
memsetw .proc
; -- fill memory from (P8ZP_SCRATCH_W1) number of words in P8ZP_SCRATCH_W2, with word value in AY.
; clobbers A, X, Y
sta _mod1+1 ; self-modify
sty _mod1b+1 ; self-modify
sta _mod2+1 ; self-modify
sty _mod2b+1 ; self-modify
ldx P8ZP_SCRATCH_W1
stx P8ZP_SCRATCH_B1
ldx P8ZP_SCRATCH_W1+1
inx
stx P8ZP_SCRATCH_REG ; second page
ldy #0
ldx P8ZP_SCRATCH_W2+1
beq _lastpage
_fullpage
_mod1 lda #0 ; self-modified
sta (P8ZP_SCRATCH_W1),y ; first page
sta (P8ZP_SCRATCH_B1),y ; second page
iny
_mod1b lda #0 ; self-modified
sta (P8ZP_SCRATCH_W1),y ; first page
sta (P8ZP_SCRATCH_B1),y ; second page
iny
bne _fullpage
inc P8ZP_SCRATCH_W1+1 ; next page pair
inc P8ZP_SCRATCH_W1+1 ; next page pair
inc P8ZP_SCRATCH_B1+1 ; next page pair
inc P8ZP_SCRATCH_B1+1 ; next page pair
dex
bne _fullpage
_lastpage ldx P8ZP_SCRATCH_W2
beq _done
ldy #0
-
_mod2 lda #0 ; self-modified
sta (P8ZP_SCRATCH_W1), y
inc P8ZP_SCRATCH_W1
bne _mod2b
inc P8ZP_SCRATCH_W1+1
_mod2b lda #0 ; self-modified
sta (P8ZP_SCRATCH_W1), y
inc P8ZP_SCRATCH_W1
bne +
inc P8ZP_SCRATCH_W1+1
+ dex
bne -
_done rts
.pend
ror2_mem_ub .proc
; -- in-place 8-bit ror of byte at memory location in AY
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
lda (P8ZP_SCRATCH_W1),y
lsr a
bcc +
ora #$80
+ sta (P8ZP_SCRATCH_W1),y
rts
.pend
rol2_mem_ub .proc
; -- in-place 8-bit rol of byte at memory location in AY
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
lda (P8ZP_SCRATCH_W1),y
cmp #$80
rol a
sta (P8ZP_SCRATCH_W1),y
rts
.pend
rol_array_ub .proc
; -- rol a ubyte in an array
lda _arg_target
ldy _arg_target+1
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy _arg_index
lda (P8ZP_SCRATCH_W1),y
rol a
sta (P8ZP_SCRATCH_W1),y
rts
_arg_target .word 0
_arg_index .byte 0
.pend
ror_array_ub .proc
; -- ror a ubyte in an array
lda _arg_target
ldy _arg_target+1
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy _arg_index
lda (P8ZP_SCRATCH_W1),y
ror a
sta (P8ZP_SCRATCH_W1),y
rts
_arg_target .word 0
_arg_index .byte 0
.pend
ror2_array_ub .proc
; -- ror2 (8-bit ror) a ubyte in an array
lda _arg_target
ldy _arg_target+1
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy _arg_index
lda (P8ZP_SCRATCH_W1),y
lsr a
bcc +
ora #$80
+ sta (P8ZP_SCRATCH_W1),y
rts
_arg_target .word 0
_arg_index .byte 0
.pend
rol2_array_ub .proc
; -- rol2 (8-bit rol) a ubyte in an array
lda _arg_target
ldy _arg_target+1
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy _arg_index
lda (P8ZP_SCRATCH_W1),y
cmp #$80
rol a
sta (P8ZP_SCRATCH_W1),y
rts
_arg_target .word 0
_arg_index .byte 0
.pend
ror_array_uw .proc
; -- ror a uword in an array
php
lda _arg_target
ldy _arg_target+1
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
lda _arg_index
asl a
tay
iny
lda (P8ZP_SCRATCH_W1),y
plp
ror a
sta (P8ZP_SCRATCH_W1),y
dey
lda (P8ZP_SCRATCH_W1),y
ror a
sta (P8ZP_SCRATCH_W1),y
rts
_arg_target .word 0
_arg_index .byte 0
.pend
rol_array_uw .proc
; -- rol a uword in an array
php
lda _arg_target
ldy _arg_target+1
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
lda _arg_index
asl a
tay
lda (P8ZP_SCRATCH_W1),y
plp
rol a
sta (P8ZP_SCRATCH_W1),y
iny
lda (P8ZP_SCRATCH_W1),y
rol a
sta (P8ZP_SCRATCH_W1),y
rts
_arg_target .word 0
_arg_index .byte 0
.pend
rol2_array_uw .proc
; -- rol2 (16-bit rol) a uword in an array
lda _arg_target
ldy _arg_target+1
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
lda _arg_index
asl a
tay
lda (P8ZP_SCRATCH_W1),y
asl a
sta (P8ZP_SCRATCH_W1),y
iny
lda (P8ZP_SCRATCH_W1),y
rol a
sta (P8ZP_SCRATCH_W1),y
bcc +
dey
lda (P8ZP_SCRATCH_W1),y
adc #0
sta (P8ZP_SCRATCH_W1),y
+ rts
_arg_target .word 0
_arg_index .byte 0
.pend
ror2_array_uw .proc
; -- ror2 (16-bit ror) a uword in an array
lda _arg_target
ldy _arg_target+1
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
lda _arg_index
asl a
tay
iny
lda (P8ZP_SCRATCH_W1),y
lsr a
sta (P8ZP_SCRATCH_W1),y
dey
lda (P8ZP_SCRATCH_W1),y
ror a
sta (P8ZP_SCRATCH_W1),y
bcc +
iny
lda (P8ZP_SCRATCH_W1),y
ora #$80
sta (P8ZP_SCRATCH_W1),y
+ rts
_arg_target .word 0
_arg_index .byte 0
.pend
strcpy .proc
; copy a string (must be 0-terminated) from A/Y to (P8ZP_SCRATCH_W1)
; it is assumed the target string is large enough.
; returns the length of the string that was copied in Y.
sta P8ZP_SCRATCH_W2
sty P8ZP_SCRATCH_W2+1
ldy #$ff
- iny
lda (P8ZP_SCRATCH_W2),y
sta (P8ZP_SCRATCH_W1),y
bne -
rts
.pend
strcmp_expression .proc
; -- compare strings, result in A
lda _arg_s2
ldy _arg_s2+1
sta P8ZP_SCRATCH_W2
sty P8ZP_SCRATCH_W2+1
lda _arg_s1
ldy _arg_s1+1
jmp strcmp_mem
_arg_s1 .word 0
_arg_s2 .word 0
.pend
strcmp_mem .proc
; -- compares strings in s1 (AY) and s2 (P8ZP_SCRATCH_W2).
; Returns -1,0,1 in A, depeding on the ordering. Clobbers Y.
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
_loop lda (P8ZP_SCRATCH_W1),y
bne +
lda (P8ZP_SCRATCH_W2),y
bne _return_minusone
beq _return
+ cmp (P8ZP_SCRATCH_W2),y
bcc _return_minusone
bne _return_one
inc P8ZP_SCRATCH_W1
bne +
inc P8ZP_SCRATCH_W1+1
+ inc P8ZP_SCRATCH_W2
bne _loop
inc P8ZP_SCRATCH_W2+1
bne _loop
_return_one
lda #1
_return rts
_return_minusone
lda #-1
rts
.pend
sign_extend_stack_byte .proc
; -- sign extend the (signed) byte on the stack to full 16 bits
lda P8ESTACK_LO+1,x
ora #$7f
bmi +
lda #0
+ sta P8ESTACK_HI+1,x
rts
.pend
strlen .proc
; -- returns the number of bytes in the string in AY, in Y.
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
- lda (P8ZP_SCRATCH_W1),y
beq +
iny
bne -
+ rts
.pend
containment_bytearray .proc
; -- check if a value exists in a byte array.
; parameters: P8ZP_SCRATCH_W1: address of the byte array, A = byte to check, Y = length of array (>=1).
; returns boolean 0/1 in A.
dey
- cmp (P8ZP_SCRATCH_W1),y
beq +
dey
cpy #255
bne -
lda #0
rts
+ lda #1
rts
.pend
containment_wordarray .proc
; -- check if a value exists in a word array.
; parameters: P8ZP_SCRATCH_W1: value to check, P8ZP_SCRATCH_W2: address of the word array, Y = length of array (>=1).
; returns boolean 0/1 in A.
dey
tya
asl a
tay
- lda P8ZP_SCRATCH_W1
cmp (P8ZP_SCRATCH_W2),y
bne +
lda P8ZP_SCRATCH_W1+1
iny
cmp (P8ZP_SCRATCH_W2),y
beq _found
+ dey
dey
cpy #254
bne -
lda #0
rts
_found lda #1
rts
.pend
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