mirror of https://gitlab.com/camelot/kickc.git
290 lines
5.0 KiB
NASM
290 lines
5.0 KiB
NASM
/// @file
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/// A lightweight library for printing on the C64.
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///
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/// Printing with this library is done by calling print_ function for each element
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// Commodore 64 PRG executable file
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.file [name="linkedlist-kc.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(__start)
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.const OFFSET_STRUCT_NODE_VALUE = 2
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.label print_screen = $400
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.label last_time = $e
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.label print_line_cursor = $a
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.label Ticks = 4
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.label Ticks_1 = $c
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.label print_char_cursor = 8
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.label free_ = 6
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.label root = 2
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.segment Code
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__start: {
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// unsigned int last_time
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lda #<0
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sta.z last_time
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sta.z last_time+1
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jsr main
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rts
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}
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main: {
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.label __5 = 6
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.label i = $a
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// start()
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jsr start
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ldx #0
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lda #<print_screen
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sta.z print_char_cursor
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lda #>print_screen
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sta.z print_char_cursor+1
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__b1:
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lda #<0
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sta.z root
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sta.z root+1
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sta.z free_
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sta.z free_+1
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sta.z i
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sta.z i+1
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__b2:
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// prepend(i)
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jsr prepend
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// for(unsigned int i : 0..2999)
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inc.z i
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bne !+
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inc.z i+1
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!:
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lda.z i+1
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cmp #>$bb8
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bne __b2
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lda.z i
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cmp #<$bb8
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bne __b2
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// sum()
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jsr sum
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// print_char((byte)sum())
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lda.z __5
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jsr print_char
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// for(unsigned char c : 0..4)
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inx
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cpx #5
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bne __b1
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// end()
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jsr end
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// }
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rts
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}
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start: {
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.label LAST_TIME = last_time
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// asm
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jsr $ffde
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sta LAST_TIME
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stx LAST_TIME+1
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// }
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rts
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}
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// void prepend(__zp($a) unsigned int x)
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prepend: {
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.label new = 4
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.label x = $a
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// alloc()
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jsr alloc
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// new = alloc()
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// new->next = root
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ldy #0
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lda.z root
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sta (new),y
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iny
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lda.z root+1
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sta (new),y
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// new->value = x
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ldy #OFFSET_STRUCT_NODE_VALUE
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lda.z x
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sta (new),y
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iny
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lda.z x+1
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sta (new),y
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// root = new
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lda.z new
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sta.z root
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lda.z new+1
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sta.z root+1
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// }
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rts
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}
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sum: {
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.label current = 2
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.label s = 6
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.label return = 6
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// current = root
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lda #<0
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sta.z s
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sta.z s+1
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__b1:
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// while (current)
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lda.z current+1
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cmp #>0
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bne __b2
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lda.z current
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cmp #<0
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bne __b2
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// }
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rts
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__b2:
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// s += current->value
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ldy #OFFSET_STRUCT_NODE_VALUE
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clc
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lda.z s
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adc (current),y
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sta.z s
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iny
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lda.z s+1
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adc (current),y
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sta.z s+1
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// current = current->next
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ldy #0
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lda (current),y
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pha
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iny
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lda (current),y
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sta.z current+1
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pla
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sta.z current
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jmp __b1
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}
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// Print a single char
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// void print_char(__register(A) char ch)
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print_char: {
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// *(print_char_cursor++) = ch
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ldy #0
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sta (print_char_cursor),y
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// *(print_char_cursor++) = ch;
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inc.z print_char_cursor
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bne !+
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inc.z print_char_cursor+1
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!:
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// }
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rts
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}
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end: {
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// Ticks = last_time
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lda.z last_time
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sta.z Ticks
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lda.z last_time+1
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sta.z Ticks+1
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// start()
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jsr start
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// last_time -= Ticks
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lda.z last_time
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sec
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sbc.z Ticks
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sta.z last_time
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lda.z last_time+1
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sbc.z Ticks+1
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sta.z last_time+1
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// Ticks = last_time
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lda.z last_time
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sta.z Ticks_1
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lda.z last_time+1
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sta.z Ticks_1+1
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// print_uint(Ticks)
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jsr print_uint
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// print_ln()
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jsr print_ln
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// }
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rts
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}
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alloc: {
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.label __1 = 4
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.label return = 4
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// heap + free_
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lda.z free_
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asl
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sta.z __1
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lda.z free_+1
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rol
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sta.z __1+1
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asl.z __1
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rol.z __1+1
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lda.z return
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clc
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adc #<heap
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sta.z return
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lda.z return+1
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adc #>heap
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sta.z return+1
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// free_++;
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inc.z free_
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bne !+
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inc.z free_+1
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!:
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// }
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rts
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}
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// Print a unsigned int as HEX
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// void print_uint(__zp($c) unsigned int w)
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print_uint: {
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.label w = $c
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// print_uchar(BYTE1(w))
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ldx.z w+1
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jsr print_uchar
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// print_uchar(BYTE0(w))
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ldx.z w
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jsr print_uchar
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// }
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rts
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}
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// Print a newline
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print_ln: {
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lda #<print_screen
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sta.z print_line_cursor
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lda #>print_screen
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sta.z print_line_cursor+1
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__b1:
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// print_line_cursor + 0x28
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lda #$28
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clc
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adc.z print_line_cursor
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sta.z print_line_cursor
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bcc !+
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inc.z print_line_cursor+1
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!:
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// while (print_line_cursor<print_char_cursor)
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lda.z print_line_cursor+1
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cmp.z print_char_cursor+1
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bcc __b1
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bne !+
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lda.z print_line_cursor
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cmp.z print_char_cursor
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bcc __b1
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!:
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// }
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rts
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}
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// Print a char as HEX
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// void print_uchar(__register(X) char b)
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print_uchar: {
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// b>>4
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txa
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lsr
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lsr
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lsr
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lsr
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// print_char(print_hextab[b>>4])
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tay
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lda print_hextab,y
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// Table of hexadecimal digits
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jsr print_char
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// b&0xf
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lda #$f
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axs #0
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// print_char(print_hextab[b&0xf])
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lda print_hextab,x
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jsr print_char
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// }
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rts
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}
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.segment Data
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print_hextab: .text "0123456789abcdef"
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heap: .fill 4*$fa0, 0
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