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54 lines
1.0 KiB
NASM
54 lines
1.0 KiB
NASM
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// Commodore 64 PRG executable file
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.file [name="struct-pointer-typing.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=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(main)
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.const SIZEOF_STRUCT_BLOCK = 6
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.const OFFSET_STRUCT_BLOCK_PREV = 4
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.const OFFSET_STRUCT_BLOCK_NEXT = 2
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.segment Code
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main: {
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.label ptr = 2
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lda #<blocks
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sta.z ptr
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lda #>blocks
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sta.z ptr+1
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ldx #0
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__b1:
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// for(char i=0;i<10;i++)
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cpx #$a
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bcc __b2
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// }
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rts
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__b2:
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// ptr2->next = ptr->next
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ldy #OFFSET_STRUCT_BLOCK_PREV
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lda (ptr),y
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sta.z $fe
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iny
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lda (ptr),y
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sta.z $ff
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ldy #OFFSET_STRUCT_BLOCK_NEXT
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lda (ptr),y
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sta ($fe),y
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iny
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lda (ptr),y
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sta ($fe),y
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// ptr++;
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lda #SIZEOF_STRUCT_BLOCK
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clc
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adc.z ptr
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sta.z ptr
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bcc !+
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inc.z ptr+1
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!:
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// for(char i=0;i<10;i++)
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inx
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jmp __b1
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}
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.segment Data
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blocks: .fill 6*$a, 0
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