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121 lines
2.0 KiB
NASM
121 lines
2.0 KiB
NASM
// Tests of strip() function from https://news.ycombinator.com/item?id=12080871
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// Commodore 64 PRG executable file
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.file [name="strip.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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.label screen = 6
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.segment Code
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main: {
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// strip(msg1, ' ')
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ldx #' '
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lda #<msg1
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sta.z strip.dest
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lda #>msg1
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sta.z strip.dest+1
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jsr strip
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// print(msg1)
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lda #<$400
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sta.z screen
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lda #>$400
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sta.z screen+1
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lda #<msg1
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sta.z print.msg
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lda #>msg1
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sta.z print.msg+1
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jsr print
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// strip(msg2, 'y')
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ldx #'y'
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lda #<msg2
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sta.z strip.dest
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lda #>msg2
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sta.z strip.dest+1
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jsr strip
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// print(msg2)
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lda #<msg2
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sta.z print.msg
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lda #>msg2
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sta.z print.msg+1
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jsr print
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// }
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rts
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}
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// strip(byte* zp(8) p, byte register(X) c)
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strip: {
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.label dest = 2
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.label p = 8
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.label p_1 = 4
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lda.z dest
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sta.z p_1
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lda.z dest+1
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sta.z p_1+1
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__b1:
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// if(*p!=c)
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txa
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ldy #0
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cmp (p_1),y
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beq __b2
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// *dest++=*p
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lda (p_1),y
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sta (dest),y
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// *dest++=*p;
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inc.z dest
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bne !+
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inc.z dest+1
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!:
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__b2:
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// while(*p++!=0)
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clc
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lda.z p_1
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adc #1
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sta.z p
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lda.z p_1+1
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adc #0
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sta.z p+1
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ldy #0
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lda (p_1),y
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cmp #0
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bne __b4
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// }
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rts
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__b4:
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lda.z p
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sta.z p_1
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lda.z p+1
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sta.z p_1+1
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jmp __b1
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}
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// print(byte* zp(4) msg)
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print: {
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.label msg = 4
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__b1:
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// *screen++ = *msg++
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ldy #0
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lda (msg),y
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sta (screen),y
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// *screen++ = *msg++;
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inc.z screen
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bne !+
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inc.z screen+1
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!:
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inc.z msg
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bne !+
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inc.z msg+1
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!:
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// while(*msg!=0)
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ldy #0
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lda (msg),y
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cmp #0
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bne __b1
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// }
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rts
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}
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.segment Data
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msg1: .text "hello world!"
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.byte 0
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msg2: .text "goodbye blue sky!"
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.byte 0
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