mirror of https://gitlab.com/camelot/kickc.git
248 lines
4.2 KiB
NASM
248 lines
4.2 KiB
NASM
/// @file
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/// C standard library string.h
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///
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/// Functions to manipulate C strings and arrays.
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/// NULL pointer
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// Commodore 64 PRG executable file
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.file [name="sieve-min.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 COUNT = $4000
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/* Up to what number? */
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.const SQRT_COUNT = $80
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.label SCREEN = $400
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/* Sqrt of COUNT */
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.label sieve = $1000
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.label print_screen = $400
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.label print_char_cursor = 2
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.segment Code
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main: {
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.label i = 2
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.label sieve_i = $c
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.label j = 6
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.label s = 8
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.label i_1 = $a
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.label __16 = 4
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// memset(sieve, 0, COUNT)
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// Fill sieve with zeros
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jsr memset
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lda #<sieve+2
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sta.z sieve_i
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lda #>sieve+2
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sta.z sieve_i+1
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lda #<2
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sta.z i
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lda #>2
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sta.z i+1
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__b1:
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// while (i < SQRT_COUNT)
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lda.z i+1
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bne !+
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lda.z i
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cmp #SQRT_COUNT
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bcc __b2
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!:
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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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lda #<2
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sta.z i_1
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lda #>2
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sta.z i_1+1
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__b7:
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// for (i = 2; i < 0x04c7; ++i)
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lda.z i_1+1
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cmp #>$4c7
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bcc __b8
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bne !+
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lda.z i_1
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cmp #<$4c7
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bcc __b8
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!:
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__b11:
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// (*(SCREEN+999))++;
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inc SCREEN+$3e7
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jmp __b11
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__b8:
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// if (!sieve[i])
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lda.z i_1
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clc
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adc #<sieve
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sta.z __16
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lda.z i_1+1
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adc #>sieve
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sta.z __16+1
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ldy #0
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lda (__16),y
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cmp #0
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bne __b9
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// print_uint(i)
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jsr print_uint
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// print_char(' ')
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lda #' '
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jsr print_char
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__b9:
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// for (i = 2; i < 0x04c7; ++i)
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inc.z i_1
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bne !+
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inc.z i_1+1
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!:
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jmp __b7
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__b2:
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// if (!*sieve_i)
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ldy #0
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lda (sieve_i),y
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cmp #0
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bne __b3
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// unsigned int j = i*2
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/* Prime number - mark all multiples */
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lda.z i
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asl
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sta.z j
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lda.z i+1
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rol
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sta.z j+1
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// unsigned char* s = &sieve[j]
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lda.z j
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clc
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adc #<sieve
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sta.z s
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lda.z j+1
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adc #>sieve
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sta.z s+1
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__b4:
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// while (j < COUNT)
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lda.z j+1
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cmp #>COUNT
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bcc __b5
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bne !+
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lda.z j
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cmp #<COUNT
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bcc __b5
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!:
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__b3:
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// i++;
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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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// sieve_i++;
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inc.z sieve_i
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bne !+
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inc.z sieve_i+1
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!:
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jmp __b1
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__b5:
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// *s = 1
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lda #1
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ldy #0
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sta (s),y
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// s += i
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clc
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lda.z s
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adc.z i
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sta.z s
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lda.z s+1
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adc.z i+1
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sta.z s+1
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// j += i
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clc
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lda.z j
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adc.z i
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sta.z j
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lda.z j+1
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adc.z i+1
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sta.z j+1
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jmp __b4
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}
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// Copies the character c (an unsigned char) to the first num characters of the object pointed to by the argument str.
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// void * memset(void *str, char c, unsigned int num)
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memset: {
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.const c = 0
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.label str = sieve
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.label end = str+COUNT
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.label dst = 4
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lda #<str
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sta.z dst
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lda #>str
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sta.z dst+1
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__b1:
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// for(char* dst = str; dst!=end; dst++)
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lda.z dst+1
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cmp #>end
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bne __b2
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lda.z dst
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cmp #<end
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bne __b2
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// }
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rts
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__b2:
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// *dst = c
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lda #c
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ldy #0
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sta (dst),y
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// for(char* dst = str; dst!=end; dst++)
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inc.z dst
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bne !+
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inc.z dst+1
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!:
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jmp __b1
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}
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// Print a unsigned int as HEX
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// void print_uint(__zp($a) unsigned int w)
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print_uint: {
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.label w = $a
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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 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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// 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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