mirror of https://gitlab.com/camelot/kickc.git
96 lines
1.9 KiB
NASM
96 lines
1.9 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="struct-ptr-26.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 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 file = $4000
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.label uSize = 4
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// file->bufEdit = (BYTE*)4
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lda #<4
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sta file
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lda #>4
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sta file+1
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// uSize = *ptrw
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ldy #$1e
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lda file
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sta.z $fe
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lda file+1
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sta.z $ff
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lda ($fe),y
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sta.z uSize
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iny
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lda ($fe),y
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sta.z uSize+1
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// print_uint(uSize)
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jsr print_uint
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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(4) unsigned int w)
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print_uint: {
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.label w = 4
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// print_uchar(BYTE1(w))
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ldx.z w+1
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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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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 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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// 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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.segment Data
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print_hextab: .text "0123456789abcdef"
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