mirror of https://gitlab.com/camelot/kickc.git
129 lines
2.6 KiB
NASM
129 lines
2.6 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="printmsg.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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.label print_line_cursor = 6
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.segment Code
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main: {
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// print_str(msg)
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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 #<msg
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sta.z print_str.str
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lda #>msg
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sta.z print_str.str+1
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jsr print_str
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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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jsr print_ln
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lda.z print_line_cursor
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sta.z print_char_cursor
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lda.z print_line_cursor+1
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sta.z print_char_cursor+1
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// print_str(msg2)
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lda #<msg2
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sta.z print_str.str
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lda #>msg2
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sta.z print_str.str+1
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jsr print_str
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// print_ln()
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jsr print_ln
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lda.z print_line_cursor
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sta.z print_char_cursor
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lda.z print_line_cursor+1
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sta.z print_char_cursor+1
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// print_str(msg3)
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lda #<msg3
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sta.z print_str.str
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lda #>msg3
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sta.z print_str.str+1
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jsr print_str
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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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// Print a zero-terminated string
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// void print_str(__zp(4) char *str)
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print_str: {
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.label str = 4
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__b1:
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// while(*str)
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ldy #0
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lda (str),y
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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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// print_char(*(str++))
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ldy #0
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lda (str),y
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jsr print_char
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// print_char(*(str++));
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inc.z str
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bne !+
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inc.z str+1
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!:
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jmp __b1
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}
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// Print a newline
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print_ln: {
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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 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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msg: .text "hello world! "
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.byte 0
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msg2: .text "hello c64! "
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.byte 0
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msg3: .text "hello 2017! "
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.byte 0
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