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103 lines
1.5 KiB
ArmAsm
103 lines
1.5 KiB
ArmAsm
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; Maciej 'YTM/Elysium' Witkowiak
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; 27.10.2001
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; 06.03.2002
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; void cputcxy (unsigned char x, unsigned char y, char c);
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; void cputc (char c);
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.export _cputcxy, _cputc, update_cursor
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.import _gotoxy, fixcursor
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.import popa
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.import xsize,ysize
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.importzp cursor_x, cursor_y, cursor_c, cursor_r
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.include "../inc/const.inc"
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.include "../inc/geossym.inc"
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.include "../inc/jumptab.inc"
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_cputcxy:
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pha ; Save C
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jsr popa ; Get Y
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jsr _gotoxy ; Set cursor, drop x
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pla ; Restore C
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; Plot a character - also used as internal function
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_cputc:
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tax ; save character
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; some characters are not safe for PutChar
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cmp #$20
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bcs L1
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cmp #CR
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beq do_cr
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cmp #LF
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beq do_lf
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cmp #$1d
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bne L00
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ldx #BACKSPACE
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sec
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bcs L2
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L00: cmp #ESC_GRAPHICS
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beq L0
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cmp #ESC_RULER
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beq L0
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cmp #GOTOX
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beq L0
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cmp #GOTOY
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beq L0
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cmp #GOTOXY
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beq L0
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cmp #NEWCARDSET
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beq L0
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cmp #$1e
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bne L1
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L0: rts
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L1: clc
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L2: php
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lda cursor_x
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sta r11L
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lda cursor_x+1
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sta r11H
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lda cursor_y
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sta r1H
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txa
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jsr PutChar
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plp
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bcs update_cursor
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inc cursor_c
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lda cursor_c
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cmp xsize ; hit right margin?
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bne update_cursor
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lda #0 ; yes - do cr+lf
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sta cursor_c
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do_lf: inc cursor_r
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lda cursor_r
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cmp ysize ; hit bottom margin?
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bne update_cursor
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dec cursor_r ; yes - stay in the last line
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update_cursor:
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jsr fixcursor
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lda cursor_x
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sta r4L
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lda cursor_x+1
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sta r4H
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lda cursor_y
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sec
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sbc curHeight
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sta r5L
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lda #1 ; update cursor prompt position
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sta r3L
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jmp PosSprite
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do_cr: lda #0
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sta cursor_c
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beq update_cursor
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