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92 lines
2.2 KiB
ArmAsm
92 lines
2.2 KiB
ArmAsm
;
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; Maciej 'YTM/Elysium' Witkowiak
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;
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; 27.10.2001
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; 06.03.2002
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; 25.07.2005
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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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; TODO:
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; TAB (should be implemented)
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; other special characters directly from keyboard are unsafe, though some might be
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; implemented:
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; HOME, UPLINE, ULINEON, ULINEOFF, REV_ON, REV_OFF, BOLDON, ITALICON, OUTLINEON, PLAINTEXT
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; and cursor movement, maybe stuff like INSERT too
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;
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; these must be ignored:
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; ESC_GRAPHICS, ESC_RULER, GOTOX, GOTOY, GOTOXY, NEWCARDSET, all 1..8
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;
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; note that there are conflicts between control characters and keyboard:
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; HOME = KEY_ENTER, KEY_HOME = REV_ON,
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; UPLINE = ?, KEY_UPARROW = GOTOY, ...
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.export _cputcxy, _cputc
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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 "const.inc"
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.include "geossym.inc"
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.include "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 0-31 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 #KEY_DELETE
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bne L0
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ldx #BACKSPACE
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sec
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bcs L2
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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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clc
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adc #6 ; 6 pixels down to the baseline
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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 fix_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 fix_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 fix_cursor
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dec cursor_r ; yes - stay in the last line
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fix_cursor:
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jmp fixcursor
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do_cr: lda #0
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sta cursor_c
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beq fix_cursor
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