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libsrc/plus4/cgetc.s

@@ -0,0 +1,48 @@
+;
+; Ullrich von Bassewitz, 06.08.1998
+;
+; char cgetc (void);
+;
+
+       	.export		_cgetc
+       	.import		cursor
+
+       	.include	"plus4.inc"
+
+
+_cgetc:	lda	KEY_COUNT 	; Get number of characters
+       	ora	FKEY_COUNT	; Or with number of function key chars
+       	bne	L2	  	; Jump if there are already chars waiting
+
+; Switch on the cursor if needed
+
+       	ldy	CURS_X
+       	lda	(CRAM_PTR),y	; Get current char
+       	pha		  	; And save it
+       	lda	CHARCOLOR
+       	sta	(CRAM_PTR),y
+
+       	lda	cursor
+       	beq	L1	    	; Jump if no cursor
+       	tya
+       	clc
+       	adc	SCREEN_PTR
+       	sta	TED_CURSLO
+       	lda	SCREEN_PTR+1
+       	adc	#$00
+       	sbc	#$0B	  	; + carry = $C00 (screen address)
+       	sta	TED_CURSHI
+
+L1:    	lda	KEY_COUNT
+       	ora	FKEY_COUNT
+       	beq	L1
+       	pla
+       	sta	(CRAM_PTR),y
+       	lda	#$ff
+       	sta	TED_CURSLO	; Cursor off
+       	sta	TED_CURSHI
+
+L2:    	jsr    	KBDREAD	       	; Read char and return in A
+       	ldx	#0
+       	rts
+