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libsrc/common/_fdesc.s

@@ -0,0 +1,39 @@
+;
+; Ullrich von Bassewitz, 17.06.1998
+;
+; int _fdesc (void);
+; /* Find a free descriptor slot */
+
+
+       	.export		__fdesc
+	.import		return0, __filetab
+	.importzp	tmp1
+
+__fdesc:
+	ldy	#0
+L1:	lda	__filetab+1,y	; load flags
+	beq    	L2		; jump if empty (== CLOSED)
+	iny
+	iny
+	cpy	#16		; Done?
+	bne	L1
+
+; File table is full
+
+	jmp	return0
+
+; Free slot found
+
+L2:    	sty	tmp1		; Offset
+	lda	#<__filetab
+	ldx	#>__filetab
+	clc
+	adc	tmp1
+	tay
+	txa
+	adc	#0
+	tax
+	tya
+	rts
+
+