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libsrc/common/memcmp.s

@@ -0,0 +1,54 @@
+;
+; Ullrich von Bassewitz, 09.06.1998
+;
+; int memcmp (const void* p1, const void* p2, size_t count);
+;
+
+	.export		_memcmp
+	.import		popax, return0
+	.importzp	ptr1, ptr2, ptr3
+
+_memcmp:
+    	sta	ptr3		; Save count
+    	sta	ptr3+1
+       	jsr	popax 	  	; get p2
+    	sta	ptr2
+    	stx	ptr2+1
+    	jsr	popax 		; get p1
+    	sta	ptr1
+    	stx	ptr1+1
+
+    	ldy	#0
+    	ldx	ptr3		; use X as low counter byte
+    	beq	L3
+
+L1: 	lda	(ptr1),y
+    	cmp	(ptr2),y
+    	bne    	L5
+    	iny
+    	bne	L2
+    	inc	ptr1+1
+    	inc	ptr2+1
+L2:    	txa
+  	beq	L3
+	dex
+	jmp	L1
+L3:	lda	ptr3+1		; check high byte
+	beq	L4
+	dec	ptr3+1
+	dex			; X = $FF
+	bne	L1		; branch always
+
+; Memory areas are equal
+
+L4:	jmp	return0
+
+; Not equal, check which one is greater
+
+L5:	bcs	L6
+  	ldx	#$FF
+  	rts
+
+L6:	ldx	#$01
+	rts
+