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libsrc/common/strrchr.s

@@ -0,0 +1,47 @@
+;
+; Ullrich von Bassewitz, 31.05.1998
+;
+; char* strrchr (const char* s, int c);
+;
+
+     	.export		_strrchr
+	.import		popax
+	.importzp	ptr1, ptr2, tmp1
+
+_strrchr:
+       	sta	tmp1		; Save c
+       	jsr	popax 		; get s
+       	sta	ptr1
+       	stx	ptr1+1
+	lda	#0		; function result = NULL
+	sta	ptr2
+	sta	ptr2+1
+       	tay
+
+L1:	lda	(ptr1),y	; get next char
+       	beq    	L3  		; jump if end of string
+       	cmp	tmp1  		; found?
+       	bne    	L2  		; jump if no
+
+; Remember a pointer to the character
+
+	tya
+	clc
+	adc	ptr1
+	sta	ptr2
+	lda	ptr1+1
+	adc	#$00
+	sta	ptr2+1
+
+; Next char
+
+L2:	iny
+       	bne	L1
+       	inc	ptr1+1
+       	bne    	L1		; jump always
+
+; Return the pointer to the last occurrence
+
+L3:	lda	ptr2
+	ldx	ptr2+1
+	rts