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git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/common/strchr.s

@@ -0,0 +1,41 @@
+;
+; Ullrich von Bassewitz, 31.05.1998
+;
+; const char* strchr (const char* s, int c);
+;
+
+	.export		_strchr
+	.import		popax
+	.importzp	ptr1, tmp1
+
+_strchr:
+       	sta	tmp1		; Save c
+       	jsr	popax 		; get s
+       	sta	ptr1
+       	stx	ptr1+1
+       	ldy	#0
+
+scloop:	lda	(ptr1),y	; get next char
+       	beq	strz  		; jump if end of string
+       	cmp	tmp1  		; found?
+       	beq	strf  		; jump if yes
+       	iny
+       	bne	scloop
+       	inc	ptr1+1
+       	bne	scloop		; jump always
+
+; found, calculate pointer to c
+
+strf:  	ldx	ptr1+1		; get high byte of pointer
+       	tya			; low byte offset
+       	clc
+       	adc	ptr1
+       	bcc	str1
+       	inx
+str1:  	rts
+
+; not found, return zero
+
+strz:	tax			; return 0
+	rts
+