New module

git-svn-id: svn://svn.cc65.org/cc65/trunk@1602 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/runtime/Makefile

@@ -13,6 +13,7 @@
 OBJS = 	add.o		\
        	addeqsp.o	\
 	addysp.o	\
+        along.o         \
        	and.o		\
        	aslax1.o	\
        	aslax2.o	\

libsrc/runtime/along.s

@@ -0,0 +1,24 @@
+;
+; Ullrich von Bassewitz, 23.11.2002
+;
+; CC65 runtime: Convert char in ax into a long
+;
+
+       	.export		aulong, along
+	.importzp	sreg
+
+; Convert A from char to long in EAX
+
+aulong: ldx	#0
+	stx	sreg
+	stx	sreg+1
+       	rts
+
+along: 	cmp    	#$80  		; Positive?
+	bcc    	aulong		; Yes, handle like unsigned type
+	ldx    	#$ff
+	stx	sreg
+	stx	sreg+1
+	rts
+
+