Splitted the atexit module. Minor cleanup in doatexit.

git-svn-id: svn://svn.cc65.org/cc65/trunk@395 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/common/Makefile

@@ -33,6 +33,7 @@ S_OBJS =	_fdesc.o	\
 		atexit.o	\
 		atoi.o		\
 		copydata.o	\
+		doatexit.o	\
 		errno.o		\
 		fmisc.o 	\
 		free.o		\
@@ -94,3 +95,4 @@ clean:
 	@rm -f $(C_OBJS:.o=.s)
 	@rm -f $(C_OBJS)
 	@rm -f $(S_OBJS)
+				 

libsrc/common/atexit.s

@@ -4,34 +4,28 @@
 ; int atexit (void (*f) (void));
 ;
 
-; The exit functions
-
-      	.export		_atexit, doatexit
-	.import		__errno, jmpvec
+      	.export		_atexit
+	.import		exitfunc_table, exitfunc_index
+	.importzp	exitfunc_max
+	.import		__errno
 
 	.include	"errno.inc"
 
-.bss
-ecount:	.byte	0		; Really an index, inc'ed by 2
-efunc: 	.word  	0,0,0,0,0	; 5 exit functions
-maxcount = * - efunc
 
+.proc	_atexit
 
-.code
-
-_atexit:
-	ldy	ecount
-	cpy	#maxcount	; slot available?
-	beq	E0		; jump if no
+	ldy	exitfunc_index
+       	cpy    	#exitfunc_max		; Slot available?
+       	beq    	@Error			; Jump if no
 
 ; Enter the function into the table
 
-	sta	efunc,y
+	sta	exitfunc_table,y
 	iny
 	txa
-	sta	efunc,y
+	sta	exitfunc_table,y
 	iny
-	sty	ecount
+	sty	exitfunc_index
 
 ; Done, return zero
 
@@ -41,32 +35,15 @@ _atexit:
 
 ; Error, no space left
 
-E0:	lda	#ENOSPC		; No space left
+@Error:	lda	#ENOSPC	      	; No space left
       	sta	__errno
       	ldx	#$00
       	stx	__errno+1
-	dex
+      	dex			; Make return value -1
       	txa
       	rts
 
-; Function called from exit
-
-doatexit:
-	ldy	ecount	 	; get index
-	beq	L9	 	; jump if done
-	dey
-	lda	efunc,y
-   	sta	jmpvec+2
-   	dey
-   	lda	efunc,y
-     	sta	jmpvec+1
-   	sty	ecount
-	ldy	#0 		; number of function parms
-	jsr	jmpvec
-	jmp	doatexit     	; next one
-
-L9:	rts
-
+.endproc
 
 
 

libsrc/common/doatexit.s

@@ -0,0 +1,38 @@
+;
+; Ullrich von Bassewitz, 26.10.2000
+;
+; Handle exit functions
+;
+
+      	.export	       	doatexit, exitfunc_index, exitfunc_table
+       	.exportzp      	exitfunc_max
+ 	.import	 	jmpvec
+
+.bss
+exitfunc_index:	.res	1	; Index into table, inc'ed by 2
+exitfunc_table:	.res	10	; 5 exit functions
+exitfunc_max	= <(* - exitfunc_table)
+
+
+.code
+
+.proc	doatexit
+
+       	ldy    	exitfunc_index		; Get index
+       	beq    	@L9	 		; Jump if done
+ 	dey
+ 	lda	exitfunc_table,y
+   	sta	jmpvec+2
+   	dey
+   	lda	exitfunc_table,y
+     	sta	jmpvec+1
+   	sty	exitfunc_index
+ 	jsr	jmpvec			; Call the function
+ 	jmp	doatexit     		; Next one
+
+@L9:	rts
+
+.endproc
+
+
+