ProDOS 8 requires an page-aligned 1kB IO-buffer for every open file. The implementation using posix_memalign() is universally correct but quite expensive. There I added support for overriding this implementation with maybe limited (i.e. to one open file) but cheaper custom implementations.

git-svn-id: svn://svn.cc65.org/cc65/trunk@4142 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/apple2/Makefile

@@ -78,6 +78,7 @@ S_OBJS=	_scrsize.o	\
 	gotoy.o		\
         home.o          \
 	initcwd.o	\
+	iobuf.o         \
         joy_stddrv.o    \
      	kbhit.o		\
         mainargs.o      \

libsrc/apple2/iobuf.s

@@ -0,0 +1,15 @@
+;
+; Oliver Schmidt, 10.9.2009
+;
+; Default ProDOS 8 I/O buffer management
+; 
+
+        .export		iobuf_alloc, iobuf_free
+        .export		iobuf_init,  iobuf_done
+        .import		iobuf_nop
+        .import		_posix_memalign, _free
+
+iobuf_alloc := _posix_memalign
+iobuf_free  := _free
+iobuf_init  := iobuf_nop
+iobuf_done  := iobuf_nop

libsrc/apple2/mli.s

@@ -5,6 +5,8 @@
 ;
 
         .import         __dos_type
+        .import         iobuf_init, iobuf_done
+        .export         iobuf_nop
 
         .include        "mli.inc"
 
@@ -24,12 +26,16 @@ callmli:
         beq     oserr
 
         ; Call MLI and return
+        jsr     iobuf_init
         jsr     ENTRY
 call:   .byte   $00
         .addr   mliparam
-        rts
+        jmp     iobuf_done
 
         ; Load oserror code and return
 oserr:  lda     #$01		; "Invalid MLI function code number"
         sec
-        rts
+        ; Fall through
+
+iobuf_nop:
+        rts

libsrc/apple2/open.s

@@ -12,7 +12,7 @@
 
         .import		pushname, popname
         .import 	errnoexit, oserrexit
-        .import		_posix_memalign, _free
+        .import		iobuf_alloc, iobuf_free
         .import 	addysp, incsp4, incaxy, pushax, popax
 
         .include	"zeropage.inc"
@@ -70,7 +70,7 @@ found:  tya
         ldx	#>$0100
         jsr	pushax		; Preserves A
         ldx	#>$0400
-        jsr	_posix_memalign
+        jsr	iobuf_alloc
 	tay			; Save errno code
 
         ; Restore fdtab slot
@@ -206,7 +206,7 @@ freebuffer:
         ; Free I/O buffer
         lda	#$00
         ldx	fdtab + FD::BUFFER+1,y
-        jmp	_free
+        jmp	iobuf_free
 
 closeallfiles:
         ; All open files

libsrc/apple2enh/Makefile

@@ -78,6 +78,7 @@ S_OBJS=	_scrsize.o	\
 	gotoy.o		\
         home.o          \
 	initcwd.o	\
+	iobuf.o         \
         joy_stddrv.o    \
      	kbhit.o		\
         mainargs.o      \