Getting rid of LOCAL_ exports

[Dimi Paun]

> From a cursory look at the problem, it seems we can turn things

upside down. Right now LOCAL_*() functions (Wine specific) are
equivalent to the Local*16() functions (Windows exports), with
the exception that they take a  selector as first argument 
(which makes them more general). As a result, Local*16() functions
are implemented on top of the LOCAL_*() ones.

This is only half of the story. In fact, the Local*16() functions
do take the segment as input, but in a more awkward manner:
as the value of the DS register. So we can actually implement
the LOCAL_*() functions on top of the Local*16() ones by messing
with the DS register. Doing so would hopefully get rid of the
LOCAL_*() exports from kernel.

I've taken a stab (prototype level) at the LOCAL_Alloc() function
(patch included below). Would such an approach be acceptable?

Index: include/local.h
===================================================================
RCS file: /var/cvs/wine/include/local.h,v
retrieving revision 1.6
diff -u -p -r1.6 local.h
--- include/local.h	28 Aug 2003 21:43:35 -0000	1.6
+++ include/local.h	10 May 2005 18:20:03 -0000
@@ -23,12 +23,22 @@

#include <windef.h>
 #include <wine/windef16.h>
+#include <stackframe.h>

/* These function are equivalent to the Local* API functions, */
   /* excepted that they need DS as the first parameter. This    */
   /* allows managing several heaps from the emulation library.  */
+static inline HLOCAL16 LOCAL_Alloc( HANDLE16 ds, UINT16 flags, WORD
size )
+{
+    HANDLE16 oldDS = CURRENT_DS;
+    HLOCAL16 ret;
+
+    CURRENT_DS = ds;
+    ret = LocalAlloc16 (flags, size);
+    CURRENT_DS = oldDS;
+    return ret;
+}

-extern HLOCAL16 LOCAL_Alloc( HANDLE16 ds, UINT16 flags, WORD size );
 extern HLOCAL16 LOCAL_ReAlloc( HANDLE16 ds, HLOCAL16 handle,
                                WORD size, UINT16 flags );
 extern HLOCAL16 LOCAL_Free( HANDLE16 ds, HLOCAL16 handle );
Index: dlls/kernel/kernel32.spec
===================================================================
RCS file: /var/cvs/wine/dlls/kernel/kernel32.spec,v
retrieving revision 1.148
diff -u -p -r1.148 kernel32.spec
--- dlls/kernel/kernel32.spec	10 May 2005 15:22:10 -0000	1.148
+++ dlls/kernel/kernel32.spec	10 May 2005 18:22:10 -0000
@@ -1167,7 +1167,6 @@
 # Wine dll separation hacks, these will go away, don't use them
 #
 @ cdecl DOSMEM_AllocSelector(long)
-@ cdecl LOCAL_Alloc(long long long)
 @ cdecl LOCAL_Compact(long long long)
 @ cdecl LOCAL_CountFree(long)
 @ cdecl LOCAL_Free(long long)
Index: dlls/kernel/local16.c
===================================================================
RCS file: /var/cvs/wine/dlls/kernel/local16.c,v
retrieving revision 1.10
diff -u -p -r1.10 local16.c
--- dlls/kernel/local16.c	24 Mar 2005 21:01:38 -0000	1.10
+++ dlls/kernel/local16.c	10 May 2005 17:56:15 -0000
@@ -1150,15 +1150,13 @@ HLOCAL16 LOCAL_Free( HANDLE16 ds, HLOCAL

/***********************************************************************
- *           LOCAL_Alloc
- *
- * Implementation of LocalAlloc().
- *
+ *           LocalAlloc   (KERNEL.5)
  */
-HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD flags, WORD size )
+HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
 {
+    HANDLE16 ds = CURRENT_DS;
+    HLOCAL16 handle = 0;
     char *ptr;
-    HLOCAL16 handle;

TRACE("%04x %d ds=%04x\n", flags, size, ds );

@@ -1171,7 +1169,7 @@ HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD 
    if(size)
    {
        if (!(hmem = LOCAL_GetBlock( ds, size + MOVEABLE_PREFIX, flags )))
-		return 0;
+		goto exit;
         }
    else /* We just need to allocate a discarded handle */
        hmem = 0;
@@ -1180,7 +1178,7 @@ HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD 
        WARN("Couldn't get handle.\n");
        if(hmem)
    	LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
-	    return 0;
+	    goto exit;
    }
    ptr = MapSL( MAKESEGPTR( ds, 0 ) );
    plhe = (LOCALHANDLEENTRY *)(ptr + handle);
@@ -1199,10 +1197,11 @@ HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD 
     }
     else /* FIXED */
     {
-	if(!size)
-	    return 0;
-	handle = LOCAL_GetBlock( ds, size, flags );
+	if(size) handle = LOCAL_GetBlock( ds, size, flags );
     }
+
+exit:
+    CURRENT_STACK16->ecx = handle;  /* must be returned in cx too */
     return handle;
 }

@@ -1595,17 +1594,6 @@ HLOCAL16 LOCAL_Handle( HANDLE16 ds, WORD

/***********************************************************************
- *           LocalAlloc   (KERNEL.5)
- */
-HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
-{
-    HLOCAL16 ret = LOCAL_Alloc( CURRENT_DS, flags, size );
-    CURRENT_STACK16->ecx = ret;  /* must be returned in cx too */
-    return ret;
-}
-
-
-/***********************************************************************
  *           LocalReAlloc   (KERNEL.6)
  */
 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16
flags )