dlls/kernel32/task.c -- minor improvement

[Gerald Pfeifer]

On Fri, 4 Jan 2008, Alexandre Julliard wrote:
>> -    WORD  thunks[4];  /* Each thunk is 4 words long */
>> +    WORD  thunks[];   /* Each thunk is 4 words long */
> That syntax is not portable.

That depends. ;-)  You're right, it is not ISO C90, but it is in the
C99 standard which is now close to ten years old.

  % gcc -pedantic x.c -c -o x -std=c99
  % gcc -pedantic x.c -c -o x -std=c89
  x.c:3: warning: ISO C90 does not support flexible array members
  % gcc -pedantic x.c -c -o x
  x.c:3: warning: ISO C90 does not support flexible array members

Which compiler that we care about doesn't support this C99 feature?

That said, if you don't want to take the original patch, can we take
the one below?

Thanks,
Gerald

ChangeLog:
Use 4*sizeof(WORD) instead of the magic constant 8 for THUNKS.thunks,
and explain why we cannot use an open array type THUNKS.thunks[].

Index: dlls/kernel32/task.c
===================================================================
RCS file: /home/wine/wine/dlls/kernel32/task.c,v
retrieving revision 1.2
diff -u -3 -p -r1.2 task.c
--- dlls/kernel32/task.c	13 Oct 2006 10:27:19 -0000	1.2
+++ dlls/kernel32/task.c	6 Jan 2008 12:26:32 -0000
@@ -57,7 +57,10 @@ typedef struct
     WORD  magic;      /* Thunks signature */
     WORD  unused;
     WORD  free;       /* Head of the free list */
-    WORD  thunks[4];  /* Each thunk is 4 words long */
+    WORD  thunks[4];  /* Each thunk is 4 words long, and while we will
+                       * dynamically allocate the whole struct according
+                       * to the actual number of thunks we cannot use the
+                       * thunks[] syntax here because it is not C90. */
 } THUNKS;
 
 #include "poppack.h"
@@ -174,7 +177,7 @@ static void TASK_CreateThunks( HGLOBAL16
     free = pThunk->free;
     for (i = 0; i < count-1; i++)
     {
-        free += 8;  /* Offset of next thunk */
+        free += 4*sizeof(WORD);  /* Offset of next thunk */
         pThunk->thunks[4*i] = free;
     }
     pThunk->thunks[4*i] = 0;  /* Last thunk */
@@ -201,7 +204,8 @@ static SEGPTR TASK_AllocThunk(void)
         sel = pThunk->next;
         if (!sel)  /* Allocate a new segment */
         {
-            sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
+            sel = GLOBAL_Alloc( GMEM_FIXED,
+                                sizeof(THUNKS) + (MIN_THUNKS-1)*4*sizeof(WORD),
                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
             if (!sel) return (SEGPTR)0;
             TASK_CreateThunks( sel, 0, MIN_THUNKS );