[comctl32] Reduce memory usage of the syslink control (Take 4)

[Alexandre Julliard]

Thomas Weidenmueller <wine-patches at reactsoft.com> writes:

> @@ -1062,35 +1063,41 @@
>  
>      if(Item->mask & LIF_ITEMID)
>      {
> -        if(!di->u.Link.szID)
> +        if(di->u.Link.szID)
>          {
> -            di->u.Link.szID = Alloc((MAX_LINKID_TEXT + 1) * sizeof(WCHAR));
> -            if(!Item->szID)
> -            {
> -                ERR("Unable to allocate memory for link id\n");
> -                Ret = FALSE;
> -            }
> +            Free(di->u.Link.szID);
>          }
> +
> +        nc = min(lstrlenW(Item->szID), MAX_LINKID_TEXT - 1);
> +        di->u.Link.szID = Alloc((nc + 1) * sizeof(WCHAR));
>          if(di->u.Link.szID)
>          {
> -            lstrcpynW(di->u.Link.szID, Item->szID, MAX_LINKID_TEXT + 1);
> +            lstrcpynW(di->u.Link.szID, Item->szID, nc + 1);
> +        }
> +        else
> +        {
> +            ERR("Unable to allocate memory for link id\n");
> +            Ret = FALSE;
>          }
>      }

You should probably make sure that the new text has been allocated
properly before freeing the old one, so that allocation errors don't
cause the current contents to be lost.

-- 
Alexandre Julliard
julliard at winehq.org