Changeset 107091 in vbox for trunk/include

Timestamp:

Nov 21, 2024 4:12:02 PM (6 months ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

166049

Message:

iprt/cdefs.h,SUPDrvIOC.h,VBoxGuestR0Lib: Added a RT_UOFFSETOF_FLEX_ARRAY macro for calculating the size of structures ending with an variables length arrays. Only tested on windows... bugref:10585

File:

• trunk/include/iprt/cdefs.h (modified) (2 diffs)

trunk/include/iprt/cdefs.h

@@ -2978 +2978 @@
  * @param   type        Structure type.
  * @param   memberarray Member.
+ * @deprecated Use RT_UOFFSETOF_FLEX_ARRAY when possible.
  */
 #if defined(__cplusplus) && RT_GNUC_PREREQ(4, 4)
@@ -2984 +2985 @@
 # define RT_UOFFSETOF_DYN(type, memberarray)    ( (uintptr_t)&( ((type *)(void *)0)->memberarray) )
 #endif
+
+/** @def RT_UOFFSETOF_FLEX_ARRAY
+ * Calculates the size of a structure that ends with a flexible array.
+ *
+ * @returns offset into the structure of the specified member. signed.
+ * @param   a_Type          Structure type.
+ * @param   a_ArrayMember   The name of flexible array member.
+ * @param   a_cEntries      The number of array entries to include in the
+ *                          offset.
+ */
+#define RT_UOFFSETOF_FLEX_ARRAY(a_Type, a_ArrayMember, a_cEntries) \
+        ( RT_UOFFSETOF(a_Type, a_ArrayMember) + RT_SIZEOFMEMB(a_Type, a_ArrayMember[0]) * (a_cEntries) )