[xen staging] tools: add sizeof_field and endof_field macros

[patchbot@xxxxxxx]

commit 17e66ca9188b423eee35e6b4bf878e62d3879a04
Author:     Petr Beneš <w1benny@xxxxxxxxx>
AuthorDate: Wed Aug 27 10:28:44 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Aug 27 11:26:33 2025 +0200

    tools: add sizeof_field and endof_field macros
    
    * `sizeof_field` returns the size of a specific struct member
    * `endof_field` returns the offset to the end of the member within the 
struct
    
    It will be useful in upcoming layout checks of SMBIOS structs.
    
    Signed-off-by: Petr Beneš <w1benny@xxxxxxxxx>
    Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/include/xen-tools/common-macros.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/include/xen-tools/common-macros.h 
b/tools/include/xen-tools/common-macros.h
index 0088208c2e..9838a108aa 100644
--- a/tools/include/xen-tools/common-macros.h
+++ b/tools/include/xen-tools/common-macros.h
@@ -83,6 +83,11 @@
 #define __packed __attribute__((__packed__))
 #endif
 
+#define sizeof_field(type, member) sizeof(((type *)NULL)->member)
+
+#define endof_field(type, member) \
+    (offsetof(type, member) + sizeof_field(type, member))
+
 #define container_of(ptr, type, member) ({              \
     typeof(((type *)0)->member) *mptr__ = (ptr);        \
     (type *)((char *)mptr__ - offsetof(type, member));  \
--
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