util: add fieldsizeof and fieldtypeof macros

Signed-off-by: Julien Danjou <julien@danjou.info>
2009-06-17 14:17:40 +02:00 · 2009-06-17 14:17:40 +02:00 · 654bfae6f7
parent d088b819f9
commit 654bfae6f7
1 changed files with 2 additions and 0 deletions
--- a/common/util.h
+++ b/common/util.h
@ -80,6 +80,8 @@ typedef struct

 #define ssizeof(foo)            (ssize_t)sizeof(foo)
 #define countof(foo)            (ssizeof(foo) / ssizeof(foo[0]))
+#define fieldsizeof(type_t, m)  sizeof(((type_t *)0)->m)
+#define fieldtypeof(type_t, m)  typeof(((type_t *)0)->m)

 #define p_alloca(type, count)                                \
        ((type *)memset(alloca(sizeof(type) * (count)),      \