flight/pios/inc/pios_struct_helper.h

   1 /* Taken from include/linux/kernel.h from the Linux kernel tree */
   2
   3 /**
   4  * container_of - cast a member of a structure out to the containing structure
   5  * @ptr:        the pointer to the member.
   6  * @type:       the type of the container struct this is embedded in.
   7  * @member:     the name of the member within the struct.
   8  *
   9  */
  10
  11 #ifndef PIOS_STRUCT_HELPER_H
  12 #define PIOS_STRUCT_HELPER_H
  13
  14 #define container_of(ptr, type, member) \
  15     ({                      \
  16          const typeof(((type *)0)->member) * __mptr = (ptr);    \
  17          (type *)((char *)__mptr - offsetof(type, member)); } \
  18     )
  19
  20 /**
  21  * cast_struct_to_array casts an homogeneous structure instance to an array
  22  * of typeof(struct_field). struct_field need to be any of the fields
  23  * containing inside the struct
  24  * @instance: homogeneous structure to cast
  25  * @struct_field: a field contained inside the structure
  26  */
  27 #define cast_struct_to_array(instance, struct_field) \
  28     ((typeof(struct_field) *) & (instance))
  29 #endif /* PIOS_STRUCT_HELPER_H */