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inline | side by side (from parent 1:
2eff9a6)
It's convenient to check that the member is the given type, but we can leave
that to the callers.
#define container_of(member_ptr, containing_type, member) \
((containing_type *) \
((char *)(member_ptr) \
#define container_of(member_ptr, containing_type, member) \
((containing_type *) \
((char *)(member_ptr) \
- - container_off((member_ptr), containing_type, member)))
+ - container_off(containing_type, member)) \
+ + check_types_match(*(member_ptr), ((containing_type *)0)->member))
/**
* container_off - get offset to enclosing structure
/**
* container_off - get offset to enclosing structure
- * @member_ptr: pointer to the structure member
* @containing_type: the type this member is within
* @member: the name of this member within the structure.
*
* Given a pointer to a member of a structure, this macro does
* typechecking and figures out the offset to the enclosing type.
*
* @containing_type: the type this member is within
* @member: the name of this member within the structure.
*
* Given a pointer to a member of a structure, this macro does
* typechecking and figures out the offset to the enclosing type.
*
- * Note that @member_ptr is not evaluated.
- *
* Example:
* struct foo {
* int fielda, fieldb;
* Example:
* struct foo {
* int fielda, fieldb;
*
* static struct info *foo_to_info(struct foo *foo)
* {
*
* static struct info *foo_to_info(struct foo *foo)
* {
- * size_t off = container_off(foo, struct info, my_foo);
+ * size_t off = container_off(struct info, my_foo);
* return (void *)((char *)foo - off);
* }
*/
* return (void *)((char *)foo - off);
* }
*/
-#define container_off(member_ptr, containing_type, member) \
- (offsetof(containing_type, member) \
- + check_types_match(*(member_ptr), ((containing_type *)0)->member))
+#define container_off(containing_type, member) \
+ offsetof(containing_type, member)
/**
* container_of_var - get pointer to enclosing structure using a variable
* @member_ptr: pointer to the structure member
/**
* container_of_var - get pointer to enclosing structure using a variable
* @member_ptr: pointer to the structure member
- * @var: a pointer to a structure of same type as this member is within
+ * @container_var: a pointer of same type as this member's container
* @member: the name of this member within the structure.
*
* Given a pointer to a member of a structure, this macro does pointer
* @member: the name of this member within the structure.
*
* Given a pointer to a member of a structure, this macro does pointer
-#define container_of_var(member_ptr, var, member) \
- container_of(member_ptr, typeof(*var), member)
+#define container_of_var(member_ptr, container_var, member) \
+ container_of(member_ptr, typeof(*container_var), member)
-#define container_of_var(member_ptr, var, member) \
- ((void *)((char *)(member_ptr) \
- - ((char *)&(var)->member - (char *)(var))))
+#define container_of_var(member_ptr, container_var, member) \
+ ((void *)((char *)(member_ptr) \
+ - ((char *)&(container_var)->member \
+ - (char *)(container_var))))
#endif
#endif /* CCAN_CONTAINER_OF_H */
#endif
#endif /* CCAN_CONTAINER_OF_H */
ok1(container_of_var(intp, &foo, a) == &foo);
ok1(container_of_var(charp, &foo, b) == &foo);
ok1(container_of_var(intp, &foo, a) == &foo);
ok1(container_of_var(charp, &foo, b) == &foo);
- ok1(container_off(intp, struct foo, a) == 0);
- ok1(container_off(charp, struct foo, b) == offsetof(struct foo, b));
+ ok1(container_off(struct foo, a) == 0);
+ ok1(container_off(struct foo, b) == offsetof(struct foo, b));
#include <stdbool.h>
#include <assert.h>
#include <ccan/container_of/container_of.h>
#include <stdbool.h>
#include <assert.h>
#include <ccan/container_of/container_of.h>
+#include <ccan/check_type/check_type.h>
/**
* struct list_node - an entry in a doubly-linked list
/**
* struct list_node - an entry in a doubly-linked list
* first = list_top(&parent->children, struct child, list);
*/
#define list_top(h, type, member) \
* first = list_top(&parent->children, struct child, list);
*/
#define list_top(h, type, member) \
- ((type *)list_top_((h), container_off((h)->n.next, type, member)))
+ ((type *)list_top_((h), list_off_(type, member)))
static inline const void *list_top_(const struct list_head *h, size_t off)
{
static inline const void *list_top_(const struct list_head *h, size_t off)
{
* last = list_tail(&parent->children, struct child, list);
*/
#define list_tail(h, type, member) \
* last = list_tail(&parent->children, struct child, list);
*/
#define list_tail(h, type, member) \
- ((type *)list_tail_((h), container_off((h)->n.next, type, member)))
+ ((type *)list_tail_((h), list_off_(type, member)))
static inline const void *list_tail_(const struct list_head *h, size_t off)
{
static inline const void *list_tail_(const struct list_head *h, size_t off)
{
nxt = container_of_var(i->member.next, i, member); \
&i->member != &(h)->n; \
i = nxt, nxt = container_of_var(i->member.next, i, member))
nxt = container_of_var(i->member.next, i, member); \
&i->member != &(h)->n; \
i = nxt, nxt = container_of_var(i->member.next, i, member))
+
+/* Get the offset of the member, but make sure it's a list_node. */
+#define list_off_(type, member) \
+ (container_off(type, member) + \
+ check_type(((type *)0)->member, struct list_node))
+