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more refinements

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This commit is contained in:
Alasdair Kergon 2005-04-06 15:21:28 +00:00
parent 1128f56b1e
commit 06cc0dade2
2 changed files with 20 additions and 18 deletions
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19
lib/datastruct/list.h
View File

@ -120,11 +120,11 @@ static inline struct list *list_next(struct list *head, struct list *elem)
} }
/* /*
* Given the address v of an instance of 'struct list h' contained in * Given the address v of an instance of 'struct list' called 'head'
* a structure of type t, return the containing structure. * contained in a structure of type t, return the containing structure.
*/ */
#define list_struct_base(v, t, h) \ #define list_struct_base(v, t, head) \
((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->h)) ((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->head))
/* /*
* Given the address v of an instance of 'struct list list' contained in * Given the address v of an instance of 'struct list list' contained in
@ -172,18 +172,19 @@ static inline struct list *list_next(struct list *head, struct list *elem)
/* /*
* Walk a list, setting 'v' in turn to the containing structure of each item. * Walk a list, setting 'v' in turn to the containing structure of each item.
* The containing structure should be the same type as 'v'. * The containing structure should be the same type as 'v'.
* The 'struct list' variable within the containing structure is 'l'. * The 'struct list' variable within the containing structure is 'field'.
*/ */
#define list_iterate_items_head(v, head, l) \ #define list_iterate_items_gen(v, head, field) \
for (v = list_struct_base((head)->n, typeof(*v), l); &v->l != (head); \ for (v = list_struct_base((head)->n, typeof(*v), field); \
v = list_struct_base(v->l.n, typeof(*v), l)) &v->field != (head); \
v = list_struct_base(v->field.n, typeof(*v), field))
/* /*
* Walk a list, setting 'v' in turn to the containing structure of each item. * Walk a list, setting 'v' in turn to the containing structure of each item.
* The containing structure should be the same type as 'v'. * The containing structure should be the same type as 'v'.
* The list should be 'struct list list' within the containing structure. * The list should be 'struct list list' within the containing structure.
*/ */
#define list_iterate_items(v, head) list_iterate_items_head(v, (head), list) #define list_iterate_items(v, head) list_iterate_items_gen(v, (head), list)
/* /*
* Return the number of elements in a list by walking it. * Return the number of elements in a list by walking it.

19
libdm/datastruct/list.h
View File

@ -120,11 +120,11 @@ static inline struct list *list_next(struct list *head, struct list *elem)
} }
/* /*
* Given the address v of an instance of 'struct list h' contained in * Given the address v of an instance of 'struct list' called 'head'
* a structure of type t, return the containing structure. * contained in a structure of type t, return the containing structure.
*/ */
#define list_struct_base(v, t, h) \ #define list_struct_base(v, t, head) \
((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->h)) ((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->head))
/* /*
* Given the address v of an instance of 'struct list list' contained in * Given the address v of an instance of 'struct list list' contained in
@ -172,18 +172,19 @@ static inline struct list *list_next(struct list *head, struct list *elem)
/* /*
* Walk a list, setting 'v' in turn to the containing structure of each item. * Walk a list, setting 'v' in turn to the containing structure of each item.
* The containing structure should be the same type as 'v'. * The containing structure should be the same type as 'v'.
* The 'struct list' variable within the containing structure is 'l'. * The 'struct list' variable within the containing structure is 'field'.
*/ */
#define list_iterate_items_head(v, head, l) \ #define list_iterate_items_gen(v, head, field) \
for (v = list_struct_base((head)->n, typeof(*v), l); &v->l != (head); \ for (v = list_struct_base((head)->n, typeof(*v), field); \
v = list_struct_base(v->l.n, typeof(*v), l)) &v->field != (head); \
v = list_struct_base(v->field.n, typeof(*v), field))
/* /*
* Walk a list, setting 'v' in turn to the containing structure of each item. * Walk a list, setting 'v' in turn to the containing structure of each item.
* The containing structure should be the same type as 'v'. * The containing structure should be the same type as 'v'.
* The list should be 'struct list list' within the containing structure. * The list should be 'struct list list' within the containing structure.
*/ */
#define list_iterate_items(v, head) list_iterate_items_head(v, (head), list) #define list_iterate_items(v, head) list_iterate_items_gen(v, (head), list)
/* /*
* Return the number of elements in a list by walking it. * Return the number of elements in a list by walking it.