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MINOR: list: add LIST_SPLICE() to merge one list into another

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This will move the contents of list <old> at the beginning of list
<new>.
This commit is contained in:
Willy Tarreau 2019-08-16 11:27:50 +02:00
parent 02bac85bee
commit 9bead8c7f5
1 changed files with 8 additions and 0 deletions
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8
include/common/mini-clist.h
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@ -86,6 +86,14 @@ struct cond_wordlist {
/* adds an element at the end of a list ; returns the element */ /* adds an element at the end of a list ; returns the element */
#define LIST_ADDQ(lh, el) ({ (el)->p = (lh)->p; (el)->p->n = (lh)->p = (el); (el)->n = (lh); (el); }) #define LIST_ADDQ(lh, el) ({ (el)->p = (lh)->p; (el)->p->n = (lh)->p = (el); (el)->n = (lh); (el); })
/* adds the contents of a list <old> at the beginning of another list <new>. The old list head remains untouched. */
#define LIST_SPLICE(new, old) do { \
if (!LIST_ISEMPTY(old)) { \
(old)->p->n = (new)->n; (old)->n->p = (new); \
(new)->n->p = (old)->p; (new)->n = (old)->n; \
} \
} while (0)
/* removes an element from a list and returns it */ /* removes an element from a list and returns it */
#define LIST_DEL(el) ({ typeof(el) __ret = (el); (el)->n->p = (el)->p; (el)->p->n = (el)->n; (__ret); }) #define LIST_DEL(el) ({ typeof(el) __ret = (el); (el)->n->p = (el)->p; (el)->p->n = (el)->n; (__ret); })