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MINOR: lists: add LIST_ADDED() to check if an element belongs to a list

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Some code parts use LIST_ISEMPTY() a lot on list elements to detect
if they were reset consecutive to their removal from a list, but this
test is always confusing as this was initially designed for list heads.

Instead let's have a new macro, LIST_ADDED(), which returns true when
the element is in a list (i.e. it's not "empty").
This commit is contained in:
Willy Tarreau 2019-05-13 17:48:46 +02:00
parent 478281f55d
commit 42ccb5ac45
1 changed files with 5 additions and 0 deletions
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5
include/common/mini-clist.h
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@ -111,6 +111,11 @@ struct cond_wordlist {
/* checks if the list head <lh> is empty or not */
#define LIST_ISEMPTY(lh) ((lh)->n == (lh))
/* checks if the list element <el> was added to a list or not. This only
* works when detached elements are reinitialized (using LIST_DEL_INIT)
*/
#define LIST_ADDED(el) ((el)->n != (el))
/* returns a pointer of type <pt> to a structure following the element
* which contains list head <lh>, which is known as element <el> in
* struct pt.