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Add ISC_LIST_FOREACH_REV(_SAFE) macros

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Add complementary macros to ISC_LIST_FOREACH(_SAFE) that walk the lists
in reverse.

  * ISC_LIST_FOREACH_REV(list, elt, link) - walk the static list from
    tail to head
  * ISC_LIST_FOREACH_REV_SAFE(list, elt, link, next) - walk the list
    from tail to head in a manner that's safe against list member
    deletions
This commit is contained in:
Ondřej Surý 2023-10-19 10:21:20 +02:00
parent fd732a7fb5
commit d2e84a4b97
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GPG Key ID: 2820F37E873DEA41
2 changed files with 15 additions and 1 deletions
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2
.clang-format
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@ -78,4 +78,4 @@ PenaltyBreakString: 80
PenaltyExcessCharacter: 100
Standard: Cpp11
ContinuationIndentWidth: 8
ForEachMacros: [ 'cds_lfs_for_each', 'cds_lfs_for_each_safe', 'cds_list_for_each_entry_safe', 'ISC_LIST_FOREACH', 'ISC_LIST_FOREACH_SAFE' ]
ForEachMacros: [ 'cds_lfs_for_each', 'cds_lfs_for_each_safe', 'cds_list_for_each_entry_safe', 'ISC_LIST_FOREACH', 'ISC_LIST_FOREACH_SAFE', 'ISC_LIST_FOREACH_REV', 'ISC_LIST_FOREACH_REV_SAFE' ]

14
lib/isc/include/isc/list.h
View File

@ -241,3 +241,17 @@
elt != NULL; \
elt = next, next = (elt != NULL) ? ISC_LIST_NEXT(elt, link) : NULL)
/* clang-format on */
/* clang-format off */
#define ISC_LIST_FOREACH_REV(list, elt, link) \
for (elt = ISC_LIST_TAIL(list); \
elt != NULL; \
elt = ISC_LIST_PREV(elt, link))
/* clang-format on */
/* clang-format off */
#define ISC_LIST_FOREACH_REV_SAFE(list, elt, link, prev) \
for (elt = ISC_LIST_TAIL(list), prev = (elt != NULL) ? ISC_LIST_PREV(elt, link) : NULL; \
elt != NULL; \
elt = prev, prev = (elt != NULL) ? ISC_LIST_PREV(elt, link) : NULL)
/* clang-format on */