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Add ISC_LIST_FOREACH(_SAFE) macros

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There's a recurring pattern walking the ISC_LISTs that just repeats over
and over.  Add two macros:

 * ISC_LIST_FOREACH(list, elt, link) - walk the static list
 * ISC_LIST_FOREACH_SAFE(list, elt, link, next) - walk the list in
   a manner that's safe against list member deletions
This commit is contained in:
Ondřej Surý 2023-04-24 12:40:33 +02:00
parent f0c3881a82
commit ae997d9e21
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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' ]
ForEachMacros: [ 'cds_lfs_for_each', 'cds_lfs_for_each_safe', 'cds_list_for_each_entry_safe', 'ISC_LIST_FOREACH', 'ISC_LIST_FOREACH_SAFE' ]

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

@ -227,3 +227,17 @@
INSIST(ISC_LIST_EMPTY(dest)); \
ISC_LIST_MOVEUNSAFE(dest, src); \
}
/* clang-format off */
#define ISC_LIST_FOREACH(list, elt, link) \
for (elt = ISC_LIST_HEAD(list); \
elt != NULL; \
elt = ISC_LIST_NEXT(elt, link))
/* clang-format on */
/* clang-format off */
#define ISC_LIST_FOREACH_SAFE(list, elt, link, next) \
for (elt = ISC_LIST_HEAD(list), next = (elt != NULL) ? ISC_LIST_NEXT(elt, link) : NULL; \
elt != NULL; \
elt = next, next = (elt != NULL) ? ISC_LIST_NEXT(elt, link) : NULL)
/* clang-format on */