list.h: Add iterator macros

Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from #22674)
openssl · Dec 21, 2023 · 70a7e54 · 70a7e54
1 parent 3f0be2c
commit 70a7e54
Showing 1 changed file with 28 additions and 0 deletions.
diff --git a/include/internal/list.h b/include/internal/list.h
@@ -20,6 +20,34 @@
 #  define OSSL_LIST_DBG(x) x;
 # endif
 
+# define LIST_FOREACH_FROM(p, name, init)                                   \
+    for ((p) = (init);                                                      \
+         (p) != NULL;                                                       \
+         (p) = ossl_list_##name##_next(p))
+# define LIST_FOREACH(p, name, l)                                           \
+    LIST_FOREACH_FROM(p, name, ossl_list_##name##_head(l))
+
+# define LIST_FOREACH_REV_FROM(p, name, init)                               \
+    for ((p) = (init);                                                      \
+         (p) != NULL;                                                       \
+         (p) = ossl_list_##name##_prev(p))
+# define LIST_FOREACH_REV(p, name, l)                                       \
+    LIST_FOREACH_FROM(p, name, ossl_list_##name##_tail(l))
+
+# define LIST_FOREACH_DELSAFE_FROM(p, pn, name, init)                       \
+    for ((p) = (init);                                                      \
+         (p) != NULL && (((pn) = ossl_list_##name##_next(p)), 1);           \
+         (p) = (pn))
+#define LIST_FOREACH_DELSAFE(p, pn, name, l)                                \
+    LIST_FOREACH_DELSAFE_FROM(p, pn, name, ossl_list_##name##_head(l))
+
+# define LIST_FOREACH_REV_DELSAFE_FROM(p, pn, name, init)                   \
+    for ((p) = (init);                                                      \
+         (p) != NULL && (((pn) = ossl_list_##name##_prev(p)), 1);           \
+         (p) = (pn))
+# define LIST_FOREACH_REV_DELSAFE(p, pn, name, l)                           \
+    LIST_FOREACH_REV_DELSAFE_FROM(p, pn, name, ossl_list_##name##_tail(l))
+
 /* Define a list structure */
 # define OSSL_LIST(name) OSSL_LIST_ ## name