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-rw-r--r--plugins/vcgn-plugin/vcgn/index_list.h118
1 files changed, 118 insertions, 0 deletions
diff --git a/plugins/vcgn-plugin/vcgn/index_list.h b/plugins/vcgn-plugin/vcgn/index_list.h
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+/*
+ *------------------------------------------------------------------
+ * index_list.h - vector-index-based doubly-linked lists
+ *
+ * Copyright (c) 2008-2009 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#ifndef _INDEX_LIST_H_
+#define _INDEX_LIST_H_ 1
+
+/* An index we can't possibly see in practice... */
+#define EMPTY ((u32)~0)
+
+typedef struct index_slist_ {
+ u32 next;
+} index_slist_t;
+
+/*
+ * index_slist_addhead
+ *
+ * args: headp -- pointer to e.g. a hash bucket
+ * vector -- vector containing the list
+ * elsize -- size of an element in this vector
+ * offset -- offset in each vector element of this list thread
+ * index_to_add -- index in the vector to add to the list
+ *
+ * Adds new items to the head of the list. Try not to screw up the args!
+ */
+static inline void
+ index_slist_addhead_inline (index_slist_t *headp,
+ u8 *vector, u32 elsize,
+ u32 offset, u32 index_to_add)
+{
+ index_slist_t *addme;
+
+ addme = (index_slist_t *)(vector + offset + elsize*index_to_add);
+ addme->next = EMPTY;
+
+ if (headp->next == EMPTY) {
+ headp->next = index_to_add;
+ return;
+ } else {
+ addme->next = headp->next;
+ headp->next = index_to_add;
+ }
+}
+
+/*
+ * index_slist_remelem
+ *
+ * args: headp -- pointer to e.g. a hash bucket
+ * vector -- vector containing the list
+ * elsize -- size of an element in this vector
+ * offset -- offset in each vector element of this list thread
+ * index_to_del -- index in the vector to delete from the list
+ *
+ * Try not to screw up the args!
+ */
+
+static inline int
+ index_slist_remelem_inline (index_slist_t *headp,
+ u8 *vector, u32 elsize,
+ u32 offset, u32 index_to_delete)
+{
+ index_slist_t *findme;
+ index_slist_t *prev;
+ index_slist_t *cur;
+
+ findme = (index_slist_t *)(vector + offset + elsize*index_to_delete);
+
+ if (headp->next == index_to_delete) {
+ headp->next = findme->next;
+ findme->next = EMPTY;
+ return 0;
+ }
+
+ prev = (index_slist_t *)(vector + offset + elsize*headp->next);
+ cur = (index_slist_t *)(vector + offset + elsize*prev->next);
+ while (cur != findme) {
+ if (cur->next == EMPTY)
+ return (1);
+ prev = cur;
+ cur = (index_slist_t *)(vector + offset + elsize*cur->next);
+ }
+ prev->next = findme->next;
+ findme->next = EMPTY;
+ return 0;
+}
+
+void index_slist_addhead (index_slist_t *headp,
+ u8 *vector, u32 elsize, u32 offset, u32 index);
+int index_slist_remelem (index_slist_t *headp,
+ u8 *vector, u32 elsize, u32 offset, u32 index);
+
+typedef struct index_dlist_ {
+ u32 next;
+ u32 prev;
+} index_dlist_t;
+
+void index_dlist_addtail (u32 head_index, u8 *vector, u32 elsize,
+ u32 offset, u32 index_to_add);
+
+u32 index_dlist_remelem (u32 head_index,
+ u8 *vector, u32 elsize, u32 offset,
+ u32 index_to_delete);
+#endif /* _INDEX_LIST_H_ */