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+/**
+ * Copyright (c) 2013-2021 UChicago Argonne, LLC and The HDF Group.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* Code below is derived from sys/queue.h which follows the below notice:
+ *
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)queue.h 8.5 (Berkeley) 8/20/94
+ */
+
+#ifndef MERCURY_LIST_H
+#define MERCURY_LIST_H
+
+#define HG_LIST_HEAD_INITIALIZER(name) \
+ { \
+ NULL \
+ }
+
+#define HG_LIST_HEAD_INIT(struct_head_name, var_name) \
+ struct struct_head_name var_name = HG_LIST_HEAD_INITIALIZER(var_name)
+
+#define HG_LIST_HEAD_DECL(struct_head_name, struct_entry_name) \
+ struct struct_head_name { \
+ struct struct_entry_name *head; \
+ }
+
+#define HG_LIST_HEAD(struct_entry_name) \
+ struct { \
+ struct struct_entry_name *head; \
+ }
+
+#define HG_LIST_ENTRY(struct_entry_name) \
+ struct { \
+ struct struct_entry_name * next; \
+ struct struct_entry_name **prev; \
+ }
+
+#define HG_LIST_INIT(head_ptr) \
+ do { \
+ (head_ptr)->head = NULL; \
+ } while (/*CONSTCOND*/ 0)
+
+#define HG_LIST_IS_EMPTY(head_ptr) ((head_ptr)->head == NULL)
+
+#define HG_LIST_FIRST(head_ptr) ((head_ptr)->head)
+
+#define HG_LIST_NEXT(entry_ptr, entry_field_name) ((entry_ptr)->entry_field_name.next)
+
+#define HG_LIST_INSERT_AFTER(list_entry_ptr, entry_ptr, entry_field_name) \
+ do { \
+ if (((entry_ptr)->entry_field_name.next = (list_entry_ptr)->entry_field_name.next) != NULL) \
+ (list_entry_ptr)->entry_field_name.next->entry_field_name.prev = \
+ &(entry_ptr)->entry_field_name.next; \
+ (list_entry_ptr)->entry_field_name.next = (entry_ptr); \
+ (entry_ptr)->entry_field_name.prev = &(list_entry_ptr)->entry_field_name.next; \
+ } while (/*CONSTCOND*/ 0)
+
+#define HG_LIST_INSERT_BEFORE(list_entry_ptr, entry_ptr, entry_field_name) \
+ do { \
+ (entry_ptr)->entry_field_name.prev = (list_entry_ptr)->entry_field_name.prev; \
+ (entry_ptr)->entry_field_name.next = (list_entry_ptr); \
+ *(list_entry_ptr)->entry_field_name.prev = (entry_ptr); \
+ (list_entry_ptr)->entry_field_name.prev = &(entry_ptr)->entry_field_name.next; \
+ } while (/*CONSTCOND*/ 0)
+
+#define HG_LIST_INSERT_HEAD(head_ptr, entry_ptr, entry_field_name) \
+ do { \
+ if (((entry_ptr)->entry_field_name.next = (head_ptr)->head) != NULL) \
+ (head_ptr)->head->entry_field_name.prev = &(entry_ptr)->entry_field_name.next; \
+ (head_ptr)->head = (entry_ptr); \
+ (entry_ptr)->entry_field_name.prev = &(head_ptr)->head; \
+ } while (/*CONSTCOND*/ 0)
+
+/* TODO would be nice to not have any condition */
+#define HG_LIST_REMOVE(entry_ptr, entry_field_name) \
+ do { \
+ if ((entry_ptr)->entry_field_name.next != NULL) \
+ (entry_ptr)->entry_field_name.next->entry_field_name.prev = (entry_ptr)->entry_field_name.prev; \
+ *(entry_ptr)->entry_field_name.prev = (entry_ptr)->entry_field_name.next; \
+ } while (/*CONSTCOND*/ 0)
+
+#define HG_LIST_FOREACH(var, head_ptr, entry_field_name) \
+ for ((var) = ((head_ptr)->head); (var); (var) = ((var)->entry_field_name.next))
+
+#endif /* MERCURY_LIST_H */